Re: [Elecraft] ERR 12V on K3

[Bill VanAlstyne W5WVO]

Derek,

This exact failure mode happened to my K3 #888. An interesting commonality 
is the fact that I also run digital modes (WSJT modes on 6 meters, in my 
case) quite a bit. On mine, the failure mode was intermittent, though about 
95% on the "fail" side. (I.e., it would only occasionally work correctly, 
always when it was stone cold, and then would fail again quickly.) The 
problem was traced with the help of Elecraft tech support to a faulty KPAIO3 
board. They sent me one, I swapped it out, and the problem has never 
recurred.

It's possible that running a 100% duty cycle digital mode caused a marginal 
component on the KPAIO3 board to fail, but in any case, I would contact tech 
support and get a KPAIO3 board sent out to you. Bet it fixes the problem. Be 
prepared for a BEAR of an operation replacing this rather 
difficult-to-get-to board. Fun!

Bill W5WVO


--
From: "Derek Cohn/WB0TUA" 
Sent: Monday, April 26, 2010 8:23 PM
To: 
Subject: [Elecraft] ERR 12V on K3

> Hi Everyone,
>
> I'm still learning how to use my K3 and thanks to the help of everyone on 
> this list, I've been able to sprinkle in a few RTTY contacts with my CW.
>
> A couple of days ago, I was on RTTY and ran into a problem.  I'm pretty 
> sure (but not 100% certain) I had cranked the power down so it showed 
> about 50W out on the K3 meter and was yapping away.  I had essentially 
> finished the QSO and tried to send a couple of farewell characters and the 
> transmitter didn't turn on.  I looked at the display and saw ERR 12V 
> displayed.  I got out the manual and read the error could be do to the PA 
> module dropping into bypass mode.  I power cycled the radio, and tried it 
> in CW...I had about 5 watts out.  I think adjusted the power control until 
> I had full power again.  So, I have two questions:
>
> 1) Did I overheat the K3 running it in RTTY to cause the ERR 12V to be 
> displayed?
>
> 2) If I overheated the radio, should that have happened with the output at 
> 50w on the K3 internal meter?
>
> Thanks for any help you guys can give me!
>
> 73,
>
> Derek Cohn
> Morse Telegraph Club - Alton Chapter
> Office UD, Sine DJ
> Amateur Radio Station - WBØTUA
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> 

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Re: [Elecraft] K3 Notch

[ab2tc]

Why is this not a problem if the regular brick wall filter removes a carrier
outside of its passband but inside the roofing filter's passband? I
understand that if the carrier is strong enough, the HAGC will eventually
kick in, but the DSP main filter is certainly capable of removing
significant interference without ill effects and it's inside the AGC loop.

AB2TC - Knut


W0EWM wrote:
> 
> The problem with having the manual notch filter outside the AGC 
> loop is that if you are trying to notch out a CW signal, although the tone
> is 
> eliminated, the notched signal causes the AGC to pump - thus hurting weak
> signal 
> copy. I think whenever you start using the"big tools" you have an idea
> that you 
> are not in the  "optimum receive situation." For me, the ideal would be
> "auto 
> notch" outside the  loop and "manual notch" inside the loop.
> 73, Merle - W0EWM
> 
> 

-- 
View this message in context: 
http://elecraft.365791.n2.nabble.com/K3-Notch-tp4966407p4968265.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] K3 Notch

[Wes Stewart]

The notch is just another DSP filter.  We (the K3) use(s) DSP filters all of 
the time that are narrower than the front end filter and that remove signals or 
part of signals that should not generate DSP AGC.

In the event the interfering signal is strong enough to overload the second 
mixer, then the hardware AGC kicks in.  No different from any other situation.

Wes  N7WS

--- On Mon, 4/26/10, Joe Subich, W4TV  wrote:

> On 4/26/2010 7:30 PM, N1JM wrote:
> >
> > It's a shame. Such a sophisticated high end radio and
> no notch within the agc
> > loop.
> 
> Part of the problem is that a DSP radio needs to have the
> notch after
> the AGC since part of the function of AGC is preventing the
> ADC from
> being over driven.  If the notch is placed BEFORE the
> AGC detector
> the notch will cause the interfering signal to INCREASE at
> the input
> of the ADC.
> 
> Yes, it would be nice for the notch to allow the receiver
> to return
> to normal gain when the interfering signal is removed but
> that would
> merely cause the HAGC to come into play.
> 
> 73,



  
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[Elecraft] DC-supply for a preamp?

[DM4iM]

Elecrafters,
this might be a rig-killer and vy stupid, but

Can i power a 6m masthead-preamp by feeding dc via choke and coupling
C's to the KXV3A's in/out sockets (where the elecraft preamp is supposed
to sit), or is this a big NONO?

Martin

-- 

73, DM4iM
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Re: [Elecraft] W2IHY 8 band equalizer and EQ Plus

[Lu Romero]

Here Here!  (or Hear Hear):

Jim, are you a disciple of Frank Foti?  :)

I like Julius' gear, and I have worked with the EQPlus
device at the NQ4I Multi Multi station on Rick's Orions. 
This box does make those radios sound quite good, especially
with just a hint of "Delay" dialed in.

I do find that the noise gate on the K3 has a "crackling"
sound when muting and unmuting, making somewhat useless to
me (if you pay attention to that nuance... I do.  Otherwise,
it works just fine) Lyle has done a great job with the TX
chain on the K3... I would like to see some handles on
Attack and Release as well as ratio, but then that could be
painful to use if you dont know what youre doing.  RF
Clipper's attack and decay characteristics are rather
generalised.  

The best way to fix audio ambient noise issues is through
your environment's acoustics instead of "fixing it in the
mix" with processing and gating.

Folks shouldnt forget that we are transmitting into a very
noisy medium.  High dynamic range defeats intelligibility. 
SENSIBLE "compression" (RF Clipping) settings are your
friends, as you then reduce the dynamic range (the
difference between the loudest and the softest sounds in a
given audio waveform) and have more "modulation density" to
rise above the ambient noise on the band.  

Tailoring your frequency response to concentrate power in a
given voice range will go a long way to making your signal
"pop" out of the noise.  Close talk the mic as much as
possible and reduce the mic gain as Jim describes.

A good example on how all these parameters work together to
make your signal stand out can be gleaned by downloading
VE3NEA's excellent "Voice Shaper" simulator program (its
free).  Use your favorite air mic and play with it for a
while to get an understanding of how gates,
compressor/limiters and EQ affect your signal in QRM and QRN
conditions. 

Try to pay attention to the natural acoustics in your
operating position, if you can.  Curtains help, hard walls
hurt.  Carpet helps, Terrazo floors hurt.  Try to set your
operating position and/or microphone somewhat at an angle
between hard reflecting walls to reduce phase cancelling or
adding from the reflecting walls/surfaces.
  
Personally, I am not a believer in ESSB.  But different
strokes for different folks, and I wont criticise folks who
practice this "voodoo" until they become 8kHz wide and QRM
me or I am able to understand them when listening to their
SSB signal in AM mode (all that bass often creates a "pseudo
carrier").

You would be surprised how well you can be heard using the
built in features provided by Elecraft in the K3.  It takes
practice and a commitment to resist the temptation to "turn
it up to eleven".

-lu-W4LT-  


Date: Mon, 26 Apr 2010 10:57:04 -0700
From: "Jim Brown" 
Subject: Re: [Elecraft] W2IHY 8 band equalizer and EQ Plus
To: "Elecraft List" 
Message-ID: <20100426175705.d90c957...@gw1.nlenet.net>
Content-Type: text/plain; charset="us-ascii"

On Mon, 26 Apr 2010 16:18:01 +, Lance Collister wrote:

> It very effectively cuts out the background blower noise

Some of the major causes of audible background noise are 1)
working too 
far from the mic; 2) running the mic gain too high; 3) using
too much 
compression/processing; and 4) not rolling off the low
frequencies. 

In a noisy environment, it always helps to work close to the
mic. It is 
ALWAYS good practice to use the minimum mic gain needed to
get good 
modulation, use no more than about 10dB of
compression/processing, and 
roll off the low frequency content. It's good engineering
practice for the 
highest quality broadcast stations, and it's good practice
for ham radio. 

Indeed, the only difference between what's right for
broadcasting and for 
ham radio is WHERE to cut the low end and HOW MUCH money to
spend on 
compression/processing. Many years ago, I sold processing
systems for 
broadcast stations that cost upwards of $10K in today's
dollars, and I 
helped the chief engineers of those stations adjust them. I
suspect that 
W8JI and K4TAX have similar experience. Before I spent ANY
money on an 
outboard box for a ham rig, I would first follow all of
those elements of 
good engineering practice.  

73,

Jim Brown K9YC



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Re: [Elecraft] K3 Notch

[Val]

I second that. There are a lot of turning to bring the notch from 2000 Hz to
near my pitch of 390 Hz. I would suggest the manual notch to be parked just
outside of the used AF band.  I.e. when the width is 200Hz and pitch is
400Hz, the notch may wait comfortably on 550Hz.

73 Val LZ1VB

> ...and while they are at it (Wayne told me it was on the list), do
> something  to make it easier for us CW contester ops to use Notch.  
>I wish, when one first turned on Notch, that the default frequency 
>turned up anywhere except at the very extreme upper end of its 
>range where, unfortunately, it is of no value to me.  By the time 
>I dial the notch from 2000HZ to down to where I need it, it's too 
>late when things are moving quickly.  I have found that there are
>contesting occasions in which use of the Notch into a wide
> filter is a better solution than very narrowed filters.
>
> Gary, VE1RGB

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Re: [Elecraft] K3 Notch

[N2TK, Tony]

How about if the manual notch remembered where it was the last time you used
it. That would seem to be a good starting point?

73,
N2TK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Val
Sent: Tuesday, April 27, 2010 10:50 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Notch

I second that. There are a lot of turning to bring the notch from 2000 Hz to
near my pitch of 390 Hz. I would suggest the manual notch to be parked just
outside of the used AF band.  I.e. when the width is 200Hz and pitch is
400Hz, the notch may wait comfortably on 550Hz.

73 Val LZ1VB

> ...and while they are at it (Wayne told me it was on the list), do
> something  to make it easier for us CW contester ops to use Notch.  
>I wish, when one first turned on Notch, that the default frequency 
>turned up anywhere except at the very extreme upper end of its 
>range where, unfortunately, it is of no value to me.  By the time 
>I dial the notch from 2000HZ to down to where I need it, it's too 
>late when things are moving quickly.  I have found that there are
>contesting occasions in which use of the Notch into a wide
> filter is a better solution than very narrowed filters.
>
> Gary, VE1RGB

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Re: [Elecraft] K3 Notch

[Joe Subich, W4TV]

On 4/27/2010 10:50 AM, Val wrote:
 > I second that. There are a lot of turning to bring the notch from
 > 2000 Hz to near my pitch of 390 Hz.

Think about it for a minute ... the notch remembers its last used
frequency except for the first time it is used after the K3 is
turned on.  It it's that critical to you, simply turn on the notch
and set it to 600-800 Hz when you turn on the radio.

73,

... Joe, W4TV

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Re: [Elecraft] W2IHY 8 band equalizer and EQ Plus

[Jim Brown]

On Tue, 27 Apr 2010 10:56:31 -0400, Lu Romero wrote:

>Here Here!  (or Hear Hear):

>Jim, are you a disciple of Frank Foti?  :)

Never heard of him. 

>The best way to fix audio ambient noise issues is through
>your environment's acoustics instead of "fixing it in the
>mix" with processing and gating.

Yes. The noise sources in my shack are the fans in my Ten Tec Titan 
power amps, and a few outboard fans I've added to cool their power 
supplies for high duty-cycle contesting. The Titan fans can get 
pretty noisy, and their case/chassis can amplify their vibrations, 
making them louder. I keep the screws tightened so the lids don't 
vibrate, and I've got both amps (I do SO2R) sitting on soft acoustic 
foam to decouple them from the desktop that they're sitting on. I've 
also placed some absorption on the walls behind the amps. Although I 
haven't measured it, I'd estimate that I've attenuated it by 6dB or 
so. 

>Folks shouldnt forget that we are transmitting into a very
>noisy medium.  High dynamic range defeats intelligibility. 
>SENSIBLE "compression" (RF Clipping) settings are your
>friends, as you then reduce the dynamic range (the
>difference between the loudest and the softest sounds in a
>given audio waveform) and have more "modulation density" to
>rise above the ambient noise on the band.  

EXACTLY! 

>Try to pay attention to the natural acoustics in your
>operating position, if you can.  Curtains help, hard walls
>hurt.  Carpet helps, Terrazo floors hurt.  

More very good advice. The key benefit of this is to reduce the wild 
sound (both noise and wall reflections) that the mic hears. In 
addition to funky carpet on the floor, more absorption is provided 
by walls holding books on shelves. 

73,

Jim K9YC





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Re: [Elecraft] K3 Notch

[gary bartlett]

Change the firmware, or add an uncommon procedural step?
I'm getting too old to remember stuff, Joe.  Let the radio do the work.

73,
Gary, VE1RGB

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV
Sent: April 27, 2010 12:15 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Notch


On 4/27/2010 10:50 AM, Val wrote:
 > I second that. There are a lot of turning to bring the notch from
 > 2000 Hz to near my pitch of 390 Hz.

Think about it for a minute ... the notch remembers its last used
frequency except for the first time it is used after the K3 is
turned on.  It it's that critical to you, simply turn on the notch
and set it to 600-800 Hz when you turn on the radio.

73,

... Joe, W4TV

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Re: [Elecraft] DC-supply for a preamp?

[Lance Collister]

On 4/27/2010 2:32 PM, DM4iM wrote:
> Elecrafters,
> this might be a rig-killer and vy stupid, but
>
> Can i power a 6m masthead-preamp by feeding dc via choke and coupling
> C's to the KXV3A's in/out sockets (where the elecraft preamp is supposed
> to sit), or is this a big NONO?
>
> Martin
>
Hello Martin,

I think you could do better by simply installing the PR6 at the K3 and using 
low 
loss coax to the antenna.  Almost all the 6m EME stations around the world use 
a 
good external preamp in the shack.  If your coax cable loss is 1 dB or less, 
you 
will not gain anything by mounting the 6m preamp at the antenna.

You can model this for yourself in the EME CALCULATOR (accessed from the EME 
ECHO 
MODE screen in the old WSJT Version 4). Because the EME CALCULATOR and EME ECHO 
MODE were never re-written in the language used in more recent revisions of 
WSTJ, 
that old version is still available:

http://www.physics.princeton.edu/pulsar/K1JT/WSJT498.EXE

I think you will find it much simpler to keep the preamp in the shack!  GL and 
VY 
73, Lance

-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, 
E51SIX)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
LIVE MESSENGER CHAT: w...@hotmail.com
2m DXCC #11, 6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the Magic Band EME email!
http://6meme.com/mailman/listinfo/magic_6meme.com
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Re: [Elecraft] DC-supply for a preamp?

[WILLIS COOKE]

Lance, what kind of coax are you using that only has one dB loss at six 
meters?  7/8" Heliax would do it, but LMR-400 would not unless you could keep 
the run under 100 feet.
 Willis 'Cookie' Cooke 
K5EWJ 





From: Lance Collister 
To: DM4iM ; Reflector Elecraft 
Sent: Tue, April 27, 2010 11:25:52 AM
Subject: Re: [Elecraft] DC-supply for a preamp?

On 4/27/2010 2:32 PM, DM4iM wrote:
> Elecrafters,
> this might be a rig-killer and vy stupid, but
>
> Can i power a 6m masthead-preamp by feeding dc via choke and coupling
> C's to the KXV3A's in/out sockets (where the elecraft preamp is supposed
> to sit), or is this a big NONO?
>
> Martin
>
Hello Martin,

I think you could do better by simply installing the PR6 at the K3 and using 
low 
loss coax to the antenna.  Almost all the 6m EME stations around the world use 
a 
good external preamp in the shack.  If your coax cable loss is 1 dB or less, 
you 
will not gain anything by mounting the 6m preamp at the antenna.

You can model this for yourself in the EME CALCULATOR (accessed from the EME 
ECHO 
MODE screen in the old WSJT Version 4). Because the EME CALCULATOR and EME ECHO 
MODE were never re-written in the language used in more recent revisions of 
WSTJ, 
that old version is still available:

http://www.physics.princeton.edu/pulsar/K1JT/WSJT498.EXE

I think you will find it much simpler to keep the preamp in the shack!  GL and 
VY 
73, Lance

-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, 
E51SIX)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728  URL: http://www.bigskyspaces.com/w7gj
LIVE MESSENGER CHAT: w...@hotmail.com
2m DXCC #11, 6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the Magic Band EME email!
http://6meme.com/mailman/listinfo/magic_6meme.com
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[Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

[ALAN GARD]

Hi to the Group.
 
Sorry if this is a bit OT, but here goes.
 
I'm just getting back into data modes (first time on K3), particularly WSPR.  
It's great that the K3 provides Lines In & Out obviating the need for terminal 
units and such.
 
Snag is, the Dell's integral SoundMax, although it has Line In that receives 
well from the K3 Line Out, doesn't seem to have any provision of Line Out that 
I can see.  Just teeing off the line to the usual amplified speakers seems a 
bit crude and adding an outboard sound card is expensive and rather negates the 
K3's advantage.
 
I'd be interested if anyone has found a more elegant way of using this 
particular computer.
 
73 de Alan G4LWA
 
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Re: [Elecraft] DC-supply for a preamp?

[Wes Stewart]

So use 7/8" Heliax :-)

--- On Tue, 4/27/10, WILLIS COOKE  wrote:

> Date: Tuesday, April 27, 2010, 11:02 AM
> Lance, what kind of coax are you
> using that only has one dB loss at six meters?  7/8" Heliax
> would do it, but LMR-400 would not unless you could keep the
> run under 100 feet.
>  Willis 'Cookie' Cooke 
> K5EWJ 
>


  
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Re: [Elecraft] K3 Notch [END of Thread]

[Eric Swartz - WA6HHQ, Elecraft]

Wayne has added this to his f/w list. Let's end the notch freq preset 
thread for now.

73, Eric


On 4/27/2010 9:17 AM, gary bartlett wrote:
> Change the firmware, or add an uncommon procedural step?
> I'm getting too old to remember stuff, Joe.  Let the radio do the work.
>
>   73,
>   Gary, VE1RGB
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV
> Sent: April 27, 2010 12:15 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 Notch
>
>
> On 4/27/2010 10:50 AM, Val wrote:
>   >  I second that. There are a lot of turning to bring the notch from
>   >  2000 Hz to near my pitch of 390 Hz.
>
> Think about it for a minute ... the notch remembers its last used
> frequency except for the first time it is used after the K3 is
> turned on.  It it's that critical to you, simply turn on the notch
> and set it to 600-800 Hz when you turn on the radio.
>
> 73,
>
>  ... Joe, W4TV
>
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Re: [Elecraft] DC-supply for a preamp?

[WILLIS COOKE]

That wouldn't quite reach the ground from my antenna but LMR600 has good 
specs.  How are the connectors to work with?  Do you need a flex jumper at the 
antenna to allow the rotor to work?  I am using 230 feet of RG-213 which has 
about 3.5 loss according to the specs.  It works, but I don't do Moon Bounce 
with it.
 Willis 'Cookie' Cooke 
K5EWJ 





From: Ken Roberson 
To: WILLIS COOKE 
Sent: Tue, April 27, 2010 12:09:15 PM
Subject: Re: [Elecraft] DC-supply for a preamp?

Hello,
I'm using About 65 ft LMR-600, and Elecraft 6M preamp,This
seems to work ok.

73 Ken K5DNL

--

--- On Tue, 4/27/10, WILLIS COOKE  wrote:

> From: WILLIS COOKE 
> Subject: Re: [Elecraft] DC-supply for a preamp?
> To: w...@q.com, "DM4iM" , "Reflector Elecraft" 
> 
> Date: Tuesday, April 27, 2010, 12:02 PM
> Lance, what kind of coax are you
> using that only has one dB loss at six meters?  7/8" Heliax
> would do it, but LMR-400 would not unless you could keep the
> run under 100 feet.
>  Willis 'Cookie' Cooke 
> K5EWJ 
> 
> 
> 
> 
> 
> From: Lance Collister 
> To: DM4iM ;
> Reflector Elecraft 
> Sent: Tue, April 27, 2010 11:25:52 AM
> Subject: Re: [Elecraft] DC-supply for a preamp?
> 
> On 4/27/2010 2:32 PM, DM4iM wrote:
> > Elecrafters,
> > this might be a rig-killer and vy stupid, but
> >
> > Can i power a 6m masthead-preamp by feeding dc via
> choke and coupling
> > C's to the KXV3A's in/out sockets (where the elecraft
> preamp is supposed
> > to sit), or is this a big NONO?
> >
> > Martin
> >
> Hello Martin,
> 
> I think you could do better by simply installing the PR6 at
> the K3 and using low 
> loss coax to the antenna.  Almost all the 6m EME stations
> around the world use a 
> good external preamp in the shack.  If your coax cable
> loss is 1 dB or less, you 
> will not gain anything by mounting the 6m preamp at the
> antenna.
> 
> You can model this for yourself in the EME CALCULATOR
> (accessed from the EME ECHO 
> MODE screen in the old WSJT Version 4). Because the EME
> CALCULATOR and EME ECHO 
> MODE were never re-written in the language used in more
> recent revisions of WSTJ, 
> that old version is still available:
> 
> http://www.physics.princeton.edu/pulsar/K1JT/WSJT498.EXE
> 
> I think you will find it much simpler to keep the preamp in
> the shack!  GL and VY 
> 73, Lance
> 
> -- 
> Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN,
> WA1JXN/C6A, ZF2OC/ZF8, E51SIX)
> P.O. Box 73
> Frenchtown, MT  59834  USA
> QTH: DN27UB
> TEL: (406) 626-5728  URL: http://www.bigskyspaces.com/w7gj
> LIVE MESSENGER CHAT: w...@hotmail.com
> 2m DXCC #11, 6m DXCC #815
> 
> Interested in 6m EME?  Ask me about subscribing to the
> Magic Band EME email!
> http://6meme.com/mailman/listinfo/magic_6meme.com
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> 
> 
>       
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Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

[Wes Stewart]

I read the following when reviewing the specs on your computer:

five connectors for line-in, line-out, microphone, surround, and center/Low 
Frequency Effects (LFE) channel; one front-panel connector for headphones

I don't know what more you would need but maybe it's time for a Signalink USB.

--- On Tue, 4/27/10, ALAN GARD  wrote:

> From: ALAN GARD 
> Subject: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400
> To: "Elecraft Mailman" 
> Date: Tuesday, April 27, 2010, 11:03 AM
> Hi to the Group.
>  
> Sorry if this is a bit OT, but here goes.
>  
> I'm just getting back into data modes (first time on K3),
> particularly WSPR.  It's great that the K3 provides Lines
> In & Out obviating the need for terminal units and
> such.
>  
> Snag is, the Dell's integral SoundMax, although it has Line
> In that receives well from the K3 Line Out, doesn't seem to
> have any provision of Line Out that I can see.  Just teeing
> off the line to the usual amplified speakers seems a bit
> crude and adding an outboard sound card is expensive and
> rather negates the K3's advantage.
>  
> I'd be interested if anyone has found a more elegant way of
> using this particular computer.
>  
> 73 de Alan G4LWA
>  
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Re: [Elecraft] DC-supply for a preamp?

[Lance Collister]

Hello Cookie,

I am using 200' of 1-5/8" Heliax, and used LMR600 for all my phasing lines.  
The 
10' flexible section around the rotor is LMR600UF. I think my total feedline 
loss 
is less than 0.5 dB. Before I found the free piece of big Heliax, I used free 
3/4" 
CATV 75 ohm hardline, which also worked well at keeping the loss down.  7/8" 
Heliax can also frequently be found in these short lengths.

If you can't find any used or end of spool pieces of hardline, new LMR600 has a 
loss of 0.5 dB per 100', so it also is a readily available option.  With all 
these 
options, and the fact that most people have 6m feedlines shorter than 200' 
long, 
it really is getting pretty easy to achieve a feedline loss under 1.0 dB on 6m.

GL and VY 73, Lance

On 4/27/2010 5:02 PM, WILLIS COOKE wrote:
> Lance, what kind of coax are you using that only has one dB loss at six
> meters? 7/8" Heliax would do it, but LMR-400 would not unless you could
> keep the run under 100 feet.
> Willis 'Cookie' Cooke
> K5EWJ
>
>
> 
> *From:* Lance Collister 
> *To:* DM4iM ; Reflector Elecraft
> 
> *Sent:* Tue, April 27, 2010 11:25:52 AM
> *Subject:* Re: [Elecraft] DC-supply for a preamp?
>
> On 4/27/2010 2:32 PM, DM4iM wrote:
>  > Elecrafters,
>  > this might be a rig-killer and vy stupid, but
>  >
>  > Can i power a 6m masthead-preamp by feeding dc via choke and coupling
>  > C's to the KXV3A's in/out sockets (where the elecraft preamp is supposed
>  > to sit), or is this a big NONO?
>  >
>  > Martin
>  >
> Hello Martin,
>
> I think you could do better by simply installing the PR6 at the K3 and
> using low
> loss coax to the antenna. Almost all the 6m EME stations around the
> world use a
> good external preamp in the shack. If your coax cable loss is 1 dB or
> less, you
> will not gain anything by mounting the 6m preamp at the antenna.
>
> You can model this for yourself in the EME CALCULATOR (accessed from the
> EME ECHO
> MODE screen in the old WSJT Version 4). Because the EME CALCULATOR and
> EME ECHO
> MODE were never re-written in the language used in more recent revisions
> of WSTJ,
> that old version is still available:
>
> http://www.physics.princeton.edu/pulsar/K1JT/WSJT498.EXE
>
> I think you will find it much simpler to keep the preamp in the shack!
> GL and VY
> 73, Lance
>
> --
> Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A,
> ZF2OC/ZF8, E51SIX)
> P.O. Box 73
> Frenchtown, MT 59834 USA
> QTH: DN27UB
> TEL: (406) 626-5728 URL: http://www.bigskyspaces.com/w7gj
> LIVE MESSENGER CHAT: w...@hotmail.com 
> 2m DXCC #11, 6m DXCC #815
>
> Interested in 6m EME? Ask me about subscribing to the Magic Band EME email!
> http://6meme.com/mailman/listinfo/magic_6meme.com
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-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, 
E51SIX)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
LIVE MESSENGER CHAT: w...@hotmail.com
2m DXCC #11, 6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the Magic Band EME email!
http://6meme.com/mailman/listinfo/magic_6meme.com
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Re: [Elecraft] DC-supply for a preamp?

[Lance Collister]

Hello Cookie,

Wow - you must have a HUGE tower!  More power to you ;-)  Yes, I use LMR600UF 
(Ultra Flex) around the rotor...you can't use cable with a solid center 
conductor 
in an application requiring repeated flexing.  The special connectors work 
fine, 
but you have to take some care and make sure you put them on properly.  I just 
take my time when I have to put them on...it is worth it to have such low loss 
cable!  I agree...you won't do much weak signal work with 3.5 dB loss ahead of 
the 
preamp!  GL and VY 73, Lance

On 4/27/2010 5:37 PM, WILLIS COOKE wrote:
> That wouldn't quite reach the ground from my antenna but LMR600 has good 
> specs.
> How are the connectors to work with?  Do you need a flex jumper at the antenna
> to allow the rotor to work?  I am using 230 feet of RG-213 which has about 3.5
> loss according to the specs.  It works, but I don't do Moon Bounce with it.
> Willis 'Cookie' Cooke K5EWJ
>
>
-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, 
E51SIX)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
LIVE MESSENGER CHAT: w...@hotmail.com
2m DXCC #11, 6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the Magic Band EME email!
http://6meme.com/mailman/listinfo/magic_6meme.com
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[Elecraft] [K3] New Amp

[srife]

Is there any information for the new amp on the website yet?


Stan
W5EWA
Houston, TX
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Re: [Elecraft] K3 Notch

[David Cutter]

I would go for default to the sidetone frequency
David
G3UNA





>
> ...and while they are at it (Wayne told me it was on the list), do 
> something
> to make it easier for us CW contester ops to use Notch.  I wish, when one
> first turned on Notch, that the default frequency turned up anywhere 
> except
> at the very extreme upper end of its range where, unfortunately, it is of 
> no
> value to me.  By the time I dial the notch from 2000HZ to down to where I
> need it, it's too late when things are moving quickly.  I have found that
> there are contesting occasions in which use of the Notch into a wide 
> filter
> is a better solution than very narrowed filters.
>
> When in CW Mode it should default to somewhere closer to where a person
> needs it -- i.e., inside the limits of whatever filter is in play.  Or why
> not default to the rig's selected side-tone pitch?  That way an op would
> know exactly where to go with the Notch control when first turned on. 
> Even
> if the *Notch Go-to-2000HZ* command were turned OFF inside the radio and 
> the
> Notch left where last used would be better.  Anything.
>
> I believe that I can show that the K3 Notch was better when the rig was
> first new, before an early firmware update came along and broke it by 
> moving
> the CW Notch default up to 2Khz.  This is the first radio that I've owned 
> in
> which I have used the Notch and found Lyle's work so satisfying that I've
> worked that control into the way I operate (when I think of it).   I bet
> it's wasted on a lot CW ops because it is slow and awkward to employ.
>
> Here's an ergonomic issue:  I sometimes wonder if the Notch switch could 
> be
> changed such that it goes into the Manual Adjust mode with a PUSH of the
> Notch button, rather than requiring a HOLD because, for whatever reason, 
> my
> first attempt at using the Notch button invariably is usually wrong, and
> besides my way is faster.
>
> Gary, VE1RGB
>
>
> -Original 

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Re: [Elecraft] K3 Notch

[gary bartlett]

Little guy 100W CW contester's perspective only, Joe.  I REALLY NEED that
notch about once per every 500 Qs.  Once a contest, say.I'll never train
myself to set the radio up to compensate for an odd and unnecessary K3
attribute on the basis of that frequency of use.  I think my contest
preparation time could be better spent other than remembering untraditional
manual work-arounds which could be easily automated.  Neither do I have the
time nor the presence of mind to figure out how to use the notch feature all
over again in every contest.  Accordingly, the K3 Notch goes too often
unused here.  Pity.  Not a fine point to me, anyway, because my 100W and
wires need all the help they can get, and missing a multiplier for want of a
quickly accessible K3 notch would be a real shame.  

 

As for the compromise frequency argument, that's nice, but it still makes no
sense from a CW guy's point of view.  A notch up in the SSB/audio range
doesn't work well for us. We are still miles and numerous knob twists away
from where we want to be.  

 

As a separate issue, I still see nothing wrong with my argument that if the
K3 is in CW mode, one should be able to go directly into and out of Notch
Manual Adjust by either a TAP or a HOLD.  The middle position of Notch TAP,
which produces a fixed/can't-adjust-it/same-as-last-time notch, is not
necessary. My approach is faster of its own merit, and it also eliminates
the lost time when a guy forgets which is which when he makes that rare
Notch selection.

 

No big deal, anyway.  I just like Lyle's notch, it has occasional genuine
value to a CW op, and I think Elecraft should facilitate its use because
it's a K3 attribute.  And besides, Wayne promised.  I convinced him of the
default frequency change some time ago, he told me it was on the list, and I
believe him. 

 

Someone else started this K3 Notch thing recently and I just took the
opportunity to pile on to elevate the visibility of my own selfish wants
(I've seen it done before).  It's been on the list quite a while, although I
recognize that the needs of this station are likely much different from the
majority.  Perhaps I should now give the channel remote control back to its
original owners, especially since my day-pass from the Institution for
Unstable Contester's has nearly expired.

 

73,

Gary, VE1RGB

 

 

 

-Original Message-
From: Joe Subich, W4TV [mailto:li...@subich.com] 
Sent: April 27, 2010 1:35 PM
To: gary bartlett ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Notch

 

 

 

 

It's set the notch the first time you use it ... what's hard

about that...as it is, the notch defaults to the

middle of its 200 - 3900 Hz range - that's not a bad design.

 

 

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Re: [Elecraft] K3 Notch

[George & Jan]

Please keep tap for Auto at least in SSB
George
AI4VZ


I would go for default to the sidetone frequency
David
G3UNA

 
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Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

[Joe Subich, W4TV]

 > Snag is, the Dell's integral SoundMax, although it has Line In
 > that receives well from the K3 Line Out, doesn't seem to have
 > any provision of Line Out that I can see.  Just teeing off the
 > line to the usual amplified speakers seems a bit crude and
 > adding an outboard sound card is expensive and rather negates
 > the K3's advantage.

I don't know that adding an outboard (USB) soundcard is necessarily
expensive and there are some significant advantages in a separate
soundcard connected to the radio.  If all you need is the sound
card (that is you don't want additional functions like rig control
or voice keyer, etc.) you can get a pure USB soundcard for less
that $25:

For "digital mode" use only, a C-Media based  "dongle" with combined
line/mic in and stereo line out is less that $20:
http://www.newegg.com/Product/Product.aspx?Item=N82E16829128002

If you want separate mic and line in for use with contest software
like WriteLog or N1MM Logger, a suitable device is the GWC AA 1500
for $22 or Encore ENMAB-8CM for $25:
http://www.newegg.com/Product/Product.aspx?Item=N82E16829126101
http://www.newegg.com/Product/Product.aspx?Item=N82E16829180006

Neither device is a "high end" soundcard and will not compete with
the e-mu and m-Audio devices used with LP-Pan or Softrock for
panadapter operation but they are solid mid-performance devices
that provide more than adequate performance for amateur audio based
digital modes (e.g. Line in/Line Out operation).


73,

... Joe, W4TV

On 4/27/2010 1:03 PM, ALAN GARD wrote:
> Hi to the Group.
>
> Sorry if this is a bit OT, but here goes.
>
> I'm just getting back into data modes (first time on K3), particularly WSPR.  
> It's great that the K3 provides Lines In&  Out obviating the need for 
> terminal units and such.
>
> Snag is, the Dell's integral SoundMax, although it has Line In that receives 
> well from the K3 Line Out, doesn't seem to have any provision of Line Out 
> that I can see.  Just teeing off the line to the usual amplified speakers 
> seems a bit crude and adding an outboard sound card is expensive and rather 
> negates the K3's advantage.
>
> I'd be interested if anyone has found a more elegant way of using this 
> particular computer.
>
> 73 de Alan G4LWA
>
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Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

[George A. Thornton]

I recently went through all this.  

A Signalink is not  necessary since the K3 already does internally what the 
Singalink does other than the sound card.  They run about $100.

I was warned away from the cheapest USB sound card dongles and I ended up 
spending about $30 for something with a volume control.  It works fine.

Need to play with audio levels.  

I used Ham Radio Deluxe and DM780.  

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of ALAN GARD
Sent: Tuesday, April 27, 2010 10:04 AM
To: Elecraft Mailman
Subject: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

Hi to the Group.
 
Sorry if this is a bit OT, but here goes.
 
I'm just getting back into data modes (first time on K3), particularly WSPR.  
It's great that the K3 provides Lines In & Out obviating the need for terminal 
units and such.
 
Snag is, the Dell's integral SoundMax, although it has Line In that receives 
well from the K3 Line Out, doesn't seem to have any provision of Line Out that 
I can see.  Just teeing off the line to the usual amplified speakers seems a 
bit crude and adding an outboard sound card is expensive and rather negates the 
K3's advantage.
 
I'd be interested if anyone has found a more elegant way of using this 
particular computer.
 
73 de Alan G4LWA
 
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Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

[Dickinson, Joe]

I was thinking of getting the signalLink for the K2



-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of George A. Thornton
Sent: Tuesday, April 27, 2010 2:33 PM
To: ALAN GARD; Elecraft Mailman
Subject: Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

I recently went through all this.  

A Signalink is not  necessary since the K3 already does internally what the 
Singalink does other than the sound card.  They run about $100.

I was warned away from the cheapest USB sound card dongles and I ended up 
spending about $30 for something with a volume control.  It works fine.

Need to play with audio levels.  

I used Ham Radio Deluxe and DM780.  

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of ALAN GARD
Sent: Tuesday, April 27, 2010 10:04 AM
To: Elecraft Mailman
Subject: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

Hi to the Group.
 
Sorry if this is a bit OT, but here goes.
 
I'm just getting back into data modes (first time on K3), particularly WSPR.  
It's great that the K3 provides Lines In & Out obviating the need for terminal 
units and such.
 
Snag is, the Dell's integral SoundMax, although it has Line In that receives 
well from the K3 Line Out, doesn't seem to have any provision of Line Out that 
I can see.  Just teeing off the line to the usual amplified speakers seems a 
bit crude and adding an outboard sound card is expensive and rather negates the 
K3's advantage.
 
I'd be interested if anyone has found a more elegant way of using this 
particular computer.
 
73 de Alan G4LWA
 
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[Elecraft] Data Modes Software for Mac

[David Guernsey]

Thinking about trying data modes (RTTY and PSK31) with my new K3.  Does anyone 
have any recommendations for software for Mac OS X for data modes?  Using a Mac 
Mini with my K3 Utility program.

 73s de Dave KJ6CBS



  
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Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

[Joe Subich, W4TV]

On 4/27/2010 4:52 PM, Dickinson, Joe wrote:
 > I was thinking of getting the signalLink for the K2

Why bother?  Add Don's fixed level output and use one of the
$20 - $25 USB soundcards.  A lot less expensive and every bit
as effective/functional as the Signalink.   If you need the
automatic soundcard VOX make up the KH6TY interface from QST
without the transformers (circuit boards from Far Circuits)
- still a lot less expensive than Signalink.

73,

... Joe, W4TV

On 4/27/2010 4:52 PM, Dickinson, Joe wrote:
> I was thinking of getting the signalLink for the K2
>
>
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of George A. Thornton
> Sent: Tuesday, April 27, 2010 2:33 PM
> To: ALAN GARD; Elecraft Mailman
> Subject: Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400
>
> I recently went through all this.
>
> A Signalink is not  necessary since the K3 already does internally what the 
> Singalink does other than the sound card.  They run about $100.
>
> I was warned away from the cheapest USB sound card dongles and I ended up 
> spending about $30 for something with a volume control.  It works fine.
>
> Need to play with audio levels.
>
> I used Ham Radio Deluxe and DM780.
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of ALAN GARD
> Sent: Tuesday, April 27, 2010 10:04 AM
> To: Elecraft Mailman
> Subject: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400
>
> Hi to the Group.
>
> Sorry if this is a bit OT, but here goes.
>
> I'm just getting back into data modes (first time on K3), particularly WSPR.  
> It's great that the K3 provides Lines In&  Out obviating the need for 
> terminal units and such.
>
> Snag is, the Dell's integral SoundMax, although it has Line In that receives 
> well from the K3 Line Out, doesn't seem to have any provision of Line Out 
> that I can see.  Just teeing off the line to the usual amplified speakers 
> seems a bit crude and adding an outboard sound card is expensive and rather 
> negates the K3's advantage.
>
> I'd be interested if anyone has found a more elegant way of using this 
> particular computer.
>
> 73 de Alan G4LWA
>
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Re: [Elecraft] Data Modes Software for Mac

[David M. Elliott]

Dave,  

One of the beauties of the K3 is that it does these mode all by itself.  All 
you need is K3 utility for Mac and use the terminal.

73 de W6BK


On Apr 27, 2010, at 2:01 PM, David Guernsey wrote:

> Thinking about trying data modes (RTTY and PSK31) with my new K3.  Does 
> anyone have any recommendations for software for Mac OS X for data modes?  
> Using a Mac Mini with my K3 Utility program.
> 
> 73s de Dave KJ6CBS
> 
> 
> 
> 
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Re: [Elecraft] Data Modes Software for Mac

[Darin Land]

Try CoccoaModem:

http://homepage.mac.com/chen/w7ay/cocoaModem/index.html


73,
Darin - k6osx

On 4/27/2010 2:01 PM, David Guernsey wrote:
> Thinking about trying data modes (RTTY and PSK31) with my new K3.  Does 
> anyone have any recommendations for software for Mac OS X for data modes?  
> Using a Mac Mini with my K3 Utility program.
>
>   73s de Dave KJ6CBS
>
>
>
>
> __
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Re: [Elecraft] Data Modes Software for Mac

[David Herring, K6DCH]

David,

I personally use fldigi with great results. Others like cocoamodem.

Try them both and see which you prefer.

73,

Dave, K6DCH

Sent from my iPhone

On Apr 27, 2010, at 11:01 AM, David Guernsey  wrote:

> Thinking about trying data modes (RTTY and PSK31) with my new K3.   
> Does anyone have any recommendations for software for Mac OS X for  
> data modes?  Using a Mac Mini with my K3 Utility program.
>
> 73s de Dave KJ6CBS
>
>
>
>
> __
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Re: [Elecraft] FOR SALE: ELecraft W1 Wattmeter Kit--SOLD

[Elliott Lawrence]

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Re: [Elecraft] Data Modes Software for Mac

[lstavenhagen]

I'll second cocoaModem as I've used it a bit with my Mac/K3 (tho I'm short on
computers right now and am confined to an indoor antenna which severly
limits my ability to use a computer with my K3). It's excellent, IMO, and
has modems for a bunch of different modes (W7AY is also a career specialist
in this kind of work so it's no surprise that the data modes on it work
really well). It's very easy to use and really works superbly.

RUMlog is also a nice logging app with built-in keyers for CW and PSK, it
has some integration with cocoaModem as well. It talks to the rig through a
USB->RS232 adaptor, tho, so you'll need one of those to use it with the K3.

cocoaModem, tho, only requires audio cables between your sound card and the
line in/outs on the K3 (just key the rig with VOX). 

73,
LS
W5QD
-- 
View this message in context: 
http://elecraft.365791.n2.nabble.com/Data-Modes-Software-for-Mac-tp4971040p4971477.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] Data Modes Software for Mac

[Joe Subich, W4TV]

cocoaModem has the better demodulators and a "Macintosh" interface.
fldigi has more modes/protocols but an interface that Mac purists
hate.

cocoaModem will inter-operate seamlessly with MacLoggerDX - the
premiere Macintosh logging software while fldigi will not cooperate
with anything!

Either will work just fine on an Intel based Mac Mini (which is
what I use for my Apple testing/support).

73,

... Joe, W4TV

On 4/27/2010 5:01 PM, David Guernsey wrote:
> Thinking about trying data modes (RTTY and PSK31) with my new K3.
 > Does anyone have any recommendations for software for Mac OS X for
 > data modes?  Using a Mac Mini with my K3 Utility program.
>
>   73s de Dave KJ6CBS
>
>
>
>
> __
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Re: [Elecraft] Data Modes Software for Mac

[Rick Prather]

I have used MacLoggerDX and cocoaModem for years and use RUMlog for sorting
out my QSL's and packet alerts based on my needs.

Since RUMlog has now incorporated some excellent K3 access it has become my
primary logger and also with it's tight integration with the K3 and
cocoaModem it's my main data mode engine.

RUMlog has an info panel with a bunch of information taken from the K3 and
also access to M1-M8 for either  CW or SSB DVR.  And, it also has 10 buttons
that you can use to key Macros.

I still use MacLoggerDX for it's look and feel and QRZ.com linking so I wind
up running both loggers and cocoaModem.

Rick
K6LE


On 4/27/2010, at 3:32 , Joe Subich, W4TV wrote:

On Tue, Apr 27, 2010 at 3:32 PM, Joe Subich, W4TV  wrote:

>
> cocoaModem has the better demodulators and a "Macintosh" interface.
> fldigi has more modes/protocols but an interface that Mac purists
> hate.
>
> cocoaModem will inter-operate seamlessly with MacLoggerDX - the
> premiere Macintosh logging software while fldigi will not cooperate
> with anything!
>
> Either will work just fine on an Intel based Mac Mini (which is
> what I use for my Apple testing/support).
>
> 73,
>
>... Joe, W4TV
>
> On 4/27/2010 5:01 PM, David Guernsey wrote:
> > Thinking about trying data modes (RTTY and PSK31) with my new K3.
>  > Does anyone have any recommendations for software for Mac OS X for
>  > data modes?  Using a Mac Mini with my K3 Utility program.
> >
> >   73s de Dave KJ6CBS
> >
> >
> >
> >
> > __
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> >
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Re: [Elecraft] Just got a K1 4 band K1 kit

[Sandy]

Rob,

If you plan to use it for contesting I'd set it up for 40/30/20/15 meters 
rather than 40/30/20/17 meters, as the newer WARC bands are not usually used 
for contests.

I have two additional 2 band boards for my old 4 band K1: one for 160/80, 
and another for 80/40 meters.  Usually the 80/40 meter board stays in during 
the winter and the 4 band board is used during the summer when people seem 
scared by the QRN on 80 at night!  The 160/80 meter board gets used during 
periods of high 160 meter activity in midwinter.

73,

Sandy W5TVW

- Original Message - 
From: "Rob @ Peg Pohorence" 
To: 
Sent: Monday, April 26, 2010 8:33 PM
Subject: [Elecraft] Just got a K1 4 band K1 kit


Hello All,
Want to Buy ELECRAFT K1 Options, I
 have a Stock, 4 bans kit , and getting ready to build it! What options do 
you
have for the Elecraft K1. that you are not using?
thanks rob
n8rt

Sincerely, Rob N8RT.com , Peggy , and Maggie Sue Papillion  "No Man is a 
Failure, who has Friends" From: It's a Wonderful Life





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No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.814 / Virus Database: 271.1.1/2836 - Release Date: 04/26/10 
01:31:00

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[Elecraft] QSK THUMPS?

[eric manning]

When my K3 switches between T & R in full QSK mode, I hear audio thumps.
[The tramsmitted signal is apparently clean with no clicks; I always get 
good signal quality reports.]

Now, My K2 has no such thumps; you can't tell when the radio switches 
between T & R  by listening to the audio.
The transmitted cw sidetone sounds just like any other cw signal, with 
no thumps or other noise.

 I would like my K3 to be the same.

Is there anything I can do to attenuate the K3's audio thumps?

eric
VA7DZ

K3 3620 +
500 W  ICOM amp




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This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

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Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

[Don Wilhelm]

Joe,

I am assuming you are referring to the W3FPR Don's Fixed Audio Output 
fpr the K2. 

Yes, that is a good solution, but unfortunately, there are no more 
boards available for purchase.  Tom Hammond has the board layout and 
other info on his website www.n0ss.net for the boards that fit between 
the K2 front panel and the Control Board, and my website www.w3fpr.com 
has information about the original design.  Tom has the board layout, 
and is willing to provide it to anyone interested.  Actually, the 
circuit is not complex and can be quickly implemented on perfboard for a 
one-off implementation.

If you experience hum or other audio problems with a direct connection 
to the computer, you may follow the advice of Jim Brown K9YC for curing 
that condition, or just add transformers in the path (transformers from 
defunct computer modem cards work well).

The K3 has line-in and line-out connectors built in, along eith 
isolation transformers - the K2 does not, it was designed before the 
popularity of digital modes (other than RTTY)

73,
Don W3FPR


Joe Subich, W4TV wrote:
> On 4/27/2010 4:52 PM, Dickinson, Joe wrote:
>  > I was thinking of getting the signalLink for the K2
>
> Why bother?  Add Don's fixed level output and use one of the
> $20 - $25 USB soundcards.  A lot less expensive and every bit
> as effective/functional as the Signalink.   If you need the
> automatic soundcard VOX make up the KH6TY interface from QST
> without the transformers (circuit boards from Far Circuits)
> - still a lot less expensive than Signalink.
>
> 73,
>
> ... Joe, W4TV
>
> On 4/27/2010 4:52 PM, Dickinson, Joe wrote:
>   
>> I was thinking of getting the signalLink for the K2
>>
>>
>>
>> -Original Message-
>> From: elecraft-boun...@mailman.qth.net 
>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of George A. Thornton
>> Sent: Tuesday, April 27, 2010 2:33 PM
>> To: ALAN GARD; Elecraft Mailman
>> Subject: Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400
>>
>> I recently went through all this.
>>
>> A Signalink is not  necessary since the K3 already does internally what the 
>> Singalink does other than the sound card.  They run about $100.
>>
>> I was warned away from the cheapest USB sound card dongles and I ended up 
>> spending about $30 for something with a volume control.  It works fine.
>>
>> Need to play with audio levels.
>>
>> I used Ham Radio Deluxe and DM780.
>>
>> -Original Message-
>> From: elecraft-boun...@mailman.qth.net 
>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of ALAN GARD
>> Sent: Tuesday, April 27, 2010 10:04 AM
>> To: Elecraft Mailman
>> Subject: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400
>>
>> Hi to the Group.
>>
>> Sorry if this is a bit OT, but here goes.
>>
>> I'm just getting back into data modes (first time on K3), particularly WSPR. 
>>  It's great that the K3 provides Lines In&  Out obviating the need for 
>> terminal units and such.
>>
>> Snag is, the Dell's integral SoundMax, although it has Line In that receives 
>> well from the K3 Line Out, doesn't seem to have any provision of Line Out 
>> that I can see.  Just teeing off the line to the usual amplified speakers 
>> seems a bit crude and adding an outboard sound card is expensive and rather 
>> negates the K3's advantage.
>>
>> I'd be interested if anyone has found a more elegant way of using this 
>> particular computer.
>>
>> 73 de Alan G4LWA
>>
>> __
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>> __
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>> 
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Re: [Elecraft] K3: Driving Data Modes Using Dell Dimension 8400

[2Cents]

I built and installed one of Don's Fixed Audio Outputs on perfboard a month
or so back, and it works beautifully.  Thanks, Don!

Chuck, NN7U

 >I am assuming you are referring to the W3FPR Don's Fixed Audio Output 
fpr the K2. 

Yes, that is a good solution, but unfortunately, there are no more 
boards available for purchase.  Tom Hammond has the board layout and 
other info on his website www.n0ss.net for the boards that fit between 
the K2 front panel and the Control Board, and my website www.w3fpr.com 
has information about the original design.  Tom has the board layout, 
and is willing to provide it to anyone interested.  Actually, the 
circuit is not complex and can be quickly implemented on perfboard for a 
one-off implementation.

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[Elecraft] Qsk Thumps

[Toby Pennington]

Best way to eliminate this is to set the rig to semi BK IN,  and turn the delay 
to a setting of 2. 
This should give you good QSK CW. 

Toby  W4CAK
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[Elecraft] FW: QSK THUMPS?

[The Smiths]

I've heard this as well.  Mostly when doing QSK with the Sub Receiver on, and 
even more so when in Diversity Mode.  I think that it has to do with your 
Xmitted signal being heard by the receiver.  Wayne had adjusted this at one 
time, but it seems to be an issue again.  
I find that if I turn on the NB it helps reduce it.


 

 
> Date: Tue, 27 Apr 2010 17:07:06 -0700
> From: eric.mann...@engr.uvic.ca
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] QSK THUMPS?
> 
> When my K3 switches between T & R in full QSK mode, I hear audio thumps.
> [The tramsmitted signal is apparently clean with no clicks; I always get 
> good signal quality reports.]
> 
> Now, My K2 has no such thumps; you can't tell when the radio switches 
> between T & R by listening to the audio.
> The transmitted cw sidetone sounds just like any other cw signal, with 
> no thumps or other noise.
> 
> I would like my K3 to be the same.
> 
> Is there anything I can do to attenuate the K3's audio thumps?
> 
> eric
> VA7DZ
> 
> K3 3620 +
> 500 W ICOM amp
> 
> 
> 
> 
> -- 
> This message has been scanned for viruses and
> dangerous content by MailScanner, and is
> believed to be clean.
> 
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The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with 
Hotmail. Get busy.
  
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Re: [Elecraft] FW: QSK THUMPS?

[Paul Christensen]

Thumps are often a symptom of RF ingress in the audio stage.  Is the thump 
effect reduced as the K3's transmit power is reduced?

Paul, W9AC


- Original Message - 
From: "The Smiths" 
To: "Elecraft Reflector" 
Sent: Tuesday, April 27, 2010 9:45 PM
Subject: [Elecraft] FW: QSK THUMPS?


>
>
>
> I've heard this as well.  Mostly when doing QSK with the Sub Receiver on, 
> and even more so when in Diversity Mode.  I think that it has to do with 
> your Xmitted signal being heard by the receiver.  Wayne had adjusted this 
> at one time, but it seems to be an issue again.
> I find that if I turn on the NB it helps reduce it.
>
>
>
>
>
>> Date: Tue, 27 Apr 2010 17:07:06 -0700
>> From: eric.mann...@engr.uvic.ca
>> To: elecraft@mailman.qth.net
>> Subject: [Elecraft] QSK THUMPS?
>>
>> When my K3 switches between T & R in full QSK mode, I hear audio thumps.
>> [The tramsmitted signal is apparently clean with no clicks; I always get
>> good signal quality reports.]
>>
>> Now, My K2 has no such thumps; you can't tell when the radio switches
>> between T & R by listening to the audio.
>> The transmitted cw sidetone sounds just like any other cw signal, with
>> no thumps or other noise.
>>
>> I would like my K3 to be the same.
>>
>> Is there anything I can do to attenuate the K3's audio thumps?
>>
>> eric
>> VA7DZ
>>
>> K3 3620 +
>> 500 W ICOM amp
>>
>>
>>
>>
>> -- 
>> This message has been scanned for viruses and
>> dangerous content by MailScanner, and is
>> believed to be clean.
>>
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>
>
>
>
>
>
>
> The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with 
> Hotmail. Get busy.
>
> _
> The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with 
> Hotmail.
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No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.437 / Virus Database: 271.1.1/2839 - Release Date: 04/27/10 
18:27:00

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[Elecraft] K2 full power delay on CW

[J.A. Wolf, MD, K6JW]

I recently acquired a used K2 (looks nice next to my K3), but I've noticed 
something that might be of concern with it. When I enter CW mode and key down 
for the first time, there's a short delay (a split second) for the power to 
come up to full output, as indicated on my Alpha wattmeter. For instance, if 
I'm set to full 100 watt output, initial key down might start at 92-94 watts 
and then quickly go to full output. After the initial key down, all further 
sending puts out full power instantaneously. If I change modes and then come 
back to CW, the first key down will cause the behavior to repeat. This doesn't 
seem to be a big problem -- I'm getting excellent signal reports -- but I'm 
curious as to whether I should be concerned. Has anyone else on the reflector 
seen this?
--Jeff, K6JW
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Re: [Elecraft] QSK THUMPS?

[Bill Coleman]

On Apr 27, 2010, at 8:07 PM, eric manning wrote:

> Now, My K2 has no such thumps; you can't tell when the radio switches 
> between T & R  by listening to the audio.
> The transmitted cw sidetone sounds just like any other cw signal, with 
> no thumps or other noise.

I'm curious -- what is the T-R setting on our K2 set to? 

If I set it to a high value -- say 150 (which I sometimes do when I'm using my 
non-QSK AL-80A amplifier), I don't get any thumps, but I wouldn't call it QSK 
by any means.

If I set the T-R setting to something less than about 8, I can start to hear 
some anomalous stuff -- some minor thumps, and if I turn it down lower, I hear 
more. At settings below 2, you can even get some off-frequency receiver 
response. (ie you'll hear adjacent signals while keying, which stops the minute 
you stop keying)

Bill Coleman, AA4LR, PP-ASELMail: aa...@arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901

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[Elecraft] W2IHY 8 band equalizer and EQ Plus

[Bob McGraw - K4TAX]

> One of the things we often fail to implement is the transmit bandwidth 
> being adjusted much like the receiving bandwidth on the other end.  In a 
> contest situation likely the receiving station is using a 1500 to 1800 Hz 
> receiver bandwidth with likely band pass tuning such that the lower 300 to 
> 500 Hz of that is attenuated.  This makes for an effective receive 
> bandwidth of some 1300 Hz or so.
>
> Now then with our transmitter setting for a "full width" normal SSB 
> bandwidth of say 2.6 or 2.8 KHz and a low end roll off of say 120 Hz this 
> make for an effective bandwidth of some 2600 Hz.  Yes our transmitter 
> power is spread over that bandwidth.  Wouldn't it make more sense to 
> concentrate the transmitter power over say 1300 Hz rather than 2600 Hz? 
> In doing so one gains almost 3 dB of effective power increase with 
> actually no increase in PEP.  Plus the other folks on the band will 
> appreciate the narrow signals.
>
> Yes of course it will sound pinched up but in reality there is little 
> information in the male voice spoken range below 400 Hz and little above 
> 1500 to 1800 Hz.  But hey, some of the compressed and processed signals 
> only serve to occupy the full 2600 Hz of bandwidth, with what?  It's not 
> pretty for sure.  So if you want a screaming DX pileup busting signal, 
> squeeze in the bandwidth and don't worry about the EQ or the special 
> purpose mike. Your good sounding SSB mike into that transmitter bandwidth 
> will do the job just fine and the neighbors on either side of your 
> frequency will appreciate your efforts.
>
> 73
> Bob, K4TAX
>
>
> - Original Message - 
> From: "Lu Romero" 
> To: <"Elecraft List 
> Sent: Tuesday, April 27, 2010 9:56 AM
> Subject: Re: [Elecraft] W2IHY 8 band equalizer and EQ Plus
>
>
>> Here Here!  (or Hear Hear):
>>
>> Jim, are you a disciple of Frank Foti?  :)
>>
>> I like Julius' gear, and I have worked with the EQPlus
>> device at the NQ4I Multi Multi station on Rick's Orions.
>> This box does make those radios sound quite good, especially
>> with just a hint of "Delay" dialed in.
>>
>> I do find that the noise gate on the K3 has a "crackling"
>> sound when muting and unmuting, making somewhat useless to
>> me (if you pay attention to that nuance... I do.  Otherwise,
>> it works just fine) Lyle has done a great job with the TX
>> chain on the K3... I would like to see some handles on
>> Attack and Release as well as ratio, but then that could be
>> painful to use if you dont know what youre doing.  RF
>> Clipper's attack and decay characteristics are rather
>> generalised.
>>
>> The best way to fix audio ambient noise issues is through
>> your environment's acoustics instead of "fixing it in the
>> mix" with processing and gating.
>>
>> Folks shouldnt forget that we are transmitting into a very
>> noisy medium.  High dynamic range defeats intelligibility.
>> SENSIBLE "compression" (RF Clipping) settings are your
>> friends, as you then reduce the dynamic range (the
>> difference between the loudest and the softest sounds in a
>> given audio waveform) and have more "modulation density" to
>> rise above the ambient noise on the band.
>>
>> Tailoring your frequency response to concentrate power in a
>> given voice range will go a long way to making your signal
>> "pop" out of the noise.  Close talk the mic as much as
>> possible and reduce the mic gain as Jim describes.
>>
>> A good example on how all these parameters work together to
>> make your signal stand out can be gleaned by downloading
>> VE3NEA's excellent "Voice Shaper" simulator program (its
>> free).  Use your favorite air mic and play with it for a
>> while to get an understanding of how gates,
>> compressor/limiters and EQ affect your signal in QRM and QRN
>> conditions.
>>
>> Try to pay attention to the natural acoustics in your
>> operating position, if you can.  Curtains help, hard walls
>> hurt.  Carpet helps, Terrazo floors hurt.  Try to set your
>> operating position and/or microphone somewhat at an angle
>> between hard reflecting walls to reduce phase cancelling or
>> adding from the reflecting walls/surfaces.
>>
>> Personally, I am not a believer in ESSB.  But different
>> strokes for different folks, and I wont criticise folks who
>> practice this "voodoo" until they become 8kHz wide and QRM
>> me or I am able to understand them when listening to their
>> SSB signal in AM mode (all that bass often creates a "pseudo
>> carrier").
>>
>> You would be surprised how well you can be heard using the
>> built in features provided by Elecraft in the K3.  It takes
>> practice and a commitment to resist the temptation to "turn
>> it up to eleven".
>>
>> -lu-W4LT-
>>
>>
>> Date: Mon, 26 Apr 2010 10:57:04 -0700
>> From: "Jim Brown" 
>> Subject: Re: [Elecraft] W2IHY 8 band equalizer and EQ Plus
>> To: "Elecraft List" 
>> Message-ID: <20100426175705.d90c957...@gw1.nlenet.net>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> On Mon, 26 Apr 2010 16:18:01 +000

Re: [Elecraft] W2IHY 8 band equalizer and EQ Plus

[Lu Romero]

Bob:  This is becoming somewhat off topic...

While I agree in principle, in practice, there are some high
frequency sibilance "formants" that need bandwidth up to and
including 2.8kHz to almost 3kHz to be well understood. 
There are also some harmonics, especially in male voices,
that go down below 300-400 Hz.  This is all variable with
each person's individual voice, so YMMV.

Joe, W4TV, clued me in to a small nuance that I had
completely neglected a few months back.  He listened to my
EQ settings and mentioned that my audio was punchy but
"thin" as he put it.  I listened to a recording that AD4C
made of me and I realized that I was clipping off some low
harmonics by completely dropping everything below 400Hz.  

I now add a little +3dB bump to my EQ settings around 200Hz.
 It gives me some added "presence".  That little hump sort
of "fattens" my voice and helps lift it over hissy band
noise a bit.  Im setting up the NQ4I Orions the same way,
too, and its made quite a difference.  

I also like a little hint of "Harmonic Distortion" in my
audio, especially in the DVK.  Just my personal preference,
it adds what I call "edge" to the a CQ Message Loop.  My
TS850 did this with "high boost" on by itself, and I can
duplicate it with the MicroKeyer's recording path.  I record
ALL DVK through the MicroKeyer's recording facility now,
with consistently repeatable results.  I play out through
N1MM's DVK through the MicroKeyer2's soundcard.

I have almost gotten used to the "different" EQ band center
frequencies in the K3 Equalizer, too  :) 

I have owned K3 #3192 for almost 6 months now.  It has taken
me almost all that time to feel comfortable with the audio
chain to the extent that I was comfortable with my former
TS850S equipped with a slew of Behringer and Radio Design
Labs outboard processing toys.  

The only things that I would add to the K3 transmitter
processing chain would be a bit more headroom, a Pre-DSP two
band audio leveler/AGC and handles for Attack, Decay and
Ratio on the RF Clipper.  If Lyle could do this I would kiss
the ring!

They should hold a seminar on this at Elecraft and not let
anybody access the last three adjustments until they passed
a certification test, however!  It would be like giving
Nuclear Missiles to Mohmar Khadaffi in the hands of the
uninitiated  :)

-lu-w4lt-

- Original Message Follows -
From: "Bob McGraw - K4TAX" 
To: , <"Elecraft List

Subject: Re: [Elecraft] W2IHY 8 band equalizer and EQ Plus
Date: Tue, 27 Apr 2010 20:40:25 -0500

>One of the things we often fail to implement is the
>transmit bandwidth being  adjusted much like the receiving
>bandwidth on the other end.  In a contest  situation likely
>the receiving station is using a 1500 to 1800 Hz receiver 
>bandwidth with likely band pass tuning such that the lower
>300 to 500 Hz of  that is attenuated.  This makes for an
>effective receive bandwidth of some  1300 Hz or so.
>
>Now then with our transmitter setting for a "full width"
>normal SSB  bandwidth of say 2.6 or 2.8 KHz and a low end
>roll off of say 120 Hz this  make for an effective
>bandwidth of some 2600 Hz.  Yes our transmitter power  is
>spread over that bandwidth.  Wouldn't it make more sense to
>concentrate  the transmitter power over say 1300 Hz rather
>than 2600 Hz?  In doing so one  gains almost 3 dB of
>effective power increase with actually no increase in  PEP.
> Plus the other folks on the band will appreciate the
>narrow signals.
>
>Yes of course it will sound pinched up but in reality there
>is little  information in the male voice spoken range below
>400 Hz and little above  1500 to 1800 Hz.  But hey, some of
>the compressed and processed signals only  serve to occupy
>the full 2600 Hz of bandwidth, with what?  It's not pretty 
>for sure.  So if you want a screaming DX pileup busting
>signal, squeeze in  the bandwidth and don't worry about the
>EQ or the special purpose mike.  Your good sounding SSB
>mike into that transmitter bandwidth will do the job  just
>fine and the neighbors on either side of your frequency
>will appreciate  your efforts.
>
>73
>Bob, K4TAX
>
>



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Re: [Elecraft] K2 full power delay on CW

[Vic, K2VCO]

This is entirely normal and is a result of how the K2's transmit AGC 
loop works.

Get back on the air!

On 4/27/10 7:31 PM, J.A. Wolf, MD, K6JW wrote:
> I recently acquired a used K2 (looks nice next to my K3), but I've
> noticed something that might be of concern with it. When I enter CW
> mode and key down for the first time, there's a short delay (a split
> second) for the power to come up to full output, as indicated on my
> Alpha wattmeter. For instance, if I'm set to full 100 watt output,
> initial key down might start at 92-94 watts and then quickly go to
> full output. After the initial key down, all further sending puts out
> full power instantaneously. If I change modes and then come back to
> CW, the first key down will cause the behavior to repeat. This
> doesn't seem to be a big problem -- I'm getting excellent signal
> reports -- but I'm curious as to whether I should be concerned. Has
> anyone else on the reflector seen this? --Jeff, K6JW
-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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[Elecraft] K3 not turning off

[Glenn VK4FZ]

My K3 (S/N 544) is no longer turning off properlythe 12v sense mod is
done, any ideas for further investigation
Thanks,
Glenn
VK4FZ
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Re: [Elecraft] W2IHY 8 band equalizer and EQ Plus

[Jim Brown]

On Tue, 27 Apr 2010 22:49:14 -0400, Lu Romero wrote:

>While I agree in principle, in practice, there are some high
>frequency sibilance "formants" that need bandwidth up to and
>including 2.8kHz to almost 3kHz to be well understood. 
>There are also some harmonics, especially in male voices,
>that go down below 300-400 Hz. 

YES. Because I've made my living designing sound systems for 
highly reverberant churches, this is something that I've had to 
carefully study. It is VERY well known that the most important 
octave bands for speech intelligibilty are the octave bands 
centered on 1,000 Hz and 2,000 Hz. Those bands range means from 
about 720 Hz to about 2.8 kHz. The 500 Hz is next most important 
(extending down to about 350 Hz), followed by the 4000 Hz octave 
band. Human knowledge about this is VERY well established, and 
dates back to the earliest days of telephony. That's why it's so 
important to boost the mic response to compensate for the rolloff 
by crystal filters between 2 and 3kHz!   

73,

Jim Brown K9YC


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Re: [Elecraft] QSK THUMPS?

[Gary, W7TEA]

Eric, a few things you might try:

Check whether you have NEW chosen in CW WGHT menu (p 54)

Reduce RF gain

Determine if the thumping changes if you decrease power and/or bypass the
linear amp.

Determine if it occurs when you operating SPLIT

You might share your menu settings with the group.  Someone sharper than I
am may see the culprit.

73, Gary W7TEA





-
73,

Gary W7TEA  K3 #1001
-- 
View this message in context: 
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[Elecraft] OT: Custom case for AADE L/C Meter

[Mike F.]

I apologize for the off-topic post, but thought some might be interested. I've 
mostly been a lurker here, as I still have more to learn than I'm able to offer 
to others. 

Several months ago I bought an AADE L/C Meter IIB. I love the thing, but since 
my "bench" is an open table, it seemed to be a bit unprotected, or at least a 
dust magnet. So I contacted Rose, N7HKW (elecraftcov...@rfwave.net), maker of 
the nicest custom cases I've ever seen, and asked if she would consider making 
a case for my L/C meter. A few e-mails back and forth with ideas and 
measurements ensued, and several weeks later a prototype landed on my doorstep. 
The case exceeded my expectations in every way; she really nailed the design on 
the first try. It's padded, fleece lined, embroidered, has two pockets for 
leads, reference sheets, etc., and closes with an ample flap with hook & loop 
closure. 

I was not asked to post this, and I stand to gain nothing by doing so. I just 
wanted to pass along something that others might be interested in. I asked Rose 
and her husband, Ken, K0PP for permission to make people aware of this, and for 
permission to supply photos if anyone requests them, which I'll gladly do. They 
tell me the cost of these cases will be somewhere around $30US. 

73, 
Mike, KCØKBC 
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[Elecraft] K2 power delay on CW

[J.A. Wolf, MD, K6JW]

Just want to say thanks to those who responded so quickly to my question about 
the ramp-up delay in output with my K2. I appreciate the info and am glad to 
know it's normal.
73,
Jeff, K6JW
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Re: [Elecraft] DC-supply for a preamp?

[Edward Cole]

Martin,

I installed an ARR P50VDG preamp on the back side of my K3/10 using 
preamp in/out connectors on the KVX3.
photo: http://www.kl7uw.com/K3-ARR-6mPreamp.jpg

I will control the power via the ACC jack when I get a VGA jack.  For 
now it is on when the K3 is on.
Much easier and safer than using a bias tee  and remote switched 
preamp.  I agree with Lance that you will not likely see any 
improvement in sensitivity mounting the preamp at the antenna.  For 
keeping loss down use LMR-400 coax for runs up to 100-feet, and 
LDF4-50A Heliax for longer runs.  This keeps transmission losses down, too.

73, Ed - KL7UW
I run 80-feet of LMR-400 to my 3-element 6m yagi at 55-feet on the tower.
http://www.kl7uw.com/6m.htm

--

Message: 2
Date: Tue, 27 Apr 2010 16:25:52 +
From: Lance Collister 
Subject: Re: [Elecraft] DC-supply for a preamp?
To: DM4iM , Reflector Elecraft
 
Message-ID: 
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

On 4/27/2010 2:32 PM, DM4iM wrote:
 > Elecrafters,
 > this might be a rig-killer and vy stupid, but
 >
 > Can i power a 6m masthead-preamp by feeding dc via choke and coupling
 > C's to the KXV3A's in/out sockets (where the elecraft preamp is supposed
 > to sit), or is this a big NONO?
 >
 > Martin
 >
Hello Martin,

I think you could do better by simply installing the PR6 at the K3 
and using low
loss coax to the antenna.  Almost all the 6m EME stations around the 
world use a
good external preamp in the shack.  If your coax cable loss is 1 dB 
or less, you
will not gain anything by mounting the 6m preamp at the antenna.

You can model this for yourself in the EME CALCULATOR (accessed from 
the EME ECHO
MODE screen in the old WSJT Version 4). Because the EME CALCULATOR 
and EME ECHO
MODE were never re-written in the language used in more recent 
revisions of WSTJ,
that old version is still available:

http://www.physics.princeton.edu/pulsar/K1JT/WSJT498.EXE

I think you will find it much simpler to keep the preamp in the 
shack!  GL and VY
73, Lance

-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, 
ZF2OC/ZF8, E51SIX)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
LIVE MESSENGER CHAT: w...@hotmail.com
2m DXCC #11, 6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the Magic Band EME email!
http://6meme.com/mailman/listinfo/magic_6meme.com


73, Ed - KL7UW, WD2XSH/45
==
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 144-600w, 432-100w, 1296-60w, 3400-fall 2010
DUBUS Magazine USA Rep dubus...@hotmail.com
== 

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Re: [Elecraft] W2IHY 8 band equalizer and EQ Plus

[Joe Subich, W4TV]

 > It is VERY well known that the most important octave bands for
 > speech intelligibilty are the octave bands centered on 1,000 Hz
 > and 2,000 Hz. Those bands range means from about 720 Hz to about
 > 2.8 kHz. The 500 Hz is next most important (extending down to
 > about 350 Hz), followed by the 4000 Hz octave band.

And in the 1000 Hz band, the important part is almost entirely
the upper third.  Human voice has almost no energy and nothing
that contributes to intelligibility between approximately 700
and 1100 Hz (with some variation in the beginning/end of that
dead band).  One can do extremely effective communications audio
with 300 - 600 Hz and 1200 Hz to 2400 Hz only.  Extend that just
slightly (200 - 600 Hz and 1200 Hz - 2800 Hz) and one gets audio
with very good "presence" (the low format) and excellent
articulation (the high format).

It is also interesting that human hearing is most sensitive in
the very area that the human voice has no energy.  Some have
speculated that to be an evolutionary "defense" which allowed
early man to hear danger in the middle of a crowd of voices.

73,

... Joe, W4TV

On 4/28/2010 12:29 AM, Jim Brown wrote:
> On Tue, 27 Apr 2010 22:49:14 -0400, Lu Romero wrote:
>
>> While I agree in principle, in practice, there are some high
>> frequency sibilance "formants" that need bandwidth up to and
>> including 2.8kHz to almost 3kHz to be well understood.
>> There are also some harmonics, especially in male voices,
>> that go down below 300-400 Hz.
>
> YES. Because I've made my living designing sound systems for
> highly reverberant churches, this is something that I've had to
> carefully study. It is VERY well known that the most important
> octave bands for speech intelligibilty are the octave bands
> centered on 1,000 Hz and 2,000 Hz. Those bands range means from
> about 720 Hz to about 2.8 kHz. The 500 Hz is next most important
> (extending down to about 350 Hz), followed by the 4000 Hz octave
> band. Human knowledge about this is VERY well established, and
> dates back to the earliest days of telephony. That's why it's so
> important to boost the mic response to compensate for the rolloff
> by crystal filters between 2 and 3kHz!
>
> 73,
>
> Jim Brown K9YC
>

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