Re: [Elecraft] Boost power supplies for RF amps

[Bill Frantz]

On 2/20/17 at 5:35 PM, jackbrin...@me.com (Jack Brindle) wrote:

To be fair, we have had one instance of the problem, and that 
station was running the battery critically low. In fact the 
battery failed at that voltage (something like 10 volts) and 
had to be permanently removed from service. Perhaps the answer 
is to take the battery manufacturer’s advice and not to run 
the batteries below 11.5 volts. I believe the K3 has a 
low-voltage alarm that can be applied to the problem so that it 
gives a warning at the critical voltage and won’t continue 
until the power is corrected.


Thanks for reminding me of the details. The 100W CQP incidents 
and the 5W FD ones get blurred in my mind.


Yes, the K3 has a low voltage warning. The level is controlled 
by the "BAT MIN" CONFIG menu setting with a default of 11V. It 
sends out a beep tone and flashes BAT LOW on the display. If you 
use a boost regulator like the TG Electronics Boost Regulator, 
note that these may introduce a junction voltage drop which will 
cause the warning to sound at a higher voltage.


73 Bill AE6JV

---
Bill Frantz| I don't have high-speed  | Periwinkle
(408)356-8506  | internet. I have DSL.| 16345 
Englewood Ave
www.pwpconsult.com |  | Los Gatos, 
CA 95032


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Re: [Elecraft] Boost power supplies for RF amps

[Phil Kane]

On 2/20/2017 3:11 PM, Matthew Cook wrote:

> I believe we will see a return of the 50V MOSFET PA's in commercial
> equipment again, especially with the explosion of LDMOS devices and the
> ever decreasing availability of 16-18V bi-polar RF transistors.

Modern commercial communication sites have all gone to 48V "Bell
Telephone Standard - positive ground" with corresponding radio
equipment.  Inverters for 120V AC and 12/24V DC where needed.  It's a
whole new world for us "old timers".

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

>From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon

VP - General Counsel & Engineering Manager
CSI Telecommunications, Inc. - Consulting Engineers
San Francisco, CA - Beaverton, OR
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Re: [Elecraft] (OT) CW Resonant Speaker

[Joe Subich, W4TV]

Knowing very little about the physics of sound, does using a thinner
tube as opposed to a larger diameter one, make the tube have a
narrower " bandwidth " ?


See: http://www.fonema.se/qpipe/qpipe.htm

Since the primary loss component of an "organ pipe" is friction along
the wall, a larger diameter tube will have lower losses and thus higher
"Q".


73,

   ... Joe, W4TV


On 2/20/2017 9:51 PM, Dean L wrote:

This whole topic is very interesting to me. Very ironically, just before
this topic got started, I was thinking about qrp hall of famer, Rick
Littlefield's,  Ham Radio magazine article Mar 89', featuring a resonant cw
speaker.
It was built using a solo 16 cup and a small 700hz transducer.
I put it on my to do list, back in 89'... nearly 28 years later I FINALLY
sent Rick an email asking if he still had any of these little speakers
left, after so many years... A few days later I had a package from Rick
with a couple of the little speakers!
The generosity of old school hams never ceases to amaze me.

I have a question for those in the "know"--

Knowing very little about the physics of sound, does using a thinner tube
as opposed to a larger diameter one, make the tube have a narrower "
bandwidth " ?
How would on increase the Q of the device ( if that's even possible)?

I'd appreciate any input. TIA

72
Dean/K2WW

On Feb 18, 2017 8:09 AM, "jrquark"  wrote:


The confusion here is a common one, closed vs open ended resonators,
especially if one looks at the poorly explained graphs in most physics
texts.

The speaker, attached to one end of the pipe, is not the closed end, it is
open, since it drives the air particles at that end, and that makes it a
displacement antinode, where the particle displacement is maximum.

Jim - K7BIE



On Feb 17, 2017, at 9:43 PM, Joe Subich, W4TV  wrote:

A cylinder with a speaker in one end and open in the other is an "open"
cylinder (open pipe).  It is a *half wave* in air which means the
formula uses 2f instead of f.


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Re: [Elecraft] (OT) CW Resonant Speaker

[Dean L]

This whole topic is very interesting to me. Very ironically, just before
this topic got started, I was thinking about qrp hall of famer, Rick
Littlefield's,  Ham Radio magazine article Mar 89', featuring a resonant cw
speaker.
It was built using a solo 16 cup and a small 700hz transducer.
I put it on my to do list, back in 89'... nearly 28 years later I FINALLY
sent Rick an email asking if he still had any of these little speakers
left, after so many years... A few days later I had a package from Rick
with a couple of the little speakers!
The generosity of old school hams never ceases to amaze me.

I have a question for those in the "know"--

Knowing very little about the physics of sound, does using a thinner tube
as opposed to a larger diameter one, make the tube have a narrower "
bandwidth " ?
How would on increase the Q of the device ( if that's even possible)?

I'd appreciate any input. TIA

72
Dean/K2WW

On Feb 18, 2017 8:09 AM, "jrquark"  wrote:

> The confusion here is a common one, closed vs open ended resonators,
> especially if one looks at the poorly explained graphs in most physics
> texts.
>
> The speaker, attached to one end of the pipe, is not the closed end, it is
> open, since it drives the air particles at that end, and that makes it a
> displacement antinode, where the particle displacement is maximum.
>
> Jim - K7BIE
>
>
> > On Feb 17, 2017, at 9:43 PM, Joe Subich, W4TV  wrote:
> >
> > A cylinder with a speaker in one end and open in the other is an "open"
> > cylinder (open pipe).  It is a *half wave* in air which means the
> > formula uses 2f instead of f.
>
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Re: [Elecraft] Boost power supplies for RF amps

[Phil Kane]

At my home station I run my transmitters on a "boosted" 14+ V bus using
a TG Electronics Boost Regulator - and "the knobs" at about "3 o'clock".
 The station battery can go as low as 11.5 V but the 14V bus stays there.

On 2/20/2017 3:56 PM, Ron D'Eau Claire wrote:
> For the rigs running off of 12 (13.8) Vdc, how about simply not running the
> rig "all knobs full right"? 
> 
> Reducing the power by 25% will improve IMD performance at lower voltages,
> yet that power difference is virtually impossible to detect on the H.F.
> bands. 

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] [KX3] Re: Psk 31

[Ken G Kopp]

My favorite CW frequency.  You'll find little/no digital activity on 7035.
Look around 7070.

On Feb 20, 2017 18:47, "wrjohnso...@hotmail.com [KX3]" <
kx3-nore...@yahoogroups.com> wrote:



Isn't 7.035 smack in the middle of the cw operating band?

Have a great day!
Bill
K9YEQ




On Mon, Feb 20, 2017 at 6:09 PM -0600, "harry latterman
harrylatter...@yahoo.com [KX3]"  wrote:


>
> Brian,
>
> First of all PSK31 is a live and well and I make contacts daily.  90% of
> the time on 20 meters during the day and the only use 40 meters at night.
> That said 7.035 mhz is suppose to be the hot spot for 40 meters. That said
> I find more activity at 7.070 where I also find OLIVIA in the same basic
> area. So be sure to try both freq and see what happens.
>
> JT-65 is the hot one one.  I finally loaded WSJT-X last week and made
> dozens of contacts with little to no effort.  I think that is the main
> draw.  Kind of like contesting where you just exchange the minimal
> information and add to your logbook.  PSK31/63 can be just as bad with
> macro to macro contacts, but it is also a place to actually have a good
> QSO.. Oliva is even better since it digs signal out of the noise like magic
> and getting a 100% copyy qso is very easy.  But it is slw. Faster the
> JT-65, but compared to PSK31/63 it is very Slw.. For rag chewing I
> prefer it.
>
> Hope my 2 cents will help 
>
> 73 Harry  K7ZOV
>
>
> --
> *From:* "Brian Chapnick brianchapn...@rogers.com [KX3]" <
> kx3-nore...@yahoogroups.com>
> *To:* Kx3 ​ 
> *Sent:* Monday, February 20, 2017 3:36 PM
> *Subject:* [KX3] Re: Psk 31
>
>
> Well, I just checked again on psk reporter. The map is full of jt65
> stations listening and only 3 on psk 31 in NA on 40 meters.  That is a
> strange shift to me. Any reason for the lack of psk31 in particular
> activity? Isn't psk31 a good mode of communication at low power or poor
> conditions?
>
> Brian
>
> Sent from my BlackBerry Priv the most secure mobile device - via the
> Rogers Network
>
>
> __._,_.___
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Re: [Elecraft] Boost power supplies for RF amps

[Jack Brindle]

Bill;

To be fair, we have had one instance of the problem, and that station was 
running the battery critically low. In fact the battery failed at that voltage 
(something like 10 volts) and had to be permanently removed from service. 
Perhaps the answer is to take the battery manufacturer’s advice and not to run 
the batteries below 11.5 volts. I believe the K3 has a low-voltage alarm that 
can be applied to the problem so that it gives a warning at the critical 
voltage and won’t continue until the power is corrected.

In general, we have found the K3 to be an excellent performer when running off 
battery at 12 to 13.8 volts, whether charging or not. Anyone wishing to hear 
us, just listed for K6EI in Field Day. And for those who wonder, having great 
antennas 500 or so feet above San Francisco Bay gives us great signals, even at 
5 watts.

- Jack, W6FB


> On Feb 20, 2017, at 4:57 PM, Bill Frantz  wrote:
> 
> I'm trying to reconcile this advice with our experience running QRP field 
> day. We frequently have two or 3 K3s on a single band (CW, SSB, 
> Digital/GOTA). We use batteries and solar cells since our site does not 
> permit generators. When the radios are being fed from a charged battery or a 
> battery being charged from the solar cells, we don't have a significant 
> problem with interference between stations. (Antenna placement helps a lot 
> too.) When the voltage drops, the complaints increase.
> 
> Of course, our 5 watts is quite a bit below the full power of the low power 
> RF amp in the K3.
> 
> 73 Bill AE6JV
> 
> On 2/21/17 at 4:05 PM, k9...@live.com (Bill Johnson) wrote:
> 
>> Reducing the power by 25% will improve IMD performance at lower voltages, 
>> yet that power difference is virtually impossible to detect on the H.F.
>> bands.
> ---
> Bill Frantz| Truth and love must prevail  | Periwinkle
> (408)356-8506  | over lies and hate.  | 16345 Englewood Ave
> www.pwpconsult.com |   - Vaclav Havel | Los Gatos, CA 95032
> 
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Re: [Elecraft] Boost power supplies for RF amps

[Bill Frantz]

I'm trying to reconcile this advice with our experience running 
QRP field day. We frequently have two or 3 K3s on a single band 
(CW, SSB, Digital/GOTA). We use batteries and solar cells since 
our site does not permit generators. When the radios are being 
fed from a charged battery or a battery being charged from the 
solar cells, we don't have a significant problem with 
interference between stations. (Antenna placement helps a lot 
too.) When the voltage drops, the complaints increase.


Of course, our 5 watts is quite a bit below the full power of 
the low power RF amp in the K3.


73 Bill AE6JV

On 2/21/17 at 4:05 PM, k9...@live.com (Bill Johnson) wrote:

Reducing the power by 25% will improve IMD performance at lower 
voltages, yet that power difference is virtually impossible to 
detect on the H.F.

bands.

---
Bill Frantz| Truth and love must prevail  | Periwinkle
(408)356-8506  | over lies and hate.  | 16345 
Englewood Ave
www.pwpconsult.com |   - Vaclav Havel | Los Gatos, 
CA 95032


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Re: [Elecraft] Boost power supplies for RF amps

[Bill Johnson]

And there is little difference in signal strength, might actually be stronger 
as copy is better and less signal wasted by eliminating IMD, etc.

73,
Bill
K9YEQ

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron D'Eau 
Claire
Sent: Monday, February 20, 2017 5:56 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Boost power supplies for RF amps

For the rigs running off of 12 (13.8) Vdc, how about simply not running the rig 
"all knobs full right"? 

Reducing the power by 25% will improve IMD performance at lower voltages, yet 
that power difference is virtually impossible to detect on the H.F.
bands. 

73, Ron AC7AC

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Re: [Elecraft] Boost power supplies for RF amps

[Ron D'Eau Claire]

For the rigs running off of 12 (13.8) Vdc, how about simply not running the
rig "all knobs full right"? 

Reducing the power by 25% will improve IMD performance at lower voltages,
yet that power difference is virtually impossible to detect on the H.F.
bands. 

73, Ron AC7AC

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Re: [Elecraft] Boost power supplies for RF amps

[Matthew Cook]

I have a Codan 6924 lunch box radio that does just this.

 (
http://www.hfradiosales.com.au/codan_%20barrett_hf_radio_information/RADIOS/files/6924%20MK2-2.jpg
)

It takes in 10-15V and boosts it to 28V to feed a 25W PA, it does so only
on TX.  This radio was designed in 1969 and released to market in 1971, I
got mine given to me in 1979.  So this concept is not new.   Way back when
the 28V RF transistors of the day did not operate well with low collector
voltages at 12V, IMD was way too high.  For reference the 6924 IMD is
better than -40dB PEP for a 38 yr old radio.

I believe we will see a return of the 50V MOSFET PA's in commercial
equipment again, especially with the explosion of LDMOS devices and the
ever decreasing availability of 16-18V bi-polar RF transistors.

73

Matthew
VK5ZM

On 21 February 2017 at 09:10, Mel Farrer via Elecraft <
elecraft@mailman.qth.net> wrote:

> I have long wondered why some manufacture did not think of it.  That is a
> amp with built in 12 VDC boost PS.  With all of the new switching tech, it
> should be a KISS solution and make the amp SOUND GREAT all of the time
> Just my opinion hi.
> Mel, K6KBE
>
>   From: Bill Frantz 
>  To: elecraft@mailman.qth.net
>  Sent: Monday, February 20, 2017 2:08 PM
>  Subject: [Elecraft] Boost power supplies for RF amps
>
> The short answer is they can. It is only a matter of engineering
> time, cost, resulting price, number of customers and competing
> projects. In other words, the usual business considerations.
>
> Lets work the idea through for several of the Elecraft RF amplifiers:
>
> The 10-15W K3(s) amp: This amp can have significant IMD at low
> voltages as we have discovered with our QRP, all Elecraft, field
> day operation. The KX3 seems to do better, so reengineering the
> amp may be a better solution. For field day, we try to have
> fresh batteries available.
>
> The 100W K3(s) internal amp: This amp also has low voltage IMD
> as we found during our 100W California QSO party expeditions.
> But, consider the K3(s)'s construction. The front of the radio
> is the digital portion, including the DSPs and the front panel
> computer. All of this digital noise is isolated from the analog
> circuits in the back of the radio. If Elecraft were to include a
> boost power supply with the internal amp, that high-current
> switcher would be in the analog section, and probably impossible
> to quiet. Solution: Get an external boost power supply.
>
> The KXPA100 external amp: This form factor would be an ideal
> place to include a boost power supply. The use profile includes
> portable battery operation and designing isolation for the power
> supply into the package seems straight forward.
>
> The KPA500 external amp: The amp setup procedure sets the
> voltage to to 65v to 85v and the specifications call for about
> 1000 VA of power or about 13A at 75v. That would be nearly 75A
> at 13.5 volts assuming 100% efficiency, so it would be a good
> idea to put the boost power supply next to the battery and run
> 75v to the amp. It would make a nice high power mobil rig.
>
> 73 Bill AE6JV
>
> In thread "Re: [Elecraft] Chinese ebay amps for KX3", on 2/20/17
> at 5:47 AM, pin...@erols.com (Charlie T, K3ICH) wrote:
>
> >So now, tell me why a mid-sized radio can't have a built in 12 V to say,
> 50
> >V converter to drive some HV FETs for cleaner output specs like the Yuge
> >radios.
> ---
> Bill Frantz|The nice thing about standards| Periwinkle
> (408)356-8506  |is there are so many to choose| 16345
> Englewood Ave
> www.pwpconsult.com |from.  - Andrew Tanenbaum| Los Gatos,
> CA 95032
>
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>
>
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Re: [Elecraft] Boost power supplies for RF amps

[David Orman]

I believe the new Anan-8000DLE does exactly this, and steps up the voltage
to 50V. No idea if there's any noise related to these boost converters.
Seems like a neat idea, just not sure how it will work in practice.

On Mon, Feb 20, 2017 at 4:08 PM, Bill Frantz  wrote:

> The short answer is they can. It is only a matter of engineering time,
> cost, resulting price, number of customers and competing projects. In other
> words, the usual business considerations.
>
> Lets work the idea through for several of the Elecraft RF amplifiers:
>
> The 10-15W K3(s) amp: This amp can have significant IMD at low voltages as
> we have discovered with our QRP, all Elecraft, field day operation. The KX3
> seems to do better, so reengineering the amp may be a better solution. For
> field day, we try to have fresh batteries available.
>
> The 100W K3(s) internal amp: This amp also has low voltage IMD as we found
> during our 100W California QSO party expeditions. But, consider the K3(s)'s
> construction. The front of the radio is the digital portion, including the
> DSPs and the front panel computer. All of this digital noise is isolated
> from the analog circuits in the back of the radio. If Elecraft were to
> include a boost power supply with the internal amp, that high-current
> switcher would be in the analog section, and probably impossible to quiet.
> Solution: Get an external boost power supply.
>
> The KXPA100 external amp: This form factor would be an ideal place to
> include a boost power supply. The use profile includes portable battery
> operation and designing isolation for the power supply into the package
> seems straight forward.
>
> The KPA500 external amp: The amp setup procedure sets the voltage to to
> 65v to 85v and the specifications call for about 1000 VA of power or about
> 13A at 75v. That would be nearly 75A at 13.5 volts assuming 100%
> efficiency, so it would be a good idea to put the boost power supply next
> to the battery and run 75v to the amp. It would make a nice high power
> mobil rig.
>
> 73 Bill AE6JV
>
> In thread "Re: [Elecraft] Chinese ebay amps for KX3", on 2/20/17 at 5:47
> AM, pin...@erols.com (Charlie T, K3ICH) wrote:
>
> So now, tell me why a mid-sized radio can't have a built in 12 V to say, 50
>> V converter to drive some HV FETs for cleaner output specs like the Yuge
>> radios.
>>
> ---
> Bill Frantz|The nice thing about standards| Periwinkle
> (408)356-8506  |is there are so many to choose| 16345 Englewood Ave
> www.pwpconsult.com |from.   - Andrew Tanenbaum| Los Gatos, CA 95032
>
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Re: [Elecraft] second receive antenna port of K3

[Don Wilhelm]

Will,

You are interpreting the manual correct.  The ANT1/2 choice can be made 
independently of whether the KAT3A is in BYPASS or TUNE.


73,
Don W3FPR

On 2/20/2017 5:36 PM, WILLIE BABER wrote:


I need access to both ports without the tuner, i.e., the tuner is bypassed on 
either port.  I think this is want the manual is saying but I want to be 
certain.

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Re: [Elecraft] Boost power supplies for RF amps

[Mel Farrer via Elecraft]

I have long wondered why some manufacture did not think of it.  That is a amp 
with built in 12 VDC boost PS.  With all of the new switching tech, it should 
be a KISS solution and make the amp SOUND GREAT all of the time
Just my opinion hi.
Mel, K6KBE

  From: Bill Frantz 
 To: elecraft@mailman.qth.net 
 Sent: Monday, February 20, 2017 2:08 PM
 Subject: [Elecraft] Boost power supplies for RF amps
   
The short answer is they can. It is only a matter of engineering 
time, cost, resulting price, number of customers and competing 
projects. In other words, the usual business considerations.

Lets work the idea through for several of the Elecraft RF amplifiers:

The 10-15W K3(s) amp: This amp can have significant IMD at low 
voltages as we have discovered with our QRP, all Elecraft, field 
day operation. The KX3 seems to do better, so reengineering the 
amp may be a better solution. For field day, we try to have 
fresh batteries available.

The 100W K3(s) internal amp: This amp also has low voltage IMD 
as we found during our 100W California QSO party expeditions. 
But, consider the K3(s)'s construction. The front of the radio 
is the digital portion, including the DSPs and the front panel 
computer. All of this digital noise is isolated from the analog 
circuits in the back of the radio. If Elecraft were to include a 
boost power supply with the internal amp, that high-current 
switcher would be in the analog section, and probably impossible 
to quiet. Solution: Get an external boost power supply.

The KXPA100 external amp: This form factor would be an ideal 
place to include a boost power supply. The use profile includes 
portable battery operation and designing isolation for the power 
supply into the package seems straight forward.

The KPA500 external amp: The amp setup procedure sets the 
voltage to to 65v to 85v and the specifications call for about 
1000 VA of power or about 13A at 75v. That would be nearly 75A 
at 13.5 volts assuming 100% efficiency, so it would be a good 
idea to put the boost power supply next to the battery and run 
75v to the amp. It would make a nice high power mobil rig.

73 Bill AE6JV

In thread "Re: [Elecraft] Chinese ebay amps for KX3", on 2/20/17 
at 5:47 AM, pin...@erols.com (Charlie T, K3ICH) wrote:

>So now, tell me why a mid-sized radio can't have a built in 12 V to say, 50
>V converter to drive some HV FETs for cleaner output specs like the Yuge
>radios.
---
Bill Frantz        |The nice thing about standards| Periwinkle
(408)356-8506      |is there are so many to choose| 16345 
Englewood Ave
www.pwpconsult.com |from.  - Andrew Tanenbaum    | Los Gatos, 
CA 95032

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[Elecraft] second receive antenna port of K3

[WILLIE BABER]

Now that I am totally doing so2r K3, I have reasons to use the second antenna 
port available for k3/K3s.  I understand from the K3s manual that the second 
port works off the internal tuner module.  If I understand correctly, you can 
bypass the tuner and then select either of the two antenna ports, OR select the 
tuner for either antenna port.  Is this correct?

I have an old MP that I press into service just to have a radio with a second 
port for contest-specific but misc. antennas.  An MP, modified like mine, is 
good but of course it is not a K3.   Actually, dynamic range is acceptable, at 
least in rural Idaho, but TX phase noise is noticeable in so2r.

Due to my habit of using so2r K3 I may purchase the tuner just to get access to 
that second port--so long as I am not forced to use the tuner on either port.  
Wouldn't it be nice to have a module that allows access to the second port 
without purchasing the internal tuner?  

I need access to both ports without the tuner, i.e., the tuner is bypassed on 
either port.  I think this is want the manual is saying but I want to be 
certain.

73, Will, wj9b

CWops #1085
CWA Advisor levels II and III
http://cwops.org/
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[Elecraft] Boost power supplies for RF amps

[Bill Frantz]

The short answer is they can. It is only a matter of engineering 
time, cost, resulting price, number of customers and competing 
projects. In other words, the usual business considerations.


Lets work the idea through for several of the Elecraft RF amplifiers:

The 10-15W K3(s) amp: This amp can have significant IMD at low 
voltages as we have discovered with our QRP, all Elecraft, field 
day operation. The KX3 seems to do better, so reengineering the 
amp may be a better solution. For field day, we try to have 
fresh batteries available.


The 100W K3(s) internal amp: This amp also has low voltage IMD 
as we found during our 100W California QSO party expeditions. 
But, consider the K3(s)'s construction. The front of the radio 
is the digital portion, including the DSPs and the front panel 
computer. All of this digital noise is isolated from the analog 
circuits in the back of the radio. If Elecraft were to include a 
boost power supply with the internal amp, that high-current 
switcher would be in the analog section, and probably impossible 
to quiet. Solution: Get an external boost power supply.


The KXPA100 external amp: This form factor would be an ideal 
place to include a boost power supply. The use profile includes 
portable battery operation and designing isolation for the power 
supply into the package seems straight forward.


The KPA500 external amp: The amp setup procedure sets the 
voltage to to 65v to 85v and the specifications call for about 
1000 VA of power or about 13A at 75v. That would be nearly 75A 
at 13.5 volts assuming 100% efficiency, so it would be a good 
idea to put the boost power supply next to the battery and run 
75v to the amp. It would make a nice high power mobil rig.


73 Bill AE6JV

In thread "Re: [Elecraft] Chinese ebay amps for KX3", on 2/20/17 
at 5:47 AM, pin...@erols.com (Charlie T, K3ICH) wrote:



So now, tell me why a mid-sized radio can't have a built in 12 V to say, 50
V converter to drive some HV FETs for cleaner output specs like the Yuge
radios.

---
Bill Frantz|The nice thing about standards| Periwinkle
(408)356-8506  |is there are so many to choose| 16345 
Englewood Ave
www.pwpconsult.com |from.   - Andrew Tanenbaum| Los Gatos, 
CA 95032


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Re: [Elecraft] KX2 Happiness

[kev...@coho.net]

I have found the Microsoft auto-correct system to be far less literate 
than the majority of folks writing text.  It is quite frustrating to 
have to add a half dozen words to its lexicon while I am writing a 
simple email.  Said lexicon includes a few errors which need to be 
corrected.  My high school English teachers would freak.


   Kevin.  KD5ONS


On 2/20/2017 4:47 AM, Thorpe, Jeffrey wrote:

I refer to it as "auto-corrupt."

Jeff - KG7HDZ


On Feb 19, 2017, at 9:29 PM, Wayne Burdick  wrote:

Damn auto-correct :)

Wayne


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[Elecraft] K3 sidetone puzzling malfunction

[Carl Clawson]

After years of using the same* station configuration, for the last couple
weeks I have a weird thing that I haven't been able to explain or isolate a
cause for.

Using one of my headsets, the sidetone decreases in volume by at least
about 10 dB during a transmission. Usually it happens quickly but sometimes
gradually. After a short rest it usually resumes its normal volume. It
happens regardless of monitor volume setting. The tone produced when you
adjust the volume is not affected. RX audio is not affected.

It's not 100% due to RFI because it happens even if I have transmit
disabled. It happens regardless of whether I use the rear panel or front
panel jack and regardless of CW/SSB/digital. It does seem to be more likely
to happen when I'm transmitting, though, which is why I say "not 100%" RFI.
Let's just say that the behavior seems to be aggravated by RF or the
fluctuating DC voltage that comes with it. I've checked my bonding and
connectors for tightness and everything seems OK.

The offending headset is a Koss SB/49 that I've used for more than three
years. It doesn't happen with any of my other headsets. One distinguishing
factor is that this set has a high impedance, 280 ohms DC. The other sets
are in the range of 40-120 ohms.

73, Carl WS7L

* Well not QUITE the same. Last summer I did several of the K3S upgrades
including the KIO3B.
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Re: [Elecraft] [kx2] temperature compensation procedure for kx2 ?

[Lyle Johnson]

No and no.

73,

Lyle KK7P


On 2/20/17 10:19 AM, kevino z wrote:

Is there the ability or even need to perform the temp compensation / 
calibration procedure in the kx2...

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[Elecraft] MixW and K3...

[Dave Cole]

Hi,
Is anyone using a K3 with MixW?  If so, I have a few questions for 
you...  Please contact off list.

--
73s and thanks,
Dave
NK7Z
http://www.nk7z.net
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[Elecraft] K2 internal battery

[inventor61 .]

I was asked several times on private messages for this information.
Note:  I am not affiliated with the supplier in any way.

The discussion was for a custom replacement for the 2.9 Ampere-hour gel
cell used in the Elecraft KBT2.

The replacement suggested by me is a rechargeable 4.5 Ampere-hour LiFePO4
pack.
It fits where the gel cell does, in the Elecraft custom internal bracket.
It is almost exactly half the weight.

Batteryspace item CU-J1087

http://www.batteryspace.com/custom-lifepo4-18650-battery-12-8v-4500-mah-57-6wh-7a-rate-w-pcb-and-connector.aspx

see detailed text in 'prewired' part of product description

matching charger:

http://www.batteryspace.com/smart-charger-1.5a-for-12.8-v-lifepo4-battery-pack.aspx

use the version with the 5.5x2.1mm plug




Steve KZ1X/4
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[Elecraft] K3 Shipping Box

[Terry Schieler]

 Back in 2013, I purchased a custom shipping box from Dave Haller, KA1W, of 
www.hamradioboxes.com with which to ship an Acom 1000 amplifier that I was 
selling.  It was pricy, but so was the amp.  I would not have purchased one for 
just a half a K3 round trip to Elecraft Service, but if you are doing 
DXpeditions and moving your gear around regularly, his custom boxes were 
outstanding.  

Update:  I did a quick Google search for Ham Radio Boxes and the most recent I 
can find is from 2014 saying that Dave had taken a "temporary break" from the 
box building business.  Sad, as Dave was excellent to work with.

See my (and other) eHam review:  http://www.eham.net/reviews/detail/9938?page=2

73 Terry WØFM



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[Elecraft] K3/100 gets hotter running remote (terminal mode) vs. 100W out

[j...@kk9a.com]

Can't you set the fan to be on continuously?

John KK9A

Barry w2up said:
Mon Feb 20 08:00:19 EST 2017

I operated my K3/100 remotely this weekend in ARRL DX.  I noticed the top of
the case getting pretty warm - not too hot to touch, but warm enough I
wouldn't want to keep my hand on it.  The fan never came on.

Is this normal?  If so, perhaps firmware should be updated to sporadically
run the fan and suck some air through.

Barry W2UP

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[Elecraft] FS: K8RA P2jr QRP Paddle

[Tim Cook]

I'm selling my last iambic paddle, it's a somewhat rare K8RA P2jr that I
used qrp/camping (serial number 12) miniature iambic paddle. it is made to
the same high quality standards all of Jerry's were, solid brass and ball
bearing pivots. The base is 2"x2 1/2" and weighs just over 1 lb. Requires a
small allen wrench for adjustments, NOT included. It is in very nice
condition and comes with an attached cable terminated in a 1/8" plug. I have
pics if needed. The only trade I would consider is for a Vibroplex
Vibrokeyer in the same condition. I'll ship and insure this paddle in the US
via Priority Mail for $99 PayPal or postal money order. Thanks Tim NZ8J

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Re: [Elecraft] Quick Way To Accurately Measure K3s CW Filter Offset?

[Eric Swartz - WA6HHQ, Elecraft]

Also make sure your sidetone pitch setting is where you like it.
Eric
/elecraft.com/

On 2/18/2017 9:00 AM, Nr4c wrote:

The 409 is zero.

Are the passband centered on display?

Sent from my iPhone
...nr4c. bill



On Feb 18, 2017, at 3:30 AM, Dave AD6A  wrote:

Hi Folks,



I'm having a go at my first CW contest for many years (and boy, am I
rusty!!).

I've worked several new countries already, BUT, I noticed my K3s main and
sub receivers' 400Hz and 200Hz CW filter offsets are all quite a bit off
(even though I put the offsets in that were written on the filters), causing
me to tune the stations in at a lower than optimal tone (in order to hear
them properly) and trying to put in an XIT offset so they can hear me in
their tight RX passband. So far, it's not working that well. At a rough
guess, I'd say they were about 200 to 300Hz low of where I need them to be
(600Hz tone is my chosen optimal listening frequency).



So, my question is, is there a simple way to accurately determine what the
frequency offset of each filter is without having to open the rig up and
dive in with test equipment?



I'm guessing it could be something like:

a.Tune in a strong-ish CW station or carrier to exactly 600Hz audio
(use the tone mon to compare with the 600Hz reference audibly)
b.Note the VFO frequency (on FINE)
c.Use the RIT function to tune the station/carrier in to the peak of
the crystal filter
d.Note the offset
e.Apply the offset to the crystal filter bank



What do you think of this procedure?

Got a better/quicker one?

Any/all input most gratefully accepted.



Cheers es 73,

Dave AD6A



---
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[Elecraft] [kx2] temperature compensation procedure for kx2 ?

[kevino z]

Is there the ability or even need to perform the temp compensation / 
calibration procedure in the kx2 like I did on my KX3?

Thanks
-Kevin (KK4YEL)

-
The problem with the world is that the intelligent people are full of doubts, 
while the stupid ones are full of confidence.
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Re: [Elecraft] Chinese ebay amps for KX3

[Richard Fjeld]

The way the wire is wound through the tubes in the photo reminds me of 
the 100W PA section in the Heathkit HW/SB-104 transceiver.

Dick, n0ce


On 2/20/2017 5:03 AM, Hajo Dezelski wrote:
> Hello,
>
> I use this one:
> http://pa-11019.blogspot.de/2016/11/diy-kits-70w-ssb-linear-hf-power.html
> and it works without any problem.
>
> 73 de
>
> Hajo dl1sdz
>
>
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[Elecraft] Follow-up... Considering KPA500/KAT500 Combo with Flex 6500

[Kevin - K4VD]

I put the new KPA/KAT500 to work with my Flex 6500 this weekend in the
ARRL-DX-CW contest and I had an absolute blast! It was generally a casual
effort but netted 500 contacts, about 90ish being unique DX and qualified
for CW DXCC. I worked 80,40,20,15 (surprisingly productive on 15) and ran
the KPA between 250 and 500 watts. Mostly glitch-free operation.

I did happen to kill my wife's satellite reception. Tech coming this week
to check it out.
​[Tech arrived, wind damage to the dish, not me!] ​
Also, her TV would bring up different menus. This only happened on 40
meters above 190 watts. I will need to drop some ferrites on the various
leads up there and see how that works for her. The neighbors, about 160'
away, didn't complain but I'm bigger than they are so maybe they were too
scared. ;)

I used N1MM+ along with CW Skimmer. I set up the skimmer as a local cluster
and telnet'd to it from N1MM+. The bandmap was useful but the list of
available Qs and Mults was the key. I just worked my way top to bottom
(sorted by newest) and it was like shooting fish in a barrel. I think. I
never really shot a fish in a barrel. But it was very easy to work the
list, see a mult come in and jump on it immediately. At some points I
almost felt like I was in Run mode with how quickly I was nabbing contacts.
Again, it was a real pleasure working this way when everything just snaps
into place.

I have a hex beam for 20 meters. It is only about 10' off the ground on a
roof mount. I really felt the value of the hex finally. When selected over
the dipole the noise level dropped along with most of the signals. While
the S-meter read lower for the signal of interest there was also much less
noise and interference from other signals. I only saved one audio sample
showing dipole/hex a/b while working a Japan station. Not sure if
attachments make it on the reflector but if it does, the first few seconds
is dipole. Then I flip to the hex and  you can dig Japan out of the noise.
Being able to not only copy him but work him successfully was pretty
exciting for me. My QSOs with that part of the world are very rare.

Thanks Elecraft for all the fun. Thanks for making the KPA/KAT combo deal
and making such great equipment. Big thanks for making them valuable even
if not run with an Elecraft rig. I don't think I missed out on a single
feature of the amp/tuner combo running with the Flex.

​Unfortunately the audio was moderated out. ​It's posted here
 in case you're interested.


73,
Kev K4VD
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[Elecraft] K2 internal battery

[inventor61 .]

Harry

I use the Batteryspace charger recommended for that pack and simply plug it
into the radio.
I had to select the model with the right plug to match the rig.
I flip the battery switch  on the K2 'on' for charging.  The charger shuts
itself off when done.
No radio alterations or anything else are needed.  I did not want to drill
holes or add switches.
I do *not* operate the radio while it is charging, although doing so won't
cause any damage.
The charger is a switching supply and is RF noisy.
The LiFePO4 pack provides 2x to 3x the portable run time that the gel cell
did.
The new pack also appears to have a lower self discharge rate.  I can go
months after a full charge.
For use while at a fixed location I have a RF quiet power supply from Pro
Audio Engineering
.
This power supply does not charge the battery, so, you just flip the
battery switch off.
Oh, I should mention, the new LiFePO4 pack is designed specifically to fit
inside the Elecraft bracket that comes as part of the internal battery kit.
Since I already had that internal battery it was easy to change it out.
If you are doing this from scratch maybe Elecraft will sell you just the
bracket and switch (the kit less the gel cell and wiring which are part of
the internal kit).
If you accidentally leave on the 'regular' power while the battery switch
is on, the battery will not charge fully.

Steve KZ1X
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[Elecraft] Elecraft K1-4 for sale

[David Perrin]

Hi-
 I have an excellent K1-4 for sale. It covers 40, 30, 20, 15 Meters. Has the 
built in automatic antenna tuner and noise blanker. Also comes with the 
original K1-2 band board that covers 40 and 20 with power cord. No scratches, 
non smoker, used only in shack.

$415 shipped CONUS.  In NH



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Re: [Elecraft] Need source for 8-pin mic panel jack as on K3

[Joel Hallas]

Many thanks to all who replied! It seems as if there are many sources. Based
on the recommendation of Joe Subich, W4TV, I just ordered from Buxcom
(www.packetradio.com), which had both cable and panel types, as well as some
other things I was looking for.

Regards, Joel Hallas, W1ZR
Westport, CT


-Original Message-
From: Joel Hallas [mailto:jrhal...@optonline.net] 
Sent: Monday, February 20, 2017 10:29
To: 'elecraft@mailman.qth.net'
Subject: OT: Need source for 8-pin mic panel jack as on K3

Dear List,

I need to find a source for the type of 8-pin (male) panel jack, as used on
the K3 and many other ham transceivers. This is for a project to allow
connection of my Elecraft wired mic. Radio Shack used to sell these, but now
seems to just have the cable side. If anyone has a mfr name and part number
that I can search for, I'd appreciate it.

Thanks!

Regards, Joel Hallas, W1ZR
Westport, CT



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Re: [Elecraft] Chinese ebay amps for KX3

[len]

Does it work well with all modes?  CW/SSB/Digital?

73

Len


-Original Message-
Subject: Re: [Elecraft] Chinese ebay amps for KX3

Hello,

I use this one:
http://pa-11019.blogspot.de/2016/11/diy-kits-70w-ssb-linear-hf-power.html
and it works without any problem.

73 de

Hajo dl1sdz

---
Cela est bien dit, mais il faut cultiver notre jardin.


http://hajos-kontrapunkte.blogspot.de/



Am 20.02.2017 3:46 vorm. schrieb "Richard Lawn" :

> Has anyone tried the little inexpensive 45 watt amplifiers out of 
> China being sold on ebay with their KX3. I built a BPF for an old 
> Palomar amp but it doesn't seem to work well at all for some reason.
> 73
> Rick W2JAZ
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>
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Re: [Elecraft] OT: Need source for 8-pin mic panel jack as on K3

[Lyle Johnson]

Hello Joel!

Try

http://www.americanradiosupply.com/8-pin-ham-cb-radio-microphone-connector-panel-jack/

I haven't tried this particular source, but I suspect it will work for you.

73,

Lyle KK7P


On 2/20/17 8:29 AM, Joel Hallas wrote:

Dear List,

I need to find a source for the type of 8-pin (male) panel jack, as used on
the K3 and many other ham transceivers.


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[Elecraft] Audio File Transfer to K3S

[Byron Peebles]

I recall reading something about transferring optimized audio files to 
the K3S, but I can't locate it.


I would like to prepare contest exchanges in a desktop software package 
and move them to the Elecraft digital voice keyer in the K3S.  I would 
like to tranfer these files using the standard K3 Utility or some 
Python-languafe PySerial code.


Can anyone point me to this capability?  I'd liek to complete the work 
by ARRL DX SSB in three weeks.


73, Byron
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[Elecraft] 8 pin mic

[Robert 'RC' Conley]

-- 
May You Live Long and Prosper
what's life without a few dragons
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Re: [Elecraft] K2 internal battery

[Harry Yingst via Elecraft]

I read the thread and I did not find how you are charging the battery.
How do you charge it?

Thank you



  From: inventor61 . 
 To: hlyin...@yahoo.com; elecraft@mailman.qth.net 
 Sent: Saturday, February 18, 2017 7:54 PM
 Subject: K2 internal battery
   
Harry

Having done the change myself and helping the vendor make the customization for 
the K2, I would have to recommend the Batteryspace item CU-J1087-V1.

The "V1" connectorization allows for a drop-in incorporating the back panel 
cutoff switch

There's a thread about all this from late August - early September 2015 that 
contains verbose detail regarding this topic.

With the hindsight of a year and a half plus experience, I'm even more happy 
with this setup now than I was then.  I do use their 'matching' charging brick.

Steve KZ1X


   
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Re: [Elecraft] OT: Need source for 8-pin mic panel jack as on K3

[Don Wilhelm]

Joel,

Try p/n #2399 at Universal Radio.

73,
Don W3FPR

On 2/20/2017 10:29 AM, Joel Hallas wrote:

Dear List,

I need to find a source for the type of 8-pin (male) panel jack, as used on
the K3 and many other ham transceivers. This is for a project to allow
connection of my Elecraft wired mic. Radio Shack used to sell these, but now
seems to just have the cable side. If anyone has a mfr name and part number
that I can search for, I'd appreciate it.

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Re: [Elecraft] Chinese ebay amps for KX3

[Don Lewis (KI4D)]

I have gotten the MX-P50M up and running with my KX3 keying it OK.  I was
able to get over 50 watts out of the amp into a dummy load with 6 watts from
my KX-3 on 160 meters.  It turns out to be quite simple to configure once I
researched how the amp lead was used for keying with the FT-817 and what the
KX-3 provided for keying.  The KX3 provides keying via the ACC2 connector on
the ring terminal on the 2.5mm stereo plug on an adapter cable.  The KX3
grounds the key line while transmitting to enable the amplifier to be keyed.
All that was needed was a splice into the red/black lead section intended
for the FT-817 DIN connector with a red/black lead terminated with a 2.5mm
stereo plug. The red lead goes to the ring on the 2.5mm stereo plug.  And
that is it.  This took more time to figure out than I wanted.  Obviously, it
would have taken less time if there was a manual with the amp.

Don, KI4D
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Richard Lawn
Sent: Sunday, February 19, 2017 9:46 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Chinese ebay amps for KX3

Has anyone tried the little inexpensive 45 watt amplifiers out of China
being sold on ebay with their KX3. I built a BPF for an old Palomar amp but
it doesn't seem to work well at all for some reason.
73
Rick W2JAZ
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[Elecraft] OT: Need source for 8-pin mic panel jack as on K3

[Joel Hallas]

Dear List,

I need to find a source for the type of 8-pin (male) panel jack, as used on
the K3 and many other ham transceivers. This is for a project to allow
connection of my Elecraft wired mic. Radio Shack used to sell these, but now
seems to just have the cable side. If anyone has a mfr name and part number
that I can search for, I'd appreciate it.

Thanks!

Regards, Joel Hallas, W1ZR
Westport, CT



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Re: [Elecraft] Chinese ebay amps for KX3

[Jerry Moore]

It's not a matter of can't. Why as a customer should I pay for the added
power supply when I'm installing my rig mobile? Or how about if already have
a nice power supply. 
Do you want to increase the cost of the radio which will result in a higher
weight and cost for customers that don't want the feature ?
With economies of scale I don't see how they could make profit or even break
even doing anything with a power supply when  you look at the market. 

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Charlie T, K3ICH
Sent: Monday, February 20, 2017 8:48 AM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] Chinese ebay amps for KX3

Very nice amp Hajo

So now, tell me why a mid-sized radio can't have a built in 12 V to say, 50
V converter to drive some HV FETs for cleaner output specs like the Yuge
radios.

73, Charlie k3ICH



-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Hajo
Dezelski
Sent: Monday, February 20, 2017 6:04 AM
To: Richard Lawn 
Cc: Elecraft Reflector 
Subject: Re: [Elecraft] Chinese ebay amps for KX3

Hello,

I use this one:
http://pa-11019.blogspot.de/2016/11/diy-kits-70w-ssb-linear-hf-power.html
and it works without any problem.

73 de

Hajo dl1sdz


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Re: [Elecraft] Chinese ebay amps for KX3

[Charlie T, K3ICH]

Very nice amp Hajo

So now, tell me why a mid-sized radio can't have a built in 12 V to say, 50
V converter to drive some HV FETs for cleaner output specs like the Yuge
radios.

73, Charlie k3ICH



-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Hajo
Dezelski
Sent: Monday, February 20, 2017 6:04 AM
To: Richard Lawn 
Cc: Elecraft Reflector 
Subject: Re: [Elecraft] Chinese ebay amps for KX3

Hello,

I use this one:
http://pa-11019.blogspot.de/2016/11/diy-kits-70w-ssb-linear-hf-power.html
and it works without any problem.

73 de

Hajo dl1sdz


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Re: [Elecraft] speaker and phones levels

[Jorge Diez - CX6VM]

Thanks all for the answers

I external speaker will be the solution

I use LINE OUT for other purpose so I need to use spkr jack

thanks for the QSOs in ARRLDX CW

73,
Jorge
CX6VM/CW5W

2017-02-19 20:32 GMT-03:00 Don Wilhelm :

> Jorge,
>
> One method I can think of is to use an external speaker with a variable
> resistor in series.
> The other way is to use amplified (computer) speakers which can usually be
> turned down in volume.
> The 3rd alternative is to use more sensitive headphones.
>
> 73,
> Don
> W3FPR
>
>
> On 2/19/2017 5:36 PM, Jorge Diez - CX6VM wrote:
>
>
>> We use to have SPKR+PH ON so the people at the shack can hear how is going
>> the contest.
>>
>> But when the Operator adjust AF comfortable for the phones, the speaker is
>> very high affecting also the operator that is using phones but can hear
>> the
>> excessive high level of the speaker
>>
>


-- 
73,
Jorge
CX6VM/CW5W
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[Elecraft] K3/100 gets hotter running remote (terminal mode) vs. 100W out

[Barry]

I operated my K3/100 remotely this weekend in ARRL DX.  I noticed the top of
the case getting pretty warm - not too hot to touch, but warm enough I
wouldn't want to keep my hand on it.  The fan never came on.

Is this normal?  If so, perhaps firmware should be updated to sporadically
run the fan and suck some air through.

Barry W2UP



--
View this message in context: 
http://elecraft.365791.n2.nabble.com/K3-100-gets-hotter-running-remote-terminal-mode-vs-100W-out-tp7627175.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] KX2 Happiness

[Thorpe, Jeffrey]

I refer to it as "auto-corrupt."

Jeff - KG7HDZ

> On Feb 19, 2017, at 9:29 PM, Wayne Burdick  wrote:
> 
> Damn auto-correct :)
> 
> Wayne
> 
> 
> On Feb 19, 2017, at 6:01 PM, Mike Morrow  wrote:
> 
>>> But I don't think the Maldol HF whips are available anyway,
>>> so it's a mute point.
>> 
>> And moot as well. :-)
>> 
>> Mike / KK5F
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Re: [Elecraft] Chinese ebay amps for KX3

[Hajo Dezelski]

Hello,

I use this one:
http://pa-11019.blogspot.de/2016/11/diy-kits-70w-ssb-linear-hf-power.html
and it works without any problem.

73 de

Hajo dl1sdz

---
Cela est bien dit, mais il faut cultiver notre jardin.


http://hajos-kontrapunkte.blogspot.de/



Am 20.02.2017 3:46 vorm. schrieb "Richard Lawn" :

> Has anyone tried the little inexpensive 45 watt amplifiers out of China
> being sold on ebay with their KX3. I built a BPF for an old Palomar amp but
> it doesn't seem to work well at all for some reason.
> 73
> Rick W2JAZ
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> Message delivered to dl1...@gmail.com
>
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