[Elecraft] K3 For Sale

[Greg Mitchell]

My K3 is for sale (I'm now the proud owner of a K4). Rig works great. It's a 
100W model, with the KSYN3A synthesizer upgrade (K3S) and the KIO3B USB 
CAT/Soundcard (also from the K3S). It has the KXV3A transverter module as well 
as 5 filters: 2.7khz, 2.4khz, 500hz, 400hz and 250hz. Sale is for the radio and 
manual only (printed in a 3-ring binder). No mic or power cable. Asking $2100, 
and I'll ship it anywhere in the lower-48 - if elsewhere, email me for shipping 
quote. s/n is 5874.

Thanks and 73,
Greg KB1AWM
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[Elecraft] Amps with K2

[edauer]

I have used W8FGU's amplifier keying system with a K2 and a KPA1500 and can
say it works just as advertised.  The KPA1500 output is in the 200 - 225
watt range on CW (as I remember -- I did the tests a few months ago),
depending on band and K2 power setting; the TR switching time is fine for
fast break CW; and there is no discernible attenuation on receive.  The amp
does not poll directly for frequency, but using N1MM and the KIO2 the
frequency for logging purposes is there with no fuss.  The installation is
straightforward -- one small circuit board and then mount the board and an
RCA jack in an existing hole on the K2 rear deck and it's on the road.
Neat.

Ted, KN1CBR
--

Message: 14
Date: Sat, 29 Jan 2022 19:57:33 +
From: "Dave Van Wallaghen" 
To: KJ , "Elecraft Reflector"

Subject: Re: [Elecraft] KPXA-100 & K2 Integration?
Message-ID: 
Content-Type: text/plain; charset=utf-8; format=flowed

. . .  There are a number of circuits documented out there for this purpose.
I also sell a kit for doing this on my website: 
https://www.w8fgu.com/k2_trdriver.html. This circuit and kit was based on
one produced years ago by Tom Hammond, N0SS (SK). If you have the K60XV
module installed, then you can bring out the K60XV J2 pin 2 for this
purpose. I am doing exactly that on my K2. I mounted an RCA jack on the rear
panel and tied it to that pin.

The above will allow the K2 to drive an amp, but will not get you much
"integration". With our amplifier line, band switching can be automated with
a dit of RF from the K2. But other than that, tight integration like with
our newer transceivers is not there. The cables I am trying to develop will
attach to the K2's KIO2 AUX I/O port and provide keying. I have prototyped
one to work with the KXPA100 and it keys properly and allows RS-232 commands
to pass through the KXPA100 from the PC for control of the K2 by software
programs. The main issue with integrating the K2 with our amps is that there
is virtually no codes space left in the K2 firmware for having it
communicate and integrate with the other amps like it did with the KPA100.
So, things like amp power output and SWR will not be reflected on the K2
like it does with the KX2 & 3 when used with the KXPA100.. . . 

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Re: [Elecraft] RPN Calc App For Android

[Mike Morrow]

The HP-35 (1972) and the HP 35s (2007) are two radically different machines.
 
I was an EE undergrad at Georgia Tech when the HP-35 was introduced in 1972 at 
$400 ($2750 in 2022).  Professors generally did not allow their use on tests 
because so very few students (and professors) could afford them.
 
I have always preferred RPN-entry machines, but I could not afford one for more 
than two years after graduation.
 
The finest pure RPN (not RPL) machine ever made is the HP-42S (1988-1995).  It 
still brings prices above $300 on eBay and is worth it.
 
Thomas Okken's Free42 is the finest emulation of an HP RPN scientific 
calculator that has ever been available.  It is available for all major phone 
and computer platforms.  It's free, but donations are welcome and well deserved.
 
Mike / KK5F
 
-Original Message-
From: Frank Hale 
Sent: Jan 29, 2022 8:11 PM
To: Eric Garner 
Cc: Reflector Elecraft 
Subject: Re: [Elecraft] RPN Calc App For Android
 
First time posting to the reflector. Please forgive any errors.
 
I found this little inquiry and the resulting responses fascinating.
 
I'm old enough that:
(1) I had to use a slide rule in college chemistry classes, because
new-fangled electronic calculators were not allowed
(2) I learned RPN as part of understanding the FORTRAN compiler on an IBM
370
(3) I had to debug the early Intel Fortran-80 compiler on their 8008 MDS
system, because it was generating bad code
(4) I have an HP 35s RPN calculator as my "desk calculator," along with a
10" Post 1460 Versalog slide rule, and a 10" Sun Hemmi 255 slide rule
(5) I keep a 5" Pickett N600-ES slide rule (the "Apollo" slide rule) and a
5" Nestler Polymath-Duplex slide rule in my desk pencil holder
(6) I have the "Pocket Slide Rule Expert" app from TestTubeGames.com on my
iPhone (8 SE, ported from 4, because AT&T won't support the 4 anymore)
 
Sorry I can't help much with Android questions (never had one), but I did
enjoy the discussion of RPN and slide rules!
 
73,
 
Frank KN6QEK
 
On Sat, Jan 29, 2022 at 10:35 AM Eric Garner wrote:
 
> I use Droid48. It's a pretty faithful recreation of the HP48 and has a
> pocket calculator style interface too (but it's still RPN)
>
> https://play.google.com/store/apps/details?id=org.ab.x48
>
> Eric KI7LTT
>
> On Fri, Jan 28, 2022, 12:51 PM Jim Brown
> wrote:
>
> > The HP41 emulator I've used for years on older phones isn't compatible
> > with my new one. I still own a few simple RPN calcs, but the phone is
> > always in my pocket. Recommendations?
> >
> > Thanks and 73, Jim
 
 
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[Elecraft] Elecraft CW Net Announcement

[kevin]

Good Evening,

   It is easy to lose a mountain.  Mt. St. Helens is rarely visible 
from here.  If there is any haze in the sky it is almost invisible.  In 
the summer you need to know which bit of white is a mountain top, which 
is a cloud, and which is the top of Mt. Rainier.  Tuesday's weather was 
very nice.  50 degrees with humidity down to 60%, perfect for cutting 
wood.  I moved, cut, split, and stacked until I was soaked.  Then I went 
for a walk to cool down.  I hiked to Bacona Road, about a mile from 
here.  When I turned around Mt. St. Helens dominated the landscape to 
the northeast.  The sky was so clear and the snow line so low it seemed 
huge.  The sun was an hour from setting which cast raking shadows with 
golden highlights.  What a view.


   More sunspots appeared this week, some groups are growing very 
large.  2936 could send something our way.  Flux is above 100. 
Propagation should be better than last week.  There won't be an active 
storm to create so much noise.  But, as always, you never know until you 
try.



Please join us on (or near):

14050 kHz at 2300z Sunday  (3 PM PST Sunday)
 7047 kHz at 0030z Monday  (4:30 PM PST Sunday)

   73,
  Kevin. KD5ONS




-




Silver is not a good adjective to describe what I felt when he told me 
about trout fishing.  I'd like to get it right.  Maybe trout steel.  
Steel made from trout. The clear snow-filled river acting as foundry and 
heat.  Imagine Pittsburgh.  A steel that comes from trout, used to make 
buildings, trains and tunnels. The Andrew Carnegie of Trout!



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Re: [Elecraft] RPN Calc App For Android

[Frank Hale]

First time posting to the reflector.  Please forgive any errors.

I found this little inquiry and the resulting responses fascinating.

I'm old enough that:
(1) I had to use a slide rule in college chemistry classes, because
new-fangled electronic calculators were not allowed
(2) I learned RPN as part of understanding the FORTRAN compiler on an IBM
370
(3) I had to debug the early Intel Fortran-80 compiler on their 8008 MDS
system, because it was generating bad code
(4) I have an HP 35s RPN calculator as my "desk calculator," along with a
10" Post 1460 Versalog slide rule, and a 10" Sun Hemmi 255 slide rule
(5) I keep a 5" Pickett N600-ES slide rule (the "Apollo" slide rule) and a
5" Nestler Polymath-Duplex slide rule in my desk pencil holder
(6) I have the "Pocket Slide Rule Expert" app from TestTubeGames.com on my
iPhone (8 SE, ported from 4, because AT&T won't support the 4 anymore)

Sorry I can't help much with Android questions (never had one), but I did
enjoy the discussion of RPN and slide rules!

73,

Frank KN6QEK



On Sat, Jan 29, 2022 at 10:35 AM Eric Garner  wrote:

> I use Droid48. It's a pretty faithful recreation of the HP48 and has a
> pocket calculator style interface too (but it's still RPN)
>
> https://play.google.com/store/apps/details?id=org.ab.x48
>
> Eric KI7LTT
>
> On Fri, Jan 28, 2022, 12:51 PM Jim Brown 
> wrote:
>
> > The HP41 emulator I've used for years on older phones isn't compatible
> > with my new one. I still own a few simple RPN calcs, but the phone is
> > always in my pocket. Recommendations?
> >
> > Thanks and 73, Jim K9YC
> > __
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Elecraft@mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to garn...@gmail.com
> >
> __
> Elecraft mailing list
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> Message delivered to hodie.illumina...@gmail.com
>


-- 
Frank Hale, KN6QEK
Reach me at any of the following:
"Zot! Zot!"  fvh...@alumni.uci.edu
"Go Bears!"  fvh...@berkeley.edu
"CQ CQ"  kn6...@arrl.net
and GMRS WROI375.

"You see, wire telegraph is a kind of a very, very long cat.
You pull his tail in New York,
and his head is meowing in Los Angeles.
Do you understand this?
And radio operates exactly the same way:
you send signals here, they receive them there.
The only difference is that there is no cat."
[Attr. Albert Einstein]]
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Re: [Elecraft] Fwd: SPL N/A

[Don Greenbaum]

Make sure both VFOs are in data mode (or the same mode).

A>B usually works best.

Don

At 04:16 PM 1/29/2022, Vincent Diak wrote:
Sent from my iPhone Begin forwarded message: > From: Uncle Ben 
 > Date: January 29, 2022 at 10:04:56 AM EST > To: 
elecraft-requ...@mailman.qth.net > Subject: SPL N/A > >  > BLIZARD 
TODAY AT CAPE MAY,NJ - Need help with reading in sub B - when transmit ft8 
I see in sub rec. B it says SPL N/A ? SPL N/A Does anyone know what this 
means ? And how do I stop it from appearing each time FT8 transmits. > 
Thank You All ! wb2pdw 73 let it snow -let it snow - let it snow 
__ Elecraft 
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This list hosted by: http://www.qsl.net Please help support this email 
list: http://www.qsl.net/donate.html Message delivered to d...@aurumtel.com


Duxbury, MA 02332

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[Elecraft] Fwd: SPL N/A

[Vincent Diak]

Sent from my iPhone

Begin forwarded message:

> From: Uncle Ben 
> Date: January 29, 2022 at 10:04:56 AM EST
> To: elecraft-requ...@mailman.qth.net
> Subject: SPL N/A
> 
> 
> BLIZARD TODAY AT CAPE MAY,NJ - Need help with reading in sub B - when 
> transmit ft8 I see in sub rec. B it says SPL N/A ? SPL N/A Does anyone know 
> what this means ? And how do I stop it from appearing each time FT8 
> transmits. 
> Thank You All ! wb2pdw 73 let it snow -let it snow - let it snow 
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Re: [Elecraft] KPXA-100 & K2 Integration?

[Linda M]

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Re: [Elecraft] KPXA-100 & K2 Integration?

[Dave Van Wallaghen]

Well, it has been over 3 years now and I didn't have any hair when I 
started ;-)


73,
Dave, W8FGU


On 1/29/2022 3:42:46 PM, "Linda M"  wrote:


Hi Dave………

Thanks for getting into the Elecraft Support Bizz.

I worked for one of the Ham Equipment Suppliers long ago.

You’re in for a Glutten for Punishment. 😊   I wont say More !

Ray Maxfield- WA6VAB  K3





From: Dave Van Wallaghen 
Sent: Saturday, January 29, 2022 11:57 AM
To: KJ ; Elecraft Reflector 


Subject: Re: [Elecraft] KPXA-100 & K2 Integration?



Hi Ken,



I service all of Elecraft's Classic Line of Products through my company

W8FGU Services, LLC and I am a part time employee of Elecraft doing the

same thing for them. I can assure you that discontinuing the KPA100 was

no arbitrary decision. As with most 20 year and older designs, part

availability becomes more and more of an issue with every passing year.

When we were not able to procure the finals anymore, I believe this was

one of the final straws. They stopped producing the finals a couple of

years ago as far as we can tell. There are some counterfeit versions on

the market and auction sites, but the are not up to spec. This combined

with other unavailable parts led to the demise of the KPA100. I worked

pretty hard with Wayne, Eric and our parts folks to come up with a

solution, but in the end, it was decided to discontinue it.



I am actively working on a project to create cables that will interface

the K2 with each of our amplifier products including the KXPA100. With

the addition of a keying line from the K2, you can form a basic

integration to most any amplifier. The basic 10 watt version does not

have an external keying line and would need a keying circuit added to

the K2 bring it out. There are a number of circuits documented out 
there


for this purpose. I also sell a kit for doing this on my website:

https://www.w8fgu.com/k2_trdriver.html. This circuit and kit was based

on one produced years ago by Tom Hammond, N0SS (SK). If you have the

K60XV module installed, then you can bring out the K60XV J2 pin 2 for

this purpose. I am doing exactly that on my K2. I mounted an RCA jack 
on


the rear panel and tied it to that pin.



The above will allow the K2 to drive an amp, but will not get you much

"integration". With our amplifier line, band switching can be automated

with a dit of RF from the K2. But other than that, tight integration

like with our newer transceivers is not there. The cables I am trying 
to


develop will attach to the K2's KIO2 AUX I/O port and provide keying. I

have prototyped one to work with the KXPA100 and it keys properly and

allows RS-232 commands to pass through the KXPA100 from the PC for

control of the K2 by software programs. The main issue with integrating

the K2 with our amps is that there is virtually no codes space left in

the K2 firmware for having it communicate and integrate with the other

amps like it did with the KPA100. So, things like amp power output and

SWR will not be reflected on the K2 like it does with the KX2 & 3 when

used with the KXPA100.



For use with the KPA500 and KAT500 Power Combo and the KPA1500, I am

going to prototype similar style cables for those amps as well. The 
good


thing we've found with the Power Combo is that you can set it up to 
poll


for frequency info from the K2 so that you have automatic band 
switching


and proper loading of ATU memories while tuning around with the K2 VFO.

The KPA1500 has the same capability but will require some modification

of the cable as it is not implemented the same way as the KPA500. At

this point the KXPA100 does not poll at all unless it recognizes the

XCVR as a KX2 or 3.



So, "full integration" may not be totally possible because of the lack

of code space in the K2. But I believe I can get some "nice to have"

integration like automatic band switching and ATU memory loading with

our amplifier line. I am working closely with my tech counter parts at

Elecraft to bring these cables to fruition soon we hope. Stay tuned...



73,

Dave, W8FGU





On 1/29/2022 1:01:33 PM, "KJ"  wrote:



>Hello again all,

>Can the KPXA-100 be fully integrated with the K2? Full QSK and so on? 
Appears to be mostly for the KX3 and KX2.


>My 2003 K2 has all the options.

>

>I can't believe Elecraft discontinued the 100w amp for the K2. What do 
have then?


>A full featured, basically, QRP radio! These little 5 watt jobs are 
1/8th the size but maybe w/o all the bands and there all over the place 
for sale.


>

>Should have bought the KPA-100 back then but the $$ weren't there!!

>Anybody has one up for salelet me know

>

>Thanks!! Ken

>W2GIW, QRZ address is good.

>__

>Elecraft mailing list

>Home: http://mailman.qth.net/mailman/listinfo/elecraft

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>Post: mailto:Elecraf

Re: [Elecraft] KPXA-100 & K2 Integration?

[Linda M]

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Re: [Elecraft] KPXA-100 & K2 Integration?

[Dave Van Wallaghen]

Hi Ken,

I service all of Elecraft's Classic Line of Products through my company 
W8FGU Services, LLC and I am a part time employee of Elecraft doing the 
same thing for them. I can assure you that discontinuing the KPA100 was 
no arbitrary decision. As with most 20 year and older designs, part 
availability becomes more and more of an issue with every passing year. 
When we were not able to procure the finals anymore, I believe this was 
one of the final straws. They stopped producing the finals a couple of 
years ago as far as we can tell. There are some counterfeit versions on 
the market and auction sites, but the are not up to spec. This combined 
with other unavailable parts led to the demise of the KPA100. I worked 
pretty hard with Wayne, Eric and our parts folks to come up with a 
solution, but in the end, it was decided to discontinue it.


I am actively working on a project to create cables that will interface 
the K2 with each of our amplifier products including the KXPA100. With 
the addition of a keying line from the K2, you can form a basic 
integration to most any amplifier. The basic 10 watt version does not 
have an external keying line and would need a keying circuit added to 
the K2 bring it out. There are a number of circuits documented out there 
for this purpose. I also sell a kit for doing this on my website: 
https://www.w8fgu.com/k2_trdriver.html. This circuit and kit was based 
on one produced years ago by Tom Hammond, N0SS (SK). If you have the 
K60XV module installed, then you can bring out the K60XV J2 pin 2 for 
this purpose. I am doing exactly that on my K2. I mounted an RCA jack on 
the rear panel and tied it to that pin.


The above will allow the K2 to drive an amp, but will not get you much 
"integration". With our amplifier line, band switching can be automated 
with a dit of RF from the K2. But other than that, tight integration 
like with our newer transceivers is not there. The cables I am trying to 
develop will attach to the K2's KIO2 AUX I/O port and provide keying. I 
have prototyped one to work with the KXPA100 and it keys properly and 
allows RS-232 commands to pass through the KXPA100 from the PC for 
control of the K2 by software programs. The main issue with integrating 
the K2 with our amps is that there is virtually no codes space left in 
the K2 firmware for having it communicate and integrate with the other 
amps like it did with the KPA100. So, things like amp power output and 
SWR will not be reflected on the K2 like it does with the KX2 & 3 when 
used with the KXPA100.


For use with the KPA500 and KAT500 Power Combo and the KPA1500, I am 
going to prototype similar style cables for those amps as well. The good 
thing we've found with the Power Combo is that you can set it up to poll 
for frequency info from the K2 so that you have automatic band switching 
and proper loading of ATU memories while tuning around with the K2 VFO. 
The KPA1500 has the same capability but will require some modification 
of the cable as it is not implemented the same way as the KPA500. At 
this point the KXPA100 does not poll at all unless it recognizes the 
XCVR as a KX2 or 3.


So, "full integration" may not be totally possible because of the lack 
of code space in the K2. But I believe I can get some "nice to have" 
integration like automatic band switching and ATU memory loading with 
our amplifier line. I am working closely with my tech counter parts at 
Elecraft to bring these cables to fruition soon we hope. Stay tuned...


73,
Dave, W8FGU


On 1/29/2022 1:01:33 PM, "KJ"  wrote:


Hello again all,
Can the KPXA-100 be fully integrated with the K2? Full QSK and so on? Appears 
to be mostly for the KX3 and KX2.
My 2003 K2 has all the options.

I can't believe Elecraft discontinued the 100w amp for the K2. What do have 
then?
A full featured, basically, QRP radio! These little 5 watt jobs are 1/8th the 
size but maybe w/o all the bands and there all over the place for sale.

Should have bought the KPA-100 back then but the $$ weren't there!!
Anybody has one up for salelet me know

Thanks!! Ken
W2GIW, QRZ address is good.
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Re: [Elecraft] Seeking input on 3rd-party microphones used with our transceivers

[Christian Friess]

I can recommend the HYPERX CloudX and the NUBWO N7 www.nubwo.com with 
3,5mm plugs for the connectors at the rear of K3 / K3S


73 de Chris
-DL2MDU-

Am 28.01.2022 um 19:53 schrieb Wayne Burdick:

If you're using a non-Elecraft mic with any of our radios (K2, K3, K4, KX2, 
KX3), please send me a very brief reply with the manufacturer, model number, 
and a note about whether any modifications were required. We're putting 
together a database of these for customer reference.

Thanks!

Wayne
N6KR

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Re: [Elecraft] RPN Calc App For Android

[Eric Garner]

I use Droid48. It's a pretty faithful recreation of the HP48 and has a
pocket calculator style interface too (but it's still RPN)

https://play.google.com/store/apps/details?id=org.ab.x48

Eric KI7LTT

On Fri, Jan 28, 2022, 12:51 PM Jim Brown  wrote:

> The HP41 emulator I've used for years on older phones isn't compatible
> with my new one. I still own a few simple RPN calcs, but the phone is
> always in my pocket. Recommendations?
>
> Thanks and 73, Jim K9YC
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Re: [Elecraft] K4HD Executive Summary Request -- strong signal performance

[Victor Abell]

Thank you for your explanation Wayne.  You are correct; turning off the
noise blanker eliminates wide-band key clicks from strong, wide signals.

Trying to put numbers to your "Aggressive settings of the noise blanker,"
I set about to find the NB level at which the clicks became noticeable.  To
my surprise, for the first strong signal I heard,  I found NB levels of zero
and 25 produced clicks, but a level of 14 did not.  For other strong signals I
heard over the next few days, a NB level of 0 always produced clicks, while
other levels had varying effects.  In the end all I learned  was that NB
levels were mostly unpredictable in how they produced signal artifacts,
except that they almost always did.

Vic, W9RGB

> Message: 10
> Date: Wed, 26 Jan 2022 12:37:48 -0800
> From: Wayne Burdick 
> To: Victor Abell 
> Cc: Elecraft Reflector 
> Subject: Re: [Elecraft] K4HD Executive Summary Request -- strong
>signal performance
> Message-ID: 
> Content-Type: text/plain; charset=us-ascii
>
> Aggressive settings of the noise blanker can cause signal artifacts. Make 
> sure the NB is off for any wide band tests.
>
> 73,
> Wayne
> N6KR
>
>> On Jan 26, 2022, at 11:20 AM, Victor Abell  
>> wrote:
>> 
>> While I have a K4HD module on order for my K4D (0406) I am also
>> interested in Wayne's comment about strong signal performance.
>> 
>> On the CW bands, particularly 17 meters where I often operate,
>> many times I have observed strong CW signals whose keying causes
>> key clicks to appear some KHz away from their frequency.  For example,
>> the other night a strong signal from W1AW code practice at 18.0975
>> could be copied by its key clicks at 18.079.
>> 
>> I have heard this behavior on other bands -- e.g., 40 and 20 meters --
>> and have reported it to supp...@elecraft.com, along with videos.
>> So far I haven't heard any explanation for these key clicks.  It could
>> be that I have a flawed K4D or am using some settings that cause it.
>> (I wasn't using either pre-amp when I heard  W1AW's clicks.)
>> 
>> Vic, W9RGB
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[Elecraft] KPXA-100 & K2 Integration?

[KJ]

Hello again all,
Can the KPXA-100 be fully integrated with the K2? Full QSK and so on? Appears 
to be mostly for the KX3 and KX2.
My 2003 K2 has all the options.

I can't believe Elecraft discontinued the 100w amp for the K2. What do have 
then?
A full featured, basically, QRP radio! These little 5 watt jobs are 1/8th the 
size but maybe w/o all the bands and there all over the place for sale.

Should have bought the KPA-100 back then but the $$ weren't there!!
Anybody has one up for salelet me know

Thanks!! Ken
W2GIW, QRZ address is good.
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Re: [Elecraft] K4 Production Relase 28 and SWR display issues

[Andy Durbin]

" I wrote code to invalidate and dash my display of the serial data SWR based 
on forward power level. "

That wasn't accurate.  What I actually do is "dash" the SWR display if there 
has been no TX on current TX frequency (+/- 500 Hz).  I display X.XX if there 
was a TX on current frequency but forward power level was lower that the value 
assumed to give a valid SWR reading.

Yes, it's more complex than most SWR displays but I have a low tolerance for 
misleading data.

Andy, k3wyc


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[Elecraft] K3 Tuner

[1lasportsman]

My tuner on K3 shows tuning but ends up with - - in display it does not show 
swr just noticed it a couple days ago.

any suggestion on tuner?

I tried tuning on 20m antenna and with dummy load.

The radio on antenna works as i talked to ham in Virginia with no swr showing.

Bill

WF9M
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Re: [Elecraft] K4 Production Relase 28 and SWR display issues

[Andy Durbin]

"Here is what I've done for the test:

- bypass the internal KAT4 ATU
- de-tune my Palstar BT1500A external tuner for an SWR of about 1:2
- use the keyer to send in CW. SWR (bargraph in display) shows 1:2. Okay!
- use the MH4 to send in USB and say "h". SWR shows 1:2. Okay!
- use the MH4 to send in AM (carrier only). SWR shows 1:1. Not okay! (?)
- use the MH4 to send in AM and additionally say "h". SWR shows 1:2. Maybe 
okay. (??)
- use the MH4 to send in FM (carrier only). SWR shows 1:2. Okay!
- use the TUNE butten in WSJT-X to send in DATA. SWR shows 1:1. Not okay!

In every mode, using the TUNE button of the K4 shows an SWR of 1:2. Okay!"

For each of the cases that gives misleading 1:1 indication - What is the 
reading if you increase the output power?

Reason for the question is that KAT500 has an insensitive bridge and always 
gives misleading 1:1 SWR reading at low power.  I wrote code to invalidate  and 
dash my display of the serial data SWR based on forward power level.  Perhaps a 
similar issue in K4. 

Andy, k3wyc
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Re: [Elecraft] RPN Calc App For Android

[Jim Brown]

On 1/28/2022 6:01 PM, Geoffrey Feldman wrote:

I almost hesitate to weigh in since so many others have.   The HP41 app is
actually an emulator which runs the actual firmware from the original
calculator.


Thanks for all the great input, guys!

73, Jim K9YC
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[Elecraft] K4 Production Relase 28 and SWR display issues

[Ludwig Hechler]

I have installed the production release R28.

My K4 (serial # 0223) has a built-in KAT4.

In early September 2021 I reported an issue with the
SWR bargraph display of my K4 to Elecraft support.
In some modes the SWR always shows 1:1 although
the real SWR is 1:2 or higher.

Rob from Elecraft Customer Support answered : "I was
able to reproduce that here. I have reported it to our
engineers as a bug. It should be fixed in an upcoming
release. I don't know if it will make it in the R23 release
which is coming out soon." Unfortunatly, it didn't make it
in R28. Is it planned for R29?

Here is what I've done for the test:

- bypass the internal KAT4 ATU
- de-tune my Palstar BT1500A external tuner for an SWR of about 1:2
- use the keyer to send in CW. SWR (bargraph in display) shows 1:2. Okay!
- use the MH4 to send in USB and say "h". SWR shows 1:2. Okay!
- use the MH4 to send in AM (carrier only). SWR shows 1:1. Not okay! (?)
- use the MH4 to send in AM and additionally say "h". SWR shows 1:2. Maybe 
okay. (??)
- use the MH4 to send in FM (carrier only). SWR shows 1:2. Okay!
- use the TUNE butten in WSJT-X to send in DATA. SWR shows 1:1. Not okay!

In every mode, using the TUNE button of the K4 shows an SWR of 1:2. Okay!

I also placed a video of my problem at DropBox then. Here is the link again:
https://www.dropbox.com/s/6l0oztx1xfhfon4/K4-SWR-Problems.MTS?dl=0

Lui, DL6FBR

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Re: [Elecraft] RPN Calc App For Android

[W Paul Mills]

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