Re: [Elecraft] CM500 headset on K3S and KX3?

[Bert]

I like 1/4 inch plugs too, but most rigs nowadays have 3.5mm jacks!
You can use an adapter, but that forfeits the purpose.

Bert VE3NR

On 5/9/2020 5:40 PM, Dick Dievendorff wrote:

This isn’t an endorsement from my company, but I’ve been real happy with my 
Inrad W1. It has a real 1/4 inch phone plug, robust and coiled cord longer than 
normal, it’s quite comfortable.  I have not used the microphone much, but it’s 
been fine.  Foam covered mike, easy to move out of the way.
Replacement ear pads, should I ever need them, are $10.

I find in longer contests that I like to change headsets to move the pressure 
points. So I have acquired several over the years. My old Sony MD-V is also a 
favorite for CW contests.

Dick, K6KR



On May 9, 2020, at 14:27, stephen shearer  wrote:

I purchased a Heil Prpset about the same time 2010+/- and they were leaving "black 
bits" around too.  Yes, the Heil is more expensive.  I was able to purchase new foam 
from the DC Store.  I searched HRO and they had stock, if you knew the part number.  I 
now have a new Headset...  I DO like the HC4 element and the cotton ear pads...
73, steve WB3LGC


On 5/6/20 12:53 PM, Walter Underwood wrote:
My CM500’s earpads are flaking pretty badly, leaving little back bits around 
the home office/shack. They still work fine.

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Re: [Elecraft] CM500 headset on K3S and KX3?

[Dick Dievendorff]

This isn’t an endorsement from my company, but I’ve been real happy with my 
Inrad W1. It has a real 1/4 inch phone plug, robust and coiled cord longer than 
normal, it’s quite comfortable.  I have not used the microphone much, but it’s 
been fine.  Foam covered mike, easy to move out of the way.
Replacement ear pads, should I ever need them, are $10.

I find in longer contests that I like to change headsets to move the pressure 
points. So I have acquired several over the years. My old Sony MD-V is also a 
favorite for CW contests.

Dick, K6KR


> On May 9, 2020, at 14:27, stephen shearer  wrote:
> 
> I purchased a Heil Prpset about the same time 2010+/- and they were leaving 
> "black bits" around too.  Yes, the Heil is more expensive.  I was able to 
> purchase new foam from the DC Store.  I searched HRO and they had stock, if 
> you knew the part number.  I now have a new Headset...  I DO like the HC4 
> element and the cotton ear pads...
> 73, steve WB3LGC
> 
>> On 5/6/20 12:53 PM, Walter Underwood wrote:
>> My CM500’s earpads are flaking pretty badly, leaving little back bits around 
>> the home office/shack. They still work fine.
> __
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Re: [Elecraft] CM500 headset on K3S and KX3?

[stephen shearer]

I purchased a Heil Prpset about the same time 2010+/- and they were 
leaving "black bits" around too.  Yes, the Heil is more expensive.  I 
was able to purchase new foam from the DC Store.  I searched HRO and 
they had stock, if you knew the part number.  I now have a new 
Headset...  I DO like the HC4 element and the cotton ear pads...

73, steve WB3LGC

On 5/6/20 12:53 PM, Walter Underwood wrote:
My CM500’s earpads are flaking pretty badly, leaving little back bits around the home office/shack. They still work fine. 

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Re: [Elecraft] CM500 headset on K3S and KX3?

[Bill Frantz]

I normally use a CM500.

OK, the RS60CF is a Radio Sport head set. :-)

I used one of their headsets during our club's CQP county 
expedition. I liked the isolation from ambient room noise. Yes, 
it squeezes your head, but I could wear it for several hours at 
a time without feeling I was getting close to the end of my tolerence.


I didn't use VOX at home in CA because my radio was set up in 
the family room with 20+ feet of space between the backs of the 
equipment and the front door. (Nice for moving wires.) My wife 
frequently would walk up to the radio and ask a question and I 
didn't want the answer going out on the air. :-)


I did use VOX when I did a multi-op WPX contest at K9YC's QTH. 
In that isolated environment it was more convenient than my 
footswitch at home. Doing the contest was also a whole lot of 
fun, and watching the other ops was a excellent learning experience.


What I'll end up doing here in NH is still up in the air.

73 Bill AE6JV

On 5/6/20 at 11:39 PM, j...@audiosystemsgroup.com (Jim Brown) wrote:


On 2020-05-06 1:16 PM, Grant Youngman wrote:


Replaced them eventually with an RS60CF, and never looked back.


On 5/6/2020 4:52 PM, Joe Subich, W4TV wrote:

A heavy, bulky, "head squeezer" for more than five times as much
as the CM500 ...


Yes. I tried them on when they first came out and found them to 
be an instrument of torture. Years later, after hearing guys 
rave about how comfy the were, I tried them on again, with the 
same result.


73, Jim K9YC


---
Bill Frantz| Truth and love must prevail  | Periwinkle
(408)348-7900  | over lies and hate.  | 150 
Rivermead Rd #235
www.pwpconsult.com |   - Vaclav Havel | 
Peterborough, NH 03458


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Re: [Elecraft] CM500 headset on K3S and KX3?

[Edward R Cole]

A couple years ago I bought the CM500 based on al the nice comments 
by others on this list.  They failed me terribly; set up howling like 
a banshee minute I put them on (over my hearing aids) and not even 
connected to the radio.  My hearing so poor that the amount of gain 
in my hearing aids fed back inside the acoustics of the 
ear-piece.  No amount of fiddling with the headset stopped the 
feedback, so went back to wearing my Sony MDR-V600 stereo headset 
(which work well with my hearing aids).  One if you bought the new 
CM500 from me for a nice discount, so I didn't loose out completely.


I got a lot of advice back then which did not help/fix the problem 
(not wearing the hearing aids and turning up radio volume was one).


In stead, I found a boom mic that attached to my Sony headset via an 
earth magnet "thingy" and that got FB audio reports.  The mic has a 
foam wind-blast reducer and selectable omni or cardiod pattern pick 
up.  Haven't really used the combo as I normally use my  Heil desk 
mic in the shack.  The boom mic was obtained for operating portable outdoors.


73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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Re: [Elecraft] CM500 headset on K3S and KX3?

[rich hurd WC3T]

Dekoni is the supplier.  eBay has them.   I bought two sets as I have an
MDR-V7 and an MDR-7506.   Looking to see if they have them for the Yamaha
now.

On Wed, May 6, 2020 at 1:33 PM Charlie T  wrote:

> If you can find them, "velour" pads are GREAT.
> Very comfortable, Softer and NO flaking.
> I replaced the pads on my Sony MDR-7506's with them.
> I especially like these Sony's since they have excellent high frequency
> response (better than the CM500's) which is perfect for my high freq
> hearing loss.
> Not sure if they'll fit, but somebody out there must make velour pads for
> the CM500's.
>
> 73, Charlie k3ICH
>
>
>
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> On Behalf Of Walter Underwood
> Sent: Wednesday, May 06, 2020 12:53 PM
> To: Elecraft Mailing List 
> Subject: Re: [Elecraft] CM500 headset on K3S and KX3?
>
> My CM500’s earpads are flaking pretty badly, leaving little back bits
> around the home office/shack. They still work fine. I purchased them in
> December 2012. I see that the same order has Eneloop XX batteries and a
> LowePro Edit 140 case, so that was all ordered to go with my brand-new KX3.
>
> Comments on my blog post suggested the Koss SB45 as another alternative.
> This also has an electret mic, but somewhat different fit over the ears,
> and it is cheaper.
>
>
> https://www.amazon.com/Koss-sb45-SB-45-Communication-Stereophones/dp/B00081A2CW
>
> Do not get the Koss SB40. That is the same headset as the Yamaha CM500,
> but with an inferior dynamic mic.
>
> The mic connector on my Yamaha CM500 is labeled “KOSS”, for what that’s
> worth. I noticed that when choosing photos for my blog post.
>
> It is normal for earpads to wear out. I replaced the pads on my Grado
> SR225e phones after five years.
>
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
>
> > On May 6, 2020, at 8:25 AM, N2TK via Elecraft 
> wrote:
> >
> > I bought replacement ear pad cushions and earpad covers for Koss UR20,
> headphones on eBay a while back for $14.24. They fit the CM500 fine. A pain
> to change but worth it.
> > I have had very good results with CM500. They fit my head better than
> the Heil's which were too tight. I would rather have a material cover which
> I find more comfortable for wearing for many hours in a contest. I use a
> quarter of a paper towel between the headset cushions and my ears. That
> works fine.
> > And the CM500's are so cheap I bought a spare, just in case.
> > N2TK, Tony
> >
> > -Original Message-
> > From: elecraft-boun...@mailman.qth.net
> >  On Behalf Of Wes
> > Sent: Tuesday, May 5, 2020 9:45 PM
> > To: elecraft@mailman.qth.net
> > Subject: Re: [Elecraft] CM500 headset on K3S and KX3?
> >
> > The failures I have are the ear pads disintegrate.  Someone said Koss
> pads could work but that hasn't been my experience. I've found some '500s
> at estate sales where I snap them up.  Currently the law firm where my
> fiance is employed is working from home and she's using a set on her
> computer to "attend" on-line meetings.  I guess I can add "IT Manager" to
> my resume, since I'm helping her with her connections.  I second the use of
> VOX.
> >
> > Wes  N7WS
> >
> > On 5/5/2020 5:32 PM, Jim Brown wrote:
> >> On 5/5/2020 4:44 PM, Paul Gacek via Elecraft wrote:
> >>> For what its worth and everyones milage will vary, I had a brand new
> >>> CM500 that I used for a week of hard operating while on a pretty
> >>> island and the boom came loose after a couple of days.
> >>
> >> Your experience is unusual. In about 11 years, the only thing that
> >> has ever gone wrong with my CM500s have been a broken cable, which,
> >> unfortunately, is not replaceable. I'm kind of a klutz, so I'm hard
> >> on cables, dropping them, kicking them, etc. Perhaps it got broken in
> shipping?
> >>
> >> I've never used anything but VOX for SSB and digital modes. That's
> >> always worked just fine as long as there's not loud noise (like when
> >> the XYL walks through the shack and lets the screen door slam). :)
> >>
> >> 73, Jim K9YC
> >> __
> >> Elecraft mailing list
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> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:Elecraft@mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net Please help support this
> >> email
> >> list: http://www.qsl.net

Re: [Elecraft] CM500 headset on K3S and KX3?

[Jim Brown]

On 5/6/2020 4:52 PM, Joe Subich, W4TV wrote:

A heavy, bulky, "head squeezer" for more than five times as much
as the CM500 ...


Yes. I tried them on when they first came out and found them to be an 
instrument of torture. Years later, after hearing guys rave about how 
comfy the were, I tried them on again, with the same result.


73, Jim K9YC
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Jim Brown]

On 5/6/2020 3:08 PM, Fred Jensen wrote:
I guess all microphones tend to accentuate the bass as you get closer 
and closer, exactly the opposite of what you want for communications. 
Electrets seem to be fairly immune to this, the old classic RCA 44-BX 
was notorious for the effect.


That's a characteristic of nearly all DIRECTIONAL mics -- those that  On 
provide a single rear opening the capsule to cancel sound from the rear. 
Variable-D mics, virtually all of which today are made by Electro-Voice, 
have multiple openings along the "handle" of the mic body to provide the 
cancellation, and they have very little of that bass build-up. The 
earliest made by EV was the model 666, called "the Buchanan Hammer" 
because EV was in Buchanan, MI, and Lou Burroughs, who along with Al 
Kahn founded EV in the '30s, demonstrated the ruggedness of the new 666 
to broadcast conventions by driving nails with it.


When Lou wanted to retire, they sold the company to Gulton Industries. 
Al took his share and started Ten Tec, across the street from their mic 
and speaker factory in Sevierville, TN.  Al was K4FW. I worked him once, 
on CW, using one of his radios. I was mobile from a campground in AR.


Shure and AKG both made variable-D mics for several decades, but I don't 
think they still do. Modern variable-D mics are the EV RE10, RE11, RE15, 
RE16, RE18, and RE20. Last I looked, only the RE16 and RE20 were still 
in production, but there may be new models since I was active in the 
biz. The RE20 is quite popular as an announce mic.

https://www.electrovoice.com/product.php?id=91

I know of no variable-D electret mics.

5/6/2020 11:39 AM, Walter Underwood wrote:
> If I was going to upgrade my headset, I’d start with headsets used by 
sports broadcasters and ENG teams.


Those headsets are EXPENSIVE, the mics are low impedance PRO mics, and 
are designed to provide maximum noise rejection. IF they are electrets, 
they won't work with ham gear without a preamp that provides Phantom 
Power (NOT the same as bias).


73, Jim K9YC
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Re: [Elecraft] CM500 headset on K3S and KX3?

[K8TE]

I have used the CM500 for many years.  I have replaced the ear muffs with
Koss's version.  However, like Grant, I bought a RS60CF and have not looked
back.  Unlike Joe, I find them very comfortable, even after many hours in a
contest.  They cut out extraneous noise very well.  The K3 TX equalizer
provides excellent audio response.

I use a pair of CM500's for portable work.  So far, I've not had to use the
spare set in spite of a lot of use and abuse.  When we do Field Day for real
again, I will likely use the RS60CF set to cut down on the inevitable
background chatter the CM500 doesn't.

73, Bill, K8TE



--
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Joe Subich, W4TV]

On 2020-05-06 1:16 PM, Grant Youngman wrote:

> Replaced them eventually with an RS60CF, and never looked back.

A heavy, bulky, "head squeezer" for more than five times as much
as the CM500 ...

73,

   ... Joe, W4TV


On 2020-05-06 1:16 PM, Grant Youngman wrote:

I bought a pair of CM500’s when they became all the rage a few years ago.  
Never liked them.  The mic sounds ok, but they’re just too loosely-goosey a fit 
and I find them fiddly and not very stable on the head.  I used them for a 
while and tossed them into the pile of too much stuff I bought and don’t use.

Replaced them eventually with an RS60CF, and never looked back.  Cable sets for 
both the KX3 and K3(K4). And yes — I know there are a lot of people who don’t 
like those, either.  But I do.  All a matter of personal choice, I guess  :-)  
David Clark makes a small and inexpensive soft-case that fits them perfectly, 
too.

Grant NQ5T




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Re: [Elecraft] CM500 headset on K3S and KX3?

[Fred Jensen]

History is more than a little ambiguous. Wikipedia ascribes the "first 
high-powered" Talk Box to Bob Heil [K9EID] for Joe Walsh, [WB6ACU] which 
was a 250 watt amp + hi-pass filter.  However, Walsh credits an EE and 
steel guitarist [Bill West] with inventing it.


Peter Townshend claims to have invented a version of the Talk Box during 
a Who tour in 1976.  However, Bob Heil sold the manufacturing rights to 
Dunlop Mfr. building them to Heil's 1973 design standards.  Peter 
Frampton says he first heard a Talk Box in 1970, and that Bob Heil gave 
him a custom built one as a Christmas present in 1974.  He became 
proficient at it and is now often associated with it.  It appears that 
every musical performer since then has used a Talk Box and at least a 
few assert invention.


I use a Heil ProSet IC however I'm rarely on SSB.  When I have been on, 
I often get unsolicited "great audio" comments, no doubt because of my 
sonorous broadcast voice as much as the proset. [:=)  I use a CM-500 
when operating W7RN remotely but I've never done phone remote.  I find 
the ProSet to be a little easier on the ears with prolonged use than the 
CM-500, but both work well for me.  As has been mentioned, a lot depends 
on how you place the mic and how you tailor the TX response and 
compression.  I guess all microphones tend to accentuate the bass as you 
get closer and closer, exactly the opposite of what you want for 
communications. Electrets seem to be fairly immune to this, the old 
classic RCA 44-BX was notorious for the effect.


73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County


On Wed, May 6, 2020, 13:51  wrote:


Interesting that Heil is not represented commercially. I believe that
Bob Heil invented the talk box that Peter Frampton made famous. I use
a Sony MDR-7506 for RTTY and CW but I do use a Heil ProSet IC for SSB.

John KK9A



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Re: [Elecraft] CM500 headset on K3S and KX3?

[Charlie T]

If you can find them, "velour" pads are GREAT. 
Very comfortable, Softer and NO flaking.
I replaced the pads on my Sony MDR-7506's with them.
I especially like these Sony's since they have excellent high frequency 
response (better than the CM500's) which is perfect for my high freq hearing 
loss.
Not sure if they'll fit, but somebody out there must make velour pads for the 
CM500's.

73, Charlie k3ICH




-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Walter Underwood
Sent: Wednesday, May 06, 2020 12:53 PM
To: Elecraft Mailing List 
Subject: Re: [Elecraft] CM500 headset on K3S and KX3?

My CM500’s earpads are flaking pretty badly, leaving little back bits around 
the home office/shack. They still work fine. I purchased them in December 2012. 
I see that the same order has Eneloop XX batteries and a LowePro Edit 140 case, 
so that was all ordered to go with my brand-new KX3.

Comments on my blog post suggested the Koss SB45 as another alternative. This 
also has an electret mic, but somewhat different fit over the ears, and it is 
cheaper.

https://www.amazon.com/Koss-sb45-SB-45-Communication-Stereophones/dp/B00081A2CW

Do not get the Koss SB40. That is the same headset as the Yamaha CM500, but 
with an inferior dynamic mic.

The mic connector on my Yamaha CM500 is labeled “KOSS”, for what that’s worth. 
I noticed that when choosing photos for my blog post.

It is normal for earpads to wear out. I replaced the pads on my Grado SR225e 
phones after five years.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On May 6, 2020, at 8:25 AM, N2TK via Elecraft  
> wrote:
> 
> I bought replacement ear pad cushions and earpad covers for Koss UR20, 
> headphones on eBay a while back for $14.24. They fit the CM500 fine. A pain 
> to change but worth it.
> I have had very good results with CM500. They fit my head better than the 
> Heil's which were too tight. I would rather have a material cover which I 
> find more comfortable for wearing for many hours in a contest. I use a 
> quarter of a paper towel between the headset cushions and my ears. That works 
> fine.
> And the CM500's are so cheap I bought a spare, just in case.
> N2TK, Tony
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
>  On Behalf Of Wes
> Sent: Tuesday, May 5, 2020 9:45 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] CM500 headset on K3S and KX3?
> 
> The failures I have are the ear pads disintegrate.  Someone said Koss pads 
> could work but that hasn't been my experience. I've found some '500s at 
> estate sales where I snap them up.  Currently the law firm where my fiance is 
> employed is working from home and she's using a set on her computer to 
> "attend" on-line meetings.  I guess I can add "IT Manager" to my resume, 
> since I'm helping her with her connections.  I second the use of VOX.
> 
> Wes  N7WS
> 
> On 5/5/2020 5:32 PM, Jim Brown wrote:
>> On 5/5/2020 4:44 PM, Paul Gacek via Elecraft wrote:
>>> For what its worth and everyones milage will vary, I had a brand new
>>> CM500 that I used for a week of hard operating while on a pretty 
>>> island and the boom came loose after a couple of days.
>> 
>> Your experience is unusual. In about 11 years, the only thing that 
>> has ever gone wrong with my CM500s have been a broken cable, which, 
>> unfortunately, is not replaceable. I'm kind of a klutz, so I'm hard 
>> on cables, dropping them, kicking them, etc. Perhaps it got broken in 
>> shipping?
>> 
>> I've never used anything but VOX for SSB and digital modes. That's 
>> always worked just fine as long as there's not loud noise (like when 
>> the XYL walks through the shack and lets the screen door slam). :)
>> 
>> 73, Jim K9YC
>> __
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>> This list hosted by: http://www.qsl.net Please help support this 
>> email
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>> wes_n...@triconet.org
> 
> 
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Josh Fiden]

The talk box predates the Heil version that Frampton used. 

Sent from my mobile device

> On May 6, 2020, at 11:51 AM, j...@kk9a.com wrote:
> 
> Interesting that Heil is not represented commercially. I believe that Bob 
> Heil invented the talk box that Peter Frampton made famous. I use a Sony 
> MDR-7506 for RTTY and CW but I do use a Heil ProSet IC for SSB.
> 

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Re: [Elecraft] CM500 headset on K3S and KX3?

[Jim Rhodes]

Over the years I have worn out 2 of the SB-40s and always had good audio
reports. You can sound terrible on any mike if they aren't used correctly.

On Wed, May 6, 2020, 13:51  wrote:

> Interesting that Heil is not represented commercially. I believe that
> Bob Heil invented the talk box that Peter Frampton made famous. I use
> a Sony MDR-7506 for RTTY and CW but I do use a Heil ProSet IC for SSB.
>
> John KK9A
>
> Jim Brown K9YC wrote:
>
> Heil products are an example of better sound through marketing. They're
> more expensive because they spend a lot of money on advertising to
> convince hams they're worth it. They also claim to make pro mics. I've
> been a member of the AES Standards Committee WG on microphones for more
> than 25 years, in which virtually all major microphone companies are
> represented. No one from the company is listed as a member, and I've
> never met Bob Heil or anyone from his company. Hams seem to think that
> because he did sound for a major rock band that his mics were good.
>
> 73, Jim K9YC
>
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Re: [Elecraft] CM500 Adapter

[Jim Rhodes]

The Amazon one is what I have had for several years. Works a charm and just
little cheaper!


On Wed, May 6, 2020, 14:06 Walter Underwood  wrote:

> $35 is too much for this mic adapter. It probably reflects the small lot
> manufacturing cost, but you don’t need to pay that.
>
> This adapter costs $5.45 and does the same thing.
>
> https://smile.amazon.com/gp/product/B68O5H/
>
> The KX3 mic connection is TRRS, but Ring 2 and Sleeve are both connected
> to ground. They are labeled mic ground and logic ground, but they are tied
> together inside the radio, so a TRS plug works just fine. The wiring detail
> is from the Fred Cady book.
>
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
>
> > On May 6, 2020, at 10:24 AM, Troy Davis  wrote:
> >
> > https://www.ebay.com/itm/351072109250
> >
> > —
> > Troy Davis
> > K4JDA
> >
> > __
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Re: [Elecraft] CM500 Adapter

[Walter Underwood]

$35 is too much for this mic adapter. It probably reflects the small lot 
manufacturing cost, but you don’t need to pay that.

This adapter costs $5.45 and does the same thing.

https://smile.amazon.com/gp/product/B68O5H/

The KX3 mic connection is TRRS, but Ring 2 and Sleeve are both connected to 
ground. They are labeled mic ground and logic ground, but they are tied 
together inside the radio, so a TRS plug works just fine. The wiring detail is 
from the Fred Cady book.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On May 6, 2020, at 10:24 AM, Troy Davis  wrote:
> 
> https://www.ebay.com/itm/351072109250
> 
> —
> Troy Davis
> K4JDA
> 
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Re: [Elecraft] CM500 headset on K3S and KX3?

[john]

Interesting that Heil is not represented commercially. I believe that  
Bob Heil invented the talk box that Peter Frampton made famous. I use  
a Sony MDR-7506 for RTTY and CW but I do use a Heil ProSet IC for SSB.


John KK9A

Jim Brown K9YC wrote:

Heil products are an example of better sound through marketing. They're
more expensive because they spend a lot of money on advertising to
convince hams they're worth it. They also claim to make pro mics. I've
been a member of the AES Standards Committee WG on microphones for more
than 25 years, in which virtually all major microphone companies are
represented. No one from the company is listed as a member, and I've
never met Bob Heil or anyone from his company. Hams seem to think that
because he did sound for a major rock band that his mics were good.

73, Jim K9YC

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Re: [Elecraft] CM500 headset on K3S and KX3?

[Jim Brown]

Probably like Baufong radios, rip-offs of someone else's product. No, 
I've never heard of it. A story.


A colleague in pro audio, excellent engineer, designer of sound systems 
in the US Senate, House, and White House, wanted to do a good deed for 
rock and roll churches who used a lot of mics. He imported mics from a 
company in China. Samples were great, so he placed an order. Production 
quality was VERY different. Like Baufong, we're talking $40-$60 for mics 
competing with EU mics that sell for $1,000 - $1,500.


Quality companies like Shure and Switchcraft have long huge problems 
with counterfeits of their products, and counterfeit mechanical and 
structural parts have long been a problem for manufacturers. I remember 
reading about that in the aircraft industry more than a decade ago.


73, Jim K9YC

On 5/6/2020 5:32 AM, Lyn Norstad wrote:

There is a (presumably Chinese) mic known as the BM800 which is marketed
under several different names.  I am currently using one on a boom with
shock mount, wind screen and foot switch just because I like hands-free
operation ... and am too frugal (i.e.: cheap) to spend the $$ for a Heil
equivalent.

Are you familiar with this mic, and what are your thoughts?  I get excellent
reports with it on my (non-Elecraft) rig.


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Re: [Elecraft] CM500 headset on K3S and KX3?

[Walter Underwood]

> On May 6, 2020, at 10:54 AM, Jim Brown  wrote:
> 
>> Do not get the Koss SB40. That is the same headset as the Yamaha CM500, but 
>> with an inferior dynamic mic.
> 
> There is nothing inherently inferior about dynamic mics, especially for 
> speech -- the vast majority of mics used in sound reinforcement and 
> broadcasting are dynamic mics. But like any technology, some products are 
> better than others.

Of course. This particular headset has an inferior dynamic mic, according to 
reviews. At this price point, I’d expect electrets to be the best performers.

If I was going to upgrade my headset, I’d start with headsets used by sports 
broadcasters and ENG teams. Is it still called “electronic news gathering”?

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
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Re: [Elecraft] CM500 Adapter

[Josh Fiden]

$35 ? Ouch. $5 in parts and break out the soldering iron! Mouser has these 
connectors for $1.50-ish each. 

73
Josh W6XU 

Sent from my mobile device

> On May 6, 2020, at 10:25 AM, Troy Davis  wrote:
> 
> https://www.ebay.com/itm/351072109250
> 
> —
> 

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Re: [Elecraft] CM500 headset on K3S and KX3?

[Jim Brown]

On 5/6/2020 9:53 AM, Walter Underwood wrote:

Comments on my blog post suggested the Koss SB45 as another alternative. This 
also has an electret mic, but somewhat different fit over the ears, and it is 
cheaper.

https://www.amazon.com/Koss-sb45-SB-45-Communication-Stereophones/dp/B00081A2CW


K6LL, a serious contester, likes this headset. I noted this in a piece I 
wrote several years ago for National Contest Journal. GM3SEK reported 
that Yamaha products are not sold in the UK, and that his wife likes the 
lighter weight Koss CS100 headset.

http://k9yc.com/ContestAudio.pdf


Do not get the Koss SB40. That is the same headset as the Yamaha CM500, but 
with an inferior dynamic mic.


There is nothing inherently inferior about dynamic mics, especially for 
speech -- the vast majority of mics used in sound reinforcement and 
broadcasting are dynamic mics. But like any technology, some products 
are better than others.

It is normal for earpads to wear out. I replaced the pads on my Grado SR225e 
phones after five years.


Yes. I replace earpads on my Sony MDR7506 periodically.

For many things we wear, comfort can be important, and, with headsets, 
that depends on the size and shape of our heads and even our ears, as 
well as the design and manufacturing quality of the headset. For many 
years, I've slept wearing Sony MDR7506 phones listening to jazz, and I 
also use them working CW-only contests. I find the CM500 equally 
comfortable.


73, Jim K9YC
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[Elecraft] CM500 Adapter

[Troy Davis]

https://www.ebay.com/itm/351072109250

—
Troy Davis
K4JDA

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Re: [Elecraft] CM500 headset on K3S and KX3?

[Grant Youngman]

I bought a pair of CM500’s when they became all the rage a few years ago.  
Never liked them.  The mic sounds ok, but they’re just too loosely-goosey a fit 
and I find them fiddly and not very stable on the head.  I used them for a 
while and tossed them into the pile of too much stuff I bought and don’t use.

Replaced them eventually with an RS60CF, and never looked back.  Cable sets for 
both the KX3 and K3(K4). And yes — I know there are a lot of people who don’t 
like those, either.  But I do.  All a matter of personal choice, I guess  :-)  
David Clark makes a small and inexpensive soft-case that fits them perfectly, 
too.

Grant NQ5T

> On May 6, 2020, at 12:53 PM, Walter Underwood  wrote:
> 
> My CM500’s earpads are flaking pretty badly, leaving little back bits around 
> the home office/shack. 
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Walter Underwood]

My CM500’s earpads are flaking pretty badly, leaving little back bits around 
the home office/shack. They still work fine. I purchased them in December 2012. 
I see that the same order has Eneloop XX batteries and a LowePro Edit 140 case, 
so that was all ordered to go with my brand-new KX3.

Comments on my blog post suggested the Koss SB45 as another alternative. This 
also has an electret mic, but somewhat different fit over the ears, and it is 
cheaper.

https://www.amazon.com/Koss-sb45-SB-45-Communication-Stereophones/dp/B00081A2CW

Do not get the Koss SB40. That is the same headset as the Yamaha CM500, but 
with an inferior dynamic mic.

The mic connector on my Yamaha CM500 is labeled “KOSS”, for what that’s worth. 
I noticed that when choosing photos for my blog post.

It is normal for earpads to wear out. I replaced the pads on my Grado SR225e 
phones after five years.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On May 6, 2020, at 8:25 AM, N2TK via Elecraft  
> wrote:
> 
> I bought replacement ear pad cushions and earpad covers for Koss UR20, 
> headphones on eBay a while back for $14.24. They fit the CM500 fine. A pain 
> to change but worth it.
> I have had very good results with CM500. They fit my head better than the 
> Heil's which were too tight. I would rather have a material cover which I 
> find more comfortable for wearing for many hours in a contest. I use a 
> quarter of a paper towel between the headset cushions and my ears. That works 
> fine.
> And the CM500's are so cheap I bought a spare, just in case.
> N2TK, Tony
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net  On 
> Behalf Of Wes
> Sent: Tuesday, May 5, 2020 9:45 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] CM500 headset on K3S and KX3?
> 
> The failures I have are the ear pads disintegrate.  Someone said Koss pads 
> could work but that hasn't been my experience. I've found some '500s at 
> estate sales where I snap them up.  Currently the law firm where my fiance is 
> employed is working from home and she's using a set on her computer to 
> "attend" on-line meetings.  I guess I can add "IT Manager" to my resume, 
> since I'm helping her with her connections.  I second the use of VOX.
> 
> Wes  N7WS
> 
> On 5/5/2020 5:32 PM, Jim Brown wrote:
>> On 5/5/2020 4:44 PM, Paul Gacek via Elecraft wrote:
>>> For what its worth and everyones milage will vary, I had a brand new 
>>> CM500 that I used for a week of hard operating while on a pretty 
>>> island and the boom came loose after a couple of days.
>> 
>> Your experience is unusual. In about 11 years, the only thing that has 
>> ever gone wrong with my CM500s have been a broken cable, which, 
>> unfortunately, is not replaceable. I'm kind of a klutz, so I'm hard on 
>> cables, dropping them, kicking them, etc. Perhaps it got broken in shipping?
>> 
>> I've never used anything but VOX for SSB and digital modes. That's 
>> always worked just fine as long as there's not loud noise (like when 
>> the XYL walks through the shack and lets the screen door slam). :)
>> 
>> 73, Jim K9YC
>> __
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>> wes_n...@triconet.org
> 
> 
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Re: [Elecraft] CM500 headset on K3S and KX3?

[N2TK via Elecraft]

I bought replacement ear pad cushions and earpad covers for Koss UR20, 
headphones on eBay a while back for $14.24. They fit the CM500 fine. A pain to 
change but worth it.
I have had very good results with CM500. They fit my head better than the 
Heil's which were too tight. I would rather have a material cover which I find 
more comfortable for wearing for many hours in a contest. I use a quarter of a 
paper towel between the headset cushions and my ears. That works fine.
And the CM500's are so cheap I bought a spare, just in case.
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Wes
Sent: Tuesday, May 5, 2020 9:45 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] CM500 headset on K3S and KX3?

The failures I have are the ear pads disintegrate.  Someone said Koss pads 
could work but that hasn't been my experience. I've found some '500s at estate 
sales where I snap them up.  Currently the law firm where my fiance is employed 
is working from home and she's using a set on her computer to "attend" on-line 
meetings.  I guess I can add "IT Manager" to my resume, since I'm helping her 
with her connections.  I second the use of VOX.

Wes  N7WS

On 5/5/2020 5:32 PM, Jim Brown wrote:
> On 5/5/2020 4:44 PM, Paul Gacek via Elecraft wrote:
>> For what its worth and everyones milage will vary, I had a brand new 
>> CM500 that I used for a week of hard operating while on a pretty 
>> island and the boom came loose after a couple of days.
>
> Your experience is unusual. In about 11 years, the only thing that has 
> ever gone wrong with my CM500s have been a broken cable, which, 
> unfortunately, is not replaceable. I'm kind of a klutz, so I'm hard on 
> cables, dropping them, kicking them, etc. Perhaps it got broken in shipping?
>
> I've never used anything but VOX for SSB and digital modes. That's 
> always worked just fine as long as there's not loud noise (like when 
> the XYL walks through the shack and lets the screen door slam). :)
>
> 73, Jim K9YC
> __
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> list: http://www.qsl.net/donate.html Message delivered to 
> wes_n...@triconet.org


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Re: [Elecraft] CM500 headset on K3S and KX3?

[Lyn Norstad]

Jim -

There is a (presumably Chinese) mic known as the BM800 which is marketed
under several different names.  I am currently using one on a boom with
shock mount, wind screen and foot switch just because I like hands-free
operation ... and am too frugal (i.e.: cheap) to spend the $$ for a Heil
equivalent.

Are you familiar with this mic, and what are your thoughts?  I get excellent
reports with it on my (non-Elecraft) rig.

73
Lyn, W0LEN
 

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: Tuesday, May 05, 2020 10:19 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] CM500 headset on K3S and KX3?

Heil products are an example of better sound through marketing. They're 
more expensive because they spend a lot of money on advertising to 
convince hams they're worth it. They also claim to make pro mics. I've 
been a member of the AES Standards Committee WG on microphones for more 
than 25 years, in which virtually all major microphone companies are 
represented. No one from the company is listed as a member, and I've 
never met Bob Heil or anyone from his company. Hams seem to think that 
because he did sound for a major rock band that his mics were good.

73, Jim K9YC
__

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Re: [Elecraft] CM500 headset on K3S and KX3?

[Nr4c]

The 2.5 mm is about 0.100 in. A 3/32 is .093 or 0.007 in smaller. 

Sent from my iPhone
...nr4c. bill


> On May 5, 2020, at 11:16 PM, Grant Youngman  wrote:
> 
> Checked the manual.  It’s on the TIP connection of ACC2.  Set ACC2 IO in the 
> menu to LO=PTT.
> 
> Grant NQ5T
> 
>> On May 5, 2020, at 11:06 PM, Grant Youngman  wrote:
>> 
>> The ACC2 connector is a 2.5mm TRS connector, not 1/8” (3.5mm).   PTT is 
>> either on the tip or ring, I don’t recall which off hand — check the manual.
>> 
>> Grant NQ5T
>> 
>>> 
>>> -- On the KX3, plug the headset's mike and phone plugs into the respective 
>>> jacks, and use a momentary-contact switch on a mono-style 1/8" plug in the 
>>> ACC2 jack as a manual PTT switch.
>>> 
> 
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Don Wilhelm]

Frank,

Although the K3S rear jack is marked mono, it is actually a stereo jack, 
but the ring connects to nothing - so no harm.


On the KX3, look in the manual for the MIC jack connections. It should 
tell you why you need to be aware of the situation that the CM500 plug 
can present.


Walt Underwood K6WRU has presented a link to an adapter that will allow 
you to plug the CM500 mic plug into a jack leaving the other jack 
available for us as PTT. Use of that adapter does not require you to set 
MIC BTN to off.


Be careful, not just any adapter will do - some are simple splitters 
that put both the tip and ring on both jacks.


73,
Don W3FPR

On 5/5/2020 10:43 PM, Frank O'Donnell wrote:
Thanks for the clear instructions from Don, and the helpful 
suggestions from everyone else. Piecing it all together, will this 
basically work?:


-- On the K3S, plug the CM500's mike and phone plugs into the 
respective jacks on the rig's rear panel. Wire a momentary-contact 
switch to an RCA plug inserted into the rig's PTT IN jack to serve as 
a manual PTT switch.


-- On the KX3, plug the headset's mike and phone plugs into the 
respective jacks, and use a momentary-contact switch on a mono-style 
1/8" plug in the ACC2 jack as a manual PTT switch.


The only thing I'm concerned about is the issue of mono vs stereo 
plugs. For example, the CM500's mike plug has stereo-style contacts, 
whereas the mic in jack on the K3S is marked "mono." There aren't any 
issues there?


On other points, if I were going all-in on becoming a regular phone 
operator I might look at other headsets such as the Heils. But what 
I'm looking at is being a bit player on a couple of nets very 
occasionally at most, so the CM500 seemed like a decent option.


Re VOX vs PTT, I can understand the convenience of the former, but 
being an occasional throat-clearer I wouldn't want to become a 
distractions on those nets.


Thanks again,

Frank


On 5/5/20 4:49 PM, Don Wilhelm wrote:

Frank,

For the K3S, just plug the microphone and headphone plugs into the 
rear panel jacks.  Set the MIC SEL to RP and turn bias on.


For the KX3. the easy way is to just turn MIC BTN off and plug it in. 
That microphone needs bias, and it will be supplied by the digital DC 
that normally is used for the MIC Button functions.


The harder way for the KX3 is to make an adapter (but it is not that 
hard)
Be aware that, like most computer microphones, the tip and the ring 
of the plug are wired together - so if you make an adapter, you must 
use a stereo jack so the audio is not shorted to ground.


If you make an adapter, you can include a connection for a PTT 
switch, but without that, you can put the KX3 into transmit with the 
XMIT button.


73,
Don W3FPR

On 5/5/2020 7:31 PM, Frank O'Donnell wrote:
Phone newbie here. Any recommendations on off-the-shelf cables or 
adapters, and a handheld switch, to enable use of a Yamaha CM500 
headset along with PTT functionality on both a K3S and KX3?


Thanks much,

Frank K6FOD


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Re: [Elecraft] CM500 headset on K3S and KX3?

[Jack Brindle via Elecraft]

Frank;

The rear-panel mic input on the K3 and K3S is actually a stereo jack. The ring 
connector is not connected. Plug the CM-500’s mic plug in (as I do), and it 
will work just fine!
Remember to enable bias on the rear panel Mic as W3FPR noted.

The CM-500 is an excellent headset for use with the K3. You should get many 
years of excellent service form it.

73!
Jack, W6FB


> On May 5, 2020, at 7:43 PM, Frank O'Donnell  wrote:
> 
> Thanks for the clear instructions from Don, and the helpful suggestions from 
> everyone else. Piecing it all together, will this basically work?:
> 
> -- On the K3S, plug the CM500's mike and phone plugs into the respective 
> jacks on the rig's rear panel. Wire a momentary-contact switch to an RCA plug 
> inserted into the rig's PTT IN jack to serve as a manual PTT switch.
> 
> -- On the KX3, plug the headset's mike and phone plugs into the respective 
> jacks, and use a momentary-contact switch on a mono-style 1/8" plug in the 
> ACC2 jack as a manual PTT switch.
> 
> The only thing I'm concerned about is the issue of mono vs stereo plugs. For 
> example, the CM500's mike plug has stereo-style contacts, whereas the mic in 
> jack on the K3S is marked "mono." There aren't any issues there?
> 
> On other points, if I were going all-in on becoming a regular phone operator 
> I might look at other headsets such as the Heils. But what I'm looking at is 
> being a bit player on a couple of nets very occasionally at most, so the 
> CM500 seemed like a decent option.
> 
> Re VOX vs PTT, I can understand the convenience of the former, but being an 
> occasional throat-clearer I wouldn't want to become a distractions on those 
> nets.
> 
> Thanks again,
> 
> Frank
> 
> 
> On 5/5/20 4:49 PM, Don Wilhelm wrote:
>> Frank,
>> 
>> For the K3S, just plug the microphone and headphone plugs into the rear 
>> panel jacks.  Set the MIC SEL to RP and turn bias on.
>> 
>> For the KX3. the easy way is to just turn MIC BTN off and plug it in. That 
>> microphone needs bias, and it will be supplied by the digital DC that 
>> normally is used for the MIC Button functions.
>> 
>> The harder way for the KX3 is to make an adapter (but it is not that hard)
>> Be aware that, like most computer microphones, the tip and the ring of the 
>> plug are wired together - so if you make an adapter, you must use a stereo 
>> jack so the audio is not shorted to ground.
>> 
>> If you make an adapter, you can include a connection for a PTT switch, but 
>> without that, you can put the KX3 into transmit with the XMIT button.
>> 
>> 73,
>> Don W3FPR
>> 
>> On 5/5/2020 7:31 PM, Frank O'Donnell wrote:
>>> Phone newbie here. Any recommendations on off-the-shelf cables or adapters, 
>>> and a handheld switch, to enable use of a Yamaha CM500 headset along with 
>>> PTT functionality on both a K3S and KX3?
>>> 
>>> Thanks much,
>>> 
>>> Frank K6FOD
> 
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Jim Brown]

On 5/5/2020 7:43 PM, Frank O'Donnell wrote:
On other points, if I were going all-in on becoming a regular phone 
operator I might look at other headsets such as the Heils. But what I'm 
looking at is being a bit player on a couple of nets very occasionally 
at most, so the CM500 seemed like a decent option.


Heil products are an example of better sound through marketing. They're 
more expensive because they spend a lot of money on advertising to 
convince hams they're worth it. They also claim to make pro mics. I've 
been a member of the AES Standards Committee WG on microphones for more 
than 25 years, in which virtually all major microphone companies are 
represented. No one from the company is listed as a member, and I've 
never met Bob Heil or anyone from his company. Hams seem to think that 
because he did sound for a major rock band that his mics were good.


73, Jim K9YC
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Grant Youngman]

Checked the manual.  It’s on the TIP connection of ACC2.  Set ACC2 IO in the 
menu to LO=PTT.

Grant NQ5T

> On May 5, 2020, at 11:06 PM, Grant Youngman  wrote:
> 
> The ACC2 connector is a 2.5mm TRS connector, not 1/8” (3.5mm).   PTT is 
> either on the tip or ring, I don’t recall which off hand — check the manual.
> 
> Grant NQ5T
> 
>> 
>> -- On the KX3, plug the headset's mike and phone plugs into the respective 
>> jacks, and use a momentary-contact switch on a mono-style 1/8" plug in the 
>> ACC2 jack as a manual PTT switch.
>> 

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Re: [Elecraft] CM500 headset on K3S and KX3?

[Nr4c]

 I adapters needed. 

CM500 plugs right into the rear Mic and Phone jack on K3(s). 

Also the KX3, just turn OFF Bias and Buttons. 

PTT is available on rear PTT RCA jack on K3(s) and Tip and Shield on KX3 
Accessary jack ( a 3/32 TRS Jack next to the I/Q  Jack).   Use switch of your 
choice;  an old J38 works real well here.  Use the “shoring bar” for long 
conversations. 

Sent from my iPhone
...nr4c. bill


> On May 5, 2020, at 7:33 PM, Frank O'Donnell  wrote:
> 
> Phone newbie here. Any recommendations on off-the-shelf cables or adapters, 
> and a handheld switch, to enable use of a Yamaha CM500 headset along with PTT 
> functionality on both a K3S and KX3?
> 
> Thanks much,
> 
> Frank K6FOD
> 
> 
> 
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Grant Youngman]

The ACC2 connector is a 2.5mm TRS connector, not 1/8” (3.5mm).   PTT is either 
on the tip or ring, I don’t recall which off hand — check the manual.

Grant NQ5T

> 
> -- On the KX3, plug the headset's mike and phone plugs into the respective 
> jacks, and use a momentary-contact switch on a mono-style 1/8" plug in the 
> ACC2 jack as a manual PTT switch.
> 
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Frank O'Donnell]

Thanks for the clear instructions from Don, and the helpful suggestions 
from everyone else. Piecing it all together, will this basically work?:


-- On the K3S, plug the CM500's mike and phone plugs into the respective 
jacks on the rig's rear panel. Wire a momentary-contact switch to an RCA 
plug inserted into the rig's PTT IN jack to serve as a manual PTT switch.


-- On the KX3, plug the headset's mike and phone plugs into the 
respective jacks, and use a momentary-contact switch on a mono-style 
1/8" plug in the ACC2 jack as a manual PTT switch.


The only thing I'm concerned about is the issue of mono vs stereo plugs. 
For example, the CM500's mike plug has stereo-style contacts, whereas 
the mic in jack on the K3S is marked "mono." There aren't any issues there?


On other points, if I were going all-in on becoming a regular phone 
operator I might look at other headsets such as the Heils. But what I'm 
looking at is being a bit player on a couple of nets very occasionally 
at most, so the CM500 seemed like a decent option.


Re VOX vs PTT, I can understand the convenience of the former, but being 
an occasional throat-clearer I wouldn't want to become a distractions on 
those nets.


Thanks again,

Frank


On 5/5/20 4:49 PM, Don Wilhelm wrote:

Frank,

For the K3S, just plug the microphone and headphone plugs into the 
rear panel jacks.  Set the MIC SEL to RP and turn bias on.


For the KX3. the easy way is to just turn MIC BTN off and plug it in. 
That microphone needs bias, and it will be supplied by the digital DC 
that normally is used for the MIC Button functions.


The harder way for the KX3 is to make an adapter (but it is not that 
hard)
Be aware that, like most computer microphones, the tip and the ring of 
the plug are wired together - so if you make an adapter, you must use 
a stereo jack so the audio is not shorted to ground.


If you make an adapter, you can include a connection for a PTT switch, 
but without that, you can put the KX3 into transmit with the XMIT button.


73,
Don W3FPR

On 5/5/2020 7:31 PM, Frank O'Donnell wrote:
Phone newbie here. Any recommendations on off-the-shelf cables or 
adapters, and a handheld switch, to enable use of a Yamaha CM500 
headset along with PTT functionality on both a K3S and KX3?


Thanks much,

Frank K6FOD


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Re: [Elecraft] CM500 headset on K3S and KX3?

[Wes]

The failures I have are the ear pads disintegrate.  Someone said Koss pads could 
work but that hasn't been my experience. I've found some '500s at estate sales 
where I snap them up.  Currently the law firm where my fiance is employed is 
working from home and she's using a set on her computer to "attend" on-line 
meetings.  I guess I can add "IT Manager" to my resume, since I'm helping her 
with her connections.  I second the use of VOX.


Wes  N7WS

On 5/5/2020 5:32 PM, Jim Brown wrote:

On 5/5/2020 4:44 PM, Paul Gacek via Elecraft wrote:
For what its worth and everyones milage will vary, I had a brand new CM500 
that I used for a week of hard operating while on a pretty island and the 
boom came loose after a couple of days.


Your experience is unusual. In about 11 years, the only thing that has ever 
gone wrong with my CM500s have been a broken cable, which, unfortunately, is 
not replaceable. I'm kind of a klutz, so I'm hard on cables, dropping them, 
kicking them, etc. Perhaps it got broken in shipping?


I've never used anything but VOX for SSB and digital modes. That's always 
worked just fine as long as there's not loud noise (like when the XYL walks 
through the shack and lets the screen door slam). :)


73, Jim K9YC
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Re: [Elecraft] CM500 headset on K3S and KX3?

[rich hurd WC3T]

I bought this because my soldering skills are not what they once were.
(Used to do MIL-spec, now I’m lucky to hit the joint with the iron. ).

https://shop.technofix.uk/hand-ptt-switch-for-elecraft-kx3-2-5mm-jack

Plugs into the ACC2 jack directly.  Instructions are on the page.   Works
FB.  It and my Yamaha are inseparable.

On Tue, May 5, 2020 at 20:32 Jim Brown  wrote:

> On 5/5/2020 4:44 PM, Paul Gacek via Elecraft wrote:
> > For what its worth and everyones milage will vary, I had a brand new
> CM500 that I used for a week of hard operating while on a pretty island and
> the boom came loose after a couple of days.
>
> Your experience is unusual. In about 11 years, the only thing that has
> ever gone wrong with my CM500s have been a broken cable, which,
> unfortunately, is not replaceable. I'm kind of a klutz, so I'm hard on
> cables, dropping them, kicking them, etc. Perhaps it got broken in
> shipping?
>
> I've never used anything but VOX for SSB and digital modes. That's
> always worked just fine as long as there's not loud noise (like when the
> XYL walks through the shack and lets the screen door slam). :)
>
> 73, Jim K9YC
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-- 
72,
Rich Hurd / WC3T / DMR: 3142737
Northampton County RACES, EPA-ARRL Public Information Officer for Scouting
Latitude: 40.761621 Longitude: -75.288988  (40°45.68' N 75°17.33' W) Grid:
*FN20is*
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Jim Brown]

On 5/5/2020 4:44 PM, Paul Gacek via Elecraft wrote:

For what its worth and everyones milage will vary, I had a brand new CM500 that 
I used for a week of hard operating while on a pretty island and the boom came 
loose after a couple of days.


Your experience is unusual. In about 11 years, the only thing that has 
ever gone wrong with my CM500s have been a broken cable, which, 
unfortunately, is not replaceable. I'm kind of a klutz, so I'm hard on 
cables, dropping them, kicking them, etc. Perhaps it got broken in 
shipping?


I've never used anything but VOX for SSB and digital modes. That's 
always worked just fine as long as there's not loud noise (like when the 
XYL walks through the shack and lets the screen door slam). :)


73, Jim K9YC
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Don Wilhelm]

Frank,

For the K3S, just plug the microphone and headphone plugs into the rear 
panel jacks.  Set the MIC SEL to RP and turn bias on.


For the KX3. the easy way is to just turn MIC BTN off and plug it in. 
That microphone needs bias, and it will be supplied by the digital DC 
that normally is used for the MIC Button functions.


The harder way for the KX3 is to make an adapter (but it is not that hard)
Be aware that, like most computer microphones, the tip and the ring of 
the plug are wired together - so if you make an adapter, you must use a 
stereo jack so the audio is not shorted to ground.


If you make an adapter, you can include a connection for a PTT switch, 
but without that, you can put the KX3 into transmit with the XMIT button.


73,
Don W3FPR

On 5/5/2020 7:31 PM, Frank O'Donnell wrote:
Phone newbie here. Any recommendations on off-the-shelf cables or 
adapters, and a handheld switch, to enable use of a Yamaha CM500 headset 
along with PTT functionality on both a K3S and KX3?


Thanks much,

Frank K6FOD



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Re: [Elecraft] CM500 headset on K3S and KX3?

[Paul Gacek via Elecraft]

Frank

For what its worth and everyones milage will vary, I had a brand new CM500 that 
I used for a week of hard operating while on a pretty island and the boom came 
loose after a couple of days. Since then I have reliably used the Elecraft sold 
Heil Proset at home and other pretty islands. Ironically I bought the CM500 as 
I didn't want my Heil abused in transit or when operating away from home.

From memory no additional adapters are needed for use with the KX3 and I find 
it easier (but friends don’t) to use VOX.

Paul
W6PNG/M0SNA
www.nomadic.blog

> On May 5, 2020, at 4:31 PM, Frank O'Donnell  wrote:
> 
> Phone newbie here. Any recommendations on off-the-shelf cables or adapters, 
> and a handheld switch, to enable use of a Yamaha CM500 headset along with PTT 
> functionality on both a K3S and KX3?
> 
> Thanks much,
> 
> Frank K6FOD
> 
> 
> 
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Re: [Elecraft] CM500 headset on K3S and KX3?

[Walter Underwood]

For the KX3, an off-the-shelf stereo-to-mono splitter will separate the mic and 
PTT lines. It also separates the mic bias (clean) from the logic signal (not so 
clean). Details here:

https://observer.wunderwood.org/2015/08/16/yamaha-cm500-headset-with-ptt-on-elecraft-kx3/

For transmit audio setup, I collected various bits of knowledge from the manual 
and this list into a single article.

https://observer.wunderwood.org/2015/09/09/transmit-audio-and-compression-with-the-elecraft-kx3/

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On May 5, 2020, at 4:31 PM, Frank O'Donnell  wrote:
> 
> Phone newbie here. Any recommendations on off-the-shelf cables or adapters, 
> and a handheld switch, to enable use of a Yamaha CM500 headset along with PTT 
> functionality on both a K3S and KX3?
> 
> Thanks much,
> 
> Frank K6FOD
> 
> 
> 
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[Elecraft] CM500 headset on K3S and KX3?

[Frank O'Donnell]

Phone newbie here. Any recommendations on off-the-shelf cables or 
adapters, and a handheld switch, to enable use of a Yamaha CM500 headset 
along with PTT functionality on both a K3S and KX3?


Thanks much,

Frank K6FOD



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Re: [Elecraft] CM500 Mic ?

[Phil Kane]

On 1/28/2019 6:41 PM, Bob McGraw K4TAX wrote:

> Yes but..when one looks at the SPECS  one will see "Microphone
> Type:    Dynamic".    I guess one could consider that to be "electric".

As one of my mentors in the legal profession  taught me:  when
confronted with two opposing statements from the same source, you ask
"in which one are you lying?".  :)

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon
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Re: [Elecraft] CM500 Mic ?

[Dave G3WGN M6O]

Packaging still does say dynamic (as of a December 2018 purchase), but it IS
an electret for sure.
73, David G3WGN M6O


Nr4c wrote
> The packaging used to say “Dynamic” mic. But it’s not. It’s an electret. 
> 
> And it comes with a small battery box to provide the bias when using with
> radios that don’t provide bias on the audio jack. 
> 
> Sent from my iPhone
> ...nr4c. bill
> 
> 
>> On Jan 28, 2019, at 9:19 PM, 

> john@

>  

> john@

>  wrote:
>> 
>> The manufacture says it is a sensitive electric microphone:
>> https://usa.yamaha.com/products/music_production/accessories/cm500/index.htm
>> l 
>> 
>> So does Amazon:
>> https://www.amazon.com/Yamaha-CM500-Headset-Built-Microphone/dp/B000BZ6ZX0/r
>> ef=sr_1_1?ie=UTF8=1548727771=8-1=yamaha+cm500
>> 
>> Perhaps that translates to Electret:)
>> 
>> John KK9A
>> 
>> 
>> 
>> Paul Ecker W2ECK wrote: 
>> 
>> Does anyone know if the CM500 has a Electret or Dynamic mic?
>> 
>> 73
>> Paul
>> w2eck
>> 
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> lists+1215531472858-365791@.nabble





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Re: [Elecraft] CM500 Mic ?

[Nr4c]

The packaging used to say “Dynamic” mic. But it’s not. It’s an electret. 

And it comes with a small battery box to provide the bias when using with 
radios that don’t provide bias on the audio jack. 

Sent from my iPhone
...nr4c. bill


> On Jan 28, 2019, at 9:19 PM,   wrote:
> 
> The manufacture says it is a sensitive electric microphone:
> https://usa.yamaha.com/products/music_production/accessories/cm500/index.htm
> l 
> 
> So does Amazon:
> https://www.amazon.com/Yamaha-CM500-Headset-Built-Microphone/dp/B000BZ6ZX0/r
> ef=sr_1_1?ie=UTF8=1548727771=8-1=yamaha+cm500
> 
> Perhaps that translates to Electret:)
> 
> John KK9A
> 
> 
> 
> Paul Ecker W2ECK wrote: 
> 
> Does anyone know if the CM500 has a Electret or Dynamic mic?
> 
> 73
> Paul
> w2eck
> 
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Re: [Elecraft] CM500 Mic ?

[Bob McGraw K4TAX]

Yes but..when one looks at the SPECS  one will see "Microphone 
Type:    Dynamic".    I guess one could consider that to be "electric".


73

Bob, K4TAX


On 1/28/2019 8:19 PM, j...@kk9a.com wrote:

The manufacture says it is a sensitive electric microphone:
https://usa.yamaha.com/products/music_production/accessories/cm500/index.htm
l

So does Amazon:
https://www.amazon.com/Yamaha-CM500-Headset-Built-Microphone/dp/B000BZ6ZX0/r
ef=sr_1_1?ie=UTF8=1548727771=8-1=yamaha+cm500

Perhaps that translates to Electret:)

John KK9A



Paul Ecker W2ECK wrote:

Does anyone know if the CM500 has a Electret or Dynamic mic?

73
Paul
w2eck

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Re: [Elecraft] CM500 Mic ?

[john]

The manufacture says it is a sensitive electric microphone:
https://usa.yamaha.com/products/music_production/accessories/cm500/index.htm
l 

So does Amazon:
https://www.amazon.com/Yamaha-CM500-Headset-Built-Microphone/dp/B000BZ6ZX0/r
ef=sr_1_1?ie=UTF8=1548727771=8-1=yamaha+cm500

Perhaps that translates to Electret:)

John KK9A



Paul Ecker W2ECK wrote: 

Does anyone know if the CM500 has a Electret or Dynamic mic?

73
Paul
w2eck

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Re: [Elecraft] CM500 Mic ?

[Bob McGraw K4TAX]

Yes I always find it interesting they include a battery pak but say it's 
dynamic.   Most all of the descriptions I've seen indicate it is a dynamic 
mike.  No it's an Electrect element. 

Bob, K4TAX


Sent from my iPhone

> On Jan 28, 2019, at 4:07 PM, Mike - W5JR  wrote:
> 
> That explains where that battery pack came from!! I’d forgotten how I had 
> acquired the adapter. 
> 
> tnx
> Mike / W5JR
> Alpharetta GA
> 
> 
>> On Jan 28, 2019, at 2:52 PM, Walter Underwood  wrote:
>> 
>> The published docs on the CM500 are a mess, but it is an electret. It even 
>> comes with a battery pack so you can use it with non-powered mic jacks.
>> 
>> wunder
>> K6WRU
>> Walter Underwood
>> CM87wj
>> http://observer.wunderwood.org/ (my blog)
>> 
>>> On Jan 28, 2019, at 11:44 AM, Paul Ecker  wrote:
>>> 
>>> Don - thank you. That was exactly the reason I wanted to double check. I
>>> saw an ad on the internet saying dynamic.
>>> 
>>> Tnx agn & 73
>>> Paul
>>> w2eck
>>> 
 On Mon, Jan 28, 2019 at 2:33 PM Don Wilhelm  wrote:
 
 Paul,
 
 While I have seen ads saying it has a dynamic element, that is not the
 case - it is an electret type.
 
 I believe it was designed to be a microphone you could plug into a
 computer, and all of those are electret types.
 
 73,
 Don W3FPR
 
 
> On 1/28/2019 2:26 PM, Paul Ecker wrote:
> Does anyone know if the CM500 has a Electret or Dynamic mic?
> 
 
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Re: [Elecraft] CM500 Mic ?

[Mike - W5JR]

That explains where that battery pack came from!! I’d forgotten how I had 
acquired the adapter. 

tnx
Mike / W5JR
Alpharetta GA


> On Jan 28, 2019, at 2:52 PM, Walter Underwood  wrote:
> 
> The published docs on the CM500 are a mess, but it is an electret. It even 
> comes with a battery pack so you can use it with non-powered mic jacks.
> 
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
> 
>> On Jan 28, 2019, at 11:44 AM, Paul Ecker  wrote:
>> 
>> Don - thank you. That was exactly the reason I wanted to double check. I
>> saw an ad on the internet saying dynamic.
>> 
>> Tnx agn & 73
>> Paul
>> w2eck
>> 
>>> On Mon, Jan 28, 2019 at 2:33 PM Don Wilhelm  wrote:
>>> 
>>> Paul,
>>> 
>>> While I have seen ads saying it has a dynamic element, that is not the
>>> case - it is an electret type.
>>> 
>>> I believe it was designed to be a microphone you could plug into a
>>> computer, and all of those are electret types.
>>> 
>>> 73,
>>> Don W3FPR
>>> 
>>> 
 On 1/28/2019 2:26 PM, Paul Ecker wrote:
 Does anyone know if the CM500 has a Electret or Dynamic mic?
 
>>> 
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Re: [Elecraft] CM500 Mic ?

[Bob McGraw K4TAX]

Just goes to show, one can't believe what they read on the internet.

73

Bob, K4TAX




On 1/28/2019 1:52 PM, Walter Underwood wrote:

The published docs on the CM500 are a mess, but it is an electret. It even 
comes with a battery pack so you can use it with non-powered mic jacks.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)


On Jan 28, 2019, at 11:44 AM, Paul Ecker  wrote:

Don - thank you. That was exactly the reason I wanted to double check. I
saw an ad on the internet saying dynamic.

Tnx agn & 73
Paul
w2eck

On Mon, Jan 28, 2019 at 2:33 PM Don Wilhelm  wrote:


Paul,

While I have seen ads saying it has a dynamic element, that is not the
case - it is an electret type.

I believe it was designed to be a microphone you could plug into a
computer, and all of those are electret types.

73,
Don W3FPR


On 1/28/2019 2:26 PM, Paul Ecker wrote:

Does anyone know if the CM500 has a Electret or Dynamic mic?


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Re: [Elecraft] CM500 Mic ?

[Walter Underwood]

If you are using a KX2 or KX3, you’ll get logic bias as well as mic bias on the 
CM500 mic. If you separate out the mic bias, you’ll get more and cleaner 
output. A stereo to L/R splitter will do that job, plus it breaks out the PTT 
line. I wrote that up on my blog.

https://observer.wunderwood.org/2015/08/16/yamaha-cm500-headset-with-ptt-on-elecraft-kx3/
 


wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 28, 2019, at 11:52 AM, Walter Underwood  wrote:
> 
> The published docs on the CM500 are a mess, but it is an electret. It even 
> comes with a battery pack so you can use it with non-powered mic jacks.
> 
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
> 
>> On Jan 28, 2019, at 11:44 AM, Paul Ecker  wrote:
>> 
>> Don - thank you. That was exactly the reason I wanted to double check. I
>> saw an ad on the internet saying dynamic.
>> 
>> Tnx agn & 73
>> Paul
>> w2eck
>> 
>> On Mon, Jan 28, 2019 at 2:33 PM Don Wilhelm  wrote:
>> 
>>> Paul,
>>> 
>>> While I have seen ads saying it has a dynamic element, that is not the
>>> case - it is an electret type.
>>> 
>>> I believe it was designed to be a microphone you could plug into a
>>> computer, and all of those are electret types.
>>> 
>>> 73,
>>> Don W3FPR
>>> 
>>> 
>>> On 1/28/2019 2:26 PM, Paul Ecker wrote:
 Does anyone know if the CM500 has a Electret or Dynamic mic?
 
>>> 
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Re: [Elecraft] CM500 Mic ?

[Walter Underwood]

The published docs on the CM500 are a mess, but it is an electret. It even 
comes with a battery pack so you can use it with non-powered mic jacks.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 28, 2019, at 11:44 AM, Paul Ecker  wrote:
> 
> Don - thank you. That was exactly the reason I wanted to double check. I
> saw an ad on the internet saying dynamic.
> 
> Tnx agn & 73
> Paul
> w2eck
> 
> On Mon, Jan 28, 2019 at 2:33 PM Don Wilhelm  wrote:
> 
>> Paul,
>> 
>> While I have seen ads saying it has a dynamic element, that is not the
>> case - it is an electret type.
>> 
>> I believe it was designed to be a microphone you could plug into a
>> computer, and all of those are electret types.
>> 
>> 73,
>> Don W3FPR
>> 
>> 
>> On 1/28/2019 2:26 PM, Paul Ecker wrote:
>>> Does anyone know if the CM500 has a Electret or Dynamic mic?
>>> 
>> 
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Re: [Elecraft] CM500 Mic ?

[Paul Ecker]

Don - thank you. That was exactly the reason I wanted to double check. I
saw an ad on the internet saying dynamic.

Tnx agn & 73
Paul
w2eck

On Mon, Jan 28, 2019 at 2:33 PM Don Wilhelm  wrote:

> Paul,
>
> While I have seen ads saying it has a dynamic element, that is not the
> case - it is an electret type.
>
> I believe it was designed to be a microphone you could plug into a
> computer, and all of those are electret types.
>
> 73,
> Don W3FPR
>
>
> On 1/28/2019 2:26 PM, Paul Ecker wrote:
> > Does anyone know if the CM500 has a Electret or Dynamic mic?
> >
>
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Re: [Elecraft] CM500 Mic ?

[Don Wilhelm]

Paul,

While I have seen ads saying it has a dynamic element, that is not the 
case - it is an electret type.


I believe it was designed to be a microphone you could plug into a 
computer, and all of those are electret types.


73,
Don W3FPR


On 1/28/2019 2:26 PM, Paul Ecker wrote:

Does anyone know if the CM500 has a Electret or Dynamic mic?


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Re: [Elecraft] CM500 Mic ?

[Bob McGraw K4TAX]

I recall that it is Electrect.  Should plug in direct on the back panel 
of the radio.  Just turn on the BIAS.


73

Bob, K4TAX

On 1/28/2019 1:26 PM, Paul Ecker wrote:

Does anyone know if the CM500 has a Electret or Dynamic mic?

73
Paul
w2eck
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[Elecraft] CM500 Mic ?

[Paul Ecker]

Does anyone know if the CM500 has a Electret or Dynamic mic?

73
Paul
w2eck
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[Elecraft] CM500 for sale for K3

[Rick Stealey]

If anyone in EU or VK/ZL is having trouble finding a CM500 locally please 
contact me off list.  This is the headset with attached microphone for the K3.  
I have one unused available.

Rick  K2XT
  
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[Elecraft] CM500 headset suggestion

[Ralph Parker]

Gee, what if Elecraft was to do a bulk buy of the CM500, and make them
available along with the other K3 parts/accessories? Might be convenient.
Just thinking...

Ralph, VE7XF

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[Elecraft] CM500 mic connections

[Allen Griffith]

Thanks for the multiple replies.  Y'all make life easier!!

 

73,
GriffN5AG
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[Elecraft] CM500 Mic

[W0MU Mike Fatchett]

I just got a pair of the CM500's and they work pretty good.

My mic setting is on 3 to keep from over driving the alc on the radio.  
Is this normal for this mic.  I have Low Z selected and Bias.  My Heil 
elements the mic gain is much higher.

-- 
Mike W0MU

J6M CQ WW DX CW Contest 2011
J6/W0MU November 21 - December 1 2011
W0MU-1 CC Cluster w0mu.net

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Re: [Elecraft] CM500 Mic

[Jim Brown]

On 11/10/2011 3:42 PM, W0MU Mike Fatchett wrote:
 I just got a pair of the CM500's and they work pretty good.

 My mic setting is on 3 to keep from over driving the alc on the radio.
 Is this normal for this mic.  I have Low Z selected and Bias.  My Heil
 elements the mic gain is much higher.

Yes, it is pretty normal, because the mic in the CM500 is a pretty hot 
mic (that is, high output).  By all means, follow the standard setup 
instructions in the manual. One thing you MIGHT want to change is TXEQ.  
For virtually all voices, the two lowest bands should be down all the 
way, and for most voices, the third band should be down between 6dB and 
all the way.  The rest of the bands should usually be set flat, except 
that those with very muddy voices may want to boost the top band 3-6 
dB.  I usually run compression so that I consistently see about 10dB 
compression on peaks (on the K3 display).

The best way to get a final setting on TXEQ, mic gain, and compression, 
is to have someone listen to you on a K3 with their IF bandwidth set to 
at least 2.7 kHz.  What they should hear is good clean audio, but with 
very little low end (bass).

73, Jim K9YC
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Re: [Elecraft] CM500 headphones

[Iain]

Same problem here in UK, unavailable.

Amazon US seem able to ship to UK and probably elsewhere though, just 
ordered one.


G4SGX
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[Elecraft] CM500 headphone (was: CQ WW SSB)

[Johnny Siu]

Thanks to all replies in relation to the purchase of CM500.

 73,


Johnny VR2XMC



從︰ Andy Wood vk...@woodtech.net.au
收件人︰ elecraft@mailman.qth.net
傳送日期︰ 2011年11月1日 (週二) 3:17 PM
主題︰ Re: [Elecraft] CQ WW SSB

I used the Yamaha CM500 from my colleage VO1AU which was very good.  I
cannot get a CM500 in VR2, could any of you advise where I can get a CM500
in USA?
 
--

Hi Johnny,

I purchased some from here some time back. No problems with credit card or
shipping to Australia:

http://www.andysmusic.com/SearchResults.asp?search=cm500imageField.x=0imageField.y=0

Andy  VK4KY

--
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Re: [Elecraft] CM500 headphone (was: CQ WW SSB)

[Adrian]

I used?the Yamaha CM500 from my colleage VO1AU which was very good.? I
cannot get a CM500 in VR2, could any of you advise where I can get a CM500
in USA?
?
--
There are USA eBay sellers who now sell the CM-500 international. Purchased
a 2nd set this way recently for a spare.
I tried the Turtlebeach Z1 without much luck due to overhead rf distortion
despite ferrites fitted. (There is no rf return on the feedline).
Gave it to the kids for their computers.
The CM-500 maintains it's No 1 position for me after trying 20 different mic
types including Heil and Shure.


Adrian ... vk4tux


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Re: [Elecraft] CM500 headphone (was: CQ WW SSB)

[Jim Lawrence]

They are available here in the USA at:

http://www.samash.com/p/Yamaha_CM500%20Headphones%20with%20Microphone_-49969
751

Jim W7CT



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Adrian
Sent: Tuesday, November 01, 2011 1:23 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] CM500 headphone (was: CQ WW SSB)



I used?the Yamaha CM500 from my colleage VO1AU which was very good.? I
cannot get a CM500 in VR2, could any of you advise where I can get a CM500
in USA?
?
--
There are USA eBay sellers who now sell the CM-500 international. Purchased
a 2nd set this way recently for a spare.
I tried the Turtlebeach Z1 without much luck due to overhead rf distortion
despite ferrites fitted. (There is no rf return on the feedline).
Gave it to the kids for their computers.
The CM-500 maintains it's No 1 position for me after trying 20 different mic
types including Heil and Shure.


Adrian ... vk4tux


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Re: [Elecraft] CM500 headphone (was: CQ WW SSB)

[N2TK, Tony]

CM-500 much more comfortable than Heil Pro set wearing it an entire contest
weekend. And no matter how I try to set up the transmit equalizer for both
headsets I get reports of more penetrating audio from the CM-500. 
We just ran a pair of K3's at WP2Z this past weekend.

73,
N2TK/NP2, Tony


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Adrian
Sent: Tuesday, November 01, 2011 3:23 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] CM500 headphone (was: CQ WW SSB)



I used?the Yamaha CM500 from my colleage VO1AU which was very good.? I
cannot get a CM500 in VR2, could any of you advise where I can get a CM500
in USA?
?
--
There are USA eBay sellers who now sell the CM-500 international. Purchased
a 2nd set this way recently for a spare.
I tried the Turtlebeach Z1 without much luck due to overhead rf distortion
despite ferrites fitted. (There is no rf return on the feedline).
Gave it to the kids for their computers.
The CM-500 maintains it's No 1 position for me after trying 20 different mic
types including Heil and Shure.


Adrian ... vk4tux


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Re: [Elecraft] CM500 headphone (was: CQ WW SSB)

[Adrian]

I used?the Yamaha CM500 from my colleage VO1AU which was very good.? I
cannot get a CM500 in VR2, could any of you advise where I can get a CM500
in USA?
?
--
There are USA eBay sellers who now sell the CM-500 international. Purchased
a 2nd set this way recently for a spare.
I tried the Turtlebeach Z1 without much luck due to overhead rf distortion
despite ferrites fitted. (There is no rf return on the feedline).
Gave it to the kids for their computers.
The CM-500 maintains it's No 1 position for me after trying 20 different mic
types including Heil and Shure.


Adrian ... vk4tux

Just to add I purchased mine from; closeouthun...@charter.net


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[Elecraft] CM500

[Tommy Alderman]

SOMEWHERE in my pile of papers I have a CM500 headset owners paper! 
Can someone please tell me what the tip and ring connection are for the
microphone? I assume the base is the ground connection.
Thanks.
Tom - W4BQF

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Re: [Elecraft] CM500

[Jim Brown]

On 1/13/2011 8:24 AM, Tommy Alderman wrote:
 SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
 Can someone please tell me what the tip and ring connection are for the
 microphone? I assume the base is the ground connection.

Audio appears between tip and shell. As nearly as I have been able to 
determine, the ring contact is not used at all. Tip also needs a 
resistor (about 5K ohms) to V+. Turning on bias in the K3 does this 
internally, so no resistor is needed.  I had to add the resistor in an 
adapter that I built to use with an FT1000MP at PJ4.  The bias resistor 
is also built into the mic input of most modern computer sound cards. 
The CM500 works just fine in my Thinkpads.

73, Jim K9YC
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Re: [Elecraft] CM500

[Mark n2qt]

nice write up on sound card microphones (like in the CM500) at

http://www.hobby-hour.com/electronics/computer_microphone.php

My CM500 just came today, haven't confirmed anything yet.

Mark n2qt

-Original Message- 
From: Jim Brown 
Sent: Thursday, January 13, 2011 1:37 PM 
To: elecraft@mailman.qth.net 
Subject: Re: [Elecraft] CM500 

On 1/13/2011 8:24 AM, Tommy Alderman wrote:
 SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
 Can someone please tell me what the tip and ring connection are for the
 microphone? I assume the base is the ground connection.

Audio appears between tip and shell. As nearly as I have been able to 
determine, the ring contact is not used at all. Tip also needs a 
resistor (about 5K ohms) to V+. Turning on bias in the K3 does this 
internally, so no resistor is needed.  I had to add the resistor in an 
adapter that I built to use with an FT1000MP at PJ4.  The bias resistor 
is also built into the mic input of most modern computer sound cards. 
The CM500 works just fine in my Thinkpads.

73, Jim K9YC
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Re: [Elecraft] CM500

[n6lrv]

Tom,
I recently bought a CM500 new and it did not include any papers at all however 
the headset's wiring reflects a standard used in computer sound cards. The mic 
jack/plug is usually wired as follows;
tip- mic signal
ring- bias voltage (optional)
sleeve- ground

Hope this helps.
Gary
N6LRV
 Tommy Alderman alderm...@windstream.net wrote: 
 SOMEWHERE in my pile of papers I have a CM500 headset owners paper! 
 Can someone please tell me what the tip and ring connection are for the
 microphone? I assume the base is the ground connection.
 Thanks.
 Tom - W4BQF
 

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Re: [Elecraft] CM500 Speaker / Headphone

[Mike Harris]

Or you could just simply assign CONFIG: SPKR+PH to a PF key, it 
toggles.  Works for me.

Mike VP8NO

- Original Message - 
From: Roger Gagos k...@arrl.net
To: elecraft@mailman.qth.net
Sent: Thursday, January 13, 2011 5:30 PM
Subject: [Elecraft] CM500 Speaker / Headphone


I found I can leave  the CM500 phones plugged in rear  jack by 
writing a
 simple macro to turn speakers on or off and assigning it to the 
 PF1 key.
 Email me direct if more info would be useful.
 -
Using the headphones from the FP allows for easier access to the 
headphone
 jack
when switching between speakers and headset.
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No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.872 / Virus Database: 271.1.1/3376 - Release Date: 
01/12/11 16:34:00

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Re: [Elecraft] CM500

[Tommy Alderman]

Thanks for the several responses. They were all helpful.

73,
Tom - W4BQF


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Tommy Alderman
Sent: Thursday, January 13, 2011 11:25 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] CM500

SOMEWHERE in my pile of papers I have a CM500 headset owners paper! 
Can someone please tell me what the tip and ring connection are for the
microphone? I assume the base is the ground connection.
Thanks.
Tom - W4BQF


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Re: [Elecraft] CM500

[Igor Kosvin]

I just checked my CM500. It appears that tip and ring are shorted together.
73,
Igor, N1YX

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of n6...@cox.net
Sent: Thursday, January 13, 2011 3:20 PM
To: Tommy Alderman; elecraft@mailman.qth.net
Subject: Re: [Elecraft] CM500

Tom,
I recently bought a CM500 new and it did not include any papers at all
however the headset's wiring reflects a standard used in computer sound
cards. The mic jack/plug is usually wired as follows;
tip- mic signal
ring- bias voltage (optional)
sleeve- ground

Hope this helps.
Gary
N6LRV
 Tommy Alderman alderm...@windstream.net wrote: 
 SOMEWHERE in my pile of papers I have a CM500 headset owners paper! 
 Can someone please tell me what the tip and ring connection are for the
 microphone? I assume the base is the ground connection.
 Thanks.
 Tom - W4BQF
 

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Re: [Elecraft] CM500

[Don Wilhelm]

  Al the more reason to use only the tip and the sleeve.
The K3 jacks are 'stereo', which indicates that a stereo cable will work 
just fine and cause no additional problems. Since the K3 does not use 
the ring contact, it makes no difference whether the tip and ring are 
connected or not - the K3 ignores the ring contact.

I am not certain about your situation, but as I understand,in the case 
of the CM500, the tip is the active AF signal, and the shell is the 
return (ground).  The mono input of the K3 rear panel mic jack will work 
just fine as long as bias is turned on.  If the front panel mic input is 
the choice, an adapter to a Foster plug is required and bias will have 
to be turned on.

73,
Don W3FPR

On 1/13/2011 8:57 PM, Igor Kosvin wrote:
 I just checked my CM500. It appears that tip and ring are shorted together.
 73,
 Igor, N1YX

 -Original Message-
 From:elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf ofn6...@cox.net
 Sent: Thursday, January 13, 2011 3:20 PM
 To: Tommy Alderman;elecraft@mailman.qth.net
 Subject: Re: [Elecraft] CM500

 Tom,
 I recently bought a CM500 new and it did not include any papers at all
 however the headset's wiring reflects a standard used in computer sound
 cards. The mic jack/plug is usually wired as follows;
 tip- mic signal
 ring- bias voltage (optional)
 sleeve- ground

 Hope this helps.
 Gary
 N6LRV
  Tommy Aldermanalderm...@windstream.net  wrote:
 SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
 Can someone please tell me what the tip and ring connection are for the
 microphone? I assume the base is the ground connection.
 Thanks.
 Tom - W4BQF

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Re: [Elecraft] CM500

[Don Wilhelm]

  Al the more reason to use only the tip and the sleeve.
The K3 jacks are 'stereo', which indicates that a stereo cable will work 
just fine and cause no additional problems.

I am not certain about your situation, I as I understand,m ln/

On 1/13/2011 8:57 PM, Igor Kosvin wrote:
 I just checked my CM500. It appears that tip and ring are shorted together.
 73,
 Igor, N1YX

 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of n6...@cox.net
 Sent: Thursday, January 13, 2011 3:20 PM
 To: Tommy Alderman; elecraft@mailman.qth.net
 Subject: Re: [Elecraft] CM500

 Tom,
 I recently bought a CM500 new and it did not include any papers at all
 however the headset's wiring reflects a standard used in computer sound
 cards. The mic jack/plug is usually wired as follows;
 tip- mic signal
 ring- bias voltage (optional)
 sleeve- ground

 Hope this helps.
 Gary
 N6LRV
  Tommy Aldermanalderm...@windstream.net  wrote:
 SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
 Can someone please tell me what the tip and ring connection are for the
 microphone? I assume the base is the ground connection.
 Thanks.
 Tom - W4BQF

 __
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Re: [Elecraft] CM500

[Gary]

Igor,
That is normal for an electret mic like the one used in the CM500 headset.
Gary
N6LRV

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Igor Kosvin
Sent: Thursday, January 13, 2011 5:57 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] CM500

I just checked my CM500. It appears that tip and ring are shorted together.
73,
Igor, N1YX


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Re: [Elecraft] Cm500 and TX EQ settings

[Jeff Hall (W6UX)]

Mike,

I messed around with the TX EQ for over an hour yesterday, I've settled on
these settings for now (this sounded less nasal and not too much like I
had a pillow over my face)

*50 Hz @ -16dB*
*100 Hz @ -16dB*
*200 Hz @ -6dB*
*400 Hz @ +8dB*
800 Hz @ +0dB
1600 Hz @ +0dB
2400 Hz @ +0dB
3200 Hz @ +0dB

*Mic: 30* (for 5-7 bars with a steady a)
*Cmp: 20* (10dB on the CMP meter)

It could be that my voice just wasn't meant for radio (good thing I didn't
try to break into broadcasting!).

I left the lows way down per recommendations from Jim Brown.  I'm just
trying to find a comfortable setting for ragchews.  For contesting I'll
probably drop the 3 lows to -16dB and leave the rest at +0dB.

My RX EQ is flat; so I'm probably not hearing my TX EQ settings the way
others do.  Got a couple reports last night that the audio was nice and
clear.  Not sure if that means comfy for extended listening though.

CCing the reflector for more opinions on my new settings

73
Jeff W6UX

--
*From:* Mike Rodgers mikerodgerske5...@yahoo.com
*To:* w...@arrl.net w...@arrl.net
*Sent:* Tue, December 21, 2010 9:23:11 AM
*Subject:* Cm500

Your setting look out of character for what I've seen. That should have no
lows or highs. You should not need anything external from what I've read.
I do not have a k3 yet but have been collecting much info.
I have a collection of settings at home.

73

I saw it on the radio!

Happy QSO'ing.  Mike R
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[Elecraft] CM500 mic keeps cutting out midsentence

[Jeff Hall (W6UX)]

I'm having problems preventing my Yamaha CM500 boom mic from cutting out
intermittently while talking.  I have the following settings on my K3:

VOX Gain: 85
Anti-vox: 0
Mic delay: 0.90
Mic Gain: 30
Cmp: 25

The mic is routed to the K3 via a microHam MKII.

I have tried moving the mic to various positions but this doesn't help.  TX
cuts out every few words and this is very annoying! I have to raise my voice
above normal conversation levels to get it to turn the transmitter on.  I've
play around with various values, but I'm not finding a good combination.  Is
there another setting I have forgot to address? Maybe I've got a loose
connection in the mic itself? Not sure how to take this apart for
inspection.

Thanks for any any and all suggestions!

Jeff, W6UX
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Re: [Elecraft] CM500 mic keeps cutting out midsentence

[Ron D'Eau Claire]

Zero VOX Gain should mean that *any* sound picked up by the mic should
initiate transmit.

The Mic delay means that when VOX does drop out, there's a 0.9 second delay
before it reasserts after the mic picks up sounds. You might try reducing
that to see if there's any effect. 

Presumably you are seeing 5 to 7 bars of ALC on the bargraph indicating
normal mic audio levels into the K3. 

Try connecting the mic direct without the Microham to eliminate the Microham
interface.

Try transmitting PTT to determine whether it's the VOX setup or an
intermittent in the mic wiring.

Ron AC7AC

-Original Message-
I'm having problems preventing my Yamaha CM500 boom mic from cutting out
intermittently while talking.  I have the following settings on my K3:

VOX Gain: 85
Anti-vox: 0
Mic delay: 0.90
Mic Gain: 30
Cmp: 25

The mic is routed to the K3 via a microHam MKII.

I have tried moving the mic to various positions but this doesn't help.  TX
cuts out every few words and this is very annoying! I have to raise my voice
above normal conversation levels to get it to turn the transmitter on.  I've
play around with various values, but I'm not finding a good combination.  Is
there another setting I have forgot to address? Maybe I've got a loose
connection in the mic itself? Not sure how to take this apart for
inspection.

Thanks for any any and all suggestions!

Jeff, W6UX

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Re: [Elecraft] CM500 mic keeps cutting out midsentence

[David Gilbert]

Why not connect the mic directly to the sound card of your computer to 
see if it is the problem or not?  Trial-and-error on everything at once 
is not a very good trouble shooting methodology.

73,
Dave   AB7E



On 12/19/2010 1:22 PM, Jeff Hall (W6UX) wrote:
 I'm having problems preventing my Yamaha CM500 boom mic from cutting out
 intermittently while talking.  I have the following settings on my K3:

 VOX Gain: 85
 Anti-vox: 0
 Mic delay: 0.90
 Mic Gain: 30
 Cmp: 25

 The mic is routed to the K3 via a microHam MKII.

 I have tried moving the mic to various positions but this doesn't help.  TX
 cuts out every few words and this is very annoying! I have to raise my voice
 above normal conversation levels to get it to turn the transmitter on.  I've
 play around with various values, but I'm not finding a good combination.  Is
 there another setting I have forgot to address? Maybe I've got a loose
 connection in the mic itself? Not sure how to take this apart for
 inspection.

 Thanks for any any and all suggestions!

 Jeff, W6UX
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Re: [Elecraft] CM500 mic keeps cutting out midsentence

[Tommy Alderman]

 Zero VOX Gain should mean that *any* sound picked up by the mic should
initiate transmit.  ???

I always thought zero meant NO - so you are saying if you turn the VOX
Gain down to zero, you're  going to be able to hear a flea sneeze?

Or did you mis-read what Jeff actually said?

MC  HNY

Tom - W4BQF



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron D'Eau Claire
Sent: Sunday, December 19, 2010 4:05 PM
To: 'Jeff Hall (W6UX)'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] CM500 mic keeps cutting out midsentence

Zero VOX Gain should mean that *any* sound picked up by the mic should
initiate transmit.

The Mic delay means that when VOX does drop out, there's a 0.9 second delay
before it reasserts after the mic picks up sounds. You might try reducing
that to see if there's any effect. 

Presumably you are seeing 5 to 7 bars of ALC on the bargraph indicating
normal mic audio levels into the K3. 

Try connecting the mic direct without the Microham to eliminate the Microham
interface.

Try transmitting PTT to determine whether it's the VOX setup or an
intermittent in the mic wiring.

Ron AC7AC

-Original Message-
I'm having problems preventing my Yamaha CM500 boom mic from cutting out
intermittently while talking.  I have the following settings on my K3:

VOX Gain: 85
Anti-vox: 0
Mic delay: 0.90
Mic Gain: 30
Cmp: 25

The mic is routed to the K3 via a microHam MKII.

I have tried moving the mic to various positions but this doesn't help.  TX
cuts out every few words and this is very annoying! I have to raise my voice
above normal conversation levels to get it to turn the transmitter on.  I've
play around with various values, but I'm not finding a good combination.  Is
there another setting I have forgot to address? Maybe I've got a loose
connection in the mic itself? Not sure how to take this apart for
inspection.

Thanks for any any and all suggestions!

Jeff, W6UX

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Re: [Elecraft] CM500 mic keeps cutting out midsentence

[Ron D'Eau Claire]

The owner's manual says MAIN:VOX GN (VOX gain) should be set to trigger at
normal speech level, but not in response to incidental noise. Start with low
settings (5-10). 

I didn't write that text. I assumed it was saying to start with low settings
to ensure the VOX would trigger reliably and raise it as needed to avoid
false triggering. 

Maybe a bad assumption :-) 

Ron AC7AC

-Original Message-
 Zero VOX Gain should mean that *any* sound picked up by the mic should
initiate transmit.  ???

I always thought zero meant NO - so you are saying if you turn the VOX
Gain down to zero, you're  going to be able to hear a flea sneeze?

Or did you mis-read what Jeff actually said?

MC  HNY

Tom - W4BQF


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Re: [Elecraft] CM500 mic keeps cutting out midsentence

[Jeff Cochrane - VK4BOF]

I use the following settings with my CM500 and my K3.
Mic Sel - RPL Bias
Antivox - 015
Xox Gn - 025
Mic Delay 0.50
Mic Gain  10
Cmp 20
You may need to increase the microphone gain setting to suit your voice.

I hope this helps.

Jeff Cochrane - VK4BOF
Innisfail, QLD, Australia
Elecraft K3# 4257

  - Original Message - 
  From: Ron D'Eau Claire 
  To: 'Tommy Alderman' ; elecraft@mailman.qth.net 
  Sent: Monday, December 20, 2010 9:22 AM
  Subject: Re: [Elecraft] CM500 mic keeps cutting out midsentence


  The owner's manual says MAIN:VOX GN (VOX gain) should be set to trigger at
  normal speech level, but not in response to incidental noise. Start with low
  settings (5-10). 

  I didn't write that text. I assumed it was saying to start with low settings
  to ensure the VOX would trigger reliably and raise it as needed to avoid
  false triggering. 

  Maybe a bad assumption :-) 

  Ron AC7AC

  -Original Message-
   Zero VOX Gain should mean that *any* sound picked up by the mic should
  initiate transmit.  ???

  I always thought zero meant NO - so you are saying if you turn the VOX
  Gain down to zero, you're  going to be able to hear a flea sneeze?

  Or did you mis-read what Jeff actually said?

  MC  HNY

  Tom - W4BQF


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[Elecraft] CM500 Headset for Sale

[Dave Perry N4QS]

FOR SALE:  Yamaha CM500 headset with built-in microphone.  Brand new.  
Purchased from BH last week.

$45.00  -- includes shipping via Fed Ex Ground.  I paid $44.39 plus shipping.

I will accept a personal check.

Dave, N4QS

K3 #3122
P3 #  289
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Re: [Elecraft] CM500 Headset for Sale

[Dave Perry N4QS]

To all,

The CM500 headset has been sold to W6NIA the first responder.  Thanks for 
all of the interest.

BTW, several have asked why I was selling the headset.  I bought it thinking 
that it would replace my old Heil BM-10 headset.  In comparing both with the 
K3, I found that I still preferred the Heil with the HC5 element.  The Heil 
seems to respond better to my voice and was easier to configure for Vox 
Gain, Anti-Vox. etc.  Since there was no overwhelming improvement in the 
Yamaha versus the Heil, I thought I would stick with the tried and true. 
Plus the BM-10 is very comfortable to wear if you do not have to block out 
outside noise--which I don't in my shack.  I think the Yamaha is still a 
very good value especially if you do not already have a headset.

Dave, N4QS

- Original Message - 
From: Dave Perry N4QS n...@comcast.net
To: 'Elecraft Reflector' elecraft@mailman.qth.net
Sent: Monday, September 06, 2010 1:33 PM
Subject: [Elecraft] CM500 Headset for Sale


 FOR SALE:  Yamaha CM500 headset with built-in microphone.  Brand new. 
 Purchased from BH last week.

 $45.00  -- includes shipping via Fed Ex Ground.  I paid $44.39 plus 
 shipping.

 I will accept a personal check.

 Dave, N4QS

 K3 #3122
 P3 #  289
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Re: [Elecraft] CM500 Headset for Sale

[Bob]

I have seen so such about this headset that I finally couldn't resist 
any longer.

Thursday I ordered one from Sam Ash for $44.99 including shipping.  The 
online ad
said it was out of stock but I ordered it anyway as there was no rush. 
Late Friday  I
got an e-mail with a FedEx number.  Today I got an automated phone call also
confirming shipment.

So if anyone missed the posted ones here Sam Ash might be worth a try.  
You can
always cancel if an excessive  delay is encountered.

73,
Bob
K2TK

On 9/6/2010 5:16 PM, Dave Perry N4QS wrote:
 To all,

 The CM500 headset has been sold to W6NIA the first responder.  Thanks for
 all of the interest.

 BTW, several have asked why I was selling the headset.  I bought it thinking
 that it would replace my old Heil BM-10 headset.  In comparing both with the
 K3, I found that I still preferred the Heil with the HC5 element.  The Heil
 seems to respond better to my voice and was easier to configure for Vox
 Gain, Anti-Vox. etc.  Since there was no overwhelming improvement in the
 Yamaha versus the Heil, I thought I would stick with the tried and true.
 Plus the BM-10 is very comfortable to wear if you do not have to block out
 outside noise--which I don't in my shack.  I think the Yamaha is still a
 very good value especially if you do not already have a headset.

 Dave, N4QS

 - Original Message -
 From: Dave Perry N4QSn...@comcast.net
 To: 'Elecraft Reflector'elecraft@mailman.qth.net
 Sent: Monday, September 06, 2010 1:33 PM
 Subject: [Elecraft] CM500 Headset for Sale



 FOR SALE:  Yamaha CM500 headset with built-in microphone.  Brand new.
 Purchased from BH last week.

 $45.00  -- includes shipping via Fed Ex Ground.  I paid $44.39 plus
 shipping.

 I will accept a personal check.

 Dave, N4QS

 K3 #3122
 P3 #  289

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[Elecraft] CM500

[David Dunn]

On the strength of the highly commended postings about the CM 500,   I told
a very good friend in Spain,   Hal,   EA5SX/ G3NMH and he has tried to find
a source in USA to buy one.   There are several of course. To date not one
will ship to Spain  (or out of USA)   This seems most odd in this day and
age.
This is a tentative enquiry, as there are a few
fields not yet expolored. Would anyone  preferably in W5 region, be
willing to help out,  Hal will pay all costs of course.

   Thanks   David
VK3DBD/G3SCD
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[Elecraft] CM500 Powering from K2

[Jim Brown]

A week or so ago, KS4L asked for info on powering the CM500 from 
his K2. He tried the instructions I gave, but it didn't work. Bear 
in mind here that several variations of output stages are used for 
the FET impedance converter in electret mics, and not all mfrs wire 
them the same way to their plugs. For this reason, a single 
powering method doesn't work for all electret mics. We learned this 
two decades ago in the pro audio world when we started using 
lavalier (clip-on) mics with wireless mic transmitters, and every 
mfr of both mics and wireless systems published lots of info about 
how to hook their stuff up. 

The CM500 works directly with the K3, so I looked at what the K3 
does for power. It's 5.6K to the tip only. The K3 makes no 
connection to the ring. Randy tried that and it works fine. 

So -- revised advice. From the CM500 mic plug, wire the tip to the 
mic input, add a 5.6K resistor between +DC on the K2 mic jack and 
the mic input. The resistor value is not critical, 4.7K to 8.2K 
should work fine. There is very little current, so very small 
resistors are fine. The sleeve (common) of the plug goes to common 
at the mic jack. 

The same wiring should work with this mic for nearly all other ham 
rigs. 

I would expect the CM500 to work really well with the K2. One of 
the few shortcomings of the K2 is that since it was originally 
designed as a QRP CW rig, the support for SSB is not a strong 
point. One way this shows up is in relatively low audio gain and 
not enough LF rolloff. The CM500 helps this situation, first 
because it's a pretty hot mic (that is, higher than average 
output level) and because the low end is rolled off internally. 

There are several published mods to improve the gain of the SSB 
signal chain, some of which go all the way to the RF end of the 
chain. I took the simpler approach, modifying my K2s by changing a 
few resistors and capacitors in the mic stages to provide rolloff 
around 500 Hz and increase the gain by about 7dB. This allows the 
mic to hit the compressor harder (and the rolloff prevents low 
frequency sounds from hitting the compressor), making the audio 
more competitive. The CM500 should provide the same improvements 
but without the mods. 

73,

Jim Brown K9YC



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Re: [Elecraft] CM500 Powering from K2

[David Y.]

Jim and All,

The K3 provides the necessary bias through a menu setting.  The K2 requires 
an internal adjustment for whatever type microphone you are using, and how 
the 8 pin connector is wired.  I think all this is covered in the manual, 
but the bottom line is that for electrets, a resistor is added on the 
internal microphone wiring terminal which goes from the bias voltage supply 
connector to whatever pin the microphone uses for the microphone lead. 
Kenwood and Elecraft use pin 1 for the microphone lead, but some other 
microphones may have it on a different pin on the 8 pin connector.  My guess 
is that internally, KS4L didn't have his K2 wired to match whatever adapter 
he is using.  The K2 has only one input for the microphone, and that is the 
8 pin connector on the front.  So, the internal microphone terminal has to 
be wired accordingly so that the microphone pin selected (and the PTT, GND, 
etc.) will properly correlate to however the microphone connector (8 pin) he 
is using is wired.  Presumably he has some sort of pigtail wired up to 
convert from the 3.5 mm plug on the CM500 to an 8 pin connector which goes 
to the K2.

So, it's not necessarily your instructions that were wrong--it's just how 
was he going from the CM500 to the K2's front panel connector, and further, 
how is that wired internally--at least I think that must have been the 
problem.

Dave W7AQK


- Original Message - 
From: Jim Brown j...@audiosystemsgroup.com
To: Elecraft List elecraft@mailman.qth.net
Sent: Wednesday, January 20, 2010 10:22 AM
Subject: [Elecraft] CM500 Powering from K2


A week or so ago, KS4L asked for info on powering the CM500 from
 his K2. He tried the instructions I gave, but it didn't work. Bear
 in mind here that several variations of output stages are used for
 the FET impedance converter in electret mics, and not all mfrs wire
 them the same way to their plugs. For this reason, a single
 powering method doesn't work for all electret mics. We learned this
 two decades ago in the pro audio world when we started using
 lavalier (clip-on) mics with wireless mic transmitters, and every
 mfr of both mics and wireless systems published lots of info about
 how to hook their stuff up.

 The CM500 works directly with the K3, so I looked at what the K3
 does for power. It's 5.6K to the tip only. The K3 makes no
 connection to the ring. Randy tried that and it works fine.

 So -- revised advice. From the CM500 mic plug, wire the tip to the
 mic input, add a 5.6K resistor between +DC on the K2 mic jack and
 the mic input. The resistor value is not critical, 4.7K to 8.2K
 should work fine. There is very little current, so very small
 resistors are fine. The sleeve (common) of the plug goes to common
 at the mic jack.

 The same wiring should work with this mic for nearly all other ham
 rigs.

 I would expect the CM500 to work really well with the K2. One of
 the few shortcomings of the K2 is that since it was originally
 designed as a QRP CW rig, the support for SSB is not a strong
 point. One way this shows up is in relatively low audio gain and
 not enough LF rolloff. The CM500 helps this situation, first
 because it's a pretty hot mic (that is, higher than average
 output level) and because the low end is rolled off internally.

 There are several published mods to improve the gain of the SSB
 signal chain, some of which go all the way to the RF end of the
 chain. I took the simpler approach, modifying my K2s by changing a
 few resistors and capacitors in the mic stages to provide rolloff
 around 500 Hz and increase the gain by about 7dB. This allows the
 mic to hit the compressor harder (and the rolloff prevents low
 frequency sounds from hitting the compressor), making the audio
 more competitive. The CM500 should provide the same improvements
 but without the mods.

 73,

 Jim Brown K9YC



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