[Elecraft] Elecraft CW Net Announcement

[kevinr]

Good Evening,

   The wind switched direction on Tuesday to come out of the east.  
Within an hour I could see the smoke flowing through the trees.  Then 
ash started falling.  Luckily the smoke did not smell like a local 
fire.  It was from a fire in the Gifford Pinchot Forest in Washington.  
The power went out just after dinner and stayed off until dawn.  Same 
thing on Wednesday but the smoke stream would flow north of me for a 
while.  But the power went out again for the night and back on again at 
dawn.  While I was busy up here, four large fires started along the west 
side of the Cascade Range.  Then the wind stopped blowing and the 
Willamette Valley filled with smoke.  By Thursday the west half of the 
state was solid smoke.  On Friday all of Oregon, all of California, and 
half of Washington was solid smoke.  The fires aren't close but they are 
very large.  Rain on Tuesday will make a big difference.


  The smoke is dense enough to interfere with my wireless 'net 
connection to the top of the mountain.  Last night I watched movies 
across my local network instead of streaming one from the 'net.  It 
slowed to where it was hard to send email.  Here is a link to a GIS map 
you can set for hot spots and fire updates.  It gives you a feel for the 
activity level of each of the fires.





Please join us on (or near):

14050 kHz at 2200z Sunday (3 PM PDT Sunday)
 7047 kHz at 0045z Monday (5:45 PM PDT Sunday)

   73,
  Kevin. KD5ONS


_

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Re: [Elecraft] KX3 SWR meter accuracy on 50 MHz?

[Drew Arnett]

I did before shipping in for repair with a directional coupler.  Looked great.

On Sat, Sep 12, 2020 at 7:13 PM Nr4c  wrote:
>
> Well, it depends on the “Dummy” load.  Have you swept the load with a good 
> spectrum analyzer or VNA?  It may not be 50 ohms at 50 MHz
>
>
>
> Sent from my iPhone
> ...nr4c. bill
>
>
> > On Sep 12, 2020, at 11:51 AM, Drew Arnett  wrote:
> >
> > After getting my KX3 back from repair (before my next planned contest
> > operation, thanks!), I ran some measurements to both see how great the
> > repairs were and to get a new baseline for future measurements.  TX
> > efficiency problem was gone.
> >
> > However, I'm left to wonder about the accuracy of the internal SWR
> > meter for 50 MHz.  Using a microwave dummy load of adequate power
> > rating and just a coaxial adapter, I measured the following:
> >
> > 14 MHz @ 1 W setting
> > VSWR 1.0 to 1 (per KX3)
> >
> > 28 MHz @ 1 W setting
> > VSWR 1.0 to 1
> >
> > 50 MHz @ 1 W setting
> > VSWR 1.5 to 1
> >
> > 50 MHz @ 4 W setting
> > VSWR 1.6 to 1
> >
> > Not horrible.  Not great.
> >
> > It's fine if it's not as accurate on 50 MHz.  I just want to know if
> > this is normal.  Has anyone else looked at that and can share what
> > they see?
> >
> > Thanks and best regards,
> >
> > Drew
> > n7da
> > __
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Re: [Elecraft] No Tx audio after WSJT upgrade

[Rich]

I guess to simplify it, It does pick the correct codec, it does not 
recognize that you changed the name of the codec.


And I think this is probably getting way off topic for the Elecraft list 
and I apologize


Rich

On 9/12/2020 21:08 PM, Josh Fiden wrote:

Interesting. I’ve been using WSJT, then WSJT-X with Win 7 for several years. 
First with the built-in sound device and then an external USB Tascam US-200 
interface (to a K3, not S). Selected the correct audio devices from WSJT-X 
setup and it just worked. Never knew there were issues. Ignorance is bliss, I 
suppose!

73
Josh W6XU

Sent from my iPad


On Sep 12, 2020, at 5:20 PM, Gwen Patton  wrote:

What version of Windows are you using? Windows 7 notoriously has a massive
problem with WSJT-X, JS8CALL, and some other programs that use similar
routines to poll the sound devices. For YEARS, I couldn't use WSJT-X
normally, because while it would find all of my speakers, it would never
find my currently installed microphones. I had to use a convoluted system
of default devices and Voicemeeter mixer software to get it to work. What
finally solved the problem permanently was when my 9 year old Windows 7
machine died, and I replaced it recently with a brand new machine with
Windows 10.


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Re: [Elecraft] No Tx audio after WSJT upgrade

[Josh Fiden]

Interesting. I’ve been using WSJT, then WSJT-X with Win 7 for several years. 
First with the built-in sound device and then an external USB Tascam US-200 
interface (to a K3, not S). Selected the correct audio devices from WSJT-X 
setup and it just worked. Never knew there were issues. Ignorance is bliss, I 
suppose!

73
Josh W6XU

Sent from my iPad

> On Sep 12, 2020, at 5:20 PM, Gwen Patton  wrote:
> 
> What version of Windows are you using? Windows 7 notoriously has a massive
> problem with WSJT-X, JS8CALL, and some other programs that use similar
> routines to poll the sound devices. For YEARS, I couldn't use WSJT-X
> normally, because while it would find all of my speakers, it would never
> find my currently installed microphones. I had to use a convoluted system
> of default devices and Voicemeeter mixer software to get it to work. What
> finally solved the problem permanently was when my 9 year old Windows 7
> machine died, and I replaced it recently with a brand new machine with
> Windows 10.
> 

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Re: [Elecraft] No Tx audio after WSJT upgrade

[Rich]

Nope.  I just changed the name of the codec for my 7300 from IC7300 
Audio In to IC7300a Audio In.  I rebooted Windows and WJST-X stills 
thinks it is IC7300 Audio In.  This is somewhat of a mute point as it is 
still the same codec and WJST-X still works fine.   My point is only 
that WJST-X is not refreshing from the sound panel after an install.


Rich

On 9/12/2020 19:57 PM, Neil Zampella wrote:

Actually ... WSJT-X only uses what windows tells it is available.
After Windows updates its been found that Windows will scramble the
audio devices, especially if they are USB devices.

What has been found to work is to RENAME the device you use in the Sound
Control Panel.  Bring up the Sound Control Panel, find the USB adapter
normally used for sound input to WSJT-X under Speakers and double click
to open the properties.   On the first tab you can rename it to what you
want to use, such as WSJT-X Sound OUT.   Do the same with the microphone
device and rename to WSJT-X Sound IN.

Click the OK button, and then close the Sound Control Panel.   I'd do a
restart to make sure that Windows has saved that info.   Then open
WSJT-X and select them on the Audio setting tab.

Most of the users who have done this have not see the 'scrambled audio
device' issue again.

Neil, KN3ILZ

On 9/12/2020 9:22 AM, Rich wrote:

WJST-X does a very poor job of loading the current sound devices from
Windows when you run the program.   It appears to load whatever
existed in the Sound Panel when it was installed.

So use caution that what you see in the WJST-X audio window vs. what
actually exists in the Windows Sound Panel.

To me it appears to be more of WJST-X issue that a Windows issue

Maybe there is a way to fix this, but I do not know what it is.

Rich

On 9/12/2020 7:20 AM, Ian Kahn, NV4C wrote:

Joe,

Check your WSJT-X settings and ensure you still have the correct
sound card selected and that something didn't change your output
target/radio selection. Also, if you're running Windows, make sure
something else didn't change any of your sound card settings from
what you had prior to upgrading WSJT-X.

73 de,

Ian, NV4C

On 9/11/20 11:23 PM, W8JH wrote:

I was working FT8 tonight and decided to upgrade from WSJT 2.0 to
the latest
2.2.

Now I have no audio on transmit. All other functions work. Decodes,
band
change etc.

It puts the K3s in transmit but no audio. I have adjusted the Mic gain
without effect.

I double checked that WSJT has the K3s codec for transmit selected.
Windoze
shows it working as well.

I’m totally stumped and wish I hadn’t upgraded now. Any ideas how to
proceed
?

73,



-
73,

Joe, W8JH

K3s, KPA 500, KAT 500 and  KX3 happy user.
--
Sent from: http://elecraft.365791.n2.nabble.com/
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Re: [Elecraft] No Tx audio after WSJT upgrade

[Gwen Patton]

What version of Windows are you using? Windows 7 notoriously has a massive
problem with WSJT-X, JS8CALL, and some other programs that use similar
routines to poll the sound devices. For YEARS, I couldn't use WSJT-X
normally, because while it would find all of my speakers, it would never
find my currently installed microphones. I had to use a convoluted system
of default devices and Voicemeeter mixer software to get it to work. What
finally solved the problem permanently was when my 9 year old Windows 7
machine died, and I replaced it recently with a brand new machine with
Windows 10.

I'm not sure why that happens, but Windows versions below 10 seem to have a
major issue with enumeration of sound devices.

-=-=-=-=-=-=-=-=-
73,
Gwen, NG3P


On Sat, Sep 12, 2020 at 7:57 PM Neil Zampella  wrote:

> Actually ... WSJT-X only uses what windows tells it is available.
> After Windows updates its been found that Windows will scramble the
> audio devices, especially if they are USB devices.
>
> What has been found to work is to RENAME the device you use in the Sound
> Control Panel.  Bring up the Sound Control Panel, find the USB adapter
> normally used for sound input to WSJT-X under Speakers and double click
> to open the properties.   On the first tab you can rename it to what you
> want to use, such as WSJT-X Sound OUT.   Do the same with the microphone
> device and rename to WSJT-X Sound IN.
>
> Click the OK button, and then close the Sound Control Panel.   I'd do a
> restart to make sure that Windows has saved that info.   Then open
> WSJT-X and select them on the Audio setting tab.
>
> Most of the users who have done this have not see the 'scrambled audio
> device' issue again.
>
> Neil, KN3ILZ
>
> On 9/12/2020 9:22 AM, Rich wrote:
> > WJST-X does a very poor job of loading the current sound devices from
> > Windows when you run the program.   It appears to load whatever
> > existed in the Sound Panel when it was installed.
> >
> > So use caution that what you see in the WJST-X audio window vs. what
> > actually exists in the Windows Sound Panel.
> >
> > To me it appears to be more of WJST-X issue that a Windows issue
> >
> > Maybe there is a way to fix this, but I do not know what it is.
> >
> > Rich
> >
> > On 9/12/2020 7:20 AM, Ian Kahn, NV4C wrote:
> >> Joe,
> >>
> >> Check your WSJT-X settings and ensure you still have the correct
> >> sound card selected and that something didn't change your output
> >> target/radio selection. Also, if you're running Windows, make sure
> >> something else didn't change any of your sound card settings from
> >> what you had prior to upgrading WSJT-X.
> >>
> >> 73 de,
> >>
> >> Ian, NV4C
> >>
> >> On 9/11/20 11:23 PM, W8JH wrote:
> >>> I was working FT8 tonight and decided to upgrade from WSJT 2.0 to
> >>> the latest
> >>> 2.2.
> >>>
> >>> Now I have no audio on transmit. All other functions work. Decodes,
> >>> band
> >>> change etc.
> >>>
> >>> It puts the K3s in transmit but no audio. I have adjusted the Mic gain
> >>> without effect.
> >>>
> >>> I double checked that WSJT has the K3s codec for transmit selected.
> >>> Windoze
> >>> shows it working as well.
> >>>
> >>> I’m totally stumped and wish I hadn’t upgraded now. Any ideas how to
> >>> proceed
> >>> ?
> >>>
> >>> 73,
> >>>
> >>>
> >>>
> >>> -
> >>> 73,
> >>>
> >>> Joe, W8JH
> >>>
> >>> K3s, KPA 500, KAT 500 and  KX3 happy user.
> >>> --
> >>> Sent from: http://elecraft.365791.n2.nabble.com/
> >>> __
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> >>> Message delivered to nv4c@gmail.com
> >> __
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Re: [Elecraft] K1ZTE - KAT500

[Nr4c]

Yes. Once stored they are there until replaced or cleared 

Sent from my iPhone
...nr4c. bill


> On Sep 12, 2020, at 6:25 PM, Ted Edwards W3TB  wrote:
> 
> Related question:  Should the KAT-500 hold memorized settings after
> shutting down to ready for use another time?
> 
>> On Sat, Sep 12, 2020 at 17:11 KENT TRIMBLE  wrote:
>> 
>> With nearly all modern transceivers nowadays, the trick is to set the
>> 
>> power on AM to 25 watts (which is the most you should ever run a 100
>> 
>> watt transceiver on AM), and use AM to tune your KAT500.  This puts a
>> 
>> carrier into the tuner at an acceptable low power.
>> 
>> 
>> 
>> You can tune it in CW mode, but that requires turning the transceiver's
>> 
>> power output down, and then turning it back up.  By using AM the power
>> 
>> is already set at 25 and doesn't need further adjusting.  Some ops like
>> 
>> to tune in FM mode, but I prefer AM.
>> 
>> 
>> 
>> When the KAT500 has finished its routine, switch back to SSB at 100
>> 
>> watts (or whatever you want).
>> 
>> 
>> 
>> 73,
>> 
>> 
>> 
>> Kent  K9ZTV
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>> On 9/12/2020 4:04 PM, Russell Domareck via Elecraft wrote:
>>> 
>>> Is what I am doing the only way to do this?  I have read related posts
>> on this subject but they did not satisfactorily answer my question.
>> 
>>> __
>> 
>>> Elecraft mailing list
>> 
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>> 
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>> 
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>> 
>>> Message delivered to k9...@socket.net
>> 
>>> 
>> 
>> 
>> 
>> __
>> 
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>> Message delivered to w3tb@gmail.com
> 
> -- 
> 73 de Ted Edwards, W3TB and GØPWW
> 
> and thinking about operating CW:
> "Do today what others won't,
> so you can do tomorrow what others can't."
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Re: [Elecraft] K1ZTE - KAT500

[Ted Edwards W3TB]

This is all very helpful.
I have apparently been doing things wrong by bringing the Auto button to
flash When setting frequencies and leaving the Auto button on to
‘automatically’ get me back to the settings later on.

On Sat, Sep 12, 2020 at 18:44 Alan - G4GNX  wrote:

> The KAT500 retains matched memories for each band/frequency per antenna.
>
> So yes, you have 3 solutions per band/frequency. It has quite a lot of
>
> memories. :-D
>
>
>
> 73,
>
>
>
> Alan. G4GNX
>
>
>
>
>
> -- Original Message --
>
> From: "w4sc" 
>
> To: "elecraft@mailman.qth.net" 
>
> Sent: 13/09/2020 00:38:08
>
> Subject: Re: [Elecraft] K1ZTE - KAT500
>
>
>
> >I have the KAT/KPA500 setup with the K3.  It works great when trained,
> tracking VFO.  I had only one antenna available per band at the time using
> the setup.  Currently the “shack” is undergoing a move and renovation.
>
> >
>
> >I will be back on with possibly as many as 3 antennas available on a
> single band.  I have looked for answer to the following question.
>
> >
>
> >Is the training saved per-BAND/ANTENNA combination tuning solution?..
> possibly resulting in 3 solutions per band.  If there is only one solution
> there are implications in switching to a different antenna in a band with
> multiple antenna choices.  In my case the future may hold a vertical,
> beam, and horizontal loop on 40M.
>
> >
>
> >Ben  W4SC
>
> >
>
> >
>
>
>
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-- 
73 de Ted Edwards, W3TB and GØPWW

and thinking about operating CW:
"Do today what others won't,
so you can do tomorrow what others can't."
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Re: [Elecraft] K1ZTE - KAT500

[Nr4c]

Yes but my experience with this always causes a “tune” cycle.  I have already 
taught my KAT500 my antennas so only need it to locate nearest saved solution. 

Sent from my iPhone
...nr4c. bill


> On Sep 12, 2020, at 5:21 PM, Dick Dievendorff  wrote:
> 
> Page 13 of the KAT500 owners manual describes an AH-4 connection between 
> Icom radios and the KAT500.
> 
> Does this work for you?
> 
> 73 de Dick, K6KR
> 
> 
> 
>> On Sep 12, 2020, at 14:06, Russell Domareck via Elecraft 
>>  wrote:
>> 
>> I own a KAT500 and KPA500 that I use with an IC 7300.  When in CW mode, the 
>> KAT500 can be activated by keying the IC 7300, no problem.  This allows the 
>> KAT500 to find a match with low power while the KPA500 is in standby mode.  
>> In SSB mode, there is still the need to activate the KAT500 for the match, 
>> however, neither keying the mike nor speaking into the mike activates the 
>> KAT500.  A press of the transmit button in the IC 7300 also did not activate 
>> the KAT500.  I find that I have to first switch to CW mode for the 
>> activation before switching to SSB so that the KAT500 is all set for KPA500 
>> operation.  Is what I am doing the only way to do this?  I have read related 
>> posts on this subject but they did not satisfactorily answer my question.
>> __
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Re: [Elecraft] K1ZTE - KAT500

[Nr4c]

You need RF to cause the amp to know what band and freq you are using. 
Keying then mic on SSB won’t generate RF until you speak. CW, AM, FM or RTTY 
will generate RF when keying the mic (or tap the paddles in CW) and will 
generate the RF to tickle the Amp and ATU. 

Sent from my iPhone
...nr4c. bill


> On Sep 12, 2020, at 5:06 PM, Russell Domareck via Elecraft 
>  wrote:
> 
> I own a KAT500 and KPA500 that I use with an IC 7300.  When in CW mode, the 
> KAT500 can be activated by keying the IC 7300, no problem.  This allows the 
> KAT500 to find a match with low power while the KPA500 is in standby mode.  
> In SSB mode, there is still the need to activate the KAT500 for the match, 
> however, neither keying the mike nor speaking into the mike activates the 
> KAT500.  A press of the transmit button in the IC 7300 also did not activate 
> the KAT500.  I find that I have to first switch to CW mode for the activation 
> before switching to SSB so that the KAT500 is all set for KPA500 operation.  
> Is what I am doing the only way to do this?  I have read related posts on 
> this subject but they did not satisfactorily answer my question.
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Re: [Elecraft] No Tx audio after WSJT upgrade

[Neil Zampella]

Actually ... WSJT-X only uses what windows tells it is available.   
After Windows updates its been found that Windows will scramble the
audio devices, especially if they are USB devices.

What has been found to work is to RENAME the device you use in the Sound
Control Panel.  Bring up the Sound Control Panel, find the USB adapter
normally used for sound input to WSJT-X under Speakers and double click
to open the properties.   On the first tab you can rename it to what you
want to use, such as WSJT-X Sound OUT.   Do the same with the microphone
device and rename to WSJT-X Sound IN.

Click the OK button, and then close the Sound Control Panel.   I'd do a
restart to make sure that Windows has saved that info.   Then open
WSJT-X and select them on the Audio setting tab.

Most of the users who have done this have not see the 'scrambled audio
device' issue again.

Neil, KN3ILZ

On 9/12/2020 9:22 AM, Rich wrote:

WJST-X does a very poor job of loading the current sound devices from
Windows when you run the program.   It appears to load whatever
existed in the Sound Panel when it was installed.

So use caution that what you see in the WJST-X audio window vs. what
actually exists in the Windows Sound Panel.

To me it appears to be more of WJST-X issue that a Windows issue

Maybe there is a way to fix this, but I do not know what it is.

Rich

On 9/12/2020 7:20 AM, Ian Kahn, NV4C wrote:

Joe,

Check your WSJT-X settings and ensure you still have the correct
sound card selected and that something didn't change your output
target/radio selection. Also, if you're running Windows, make sure
something else didn't change any of your sound card settings from
what you had prior to upgrading WSJT-X.

73 de,

Ian, NV4C

On 9/11/20 11:23 PM, W8JH wrote:

I was working FT8 tonight and decided to upgrade from WSJT 2.0 to
the latest
2.2.

Now I have no audio on transmit. All other functions work. Decodes,
band
change etc.

It puts the K3s in transmit but no audio. I have adjusted the Mic gain
without effect.

I double checked that WSJT has the K3s codec for transmit selected. 
Windoze
shows it working as well.

I’m totally stumped and wish I hadn’t upgraded now. Any ideas how to
proceed
?

73,



-
73,

Joe, W8JH

K3s, KPA 500, KAT 500 and  KX3 happy user.
--
Sent from: http://elecraft.365791.n2.nabble.com/
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Re: [Elecraft] K1ZTE - KAT500

[Alan - G4GNX]

The KAT500 retains matched memories for each band/frequency per antenna. 
So yes, you have 3 solutions per band/frequency. It has quite a lot of 
memories. :-D


73,

Alan. G4GNX


-- Original Message --
From: "w4sc" 
To: "elecraft@mailman.qth.net" 
Sent: 13/09/2020 00:38:08
Subject: Re: [Elecraft] K1ZTE - KAT500


I have the KAT/KPA500 setup with the K3.  It works great when trained, tracking 
VFO.  I had only one antenna available per band at the time using the setup.  
Currently the “shack” is undergoing a move and renovation.

I will be back on with possibly as many as 3 antennas available on a single 
band.  I have looked for answer to the following question.

Is the training saved per-BAND/ANTENNA combination tuning solution?.. possibly 
resulting in 3 solutions per band.  If there is only one solution there are 
implications in switching to a different antenna in a band with multiple 
antenna choices.  In my case the future may hold a vertical,  beam, and 
horizontal loop on 40M.

Ben  W4SC




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Re: [Elecraft] K1ZTE - KAT500

[w4sc]

I have the KAT/KPA500 setup with the K3.  It works great when trained, tracking 
VFO.  I had only one antenna available per band at the time using the setup.  
Currently the “shack” is undergoing a move and renovation.

I will be back on with possibly as many as 3 antennas available on a single 
band.  I have looked for answer to the following question.

Is the training saved per-BAND/ANTENNA combination tuning solution?.. possibly 
resulting in 3 solutions per band.  If there is only one solution there are 
implications in switching to a different antenna in a band with multiple 
antenna choices.  In my case the future may hold a vertical,  beam, and 
horizontal loop on 40M.

Ben  W4SC



Sent from Mail for Windows 10

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Re: [Elecraft] K1ZTE - KAT500

[KENT TRIMBLE]

A further consideration has to do with what kind of AMU you are using, 
whether electronic or mechanical (for want of a better description).


Once a match is memorized, electronic AMUs set their solutions nearly 
instantly.  High SWR levels exist only for milliseconds (if that).


But mechanical AMUs (whether automatic or manual) require TIME in order 
for the capacitor(s) and inductor to find their proper matching 
positions.  Even when a match has been previously memorized, it may take 
several seconds for the inductor wheel to traverse the roller coil and 
the capacitor(s) to rotate.


That's why one needs to pay attention to the SWR levels impacting both 
the AMU and the transceiver.


73,

Kent  K9ZTV


On 9/12/2020 6:03 PM, KENT TRIMBLE wrote:

Alan is right, but it depends on which "good book" one is consulting!

We have to be careful about transceiver power levels when tuning an 
external AMU, for the sake of the /transceiver /as well as the AMU.


Your AMU may be able to tolerate 100 watts during the tuning process, 
but your transceiver may not.  Unless the transceiver automatically 
folds back its output in the presence of high SWR levels, one risks 
damaging the transceiver's PA transistors. While many modern rigs do 
so, others, especially older rigs often used by new licensees, do not.


For example, when seeing an SWR above 3:1, my FT-991A reduces its CW 
output from 100 to 10 watts while at the same time flashing "HIGH SWR" 
in red letters.  The rig may be successfully protecting itself, but 
why risk stressing components if it's not necessary? That's why I 
prefer switching the transceiver to AM at 25 watts when tuning an 
external AMU.


73,

Kent  K9ZTV



On 9/12/2020 5:16 PM, Alan - G4GNX wrote:
Although it's preferable to have at least 20W to tune, the good book 
says that anything between 7 and 100 watts is OK.


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Re: [Elecraft] K1ZTE - KAT500

[Alan - G4GNX]

I was quoting from the KAT500 owners manual and only the min and max 
power that the KAT500 will tolerate.


As I just posted, there's a cable made which allows you to use the 
external tuner function of the IC-7300, forcing it to output low power 
for tuning, but without connecting the IC-7300 to the tuner, except for 
the RF connection. That way you know that the IC-7300 is only outputting 
its intended tuning power and will protect itself.


73,

Alan. G4GNX


-- Original Message --
From: "KENT TRIMBLE" 
To: "elecraft@mailman.qth.net" 
Sent: 13/09/2020 00:03:34
Subject: Re: [Elecraft] K1ZTE - KAT500


Alan is right, but it depends on which "good book" one is consulting!

We have to be careful about transceiver power levels when tuning an external 
AMU, for the sake of the /transceiver /as well as the AMU.

Your AMU may be able to tolerate 100 watts during the tuning process, but your 
transceiver may not.  Unless the transceiver automatically folds back its 
output in the presence of high SWR levels, one risks damaging the transceiver's 
PA transistors.  While many modern rigs do so, others, especially older rigs 
often used by new licensees, do not.

For example, when seeing an SWR above 3:1, my FT-991A reduces its CW output from 100 to 
10 watts while at the same time flashing "HIGH SWR" in red letters.  The rig 
may be successfully protecting itself, but why risk stressing components if it's not 
necessary?  That's why I prefer switching the transceiver to AM at 25 watts when tuning 
an external AMU.

73,

Kent  K9ZTV



On 9/12/2020 5:16 PM, Alan - G4GNX wrote:

Although it's preferable to have at least 20W to tune, the good book says that 
anything between 7 and 100 watts is OK.


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Re: [Elecraft] K1ZTE - KAT500

[KENT TRIMBLE]

Alan is right, but it depends on which "good book" one is consulting!

We have to be careful about transceiver power levels when tuning an 
external AMU, for the sake of the /transceiver /as well as the AMU.


Your AMU may be able to tolerate 100 watts during the tuning process, 
but your transceiver may not.  Unless the transceiver automatically 
folds back its output in the presence of high SWR levels, one risks 
damaging the transceiver's PA transistors.  While many modern rigs do 
so, others, especially older rigs often used by new licensees, do not.


For example, when seeing an SWR above 3:1, my FT-991A reduces its CW 
output from 100 to 10 watts while at the same time flashing "HIGH SWR" 
in red letters.  The rig may be successfully protecting itself, but why 
risk stressing components if it's not necessary?  That's why I prefer 
switching the transceiver to AM at 25 watts when tuning an external AMU.


73,

Kent  K9ZTV



On 9/12/2020 5:16 PM, Alan - G4GNX wrote:
Although it's preferable to have at least 20W to tune, the good book 
says that anything between 7 and 100 watts is OK.


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Re: [Elecraft] K1ZTE - KAT500

[Alan - G4GNX]

From what the OP wrote, I don't think he's using the Tune button to 

activate the KAT500.

A 3rd party sells a cable that plugs into the AH-4 socket on the back of 
the IC-7300, which allows you to make the IC-7300 enter Tune mode, by 
pressing the simple button on the end of the cable. It would of course 
be possible to make your own.


73,

Alan. G4GNX


-- Original Message --
From: "w4sc" 
To: "elecraft@mailman.qth.net" 
Sent: 12/09/2020 23:06:37
Subject: Re: [Elecraft] K1ZTE - KAT500


There may be a clue here

https://kg3v.com/2019/03/03/cant-use-tune-button-on-ic-7300-with-kat-500-tuner/






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Re: [Elecraft] K1ZTE - KAT500

[Alan - G4GNX]

Yes. You would normally 'train' the KAT500 in segments over each band 
for each antenna. This is done in Auto mode. The recommended segments 
are listed in the back of the KAT500 manual. Each match setting is 
stored in its own memory.
You would then leave the KAT500 in Manual mode and each time you 
transmit, it should detect the band/frequency and switch to the 
appropriate memory.


Memory settings are retained after power down.

73,

Alan. G4GNX


-- Original Message --
From: "Ted Edwards W3TB" 
To: "KENT TRIMBLE" 
Cc: "elecraft@mailman.qth.net" 
Sent: 12/09/2020 23:22:48
Subject: Re: [Elecraft] K1ZTE - KAT500


Related question:  Should the KAT-500 hold memorized settings after
shutting down to ready for use another time?




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Re: [Elecraft] [K4] Shipping??

[Jim Brown]

On 9/11/2020 8:30 PM, Augie "Gus" Hansen wrote:
Have you been able to get home yet? What's the status of your home and 
antennas?


Got back a few days ago, only damage is to floor under refrigerator that 
had been without power for 3 wks. House, shack, antennas all fine. No 
power, water, or internet, so we're in a rental townhouse for a while.


73, Jim K9YC

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Re: [Elecraft] K1ZTE - KAT500

[Ted Edwards W3TB]

Related question:  Should the KAT-500 hold memorized settings after
shutting down to ready for use another time?

On Sat, Sep 12, 2020 at 17:11 KENT TRIMBLE  wrote:

> With nearly all modern transceivers nowadays, the trick is to set the
>
> power on AM to 25 watts (which is the most you should ever run a 100
>
> watt transceiver on AM), and use AM to tune your KAT500.  This puts a
>
> carrier into the tuner at an acceptable low power.
>
>
>
> You can tune it in CW mode, but that requires turning the transceiver's
>
> power output down, and then turning it back up.  By using AM the power
>
> is already set at 25 and doesn't need further adjusting.  Some ops like
>
> to tune in FM mode, but I prefer AM.
>
>
>
> When the KAT500 has finished its routine, switch back to SSB at 100
>
> watts (or whatever you want).
>
>
>
> 73,
>
>
>
> Kent  K9ZTV
>
>
>
>
>
>
>
> On 9/12/2020 4:04 PM, Russell Domareck via Elecraft wrote:
>
> > Is what I am doing the only way to do this?  I have read related posts
> on this subject but they did not satisfactorily answer my question.
>
> > __
>
> > Elecraft mailing list
>
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>
> >
>
>
>
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> Message delivered to w3tb@gmail.com

-- 
73 de Ted Edwards, W3TB and GØPWW

and thinking about operating CW:
"Do today what others won't,
so you can do tomorrow what others can't."
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Re: [Elecraft] K1ZTE - KAT500

[Alan - G4GNX]

Although it's preferable to have at least 20W to tune, the good book 
says that anything between 7 and 100 watts is OK. I guess you're 
providing that in CW mode. Have you 'trained' the KAT500 for the entire 
band/s you want to use? If you do that in Auto mode, then switch to 
Manual mode, the KAT500 should see RF from the IC-7300 and switch to the 
'trained' and matched frequency, but you will have to speak into the mic 
to produce some RF. Pressing the PTT or Transmit button won't do that, 
unless you have a really high background noise which the mic picks up.
Are you sure that the IC-7300 internal tuner is switched out? I haven't 
messed with our club's IC-7300 for some time (pandemic issues) but I 
previously found that the internal tuner was not very good and would not 
match anything over 2:1 and even with it switched out the rig would 
drastically cut its power back if it thought the SWR was high. It may be 
a chicken and egg situation where the KAT500 has not yet matched, so the 
IC-7300 sees that mismatch and won't produce enough power to make the 
KAT500 activate.


You would probably find it would work as you wish if you setup an AH-4 
cable between the rig and tuner. Page 15 of the KAT500 shows how to do 
this.


73,

Alan. G4GNX


-- Original Message --
From: "Russell Domareck via Elecraft" 
To: "elecraft@mailman.qth.net" 
Sent: 12/09/2020 22:04:29
Subject: [Elecraft] K1ZTE - KAT500


I own a KAT500 and KPA500 that I use with an IC 7300.  When in CW mode, the 
KAT500 can be activated by keying the IC 7300, no problem.  This allows the 
KAT500 to find a match with low power while the KPA500 is in standby mode.  In 
SSB mode, there is still the need to activate the KAT500 for the match, 
however, neither keying the mike nor speaking into the mike activates the 
KAT500.  A press of the transmit button in the IC 7300 also did not activate 
the KAT500.  I find that I have to first switch to CW mode for the activation 
before switching to SSB so that the KAT500 is all set for KPA500 operation.  Is 
what I am doing the only way to do this?  I have read related posts on this 
subject but they did not satisfactorily answer my question.



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Re: [Elecraft] K1ZTE - KAT500

[KENT TRIMBLE]

With nearly all modern transceivers nowadays, the trick is to set the 
power on AM to 25 watts (which is the most you should ever run a 100 
watt transceiver on AM), and use AM to tune your KAT500.  This puts a 
carrier into the tuner at an acceptable low power.


You can tune it in CW mode, but that requires turning the transceiver's 
power output down, and then turning it back up.  By using AM the power 
is already set at 25 and doesn't need further adjusting.  Some ops like 
to tune in FM mode, but I prefer AM.


When the KAT500 has finished its routine, switch back to SSB at 100 
watts (or whatever you want).


73,

Kent  K9ZTV



On 9/12/2020 4:04 PM, Russell Domareck via Elecraft wrote:

Is what I am doing the only way to do this?  I have read related posts on this 
subject but they did not satisfactorily answer my question.
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Re: [Elecraft] K1ZTE - KAT500

[w4sc]

There may be a clue here

https://kg3v.com/2019/03/03/cant-use-tune-button-on-ic-7300-with-kat-500-tuner/



Sent from Mail for Windows 10

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Re: [Elecraft] K1ZTE - KAT500

[JK Hooper via Elecraft]

Russell, 

I have the same experience with my 7300 exactly, needing to shift to CW mode to 
match the KAT500.   It’s at the point where it’s just what I do.  

Dick, 

I have the cable for connecting the 7300 to an external tuner, such as the 
AH-4, and I found that it did work fine for initiating a tune.  But what I want 
is to use the stored settings in the KAT500 rather than initiate a tune each 
time, so I have KAT500 in “MAN” setting.  The CW key transmission is what I 
need to use to activate the right pre-loaded setting for the frequency in the 
KAT500.   

I did find that the 12 volt connector part of the I-think-it-was LDG cable was 
so sloppy that it would not stay in the KAT500.   So I just don’t use it at 
all. 

73
Hoop
K9QJS 




On Sep 12, 2020, at 2:18 PM, Dick Dievendorff  wrote:

Page 13 of the KAT500 owners manual describes an AH-4 connection between Icom 
radios and the KAT500.

Does this work for you?

73 de Dick, K6KR



> On Sep 12, 2020, at 14:06, Russell Domareck via Elecraft 
>  wrote:
> 
> I own a KAT500 and KPA500 that I use with an IC 7300.  When in CW mode, the 
> KAT500 can be activated by keying the IC 7300, no problem.  This allows the 
> KAT500 to find a match with low power while the KPA500 is in standby mode.  
> In SSB mode, there is still the need to activate the KAT500 for the match, 
> however, neither keying the mike nor speaking into the mike activates the 
> KAT500.  A press of the transmit button in the IC 7300 also did not activate 
> the KAT500.  I find that I have to first switch to CW mode for the activation 
> before switching to SSB so that the KAT500 is all set for KPA500 operation.  
> Is what I am doing the only way to do this?  I have read related posts on 
> this subject but they did not satisfactorily answer my question.
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Re: [Elecraft] K1ZTE - KAT500

[Don Wilhelm]

It takes 20+ watts to tune the KAT500.
I have no idea of how to set up the IC7300 to do that when in SSB mode. 
You will have to ask on the Icom forums.


73,
Don W3FPR

On 9/12/2020 5:04 PM, Russell Domareck via Elecraft wrote:

I own a KAT500 and KPA500 that I use with an IC 7300.  When in CW mode, the 
KAT500 can be activated by keying the IC 7300, no problem.  This allows the 
KAT500 to find a match with low power while the KPA500 is in standby mode.  In 
SSB mode, there is still the need to activate the KAT500 for the match, 
however, neither keying the mike nor speaking into the mike activates the 
KAT500.  A press of the transmit button in the IC 7300 also did not activate 
the KAT500.  I find that I have to first switch to CW mode for the activation 
before switching to SSB so that the KAT500 is all set for KPA500 operation.  Is 
what I am doing the only way to do this?  I have read related posts on this 
subject but they did not satisfactorily answer my question.

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Re: [Elecraft] K1ZTE - KAT500

[Dick Dievendorff]

Page 13 of the KAT500 owners manual describes an AH-4 connection between Icom 
radios and the KAT500.

Does this work for you?

73 de Dick, K6KR



> On Sep 12, 2020, at 14:06, Russell Domareck via Elecraft 
>  wrote:
> 
> I own a KAT500 and KPA500 that I use with an IC 7300.  When in CW mode, the 
> KAT500 can be activated by keying the IC 7300, no problem.  This allows the 
> KAT500 to find a match with low power while the KPA500 is in standby mode.  
> In SSB mode, there is still the need to activate the KAT500 for the match, 
> however, neither keying the mike nor speaking into the mike activates the 
> KAT500.  A press of the transmit button in the IC 7300 also did not activate 
> the KAT500.  I find that I have to first switch to CW mode for the activation 
> before switching to SSB so that the KAT500 is all set for KPA500 operation.  
> Is what I am doing the only way to do this?  I have read related posts on 
> this subject but they did not satisfactorily answer my question.
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[Elecraft] K1ZTE - KAT500

[Russell Domareck via Elecraft]

I own a KAT500 and KPA500 that I use with an IC 7300.  When in CW mode, the 
KAT500 can be activated by keying the IC 7300, no problem.  This allows the 
KAT500 to find a match with low power while the KPA500 is in standby mode.  In 
SSB mode, there is still the need to activate the KAT500 for the match, 
however, neither keying the mike nor speaking into the mike activates the 
KAT500.  A press of the transmit button in the IC 7300 also did not activate 
the KAT500.  I find that I have to first switch to CW mode for the activation 
before switching to SSB so that the KAT500 is all set for KPA500 operation.  Is 
what I am doing the only way to do this?  I have read related posts on this 
subject but they did not satisfactorily answer my question.
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[Elecraft] WTT: KX3 for K3 or K3S

[Dave Erickson]

Hey all,

I have a mint condition KX3 with ALL options including the 2m 
module.Also has the Kx32 Ultimate Heatsink KX3 which allows for 
continuous 15W transmit.


Serial is 111**

What I want is a K3/K3S with tuner and 100w PA, the other options are 
flexible.


Let me know what you've got and maybe we can work something out. I could 
add a few bucks for the right deal.


Thanks, maybe contact me directly to keep the list clean.

--
Dave Erickson
k0dom
73

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Re: [Elecraft] KX3 SWR meter accuracy on 50 MHz?

[Nr4c]

Well, it depends on the “Dummy” load.  Have you swept the load with a good 
spectrum analyzer or VNA?  It may not be 50 ohms at 50 MHz



Sent from my iPhone
...nr4c. bill


> On Sep 12, 2020, at 11:51 AM, Drew Arnett  wrote:
> 
> After getting my KX3 back from repair (before my next planned contest
> operation, thanks!), I ran some measurements to both see how great the
> repairs were and to get a new baseline for future measurements.  TX
> efficiency problem was gone.
> 
> However, I'm left to wonder about the accuracy of the internal SWR
> meter for 50 MHz.  Using a microwave dummy load of adequate power
> rating and just a coaxial adapter, I measured the following:
> 
> 14 MHz @ 1 W setting
> VSWR 1.0 to 1 (per KX3)
> 
> 28 MHz @ 1 W setting
> VSWR 1.0 to 1
> 
> 50 MHz @ 1 W setting
> VSWR 1.5 to 1
> 
> 50 MHz @ 4 W setting
> VSWR 1.6 to 1
> 
> Not horrible.  Not great.
> 
> It's fine if it's not as accurate on 50 MHz.  I just want to know if
> this is normal.  Has anyone else looked at that and can share what
> they see?
> 
> Thanks and best regards,
> 
> Drew
> n7da
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[Elecraft] FS K3S with P3 SOLD

[Ron Durie]

THE K3S AND P3 are sold.  Thanks.  73's

Ron Durie
WB4OOA
Elecraft K-Line
704-843-3681
wb4...@gmail.com 



-Original Message-
From: Ron Durie [mailto:wb4...@gmail.com] 
Sent: Friday, September 11, 2020 12:29 PM
To: 'elecraft@mailman.qth.net' 
Subject: FS K3S with P3

My K3S  SN:10684  Has every option installed, except the 2meter module.  It
has also been upgraded by Elecraft for improved Transmit IMD.  
Original owner; non-smoker; Latest Firmware; and in like new condition.  No
scratches or even smudges.  Even the knobs are new.  
Includes connecting cables; manuals; and the original Elecraft K3S shipping
box with foam support.  
A picture of this rig is on my QRZ page.  This is the 4th K3 series that I
have built.  

Also, my P3 SN:2710  With SVGA option & Wattmeter option.  Original owner
and also in like new condition.  
In my opinion this is the most accurate spectrum monitor on the market
today.  
All Connector Pins (on both units) have been treated with Caig DeOxit
solution for reliable performance. 

Total package price:  $3395.00 shipped to CONUS.  
My Email:  WB4OOA at gmail.com

Ron Durie
WB4OOA



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[Elecraft] Fwd: K4 Predistortion planned? timetable?

[Robert Sands]

Is this topic allowed? Original post did not come  through.

-- Forwarded message -
From: Robert Sands 
Date: Thu, Sep 10, 2020 at 10:57 AM
Subject: K4 Predistortion planned? timetable?
To: Elecraft Discussion List 


Is the processor in the K4 fast or big enough to handle the demand of the
anticipated predistortion algorithm? Is this predistortion algorithm a
proprietary matter or is it constructed de novo from existing knowledge?
Any information on what is planned would be appreciated. Have not seen much
other than "later". Big attraction to me.
Robert
K7VO
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Re: [Elecraft] KX3 buzz if power up on transverter band

[Drew Arnett]

Anybody have a chance to try this?  Would be useful to know if someone
else cannot.  Would be equally useful to know if someone can.  Still
waiting to hear back from Elecraft.

Thanks,

Drew
n7da

On Fri, Aug 21, 2020 at 3:22 PM Drew Arnett  wrote:
>
> Oscilloscope "screenshot" of the offending waveform:
>
> https://drive.google.com/drive/folders/1-g9Met098lhncAcMtAAOvxWFDjf0NU_w?usp=sharing
>
> Can anyone try to reproduce this to rule out or confirm my suspicion
> it might be caused by firmware bug?
>
> You can imagine how fast I knocked my headphones off!  :-O  :-)
>
> Thanks and best regards,
>
> Drew
> n7da
>
> On Wed, Aug 19, 2020 at 2:49 PM Drew Arnett  wrote:
> >
> > Hi,
> >
> > Weird problem.  Anyone else try this and do or don't see this?
> >
> > Just got my KX3 back from repair.  This included an upgrade to the
> > latest firmware.  (Makes sense.  Requirement for production test.  I
> > hadn't upgraded to the very latest, because I had no need for the
> > latest improvements.)
> >
> > Set the radio back up for 10368 to 50 MHz transverter use on XVTR1
> > band.  Now, if I power up the radio when it was shut down on the XVTR
> > band, there is a crazy loud buzz on the audio output (and
> > corresponding response of the S meter.)  If I switch to any other
> > non-XVTR band and then power up, no problem even if switching then to
> > the XVTR band.
> >
> > FW is now 2.90/1.52I got the radio back just before the 10 GHz
> > contest, so only made minimal changes to settings from the cleared
> > state it came back in.  Changes made:
> > AFX mode off (was delay)
> > ATU bypass (can't remember if it came back this way or not.  XVTR is
> > good 50 ohm load.)
> > BAT CHG off (was not inst)
> > BKLIGHT off (was on)
> > MIC BIAS off (I think came back on; used dynamic mic during contest)
> > MIC BTN Ptt (was up/down)
> > TX DLY 10 (was 5.  abundance of caution as 5 is more than enough for
> > the 10 GHz rig I'm running)
> > XV1 on
> > XV1 RF 10368
> > XV1 IF 50
> > XV1 PWR 0.1
> > XV1 OFS (set in field) 1.20
> > XV1 ADR trn1
> > set the clock.  :-)
> > turned on the hidden in the menus CW-in-SSB feature
> >
> > I know I turned on or off a couple of front panel things as they left
> > it.  Don't remember.  Stuff like vox, pre, nr or nb.  Definitely
> > adjusted mic gain and compression and keyer speed.  :-)
> >
> > RX ISO changed to on during the contest, but problem occurs with it on or 
> > off
> >
> > What does the headphone jack output look like?  Power up in bad state.
> > Set volume control to 20.  With no load other than 10X scope probe,
> > the AC component is identical for left and right.  Tip has about 0 V
> > DC offset.  Ring has about + 0.5 V DC offset.  AC component looks like
> > a the differential of a square wave.  Peak to peak amplitude is 220
> > mV.  (This follows volume control.  Didn't check to see if DC offset
> > follows volume control.)  12.2 millisecond repetition rate for
> > positive and negative pulses.  Negative pulse leads positive pulse by
> > 2.2 ms, so 10 ms from positive pulse to negative.  Very small AC
> > ripple on that with a period of about 0.4 ms.
> >
> > I was very happy to find a sequence to avoid the problem (as described
> > above.)  To trouble shoot, I tried to rule out a number of things.
> > Unplugged ALL cables from the KX3.  That did not resolve.  Tried
> > external 12.4 V (battery on hand) and internal battery removed.  Tried
> > internal battery (charged) and nothing plugged in.  No dice.
> >
> > Given that it's just back from repair, that sequencing gets it in a
> > bad state, FW was upgraded to a new version, and audio path goes
> > through FW, seems reasonable to ask if this is a known FW issue or if
> > someone can try to reproduce this.
> >
> > Hoping to figure this out before the Sept VHF, the Sept 10 GHz contest
> > weekend, and of course the HF contests coming up later this fall.  :-)
> >  With my workaround, I was able to participate in the Aug 10 GHz
> > weekend without interruption.  I ran a W1GHZ XVTR barefoot (+5 dBm
> > Pout) for best DX of 379 km.  How much fun can you have with a KX3?
> > Lots!  :-)
> >
> > Thanks and best regards,
> >
> > Drew
> > n7da
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[Elecraft] KX3 SWR meter accuracy on 50 MHz?

[Drew Arnett]

After getting my KX3 back from repair (before my next planned contest
operation, thanks!), I ran some measurements to both see how great the
repairs were and to get a new baseline for future measurements.  TX
efficiency problem was gone.

However, I'm left to wonder about the accuracy of the internal SWR
meter for 50 MHz.  Using a microwave dummy load of adequate power
rating and just a coaxial adapter, I measured the following:

14 MHz @ 1 W setting
VSWR 1.0 to 1 (per KX3)

28 MHz @ 1 W setting
VSWR 1.0 to 1

50 MHz @ 1 W setting
VSWR 1.5 to 1

50 MHz @ 4 W setting
VSWR 1.6 to 1

Not horrible.  Not great.

It's fine if it's not as accurate on 50 MHz.  I just want to know if
this is normal.  Has anyone else looked at that and can share what
they see?

Thanks and best regards,

Drew
n7da
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Re: [Elecraft] KX-3 TX current draw?

[Drew Arnett]

Just to follow up.  When I talked to support, they recommended sending
in for service.

After getting the rig back, I've only used it for IF at 100 mW on 50
MHz with transverter.  And had a weird loud audio buzz problem.  See
separate email describing that.  Have reported to Elecraft; still
waiting for a response.  Assuming the buzz problem is unrelated,
here's a set of new measurements made this morning to show post repair
performance for TX.

ATU bypassed.  Bench DC supply.  Excellent dummy load.  No coax, just
a couple of coax adapters between rig and dummy load.

14 MHz @ 1 W setting
13.6 V RX (per KX3)
13.4 V TX (per KX3)
0.660 A TX (per KX3)
VSWR 1.0 (per KX3)

28 MHz @ 1 W setting
13.6 V RX
13.4 V TX
0.765 A TX
VSWR 1.0

50 MHz @ 1 W setting
13.6 V RX
13.2 V TX
1.040 A TX
VSWR 1.5

50 MHz @ 4 W setting
13.6 V RX
13.0 V TX
1.710 A TX
VSWR 1.6

That looks MUCH better.  Efficiency on 50 MHz @ 4 W is > 18% and on
par with the one other reported measurement.

Huge thanks to Elecraft for getting the repair done before my next
major contesting event, the first weekend of the 10 GHz and Up.  (Hmm.
Some HF contesting coming up soon.  Amazing how many different kinds
of fun you can have with a KX3!)

I am a bit disappointed with the SWR meter on 50 MHz.  Makes me wonder
how to operate safely on 50 MHz without an external meter or when
using the internal ATU.

FYI if anyone else runs into this issue, the repair report:
 Repair(s) performed:
 Replaced Q6-Q7 (E850047)
 Current draw at 2.90 amps or below is acceptable.
 -
 Updates performed:
 Control panel:
 Updated firmware.
 Updated Q9 (part change)
 RF Board:
 Replaced C1U and C1P (value change)

Best regards,

Drew
n7da

On Sat, May 16, 2020 at 5:25 PM Drew Arnett  wrote:
>
> To follow up on Victor's point, did some more measurements this morning.
>
> Setup:
> KX-3 minimal adapters to 40 dB directional coupler to load
> terminated unused port of coupler
> measured port through 3 ft patch to Kanga US AD8307 RF power meter
>
> I have good calibration data for the power meter, but for the purpose
> at hand, I won't correct the meter readings.  60 on the scale is about
> -20 dBm.  Every 10 on the scale is actually 10.7 dB.  Good enough.
>
> Internal tuner bypassed.
>
> Measurements:
>
> Note:  RX current in RX was between about .15 and .19 A for all 3 bands.
>
> 14 MHz @ 1 W setting
> 13.7 V RX (per KX3)
> 13.4 V TX (per KX3)
> 1.15 A TX (per KX3)
> VSWR 1.3 (per KX3)
> FWD 67 (on power meter display, very close to expected)
> REV 30 (on power meter display)
> --> return loss approx 37 dB
>
> 28 MHz @ 1 W setting
> 13.7 V RX
> 13.4 V TX
> 1.15 A TX
> 1.3 VSWR
> FWD 67
> REV 30
> --> return loss approx 37 dB
>
> 50 MHz @ 1 W setting
> 13.7 V RX
> 12.9 V TX
> 2.9 A TX
> 1.6 VSWR
> FWD 71
> REV 35
> --> return loss approx 36 dB
>
> Hmm.  So, I'm seeing 3% or less efficiency.  Only one respondent on my
> query about TX current draw, and he was getting 15%+ efficiency.  No
> wonder my PA temp shoots up.
>
> Thanks,
>
> Drew
> n7da
>
> On Sat, May 9, 2020 at 11:25 AM Drew Arnett  wrote:
> >
> > Good point, Victor.  And why I included that SWR reading.  Other bands
> > read fine.  I have high confidence in the load and adapter (tried
> > swapping both just in case).  I could measure the load and adapter the
> > next time I'm in the lab at work if I want to be absolutely thorough,
> > but it is a microwave load and just adapting from BNC to N (no coax).
> >
> > SWR looks fine on other bands.
> >
> > Thanks,
> >
> > Drew
> > n7da
> >
> > On Sat, May 9, 2020 at 4:57 AM Victor Rosenthal  wrote:
> > >
> > > I think 1.6:1 is high for that kind of dummy load, if it's in good shape. 
> > > Should be close to 1:1.
> > > Anyway, you can't really say there is a problem unless you have a better 
> > > match. Current draw is sensitive to mismatch.
> > > --
> > > Vic
> > >
> > > On May 9, 2020 2:32:15 AM GMT+03:00, Drew Arnett  
> > > wrote:
> > >>
> > >> Walter,
> > >>
> > >> 50 MHz TX constant 4 W carrier measures 13.53 V on DMM (outside the DC
> > >> power plug), 13.3 V on KX3 meter, 2.9 A on KX3 meter and 1.6 to 1 VSWR
> > >> on KX3 meter.  Microwave dummy load with BNC to N adapter.
> > >>
> > >> I didn't measure all of this when the rig was new, so have no baseline
> > >> to know what is normal.  :-(
> > >>
> > >> Thanks,
> > >>
> > >> Drew
> > >> n7da
> > >>
> > >> On Fri, May 8, 2020 at 11:19 PM Drew Arnett  
> > >> wrote:
> > >>>
> > >>>
> > >>>  What do you see for current draw on the KX-3?  Manual says 1 to 2 A 
> > >>> typical.
> > >>>
> > >>>  I'm seeing 3 A at less than full power on one band.  Yikes!  Makes me
> > >>>  wonder if the repair shop is open?  Elecraft website says hunkered
> > >>>  down and mostly work from home.
> > >>>
> > >>>  Thanks and best regards,
> > >>>
> > >>>  Drew
> > >>>  n7da
> > >>
> > >> 
> > >> Elecraft mailing list
> > >> Home: 

[Elecraft] Subtractive noise reduction

[John Kountz]

Folks,
This technique is integral to almost any disc record restoration software.  It 
is used most often to remove scratches and related damage from disc recordings. 
 Basically it consists of sampling the unrecorded lead in or 'quiet' interludes 
on the disc to provide a spectral profile of the noise to be dealt with, 
inverting that profile using it as a 'look ahead' filter  through which 
subsequent audio engraved on the disc is passed.  It is entirely conceivable 
that a similar technique could apply dynamically to material off the air 
proceeding the incoming 'signal' and applied as that 'signal' is received.  
Just another subroutine.
73,
John Kountz WO1S, T6EE

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Re: [Elecraft] No Tx audio after WSJT upgrade

[Rich]

WJST-X does a very poor job of loading the current sound devices from 
Windows when you run the program.   It appears to load whatever existed 
in the Sound Panel when it was installed.


So use caution that what you see in the WJST-X audio window vs. what 
actually exists in the Windows Sound Panel.


To me it appears to be more of WJST-X issue that a Windows issue

Maybe there is a way to fix this, but I do not know what it is.

Rich

On 9/12/2020 7:20 AM, Ian Kahn, NV4C wrote:

Joe,

Check your WSJT-X settings and ensure you still have the correct sound 
card selected and that something didn't change your output 
target/radio selection. Also, if you're running Windows, make sure 
something else didn't change any of your sound card settings from what 
you had prior to upgrading WSJT-X.


73 de,

Ian, NV4C

On 9/11/20 11:23 PM, W8JH wrote:
I was working FT8 tonight and decided to upgrade from WSJT 2.0 to the 
latest

2.2.

Now I have no audio on transmit. All other functions work. Decodes, band
change etc.

It puts the K3s in transmit but no audio. I have adjusted the Mic gain
without effect.

I double checked that WSJT has the K3s codec for transmit selected.  
Windoze

shows it working as well.

I’m totally stumped and wish I hadn’t upgraded now. Any ideas how to 
proceed

?

73,



-
73,

Joe, W8JH

K3s, KPA 500, KAT 500 and  KX3 happy user.
--
Sent from: http://elecraft.365791.n2.nabble.com/
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Re: [Elecraft] No Tx audio after WSJT upgrade

[Ian Kahn, NV4C]

Joe,

Check your WSJT-X settings and ensure you still have the correct sound 
card selected and that something didn't change your output target/radio 
selection. Also, if you're running Windows, make sure something else 
didn't change any of your sound card settings from what you had prior to 
upgrading WSJT-X.


73 de,

Ian, NV4C

On 9/11/20 11:23 PM, W8JH wrote:

I was working FT8 tonight and decided to upgrade from WSJT 2.0 to the latest
2.2.

Now I have no audio on transmit. All other functions work. Decodes, band
change etc.

It puts the K3s in transmit but no audio. I have adjusted the Mic gain
without effect.

I double checked that WSJT has the K3s codec for transmit selected.  Windoze
shows it working as well.

I’m totally stumped and wish I hadn’t upgraded now. Any ideas how to proceed
?

73,



-
73,

Joe, W8JH

K3s, KPA 500, KAT 500 and  KX3 happy user.
--
Sent from: http://elecraft.365791.n2.nabble.com/
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