[Elecraft] Feature request/question?

[w8zn54]

 
 I need to use 24 MHz as an I.F. frequency for a transverter. In the XV config, 
the only I.F. choices are 21, 28 and 50. Any chance 24 could be added? I could 
use high power 24 MHz with an attenuator but I need to operate at 24.! Mhz 
which gives an out of band message.

HNY to all the good folks at Elecraft!!
 
Terry Price
W8ZN - ex K8ISK/WD8ISK
1.8 MHZ - 47 GHz - FM18dv
Member of the K8GP Contest Group
FM19bb
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Re: [Elecraft] KPA1500 not the whole answer

[Vic Rosenthal]

I have the opposite - minimum space for antennas. I have a short (10 m long) 
rotary dipole and a Pixel Loop RX antenna about 10m away from it. The loop is 
vertically polarized and diversity really helps, even on 40 meters where the 
separation is only about 1/4 wavelength.
Signals have a 'solid' sound that makes them stand out from the noise. One of 
my favorite K3 features!

Vic 4X6GP

> On 1 Jan 2017, at 05:37, lmarion  wrote:
> 
>   Full K3s  KPA500  K line setup here.
> 
> I have  10 acres with 5 acres of it in antenna farm.  
> 
> My K3s with subreceiver, used almost exclusively in diversity receive mode, 
> which  works so
> great,  that I think if everybody  was using one, 1500 watt amps would be a 
> waste of resources.
> 
> I knew that diversity receive was the way to go.  All of the FAA search radar 
> systems I worked on
> before I retired, use two receive channel diversity standard. When you are 
> detecting the reflected signal
> off the target at 250 miles,  diversity receive is the difference between not 
> seen and full detection.
> 
> Not every one is fortunate as I to have room for superior antennas.
> 
> But every one has room for diversity receive with the K3s.
> 
> 73  Leroy AB7CE
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Re: [Elecraft] I need More RX Volume on my K3, has anyone run an external audio amp?

[Vic Rosenthal]

There's an AUD GAIN parameter in the CONFIG menu. If it is not already set to 
HI then try that first.

Vic 4X6GP

> On 1 Jan 2017, at 00:46, Harry Yingst via Elecraft  
> wrote:
> 
> 
> I have the K3 and a pair of SP3 speakers
> 
> When I turn down the RF gain and turn on the NR (to clean up the band noise)  
> I run out of Audio (too quiet) to hear the weaker signals.
> 
> I was curious if anyone is running a small external amp between the K3 and 
> the speakers to help bring up the volume?
> 
> Thank you
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[Elecraft] All the Amplifier Discussions

[Terry]

As I have been reading the various threads on Amplifiers over the past few
days, I am struck by the incredible variety of topics and activities that
bring all of us joy in Amateur Radio.  For some of us, it is the ability to
make contacts with very little power.  For others, just running a standard
100 watts and trying to earn DXCC etc. or other awards, is a great
challenge.  

For others, getting every bit of legal power output as possible, or
discussing what 1-3 dbs. means in making that contact is very important
whereas, someone else might say, "Who cares?"  We all get enjoyment from the
hobby in so many ways.

The maximum power I have ever used was 100 watts.  With a good yagi, there
was never a station if I heard it, I could not work it.  I might have not
been able to bury everyone with a kilowatt signal and be heard first, but it
is really an amazing thing to be in the fray with the big boys and through
timing of the call and other tricks learned over the years, get someone to
come back to me.

I was exclusively an SSB operator for 24 years, then took 9 years off from
the hobby then came back as a CW operator.  It was quite a challenge to get
my speed back after so many years of viewing CW as a means to get up to
Extra, instead of a mode of conversation that I could really enjoy. 

After all these years, What I have discovered is not whether I can squeeze
out all the power possible, or have the greatest antennas, or all the
greatest rigs, (Although my K2, KX3, PX3, and KXPA100 are absolutely the
best rigs I have ever ownedthanks Elecraft!) or spent time on this group
arguing the minute details of some technical question, even though many get
a great deal of enjoyment doing that.

What I have discovered is it is the relationships we make on the air with
our fellow hams.  It is that human connection across the miles, whether it
be several miles on 160, or around the world on 10, it is the great memories
of all the interesting hams I have met on the air, both on SSB, Digital, or
CW that really make Amateur Radio special.

We are all very fortunate to have such a great hobby to enjoy...and to
always remember it is a hobby, and that family always comes first, yet have
great experiences along the way.  

When I became a ham at 34 years old, I thought about how ham radio would be
with me throughout my life and as I got older and had more time, it would be
wonderful to have the hobby. Now that I am 68 years old, I still don't seem
to have enough time, but ham radio is a wonderful hobby to enjoy.  One of my
realizations is that even though I have enjoyed several sunspot cycle
maximums over the years,  if I am lucky, I will get to enjoy only one more
in my lifetime.  Life passes so quickly.  Enjoying every day in the
wonderful hobby is such a blessing, and I know that many of us share those
thoughts.

Very 73's,

Terry, N7TB






--
View this message in context: 
http://elecraft.365791.n2.nabble.com/All-the-Amplifier-Discussions-tp7625301.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] Amplifiers in general

[Jim Brown]

On Sat,12/31/2016 6:29 PM, Bill Frantz wrote:
We concluded that the very low harmonic and IMD distortions of the 
sound system made it easier to decode the (undistorted) acoustic speech.


That system was highly respected by auidio pros at the time. The primary 
reason it was so clean was that each instrument was feeding its own 
vertical line array. Loudspeaker arrays like that produce a narrow beam 
in the vertical plane, but are wide in the horizontal plane. It's like 
stacking antennas. That narrow beam greatly reduces reverberation, which 
is what made the sound easy to understand. Another advantage of that 
system was that if you were reasonably close, you could localize each 
instrument aurally as well as visually. That also makes the sound 
cleaner. And yes, the distortion was probably lower, but the other two 
reasons I noted are probably the most important.


73, Jim K9YC

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[Elecraft] Elecraft CW Net Announcement

[kev...@coho.net]

Happy New Year,

Winter keeps moving the sun northward.  A solar breeze is 
replenishing the ionosphere and making quite a racket.  Hopefully the 
signals can overpower the noise.  Any change in propagation will only be 
better.


After a few days of thaw the chill came back along with more 
precipitation.  Hoarfrost built up over a few hours and then fluffy snow 
began.  Cold days make the wood split more easily. Today's wood came 
inside four days ago allowing me to maintain the symbiotic relationship 
with my wood stove.  She likes dry wood much better.


Please join us tomorrow on:

   14050 kHz at 2300z Sunday (3 PM PST Sunday)
 7045 kHz at 0200z Monday (6 PM PST Sunday)

73,
Kevin. KD5ONS

-

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Re: [Elecraft] K3 and Ten Tec Titain 465 hook up

[Jim Brown]

I've been using Titans with my K3s for years. Works great. The Titan is 
a nice amp.


All it needs is an RCA-RCA cable from the K3 amp key out to the PTT in 
of the Titan. QSK works fine, but if you work a LOT of CW, it's possible 
to wear out the main T/R relay. No problem, they're easy to find, 
reasonably priced, and not difficult to change. I've done it a couple of 
times in ten years. It's a vacuum relay, mounted on a small board right 
behind the output coax connector. The stock relay is a Kilovac or 
Jennings; most of us use exact replacements by Gigavac. They have a 
special discount for hams.


Schematics are on my website. Scroll down.  k9yc.com/publish.htm

73, Jim K9YC

On Sat,12/31/2016 5:04 PM, John McBee wrote:
I have just purchased an Ten Tec Titan 425 amplifier and was wondering 
the best way to hook it to my K3?  I would like to be able to use QSK 
with the amp too.  Just don't want to mess anything up, so thought I 
would ask here first.


Thanks in advanced for any suggestions..


73'

John

KM5PS

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Re: [Elecraft] Please do a KPA1500

[Jim Brown]

Audio processing can create distortion only in the passband of the 
crystal filters. It may sound varying degrees of awful, but it doesn't 
cause splatter. You've got to overdrive an RF stage or have that stage 
drive a mismatched load, or drive it with AGC engaged, or stuff like 
that to generate splatter.


73, Jim K9YC

On Sat,12/31/2016 4:04 PM, Ignacy wrote:

The IMD as measured are misleading. Take FT1000 or FT5000. Measured IMD in
class A perhaps -50db but real one with processing due to aggressive ALC of
perhaps -25 db.



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[Elecraft] Feature request/question?

[w8zn54]

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[Elecraft] KPA1500 not the whole answer

[lmarion]

   Full K3s  KPA500  K line setup here.

I have  10 acres with 5 acres of it in antenna farm.  

My K3s with subreceiver, used almost exclusively in diversity receive mode, 
which  works so
great,  that I think if everybody  was using one, 1500 watt amps would be a 
waste of resources.

I knew that diversity receive was the way to go.  All of the FAA search radar 
systems I worked on
before I retired, use two receive channel diversity standard. When you are 
detecting the reflected signal
off the target at 250 miles,  diversity receive is the difference between not 
seen and full detection.

Not every one is fortunate as I to have room for superior antennas.

But every one has room for diversity receive with the K3s.

73  Leroy AB7CE



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Re: [Elecraft] K3 and Ten Tec Titain 465 hook up

[John McBee]

On 12/31/2016 7:04 PM, John McBee wrote:
I have just purchased an Ten Tec Titan 425 amplifier and was wondering 
the best way to hook it to my K3?  I would like to be able to use QSK 
with the amp too.  Just don't want to mess anything up, so thought I 
would ask here first.


Thanks in advanced for any suggestions..


73'

John

KM5PS

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I have it working using non-qsk, using key out of k3 to key in on titan 
amp.  My question still is how to hook up for qsk operation with k3?



Tnx

John

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Re: [Elecraft] Amplifiers in general

[Bill Johnson]

Bill, I also experienced a very quality system at a friend's house ~ 1976
and it was amazing.  A wall of speakers and beautiful volume, concert level
and able to talk.  Reminds me of my Dynaco A60 speakers and amp.  This was
the best audio at the time and I starved to save $'s to purchase this audio
equipment, while stationed in Germany, from the PX.  In the Signal Corp  we
were trained techs in audio for the passing of traffic to and fro from Korat
AFB to Viet Nam and other linked stations.  We learned a ton about audio and
equalization and worked diligently to stay within parameters in our
multiplexed signals with the best audio equipment for the military and
probably anywhere. ( My experience is frozen in memory so I understand what
you are writing about. )  A truly fantastic experience.  Yes, I can still
hear with damage done from shooting ranges, concussion grenades and 105 dB
alarms at the site when parameters failed.  Other than that, life now is
good.

73,
Bill
K9YEQ

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bill
Frantz
Sent: Saturday, December 31, 2016 8:30 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifiers in general

A group of about 5 of my friends and I noticed this effect at a early 1970s
Grateful Dead concert at the San Francisco Cow Palace. They were testing a
new sound system which came to be called "The Wall of Sound". While the
music was definitely loud, very loud, we could have a normal conversation
with each other, something we had never been able to do at other concerts.
We concluded that the very low harmonic and IMD distortions of the sound
system made it easier to decode the (undistorted) acoustic speech.

This experience makes me very interested in the level of audio distortion in
amateur radio audio chains. The 10% quoted for HTs is much too much for
optimum copy. Copy is better if the audio chains are hifi quality for
distortion.

73 Bill AE6JV

On 12/31/16 at 11:51 AM, caut...@montac.com (Clay Autery) wrote:

>I submit that all "noise" is not equal.  I'm guessing that you can hear 
>a radio transmission mathematically below the apparent  noise level 
>because it is "atypical" or "organized noise" as opposed to the "noise"
>in the S2 noise floor which is "disorganized".
-
Bill Frantz| Re: Hardware Management Modes: | Periwinkle
(408)356-8506  | If there's a mode, there's a   | 16345 
Englewood Ave
www.pwpconsult.com | failure mode. - Jerry Leichter | Los Gatos, CA 95032

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[Elecraft] K3s low power at first

[lmarion]

All equipment factory  built/aligned  K3s to KPA500 using KAT500.  
Had the setup about 6 months now.
When first tuned up on any band SSB or CW mode, with 5 watts K3 drive,
  it takes a short transmission at 15 watts K3 drive for the amp to ramp up to 
500 watts as read on the KPA500.
It stays at that level until a frequency or band change occurs. 
A short transmission and it ramps up to full output power again. 
  A  CW  ID  is usually sufficient to ramp the power up to 500 watts.

Is there a tweak that needs to be done, or should I leave well enough alone?

  Leroy AB7CE

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Re: [Elecraft] Amplifiers in general

[Bill Frantz]

A group of about 5 of my friends and I noticed this effect at a 
early 1970s Grateful Dead concert at the San Francisco Cow 
Palace. They were testing a new sound system which came to be 
called "The Wall of Sound". While the music was definitely loud, 
very loud, we could have a normal conversation with each other, 
something we had never been able to do at other concerts. We 
concluded that the very low harmonic and IMD distortions of the 
sound system made it easier to decode the (undistorted) acoustic speech.


This experience makes me very interested in the level of audio 
distortion in amateur radio audio chains. The 10% quoted for HTs 
is much too much for optimum copy. Copy is better if the audio 
chains are hifi quality for distortion.


73 Bill AE6JV

On 12/31/16 at 11:51 AM, caut...@montac.com (Clay Autery) wrote:


I submit that all "noise" is not equal.  I'm guessing that you can hear
a radio transmission mathematically below the apparent  noise level
because it is "atypical" or "organized noise" as opposed to the "noise"
in the S2 noise floor which is "disorganized".

-
Bill Frantz| Re: Hardware Management Modes: | Periwinkle
(408)356-8506  | If there's a mode, there's a   | 16345 
Englewood Ave
www.pwpconsult.com | failure mode. - Jerry Leichter | Los Gatos, 
CA 95032


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Re: [Elecraft] I need More RX Volume on my K3, has anyone run an external audio amp?

[Harry Yingst via Elecraft]

Thank You

The specs say that the SP3's are rated at 15 watts so I should be able to find 
a small stereo amp


  From: Mel Farrer 
 To: Harry Yingst ; Elecraft Reflector 
 
 Sent: Saturday, December 31, 2016 6:10 PM
 Subject: Re: [Elecraft] I need More RX Volume on my K3, has anyone run an 
external audio amp?
   
Yes, I have an old SS 15 watt HIFI amp I use to feed a small HIFI speaker under 
the desk.  Works great and I can fill the room with CLEAN audio.
Mel, K6KBE


  From: Harry Yingst via Elecraft 
 To: Elecraft Reflector  
 Sent: Saturday, December 31, 2016 2:46 PM
 Subject: [Elecraft] I need More RX Volume on my K3, has anyone run an external 
audio amp?
  

I have the K3 and a pair of SP3 speakers

When I turn down the RF gain and turn on the NR (to clean up the band noise)  I 
run out of Audio (too quiet) to hear the weaker signals.

I was curious if anyone is running a small external amp between the K3 and the 
speakers to help bring up the volume?

Thank you
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Re: [Elecraft] ERR TXGN

[Don Wilhelm]

Jim,

You do need a good 50 ohm dummy load to run the TX Gain Calibration.
If it fails with K3 Utility, you can try running it band by band as 
indicated in the manual.  After having success with the manual 
calibration, try running it from K3 Utility again.


If you do not have a good 50 ohm dummy load that is good through 6 
meters, the TX Gain Calibration will fail due to "high SWR".


If your dummy load is not "up to par" borrow one from a local ham.

73,
Don W3FPR

On 12/31/2016 7:25 PM, James Holohan wrote:

Completed building my K3S (2.7kHz stock filter only, KP3A 100 W PA). Carried out 5 W and 
50 W calibration successfully. Subsequently upgraded Software successfully. Shut down but 
next day noticed power out was low. Re-run Calibration but now it fails even on 5 W 
showing "ERR TXGN". I'd appreciate any help.


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[Elecraft] K3 and Ten Tec Titain 465 hook up

[John McBee]

I have just purchased an Ten Tec Titan 425 amplifier and was wondering 
the best way to hook it to my K3?  I would like to be able to use QSK 
with the amp too.  Just don't want to mess anything up, so thought I 
would ask here first.


Thanks in advanced for any suggestions..


73'

John

KM5PS

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Re: [Elecraft] k3 problem

[Don Wilhelm]

Bob,

He will have to wait until Tuesday - Elecraft is closed Monday.
In the meantime, he should look at what is enabled for his transmit 
filters using K3 Utility.  He needs to know what filters are installed.
There should be a sticker on the inside of the top cover indicating 
which filters are installed.


73,
Don W3FPR

On 12/31/2016 7:13 PM, Bob Gibson via Elecraft wrote:

Well I guess he will have to call on Monday to Elecraft to get help.. over the 
phone will just not work.. Thanks to all who replied!!73s Bob W5RG
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Re: [Elecraft] KX1 Questionj

[Don Wilhelm]

Ron,

That indicates Upper Sideband.  It will rotate between L, U and NOR.
To change it hold the outside two blue buttons.  When in NOR (CW) mode, 
there is no designator displayed. See page 66 in the manual.


73,
Don W3FPR

On 12/31/2016 7:04 PM, Ron Reis wrote:

Just got my KX1 together and checking the receiver.  I noticed that when
selecting 7mhz i see a "U" on the leading character of the LED.  Do not see
this on 14mhz.  Can't find any reference to this in the manual.  Can anyone
tell me if this is normal?

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[Elecraft] ERR TXGN

[James Holohan]

Completed building my K3S (2.7kHz stock filter only, KP3A 100 W PA). Carried 
out 5 W and 50 W calibration successfully. Subsequently upgraded Software 
successfully. Shut down but next day noticed power out was low. Re-run 
Calibration but now it fails even on 5 W showing "ERR TXGN". I'd appreciate any 
help.

Regards.

Jim EI4HH.
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[Elecraft] k3 problem

[Bob Gibson via Elecraft]

Well I guess he will have to call on Monday to Elecraft to get help.. over the 
phone will just not work.. Thanks to all who replied!!    73s Bob W5RG
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[Elecraft] New Years 2017

[Willie - N5EIT]

If anyone is in Louisiana around 2359 31 December 2016, my friends and I
will have cocaine and hookers at the El Dorado casino in shreveport 
he he heI'm just kidding ...  I'll be on 30M cw through the night at my
deer lease... looking for dx!!!

-- 

*Sincerely,*

*William B. Taylor*
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Re: [Elecraft] Please do a KPA1500

[Ignacy]

The Expert 1.3k is sold with the 15 db restriction. But anybody can do a low
power mod and it is legal.

ARLL Review (July 16) shows IMD at 1.3 KW level:
  3rd/5th/7th/9th (14 MHz, 1300 W PEP): –31/–39/–57/–55 dB.

Seems not to be worse than Acom 1500.

The IMD as measured are misleading. Take FT1000 or FT5000. Measured IMD in
class A perhaps -50db but real one with processing due to aggressive ALC of
perhaps -25 db.

Good feature of the expert is automatic 110/220V supply. If 220V is
unavailable or sags, switch to lower power. 

Ignacy, NO9E




--
View this message in context: 
http://elecraft.365791.n2.nabble.com/Please-do-a-KPA1500-tp7625198p7625281.html
Sent from the Elecraft mailing list archive at Nabble.com.
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[Elecraft] KX1 Questionj

[Ron Reis]

Just got my KX1 together and checking the receiver.  I noticed that when
selecting 7mhz i see a "U" on the leading character of the LED.  Do not see
this on 14mhz.  Can't find any reference to this in the manual.  Can anyone
tell me if this is normal?
73
Ron
KB6K
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Re: [Elecraft] I need More RX Volume on my K3, has anyone run an external audio amp?

[Mel Farrer via Elecraft]

Yes, I have an old SS 15 watt HIFI amp I use to feed a small HIFI speaker under 
the desk.  Works great and I can fill the room with CLEAN audio.
Mel, K6KBE


  From: Harry Yingst via Elecraft 
 To: Elecraft Reflector  
 Sent: Saturday, December 31, 2016 2:46 PM
 Subject: [Elecraft] I need More RX Volume on my K3, has anyone run an external 
audio amp?
   

I have the K3 and a pair of SP3 speakers

When I turn down the RF gain and turn on the NR (to clean up the band noise)  I 
run out of Audio (too quiet) to hear the weaker signals.

I was curious if anyone is running a small external amp between the K3 and the 
speakers to help bring up the volume?

Thank you
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Re: [Elecraft] k3 problem

[Don Wilhelm]

Bob,

The list of error codes start on page 68 of the
K3 manual.
ERR EFX does not exist, but ERR TXF is valid - it says the filter 
configured for transmit is not valid.
That is relatively easy to see with K3 Utility - Configuration tab, 
Configure Xtal Filters.

The filter for CW, DATA, SSB must be the 2.7 or 2.8 kHz filter.
For ESSB it needs to be the 6Khz filter and AM can use either the 6kHz 
or 13kHz filter

And for FM it must be the 13kHz filter.

Is there any chance he has turned on ESSB mode in the menu and does not 
have the 6kHz filter installed?


73,
Don W3FPR

On 12/31/2016 5:40 PM, Bob Gibson via Elecraft wrote:

Hi Fellows.. I have a friend that I'm trying to help.. he is 85 years old and 
has a k3. He turned on the radio today and got a err exf message... or he may 
have said err txf. not sure.. I told him I would try to help him.. he is in 
OKLA and I'm in Florida so it is not easy.. Can someone please tell me what the 
message means.. and I will call him back. He is a very dear ham buddy of 60 
years. Thanks73s Bob W5RG

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Re: [Elecraft] k3 problem

[Harry Yingst via Elecraft]

As per the K3 Manual Rev D10, Page 70

ERR TXF Invalid transmit crystal filter bandwidth

The crystal filter selected for TX (with CONFIG:FLTX) is either too narrow or 
too wide.
You must specify a filter that is 2.7 or 2.8 kHz wide for CW/DATA/SSB, 6 kHz 
for AM, and 13.0 kHz for FM).


That being said it could be a mis-configuration, or possible Corrupt firmware 
in the radio (Speculation from reading past messages)





  From: Bob Gibson via Elecraft 
 To: "elecraft@mailman.qth.net"  
 Sent: Saturday, December 31, 2016 5:40 PM
 Subject: [Elecraft] k3 problem
   
Hi Fellows.. I have a friend that I'm trying to help.. he is 85 years old and 
has a k3. He turned on the radio today and got a err exf message... or he may 
have said err txf. not sure.. I told him I would try to help him.. he is in 
OKLA and I'm in Florida so it is not easy.. Can someone please tell me what the 
message means.. and I will call him back. He is a very dear ham buddy of 60 
years. Thanks    73s Bob W5RG
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Re: [Elecraft] I need More RX Volume on my K3, has anyone run an external audio amp?

[Roger D Johnson]

I use an amplified pair of computer speakers.

73, Roger


On 12/31/2016 5:46 PM, Harry Yingst via Elecraft wrote:

I have the K3 and a pair of SP3 speakers

When I turn down the RF gain and turn on the NR (to clean up the band noise)  I 
run out of Audio (too quiet) to hear the weaker signals.

I was curious if anyone is running a small external amp between the K3 and the 
speakers to help bring up the volume?

Thank you
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[Elecraft] I need More RX Volume on my K3, has anyone run an external audio amp?

[Harry Yingst via Elecraft]

I have the K3 and a pair of SP3 speakers

When I turn down the RF gain and turn on the NR (to clean up the band noise)  I 
run out of Audio (too quiet) to hear the weaker signals.

I was curious if anyone is running a small external amp between the K3 and the 
speakers to help bring up the volume?

Thank you
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[Elecraft] k3 problem

[Bob Gibson via Elecraft]

Hi Fellows.. I have a friend that I'm trying to help.. he is 85 years old and 
has a k3. He turned on the radio today and got a err exf message... or he may 
have said err txf. not sure.. I told him I would try to help him.. he is in 
OKLA and I'm in Florida so it is not easy.. Can someone please tell me what the 
message means.. and I will call him back. He is a very dear ham buddy of 60 
years. Thanks    73s Bob W5RG
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Re: [Elecraft] Amplifiers in general

[Wes Stewart]

That's what I was thinking.

On 12/31/2016 11:43 AM, Charlie T, K3ICH wrote:

Using your same logic, why run more than a couple watts output?



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Re: [Elecraft] Please do a KPA1500

[Chris Tate - N6WM]

In fact..  a nice Elecraft Combiner added to the k-line  then why  buy one 
when you can have 2   such a great idea :-).  Everyones happy.

HNY

Chris
N6WM

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ken K6MR
Sent: Saturday, December 31, 2016 12:57 PM
To: Scott Manthe ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Please do a KPA1500

So buy another KPA500 and combine them. Easy peasy.



Ken K6MR







From: Scott Manthe
Sent: Saturday, December 31, 2016 12:22 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Please do a KPA1500



I think a KPA1000 would be pretty popular if priced appropriately. I love my 
KPA500, but a little extra oomph would be nice now and then.

73,
Scott N9AA


On 12/31/16 10:39 AM, j...@kk9a.com wrote:
> Since I sometimes bring my station to the Caribbean, one of the main 
> reasons that I switched to the Elecraft line was for the size and 
> weight. I have a
> KPA500 and an it is an awesome amplifier but I would like a little 
> more power at times. I considered the Expert 1.3k that many with 
> similar needs use but I have not swapped my Elecraft due to the 
> reasons that W4TV mentioned below. It may not be practical for 
> Elecraft to manufacture a small lightweight KPA1500 at an affordable 
> price however perhaps a KPA750 or
> KPA1000 could be. I would certainly be interested in one of these. I 
> read many posts on this list saying that 3 or 4dBs make almost no 
> difference. I did a quick search of my last 200,000+ QSOs and could 
> not find any of the stations making this claim in my logs so I wonder how 
> active they are on HF.
>
> John KK9A
>
>
> From: Joe Subich W4TV
>
> The Expert 1.3K also violates the 15 dB gain limitation rule and is a 
> real garbage generator.  Expert's own test data in their application 
> for FCC approval showed IMD at -27 dB at 800 W!  For your 1 KW, each 
> of the IMD products are probably around .5W and I'd hate to even think 
> about the IMD level at 1.3 KW!
>
> 73,
>
>  ... Joe, W4TV
>
>
>

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Re: [Elecraft] Amplifiers in general

[Fred Jensen]

I believe you're correct Clay.  I think our ears/brain can integrate the 
overall signal, and the noise, if more or less random, will recede into 
the background.  The desired CW signal will then stand out.  I suspect 
that, were you to key noise similar to the background noise and that 
filled the receive BW, it would disappear for a listener as soon as it's 
mean amplitude fell to the background level.


This may also explain why, the more you talk, the less your teenager hears.

73,

Fred K6DGW
- Sparks NV DM09dn

- Northern California Contest Club
- CU in the Cal QSO Party 7-8 Oct 2017
- www.cqp.org

On 12/31/2016 11:51 AM, Clay Autery wrote:

Let me posit a SWAG on why this case APPEARS to buck the math in reality

I submit that all "noise" is not equal.  I'm guessing that you can hear
a radio transmission mathematically below the apparent  noise level
because it is "atypical" or "organized noise" as opposed to the "noise"
in the S2 noise floor which is "disorganized".

Obviously, there are much more correct and scientific ways of
illustrating this, but it would be a LOT longer winded.  :)

73,

PS - Just my intuitive SWAG, btw.


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Re: [Elecraft] Please do a KPA1500

[Ken K6MR]

So buy another KPA500 and combine them. Easy peasy.



Ken K6MR







From: Scott Manthe
Sent: Saturday, December 31, 2016 12:22 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Please do a KPA1500



I think a KPA1000 would be pretty popular if priced appropriately. I
love my KPA500, but a little extra oomph would be nice now and then.

73,
Scott N9AA


On 12/31/16 10:39 AM, j...@kk9a.com wrote:
> Since I sometimes bring my station to the Caribbean, one of the main reasons
> that I switched to the Elecraft line was for the size and weight. I have a
> KPA500 and an it is an awesome amplifier but I would like a little more
> power at times. I considered the Expert 1.3k that many with similar needs
> use but I have not swapped my Elecraft due to the reasons that W4TV
> mentioned below. It may not be practical for Elecraft to manufacture a small
> lightweight KPA1500 at an affordable price however perhaps a KPA750 or
> KPA1000 could be. I would certainly be interested in one of these. I read
> many posts on this list saying that 3 or 4dBs make almost no difference. I
> did a quick search of my last 200,000+ QSOs and could not find any of the
> stations making this claim in my logs so I wonder how active they are on HF.
>
> John KK9A
>
>
> From: Joe Subich W4TV
>
> The Expert 1.3K also violates the 15 dB gain limitation rule and is a
> real garbage generator.  Expert's own test data in their application
> for FCC approval showed IMD at -27 dB at 800 W!  For your 1 KW, each
> of the IMD products are probably around .5W and I'd hate to even
> think about the IMD level at 1.3 KW!
>
> 73,
>
>  ... Joe, W4TV
>
>
>

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Re: [Elecraft] Amplifiers in general

[Doug Turnbull]

Fred,
I agree with all you say but still when reading a signal in the noise on
160M believe me a dB can help in recognizing a call sign.   I often think
that operating on TB is some what like operating on VHF/UHF.  It is
certainly a struggle with noise.

 73 Doug EI2CN

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred
Jensen
Sent: 31 December 2016 19:36
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifiers in general

Please let me correct my typo:  100 mW is 30 dB down, not 40.  Correct 
hand, wrong finger.  100 mW should be close to S0, 2 S-units into the noise.

73,

Fred K6DGW
Sparks NV USA
Washoe County DM09dn

On 12/31/2016 11:25 AM, Fred Jensen wrote:
> One can do this with the NCDXF Beacons ... they change in four 10 dB
> steps, 100 W, 10 W, 1 W, and 100 mW.  No sunspots right now, but you
> might be able to hear one or two of them on 14100.  Most interesting
> thing I notice is, while the 100 W signal may be S6 in S2 noise, I can
> still hear the 100 mW signal which should be 40 dB down [~S0].  The math
> is sound and exact, the reality ... not so much.

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Re: [Elecraft] Please do a KPA1500

[Scott Manthe]

I think a KPA1000 would be pretty popular if priced appropriately. I 
love my KPA500, but a little extra oomph would be nice now and then.


73,
Scott N9AA


On 12/31/16 10:39 AM, j...@kk9a.com wrote:

Since I sometimes bring my station to the Caribbean, one of the main reasons
that I switched to the Elecraft line was for the size and weight. I have a
KPA500 and an it is an awesome amplifier but I would like a little more
power at times. I considered the Expert 1.3k that many with similar needs
use but I have not swapped my Elecraft due to the reasons that W4TV
mentioned below. It may not be practical for Elecraft to manufacture a small
lightweight KPA1500 at an affordable price however perhaps a KPA750 or
KPA1000 could be. I would certainly be interested in one of these. I read
many posts on this list saying that 3 or 4dBs make almost no difference. I
did a quick search of my last 200,000+ QSOs and could not find any of the
stations making this claim in my logs so I wonder how active they are on HF.

John KK9A


From: Joe Subich W4TV

The Expert 1.3K also violates the 15 dB gain limitation rule and is a
real garbage generator.  Expert's own test data in their application
for FCC approval showed IMD at -27 dB at 800 W!  For your 1 KW, each
of the IMD products are probably around .5W and I'd hate to even
think about the IMD level at 1.3 KW!

73,

 ... Joe, W4TV





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Re: [Elecraft] Amplifiers in general

[Clay Autery]

Let me posit a SWAG on why this case APPEARS to buck the math in reality

I submit that all "noise" is not equal.  I'm guessing that you can hear
a radio transmission mathematically below the apparent  noise level
because it is "atypical" or "organized noise" as opposed to the "noise"
in the S2 noise floor which is "disorganized".

Obviously, there are much more correct and scientific ways of
illustrating this, but it would be a LOT longer winded.  :)

73,

PS - Just my intuitive SWAG, btw.

__
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 12/31/2016 1:36 PM, Fred Jensen wrote:
> Please let me correct my typo:  100 mW is 30 dB down, not 40.  Correct
> hand, wrong finger.  100 mW should be close to S0, 2 S-units into the
> noise.
>
> 73,
>
> Fred K6DGW
> Sparks NV USA
> Washoe County DM09dn
>
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Re: [Elecraft] Amplifiers in general

[Bill Johnson]

David, Super point.  

73,
Bill
K9YEQ

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
dm...@nexicom.net
Sent: Saturday, December 31, 2016 12:58 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifiers in general


An increase in power of another station is not always well perceived but the
difference is there.  I've heard guys turn amps on and off and 
you really hear no differencethis is   because your AGC is 
compensating.the difference may actually be big  your just not 
hearing it.
Sometime in a QSO  have the other station increase or decrease the 
signal by 3db.   it will not be that noticable.   now turn off AGC and 
 ask the other station do it again  it will be much more evident. than with
AGC on.


With more than one signal present say in a pileup the different will be
noticeable because the weaker signals will seem quiter when a strong signal
comes in. its all relative.


David Moes
VE3SD



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Re: [Elecraft] Amplifiers in general

[Fred Jensen]

Please let me correct my typo:  100 mW is 30 dB down, not 40.  Correct 
hand, wrong finger.  100 mW should be close to S0, 2 S-units into the noise.


73,

Fred K6DGW
Sparks NV USA
Washoe County DM09dn

On 12/31/2016 11:25 AM, Fred Jensen wrote:

One can do this with the NCDXF Beacons ... they change in four 10 dB
steps, 100 W, 10 W, 1 W, and 100 mW.  No sunspots right now, but you
might be able to hear one or two of them on 14100.  Most interesting
thing I notice is, while the 100 W signal may be S6 in S2 noise, I can
still hear the 100 mW signal which should be 40 dB down [~S0].  The math
is sound and exact, the reality ... not so much.


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Re: [Elecraft] Amplifiers in general

[Fred Jensen]

One can do this with the NCDXF Beacons ... they change in four 10 dB 
steps, 100 W, 10 W, 1 W, and 100 mW.  No sunspots right now, but you 
might be able to hear one or two of them on 14100.  Most interesting 
thing I notice is, while the 100 W signal may be S6 in S2 noise, I can 
still hear the 100 mW signal which should be 40 dB down [~S0].  The math 
is sound and exact, the reality ... not so much.


73,

Fred K6DGW
- Sparks NV DM09dn

- Northern California Contest Club
- CU in the Cal QSO Party 7-8 Oct 2017
- www.cqp.org

On 12/31/2016 10:58 AM, dm...@nexicom.net wrote:


Sometime in a QSO  have the other station increase or decrease the
signal by 3db.   it will not be that noticable.   now turn off AGC and
ask the other station do it again  it will be much more evident. than
with AGC on.



With more than one signal present say in a pileup the different will be
noticeable because the weaker signals will seem quiter when a strong
signal comes in. its all relative.



David Moes
VE3SD


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Re: [Elecraft] Amplifiers in general

[dmoes]

An increase in power of another station is not always well perceived 
but the difference is there.  I've heard guys turn amps on and off and 
you really hear no differencethis is   because your AGC is 
compensating.the difference may actually be big  your just not 
hearing it.
Sometime in a QSO  have the other station increase or decrease the 
signal by 3db.   it will not be that noticable.   now turn off AGC and 
ask the other station do it again  it will be much more evident. than 
with AGC on.



With more than one signal present say in a pileup the different will 
be noticeable because the weaker signals will seem quiter when a 
strong signal comes in. its all relative.



David Moes
VE3SD



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Re: [Elecraft] Amplifiers in general

[Doug Turnbull]

Dear OMs,
There are times when I am sure that 1 dB would make a difference on
160M.

   73 Doug EI2CN

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Charlie T, K3ICH
Sent: 31 December 2016 18:44
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifiers in general

Using your same logic, why run more than a couple watts output? 

 It can easily be heard around the world if conditions are right.

Anything more is a waste of power AND money.

73, Charlie k3ICH



-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bill
Sent: Saturday, December 31, 2016 10:01 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Amplifiers in general

I have always been under the impression the doubling of output power will
result in a power gain of 3 db. And, that 3 db gain is the least signal
increase noticeable at the receiving point. KPA500 outputs 500 Watts - 1000
Watts would give an output gain of 3 db (over the KPA500) and 1500 Watts a
little over 4 db gain. That being my understanding - why would I want to
spend a box full of dollars for more power than my
KPA500 provides? Or, is my understanding flawed?

FWIW, I have run all kinds of amps in my nearly 60 years of being the on the
air and have found that Watts are Watts, regardless of how you generate them
(fancy, cheap, junk, or solid gold).

Everyone have a super HAPPY NEW YEAR!!!

Bill W2BLC K-Line (medium power HF)

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Re: [Elecraft] Amplifiers in general

[Charlie T, K3ICH]

Using your same logic, why run more than a couple watts output? 

 It can easily be heard around the world if conditions are right.

Anything more is a waste of power AND money.

73, Charlie k3ICH



-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bill
Sent: Saturday, December 31, 2016 10:01 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Amplifiers in general

I have always been under the impression the doubling of output power will
result in a power gain of 3 db. And, that 3 db gain is the least signal
increase noticeable at the receiving point. KPA500 outputs 500 Watts - 1000
Watts would give an output gain of 3 db (over the KPA500) and 1500 Watts a
little over 4 db gain. That being my understanding - why would I want to
spend a box full of dollars for more power than my
KPA500 provides? Or, is my understanding flawed?

FWIW, I have run all kinds of amps in my nearly 60 years of being the on the
air and have found that Watts are Watts, regardless of how you generate them
(fancy, cheap, junk, or solid gold).

Everyone have a super HAPPY NEW YEAR!!!

Bill W2BLC K-Line (medium power HF)

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Re: [Elecraft] Amplifiers in general

[K9MA]

I'd just like to add that, averaged over a period of time, say a whole 
contest, a small difference in power can have a significant effect.  
While a dB or so might be very hard to detect in one QSO, over a few 
hundred it makes a difference.  On average, you get through a bit more 
often,  more stations come back to your CQ's, and it adds up.


73,

Scott K9MA


--
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] {OT} - Variation on use of a coaxial switch

[Joel Hallas]

Don,

I agree with your 40 dB isolation number, and would expect that to be fairly
conservative, since that would result in a +10 dBm level at the
non-operating receiver. The ARRL Lab tests all product review receivers for
IMD response at up to +10 dBm input and there have never (to my knowledge)
been any failures. 

But this question comes up frequently in many contexts and the stumbling
block is that there are no "max safe rcv levels" published by manufacturers
(only exception I'm aware of is the Collins 75A4, which has a sticker by the
receive antenna terminal "Do not exceed 50 V," which translates to 50 W at
50 ohms, or +47 dBm -- more than most solid state gear can handle, I would
expect!).

So my question is has (or can) Elecraft actually come up with a "max safe
rcv level" spec for their receivers? This would be great, not only for those
wanting to use a multi-radio switch, but also for those setting up Field Day
or other multiradio environments, or especially for those who use a receive
only antenna. 

Two other comments about the original question: 

The switch isolation figure assumes that all shields are solidly connected.
Loose connector backshells, or bad shield solder connections, can result in
signals propagating around the switch that can be higher than the switch
crosstalk. 

Another potential limitation is that the switch crosstalk spec likely
assumes that all ports are terminated in 50 ohms. If the non-operating
receiver is turned off, or is on another band, the input Z can be very
different and result in higher voltage than the spec would predict. 

Regards, Joel Hallas, W1ZR

Message: 10
Date: Fri, 30 Dec 2016 18:44:58 -0500
From: Don Wilhelm 
To: stan levandowski , Elecraft@mailman.qth.net
Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch
Message-ID: <805217a9-a8a2-7b82-ff34-db2765bea...@embarqmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed

Stan,

If your maximum power is 100 watts and the isolation of the switch is 
40dB or more then I don't think you have any problem.

73,
Don W3FPR

On 12/30/2016 5:49 PM, stan levandowski wrote:
> I would like to use a coaxial switch for an unintended use and I'm not
> sure if it's a good idea in terms of RF isolation and potential
> equipment damage.


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Re: [Elecraft] KXPA100 with PX3

[Ray W2RS via Elecraft]

Yes, the power light is on.  When I'm in Basic mode (PA MODE OFF), the KXPA100 
draws 12 amps key down at 13 VDC.  The power output is 100 watts.  With PA MODE 
ON, there is no output and the current drawn is 8 amps at 13 VDC.  The power is 
dissipated through the heat sink.


Hope this helps.


73 Ray W2RS

Does the power light on the KXPA100 turn on when you power on the KX3?





-Original Message-
From: Don Wilhelm 
To: rsoifer1 ; dave 
Cc: fcady ; ai6do ; elecraft 

Sent: Fri, Dec 30, 2016 1:49 pm
Subject: Re: [Elecraft] KXPA100 with PX3

Ray,

Does the power light on the KXPA100 turn on when you power on the KX3?

I am not sure about your statements about "all the power it produces is 
being dissipated"
Dissipated where?  Into power output or into heat?  Does the heatsink 
heat up?

Similarly, your statement about "no power dissipated" when in basic mode.

Can you connect an external wattmeter and a dummy load, put the KXAT100 
into bypass and see what the KXPA100 is really producing. That more 
detailed information will aid in answering your question.  If you can 
measure the current draw and voltage during keydown that would help even 
more.

73,
Don W3FPR

On 12/30/2016 3:16 PM, rsoif...@aol.com wrote:
> Further to my last email, when I am in Basic mode, with PA MODE set to 
> OFF and the KXPA100 on/off switch set to ON, I get full power out and 
> no dissipation.  When PA MODE is ON and the on/off switch set to OFF, 
> the KX3 acts like the KXPA100 is connected to it but there is no power 
> output from the KXPA100 but all the power it produces is being 
> dissipated.  Some setting is probably wrong, but I can't figure out 
> which one.
>
>


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Re: [Elecraft] Amplifiers in general

[Jim Brown]

On Sat,12/31/2016 7:01 AM, Bill wrote:
I have always been under the impression the doubling of output power 
will result in a power gain of 3 db. 


Right.

And, that 3 db gain is the least signal increase noticeable at the 
receiving point.


Wrong.  As an audio professional, I had to learn a lot about human 
perception of sound. Here are some things I've learned, both by studying 
what others have learned and by my own observations.


1) If some sound is all by itself (that's all that you here, no other 
sounds), 1 dB is the smallest change in level that most listeners will 
hear.


2) If some sound is surrounded by other sounds -- a single instrument in 
a band or orchestra, a signal in noise, a 1 dB change can be the 
difference between hearing it and not hearing it. When I mixed live 
sound for 20-40 piece orchestras (Tony Bennett, for example), correcting 
a balance problem usually involved slightly moving the fader for the 
instrument that was too loud or not loud enough. When adjusting voice 
paging levels in an office building, 2-3dB was the difference between 
not quite loud enough to get over the air conditioner noise and being to 
loud. A change in the frequency response of a dB or two can be the 
difference between sounding "right" or not.


3) If a sound is all by itself, it takes a change in level of 6-10 dB to 
be perceived as "twice" (or "half" as loud. But that doesn't apply to a 
transmitter, because we have a volume control on our radio. :)


4) Human voice levels vary widely as we talk. Variations of 20 dB are 
common.


5) Voice frequencies in the range of 500 - 3,000 Hz are most critical 
for speech intelligibility.


In addition to running more power, we can get gain from improving  our 
antenna system. A more efficient counterpoise/radial system for a 
vertical, feedline with lower loss, a more efficient antenna tuner, and 
the biggie, an antenna that better focuses its radiation at the 
elevation, and/or in the direction, that gets to the other station. We 
can use audio compression, and we can equalize our audio to transmit 
only the parts of our voice that provides the greatest speech 
intelligibility. Compression and EQ, if done well, can yield an 
effective 13 dB of gain! All of those dB add up with the power that 
we're running. Nearly all TV and radio broadcasting makes extensive use 
of dynamics processing to make their signal as loud as possible, and the 
most skilled use careful equalization on the microphones of talkers that 
matter.


73, Jim K9YC


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Re: [Elecraft] KXPA100 with PX3

[William Rascher]

Ray,

I had a simular problem and the solution was replacing a bad cable.  You might 
want to contact Elecraft support .

73, Bill  KT5TE

On Friday, December 30, 2016 2:29:08 PM CST Ray W2RS via Elecraft wrote:
> Ryan,
> 
> 
> Yes, I am using the correct adapter cable.
> 
> 
> 73 Ray W2RS
> 
> 
> -Original Message-
> From: Ryan Noguchi 
> To: rsoifer1 ; elecraft 
> Sent: Fri, Dec 30, 2016 8:43 am
> Subject: Re: [Elecraft] KXPA100 with PX3
> 
> >>http://www.elecraft.com/manual/PX3_installation_FAQ_v-0-8.pdf  see Figure
> >>3.>
> >When I tried that, I got no output from the KXPA100 with the KX3 PA MODE
> >set to ON.  If I set that to OFF, I get full output but then not full
> >interaction with the KX3.  What am I doing wrong?
> So are you saying that you have the KX3, PX3, and KXPA100 all connected in
> the exact manner depicted in Figure 3 (which also appears in the PX3
> manual) and you're still experiencing this problem? Maybe I'm mistaken, but
> it sounds like you aren't using the KX3-KXPA100 adapter cable. You can't
> just connect the KXPA100 RS232 port directly to the KX3 ACC1 port.
> 
> 
> 
> 73, Ryan AI6DO
> 
> 
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[Elecraft] Please do a KPA1500

[john]

Since I sometimes bring my station to the Caribbean, one of the main reasons
that I switched to the Elecraft line was for the size and weight. I have a
KPA500 and an it is an awesome amplifier but I would like a little more
power at times. I considered the Expert 1.3k that many with similar needs
use but I have not swapped my Elecraft due to the reasons that W4TV
mentioned below. It may not be practical for Elecraft to manufacture a small
lightweight KPA1500 at an affordable price however perhaps a KPA750 or
KPA1000 could be. I would certainly be interested in one of these. I read
many posts on this list saying that 3 or 4dBs make almost no difference. I
did a quick search of my last 200,000+ QSOs and could not find any of the
stations making this claim in my logs so I wonder how active they are on HF.

John KK9A 


From: Joe Subich W4TV

The Expert 1.3K also violates the 15 dB gain limitation rule and is a
real garbage generator.  Expert's own test data in their application
for FCC approval showed IMD at -27 dB at 800 W!  For your 1 KW, each
of the IMD products are probably around .5W and I'd hate to even
think about the IMD level at 1.3 KW!

73,

... Joe, W4TV


On 12/30/2016 11:07 PM, Ignacy wrote:
> With a little work, KPA500 can be a KW amp while losing weight. This is by
> using LDMOS and a commercial PS. But then KAT500 would have to be beefed
up
> to KAT1000.
>
> I have Expert 1.3k that I use with KX3 for > 1 KW. The Expert is 21 lbs
> (lighter than Elecraft) with a 3:1 tuner + 4 antenna switch and automatic
> 110/220V switching; KPA500/KAT500 would be 35 lbs + cables. Also without
> dealers markup, the no-ATU version is not that much expensive than KPA500.
> But the Expert needs Elecraft refinement.
>
> One KW is great when working portable as DX. Everybody responds even with
> impromptu antennas.
>
> Ignacy, NO9E

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Re: [Elecraft] {OT} - On Professional Error

[Phil Hystad]

And computer programmers relabel their “bugs” as  new features.


> On Dec 31, 2016, at 5:56 AM, Dauer, Edward  wrote:
> 
> Actually, it varies among the professions.
> 
> It has been noted in the professional liability field that while doctors get 
> to bury their mistakes, and no-one understands whether a lawyer made a 
> mistake or not, all that architects can do is plant shrubs. 
> 
> Ted, KN1CBR (one of the above)
> 
>--
> 
>Message: 17
>Date: Fri, 30 Dec 2016 17:04:34 -0800
>From: Fred Jensen 
>To: elecraft@mailman.qth.net
>Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch
>Message-ID: <9e29da0e-eccd-15cf-de21-bec26a127...@foothill.net>
>Content-Type: text/plain; charset=windows-1252; format=flowed
> 
>T-shirt the other day:
> 
>MECHANIC
> 
>Curious enough to take it apart
> 
>Professional enough to put it back together
> 
>Smart enough to hide the extra parts
> 
>73,
> 
>Fred K6DGW
>Sparks NV USA
>Washoe County DM09dn
> 
>On 12/30/2016 4:59 PM, Don Wilhelm wrote:
>> Ron and all,
>> 
>> I would differ from that a little bit.  The difference between the
>> amateur and the pro is that the pro knows how to conceal his mistakes.
>> Take it from a former woodworking pro.
>> 
>> I don't know how that transfers to electronics, a dead semiconductor
>> device is difficult to to conceal.
>> 
>> 73,
>> Don W3FPR
> 
> 
> 
>--
> 
> 
> 
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[Elecraft] Amplifiers in general

[Bill]

I have always been under the impression the doubling of output power 
will result in a power gain of 3 db. And, that 3 db gain is the least 
signal increase noticeable at the receiving point. KPA500 outputs 500 
Watts - 1000 Watts would give an output gain of 3 db (over the KPA500) 
and 1500 Watts a little over 4 db gain. That being my understanding - 
why would I want to spend a box full of dollars for more power than my 
KPA500 provides? Or, is my understanding flawed?


FWIW, I have run all kinds of amps in my nearly 60 years of being the on 
the air and have found that Watts are Watts, regardless of how you 
generate them (fancy, cheap, junk, or solid gold).


Everyone have a super HAPPY NEW YEAR!!!

Bill W2BLC K-Line (medium power HF)

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[Elecraft] Heatsink fro K144XV

[Jim Rogers]

A heatsink for the left side panel (from the front) of the K3(s) above 
the handle?  Someone said they had seen one advertised.


JIm, W4ATK

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[Elecraft] {OT} - On Professional Error

[Dauer, Edward]

Actually, it varies among the professions.

It has been noted in the professional liability field that while doctors get to 
bury their mistakes, and no-one understands whether a lawyer made a mistake or 
not, all that architects can do is plant shrubs. 

Ted, KN1CBR (one of the above)

--

Message: 17
Date: Fri, 30 Dec 2016 17:04:34 -0800
From: Fred Jensen 
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch
Message-ID: <9e29da0e-eccd-15cf-de21-bec26a127...@foothill.net>
Content-Type: text/plain; charset=windows-1252; format=flowed

T-shirt the other day:

MECHANIC

Curious enough to take it apart

Professional enough to put it back together

Smart enough to hide the extra parts

73,

Fred K6DGW
Sparks NV USA
Washoe County DM09dn

On 12/30/2016 4:59 PM, Don Wilhelm wrote:
> Ron and all,
>
> I would differ from that a little bit.  The difference between the
> amateur and the pro is that the pro knows how to conceal his mistakes.
> Take it from a former woodworking pro.
>
> I don't know how that transfers to electronics, a dead semiconductor
> device is difficult to to conceal.
>
> 73,
> Don W3FPR



--

 

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Re: [Elecraft] KXPA100 with PX3

[Ray W2RS via Elecraft]

The setting is OFF

.

-Original Message-
From: Ryan Noguchi 
To: rsoifer1 ; elecraft 
Sent: Fri, Dec 30, 2016 1:35 pm
Subject: Re:n [Elecraft] KXPA100 with PX3



>Further to my last email, when I am in Basic mode, with PA MODE set to OFF and 
>the KXPA100 on/off switch set to ON, I get full power out and no dissipation.  
>When PA MODE is ON and the on/off switch set to OFF, the KX3 acts like the 
>KXPA100 is connected to it but there is no power output from the KXPA100 but 
>all the power it produces is being dissipated.  Some setting is probably 
>wrong, but I can't figure out which one.











I'd suggest checking the ACC2 IO setting in the KX3 to make sure Tx keying 
isn't being inhibited. It's also possible that the interface cable is faulty. 




There's also the usual advice to make sure the firmware is current. My club's 
KX3 and KXPA100 were very unreliable until I updated their 2-3 year old 
firmware. Mostly intermittent problems with the ATU and even recognizing 
they're connected, but all that went away with fresh firmware. 




73, Ryan AI6DO



 
 
  


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Re: [Elecraft] Please do a KPA1500

[Joe Subich, W4TV]

I have Expert 1.3k that I use with KX3 for > 1 KW.


The Expert 1.3K also violates the 15 dB gain limitation rule and is a
real garbage generator.  Expert's own test data in their application
for FCC approval showed IMD at -27 dB at 800 W!  For your 1 KW, each
of the IMD products are probably around .5W and I'd hate to even
think about the IMD level at 1.3 KW!

73,

   ... Joe, W4TV


On 12/30/2016 11:07 PM, Ignacy wrote:

With a little work, KPA500 can be a KW amp while losing weight. This is by
using LDMOS and a commercial PS. But then KAT500 would have to be beefed up
to KAT1000.

I have Expert 1.3k that I use with KX3 for > 1 KW. The Expert is 21 lbs
(lighter than Elecraft) with a 3:1 tuner + 4 antenna switch and automatic
110/220V switching; KPA500/KAT500 would be 35 lbs + cables. Also without
dealers markup, the no-ATU version is not that much expensive than KPA500.
But the Expert needs Elecraft refinement.

One KW is great when working portable as DX. Everybody responds even with
impromptu antennas.

Ignacy, NO9E



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[Elecraft] FS: Remoterig RRC-1258MkIIs K3-Twin, UK Only

[Dave]

I am selling my RRC-1258MkIIs Twin as they are no longer needed for
transatlantic Radio Control.  Recently tested to control a remote K3 with a
subrx with a local K3. Comes with the set of radio cables I used. No power
supplies (as the radio power supply was used to power them) or Ethernet
cable. Both units have 2.90 software loads

 

Asking £330 including shipping to mainland uk ONLY. Prefer cheque but if
purchased by paypal, buyer pays any fees

 

Dave

G4fre, ww2r

 

Contact me through email: Elecraft at g4fre.com

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Re: [Elecraft] [Moon-Net] Elecraft transverter

[Edward R Cole]

This topic started on the Moon-Net reflector but I see it has 
migrated over here.


Most of you probably know that I run a business building kits that 
started with the DEMI transverters.  The 50-MHz thru 432-MHz 
transverters all can be equipped with the VHF-APOLLO synthesized LO, 
which is a single pcb which mounts on two standoffs above the main 
transverter board.  The kit comes with new DPDT power switch, 
mini-coax, hookup wire, blue LED lock indicator and BNC connector 
which provides connection with external 10-MHz reference.  DEMI sells 
the VHF-APOOLOK kit for $134 and I can install it for you for $25 
plus shipping.


But if you have a solder iron its a 30-minute to 1-hour task with no 
surface mount installation.  Kit comes with instruction sheet.  Synth 
board is fully assembled and kit only includes parts for installing it.


I have one on my L432-28 transverter and on my 1296-28 
transverter.  Not needed on 50-222 MHz in my opinion.


To get the best freq accuracy and stability install the TCXO-03 plus 
the EXREF in the K3.  My tests show +/- 2 Hz at 28-MHz on the K3.


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


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