Re: [Elecraft] KX3 Rx Equaliser ON/OFF

[Walter Underwood]

DATA A mode is USB with RX EQ, TX EQ, and compression turned off. 

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Mar 18, 2019, at 9:00 PM, Hans J Smit  wrote:
> 
> Having set Rx Equaliser desired settings on the KX3, is there any way to 
> switch to "flat" & back during operation?
> Hans VK5YX
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[Elecraft] KX3 Rx Equaliser ON/OFF

[Hans J Smit]

Having set Rx Equaliser desired settings on the KX3, is there any way to 
switch to "flat" & back during operation?

Hans VK5YX
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Re: [Elecraft] shipping KPA1500?

[Torrey Mitchell]

>From Des Moines UPS ground shipping ~ $50 each way.  Elecraft covers the
excess insurance...at least for me on a warranty repair.

73 Torrey N9PY

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of j...@kk9a.com
Sent: Monday, March 18, 2019 8/20:08 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] shipping KPA1500?

There is no simple answer however it is easy to get the shipping price on
the USPS website by entering the to and from zipcodes, the box size, weight
and insured value.

John KK9A

Doug Renwick ve5ra wrote 

I need to re-word my question. When returning a KPA 1500 for repair using
USPS, how much is it costing?

Doug

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Re: [Elecraft] Remote On/Off KPA-1500

[Dave]

Thanks Dick.

Dave wo2x

Sent from my iPad

> On Mar 18, 2019, at 11:27 PM, Dick Dievendorff  wrote:
> 
> The programming reference has an ^os command to do this.  The KPA1500 Utility 
> Operate tab and KPA1500 Remote programs use this command.
> 
> 73 de Dick, K6KR
> 
>> On Mar 18, 2019, at 19:43, Dave  wrote:
>> 
>> Also, is there an easy way to also toggle the amp between operate and 
>> standby? Would be nice to write an app for a Smartphone, either Apple or 
>> Android (I carry both).
>> 
>> Dave wo2x
>> 
>> Sent from my iPad
>> 
>>> On Mar 18, 2019, at 10:38 PM, Jorge Diez - CX6VM  
>>> wrote:
>>> 
>>> hello
>>> 
>>> what are the diferent ways to turn KPA1500´s on/off remotely?
>>> 
>>> Is there any way to turn it on/off alone, with no need to turn on/off the
>>> K3?
>>> 
>>> For example i want to turn on K3, but want to have KPA1500 off, is there
>>> any way to do that?
>>> 
>>> thanks,
>>> Jorge
>>> CX6VM/CW5W
>>> 
>>> 
>>> Libre
>>> de virus. www.avast.com
>>> 
>>> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>>> 
>>> El jue., 14 mar. 2019 a las 22:08, Dick Dievendorff ()
>>> escribió:
>>> 
 Some do this with an RCA cable from the K3 rear panel 12v line to the amp
 REM connector. The amp turns on and off with the rig.  Current draw is
 minimal; you can also use the same K3 12v to power your P3.
 
 73 de Dick, K6KR
 
> On Mar 14, 2019, at 17:57, Charlie Wirth  wrote:
> 
> Hello:
> 
> I recently purchased a KPA-1500 amplifier.  I would like to be able to
 turn on the amplifier remotely.  The manual says to apply 12v to the REM
 jack.  I was wondering if anyone is doing this and what they are using to
 apply the 12 volts.
> 
> Thanks,
> 
> Charlie W3DDF
> __
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>>> 
>>> 
>>> -- 
>>> 73,
>>> Jorge
>>> CX6VM/CW5W
>>> __
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Re: [Elecraft] Remote On/Off KPA-1500

[Dick Dievendorff]

The programming reference has an ^os command to do this.  The KPA1500 Utility 
Operate tab and KPA1500 Remote programs use this command.

73 de Dick, K6KR

> On Mar 18, 2019, at 19:43, Dave  wrote:
> 
> Also, is there an easy way to also toggle the amp between operate and 
> standby? Would be nice to write an app for a Smartphone, either Apple or 
> Android (I carry both).
> 
> Dave wo2x
> 
> Sent from my iPad
> 
>> On Mar 18, 2019, at 10:38 PM, Jorge Diez - CX6VM  
>> wrote:
>> 
>> hello
>> 
>> what are the diferent ways to turn KPA1500´s on/off remotely?
>> 
>> Is there any way to turn it on/off alone, with no need to turn on/off the
>> K3?
>> 
>> For example i want to turn on K3, but want to have KPA1500 off, is there
>> any way to do that?
>> 
>> thanks,
>> Jorge
>> CX6VM/CW5W
>> 
>> 
>> Libre
>> de virus. www.avast.com
>> 
>> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>> 
>> El jue., 14 mar. 2019 a las 22:08, Dick Dievendorff ()
>> escribió:
>> 
>>> Some do this with an RCA cable from the K3 rear panel 12v line to the amp
>>> REM connector. The amp turns on and off with the rig.  Current draw is
>>> minimal; you can also use the same K3 12v to power your P3.
>>> 
>>> 73 de Dick, K6KR
>>> 
 On Mar 14, 2019, at 17:57, Charlie Wirth  wrote:
 
 Hello:
 
 I recently purchased a KPA-1500 amplifier.  I would like to be able to
>>> turn on the amplifier remotely.  The manual says to apply 12v to the REM
>>> jack.  I was wondering if anyone is doing this and what they are using to
>>> apply the 12 volts.
 
 Thanks,
 
 Charlie W3DDF
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>>> 
>> 
>> 
>> -- 
>> 73,
>> Jorge
>> CX6VM/CW5W
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Re: [Elecraft] Remote On/Off KPA-1500

[Dick Dievendorff]

1) send a serial command ^on1 via the USB port.  This is what the KPA1500 
Utility does.  The amp can process a few commands like this when “off”. The 
KPA1500 Remote program can also do this, via the USB connector. ^on0 turns the 
amp off.

2) supply 12v DC to a rear panel RCA connector. This can be used with a K3 to 
power the amp on with the K3, but any source of 12v will do.

3) pull down (ground) pin 8 on the ACC connector.  Pull it down briefly.

4) send a Wake on LAN “magic packet” via the Ethernet connector.  WoL must be 
enabled with a menu option.The KPA1500 Remote program does this when 
connected to the amp via Ethernet. 

73 de Dick, K6KR



> On Mar 18, 2019, at 19:38, Jorge Diez - CX6VM  wrote:
> 
> hello
> 
> what are the diferent ways to turn KPA1500´s on/off remotely?
> 
> Is there any way to turn it on/off alone, with no need to turn on/off the K3?
> 
> For example i want to turn on K3, but want to have KPA1500 off, is there any 
> way to do that?
> 
> thanks,
> Jorge
> CX6VM/CW5W
> 
>   Libre de virus. www.avast.com
> 
>> El jue., 14 mar. 2019 a las 22:08, Dick Dievendorff () 
>> escribió:
>> Some do this with an RCA cable from the K3 rear panel 12v line to the amp 
>> REM connector. The amp turns on and off with the rig.  Current draw is 
>> minimal; you can also use the same K3 12v to power your P3.
>> 
>> 73 de Dick, K6KR
>> 
>> > On Mar 14, 2019, at 17:57, Charlie Wirth  wrote:
>> > 
>> > Hello:
>> > 
>> > I recently purchased a KPA-1500 amplifier.  I would like to be able to 
>> > turn on the amplifier remotely.  The manual says to apply 12v to the REM 
>> > jack.  I was wondering if anyone is doing this and what they are using to 
>> > apply the 12 volts.
>> > 
>> > Thanks,
>> > 
>> > Charlie W3DDF
>> > __
>> > 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
>> __
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>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> 
> 
> -- 
> 73,
> Jorge
> CX6VM/CW5W
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Re: [Elecraft] Remote On/Off KPA-1500

[Dave]

Also, is there an easy way to also toggle the amp between operate and standby? 
Would be nice to write an app for a Smartphone, either Apple or Android (I 
carry both).

Dave wo2x

Sent from my iPad

> On Mar 18, 2019, at 10:38 PM, Jorge Diez - CX6VM  
> wrote:
> 
> hello
> 
> what are the diferent ways to turn KPA1500´s on/off remotely?
> 
> Is there any way to turn it on/off alone, with no need to turn on/off the
> K3?
> 
> For example i want to turn on K3, but want to have KPA1500 off, is there
> any way to do that?
> 
> thanks,
> Jorge
> CX6VM/CW5W
> 
> 
> Libre
> de virus. www.avast.com
> 
> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
> 
> El jue., 14 mar. 2019 a las 22:08, Dick Dievendorff ()
> escribió:
> 
>> Some do this with an RCA cable from the K3 rear panel 12v line to the amp
>> REM connector. The amp turns on and off with the rig.  Current draw is
>> minimal; you can also use the same K3 12v to power your P3.
>> 
>> 73 de Dick, K6KR
>> 
>>> On Mar 14, 2019, at 17:57, Charlie Wirth  wrote:
>>> 
>>> Hello:
>>> 
>>> I recently purchased a KPA-1500 amplifier.  I would like to be able to
>> turn on the amplifier remotely.  The manual says to apply 12v to the REM
>> jack.  I was wondering if anyone is doing this and what they are using to
>> apply the 12 volts.
>>> 
>>> Thanks,
>>> 
>>> Charlie W3DDF
>>> __
>>> Elecraft mailing list
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>>> This list hosted by: http://www.qsl.net
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>> __
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>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> 
> 
> 
> -- 
> 73,
> Jorge
> CX6VM/CW5W
> __
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Re: [Elecraft] Remote On/Off KPA-1500

[Jorge Diez - CX6VM]

hello

what are the diferent ways to turn KPA1500´s on/off remotely?

Is there any way to turn it on/off alone, with no need to turn on/off the
K3?

For example i want to turn on K3, but want to have KPA1500 off, is there
any way to do that?

thanks,
Jorge
CX6VM/CW5W


Libre
de virus. www.avast.com

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

El jue., 14 mar. 2019 a las 22:08, Dick Dievendorff ()
escribió:

> Some do this with an RCA cable from the K3 rear panel 12v line to the amp
> REM connector. The amp turns on and off with the rig.  Current draw is
> minimal; you can also use the same K3 12v to power your P3.
>
> 73 de Dick, K6KR
>
> > On Mar 14, 2019, at 17:57, Charlie Wirth  wrote:
> >
> > Hello:
> >
> > I recently purchased a KPA-1500 amplifier.  I would like to be able to
> turn on the amplifier remotely.  The manual says to apply 12v to the REM
> jack.  I was wondering if anyone is doing this and what they are using to
> apply the 12 volts.
> >
> > Thanks,
> >
> > Charlie W3DDF
> > __
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
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> >
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>


-- 
73,
Jorge
CX6VM/CW5W
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[Elecraft] K2 resets in operation or TUNE selection - continuing problem

[wa4ywm]

This is an issue I have been dealing with for some time now and the
troubleshooting process has been complex so I will try to be specific about
my questions. Bear with me as I summarize the issue.

My K2/KPA100 performs a complete power reset when TUNE has been activated
for about 10 seconds. It indicates Hi Cur at that point. The radio has to be
on for approximately 2 hours before it exhibits this behavior. 

This problem originally occurred in 2015. Don Wilhelm helped me troubleshoot
it and I thought a solution had been found. The problem showed up again in
2018 and Don worked with me extensively to attempt to resolve it to no
avail. Don finally threw in the towel on email troubleshooting and suggested
I try replacing components in suspect circuits which I have done. 

Note that I have probably put in 100+ hours on this effort.

We narrowed the problem down to something in the SWR Bridge or the LPF since
it appears that the K2 is calling for more power than it can deliver
increasing the current until it resets.

With that very brief summary in place I will now ask some specific questions
which I hope will be picked up on by someone at Elecraft.

NOTE: DURING ALL THE TESTING THE KPA100 IS CONNECTED BUT WITH POWER SUPPLIED
THROUGH THE BASE K2 CONNECTOR.  

I have measured the increase in current in TUNE when the Hi Cur event has
occurred. I broke the 12V supply circuit to the base K2 PA and associated
components to measure the current. During normal TUNE the current is 660mA.
During the Hi Cur event the current is 1.9A - an increase of 1.2A. The
current shown on the K2 display is 4A total. 

1. What is the actual reset mechanism? I thought the re-settable fuse would
not trip until 5A was drawn. If it is re-setting, why at 4A?

2. Why is there a 10 sec delay from initiation of TUNE until the K2 resets?

3. Is there some other mechanism for reset (in the firmware?) in the K2?

4. I have replaced every active component in the SWR Bridge including twice
replacing the D16 & D17 diodes. I have removed and examined T4. What other
components should I look at replacing? This is assuming, of course, that the
problem is in the Bridge.

5. Is there something else that needs to be examined? Although I can't
imagine what hasn't been examined during the troubleshooting by Don and
myself.

6. A basic question - why is there a 2 hour period of power on before TUNE
causes a reset? Believe me I have examined this one over and over. I don't
expect an answer - just wanted to throw it out there.

NOTE: I HAVE PERFORMED ALL UPGRADES DURING THIS ENTIRE PROCESS INCLUDING THE
BASE PA UPGRADE.

NOTE: IF ANYONE WANTS TO TAKE THE TIME TO READ IT, I HAVE COMPILED AND
EDITED ALL OF OUR EMAILS INTO A MORE READABLE DOCUMENT.

I REFUSE TO LET THIS THING BEAT ME! THERE HAS TO BE A SOLUTION TO THIS!

Thanks for reading.

73,
Jim WA4YWM



--
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Re: [Elecraft] Using Elecraft KPA-1500 for 2 radios

[john]

N3RD (a fellow contester) is very responsive and knowledgeable on Top Ten
products.  You should contact him if you have any questions or concerns.  I
am bringing a Top Ten Decoder and 6 way switch to Bonaire for WPX SSB later
this month. 

John KK9A - PJ4R


Tom Georgens W2SC wrote: 

Hi Jim

I bought a bunch of these for my station in 8P.  When you reported your
findings with these devices, I was very concerned.  I had one in 8P with me
at the time and I measured it in my AIM 4170.  I could not reproduce your
observations and used it on 10M with no obvious issues.

Since I have been home, I took another set of measurements with my DG8SAQ
VNA.  They were essentially identical to what I measured in 8P.

Just so we are clear on definitions, I measured them in in both directions
using both ports and a precision 50 ohm load.  In-A had a steadily rising
SWR with frequency, maxing out at 1.1:1 on 28Mhz.  In-B was slightly worse
with the same shape and a max SWR of 1.15:1 at 28 Mhz.  It was the same in
both directions and did not change if the unused port was terminated or
open.  The isolation was essentially as advertised, over 80 dB up to 28 Mhz.

Admittedly 1.15:1 is not world class, and could be better, but I don't
consider it unacceptable and I plan on using the switches I bought.  Are we
drawing different conclusions from the same data?

If you had different measurements, I would be curious if there was some
design change along the way.  I did not open them up.  The units I have were
bought from another ham, but they were unused.  

They also make a product called an Op Swapper that has some other
functionality.  What I am testing is the A/B station selector.

73, Tom W2SC

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Re: [Elecraft] Using Elecraft KPA-1500 for 2 radios

[Ken K6MR]

I have been using 4 of these switches to share one amplifier between two K3s in 
an SO2R setup for the past 4 years.  I was running two KPA500s in parallel, but 
recently switched to a KPA1500.  No problems.



I don’t operate 6 meters, and 10 meters hasn’t been open in so long I can 
honestly say I don’t operate there either!



Ken K6MR




From: elecraft-boun...@mailman.qth.net  on 
behalf of Tom Georgens 
Sent: Monday, March 18, 2019 6:01:04 PM
To: j...@audiosystemsgroup.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Using Elecraft KPA-1500 for 2 radios

Thanks Jim

I did not go all the way to 50Mhz.  You comment indicated a knee at 21 Mhz,
I did not see that.  I saw a linear rise in SWR with frequency.  At 28Mhx,
the resistive component was still close to 50 ohms.  It looks like a fixed
inductance or capacitance that likely could be compensated away if I were so
motivated.

FWIW - their website only provides specifications up to 30 Mhz.   It is
possible that the design scope did not contemplate 50Mhz use.

With 80db of relay isolation, termination should be moot.  I was just
verifying that it was. I saw no difference in a 50 ohm load  or an open.  In
my use case, the unused port will be grounded (I think) so I wanted to be
sure.

They should be fine for my use case, but I can see why they did not work for
you.

I feel better knowing I was not missing anything in my measurements.

Tom



-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Jim Brown
Sent: Monday, March 18, 2019 4:54 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Using Elecraft KPA-1500 for 2 radios

On 3/18/2019 2:38 PM, Tom Georgens wrote:
> Admittedly 1.15:1 is not world class, and could be better, but I don't
consider it unacceptable and I plan on using the switches I bought.  Are we
drawing different conclusions from the same data?

Hi Tom,

Yes, we are. I was using a pair of them to switch inputs and outputs of a
KPA500 an Ten Tec Titan. I use the KPA mostly on 6M, and what you saw on 10M
was significantly worse there.

Another important point. It is totally unrealistic to terminate un-used
ports for isolation measurements, because un-used ports are often not
matched at the frequency where isolation is of concern. I measure isolation
between ports with a VNA (the DG8SAQ VNWA3e). In the case of this unit, I
would measure between the two outputs.

73, Jim

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Re: [Elecraft] shipping KPA1500?

[john]

There is no simple answer however it is easy to get the shipping price on
the USPS website by entering the to and from zipcodes, the box size, weight
and insured value.

John KK9A

Doug Renwick ve5ra wrote 

I need to re-word my question. When returning a KPA 1500 for repair using
USPS, how much is it costing?

Doug

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Re: [Elecraft] Using Elecraft KPA-1500 for 2 radios

[Tom Georgens]

Thanks Jim

I did not go all the way to 50Mhz.  You comment indicated a knee at 21 Mhz,
I did not see that.  I saw a linear rise in SWR with frequency.  At 28Mhx,
the resistive component was still close to 50 ohms.  It looks like a fixed
inductance or capacitance that likely could be compensated away if I were so
motivated.

FWIW - their website only provides specifications up to 30 Mhz.   It is
possible that the design scope did not contemplate 50Mhz use.

With 80db of relay isolation, termination should be moot.  I was just
verifying that it was. I saw no difference in a 50 ohm load  or an open.  In
my use case, the unused port will be grounded (I think) so I wanted to be
sure.

They should be fine for my use case, but I can see why they did not work for
you.

I feel better knowing I was not missing anything in my measurements.

Tom



-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Jim Brown
Sent: Monday, March 18, 2019 4:54 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Using Elecraft KPA-1500 for 2 radios

On 3/18/2019 2:38 PM, Tom Georgens wrote:
> Admittedly 1.15:1 is not world class, and could be better, but I don't
consider it unacceptable and I plan on using the switches I bought.  Are we
drawing different conclusions from the same data?

Hi Tom,

Yes, we are. I was using a pair of them to switch inputs and outputs of a
KPA500 an Ten Tec Titan. I use the KPA mostly on 6M, and what you saw on 10M
was significantly worse there.

Another important point. It is totally unrealistic to terminate un-used
ports for isolation measurements, because un-used ports are often not
matched at the frequency where isolation is of concern. I measure isolation
between ports with a VNA (the DG8SAQ VNWA3e). In the case of this unit, I
would measure between the two outputs.

73, Jim

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[Elecraft] shipping KPA1500?

[Doug Renwick]

I need to re-word my question. When returning a KPA 1500 for repair using
USPS, how much is it costing?

Doug

"The difference between stupidity and genius is that genius has its limits."
Albert Einstein 

-Original Message-

What does Elecraft charge for shipping the KPA 1500 by USPS.

Doug



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Re: [Elecraft] Using Elecraft KPA-1500 for 2 radios

[Jim Brown]

On 3/18/2019 2:38 PM, Tom Georgens wrote:

Admittedly 1.15:1 is not world class, and could be better, but I don't consider 
it unacceptable and I plan on using the switches I bought.  Are we drawing 
different conclusions from the same data?


Hi Tom,

Yes, we are. I was using a pair of them to switch inputs and outputs of 
a KPA500 an Ten Tec Titan. I use the KPA mostly on 6M, and what you saw 
on 10M was significantly worse there.


Another important point. It is totally unrealistic to terminate un-used 
ports for isolation measurements, because un-used ports are often not 
matched at the frequency where isolation is of concern. I measure 
isolation between ports with a VNA (the DG8SAQ VNWA3e). In the case of 
this unit, I would measure between the two outputs.


73, Jim

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Re: [Elecraft] Win4K3Suite ?

[M. George]

Bob, I just saw your question about Win4K3Suite.  I can add my
recommendation to the others that have responding.  I highly recommend it.
I even took the time and made a very detailed YouTube video that you might
be interested in.  It focuses on the capability of sharing the K3/S CAT
feed across multiple software apps and hardware.  Here is the link
if you want to take a look...

https://www.youtube.com/watch?v=zbf7BPfcj4U

I pack a lot of detail in the video... you can jump forward 10 seconds or
back 10 seconds by using the 'J' and 'L' keys on your keyboard or 3 second
jumps using the arrow keys.  This video will give you some good context of
how you can leverage the 'virtual' CAT feeds.  I love this solution because
it's 100% transparent to the software or hardware you are using.  In all
cases, the software or hardware thinks it's directly connected to your K3/S.

Max NG7M

> Thanks to all who responded to my question abt the Win4K3Suite.Sounds
like exactly what I need and a very good program.I'll let you know how it
works out for me.73 de Bob K4RLC

-- 
M. George
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[Elecraft] Fwd: Re: Power output keeps folding back to 5 watts on my KX2

[Tommy]

    Gordon nailed it. Problem resolved. Thank you everyone for your 
replies.


73 de Tom - KB2SMS


 Forwarded Message 











  Bingo Gordon! That was it. I'm showing 12v on transmit now. I had a 
squirrelly connection. Thank you for your reply.


73 de Tom - KB2SMS


On 3/18/19 2:53 PM, Gordon LaPoint wrote:
Its probably not the power supply, but the connectors/wiring/fuses 
between the radio and the power supply.


Gordon - N1MGO

On 3/18/19 2:47 PM, Tommy wrote:
  Ahhh, O.K., with my 13.2v Astron it's showing 10.3 - 10.8. I guess 
for now with this power supply I'll have to settle for 5 watts. Thank 
you for the quick reply.


Tom - KB2SMS


On 3/18/19 2:36 PM, Walter Underwood wrote:
Set the display to show the power supply voltage and watch it while 
you transmit. The transmitter requires a voltage over 11 V for more 
than 5 W.


If the voltage is dropping below 11 V, that is the problem.

This in the specifications section of the KX3 manual.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)


On Mar 18, 2019, at 11:33 AM, Tommy  wrote:

    Hi folks,

  I'm running FT8 with a KX2 powered by a power supply. The rig 
keeps folding back from 10-12 watts to 5 every time and it's barely 
even warm.  I'll set it to 12W for instance, it'll transmit fine at 
that level but when done cut back to 5w. I don't transmit often 
enough for it to get hot enough to protect itself. AGC is off. Any 
ideas? I appreciate any feedback.


73 de Tom - KB2SMS


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Re: [Elecraft] Power output keeps folding back to 5 watts on my KX2

[Nr4c]

Walter. 

While I suspect that voltage requirements for the KX3 are similar to those of 
the KX2, its a KX2 as the device in question. 

And I agree with Don. The underlying issue here is why is the power supply 
voltage so low?  The KX2 (or KX3) shouldn’t draw more than around three Amps 
under full TX power. 

Sent from my iPhone
...nr4c. bill


> On Mar 18, 2019, at 5:00 PM, Walter Underwood  wrote:
> 
> Based on the KX3 specifications, it is designed to run at lower power for 
> full-carrier modes.
> 
> From the transmitter specifications on page 54 of the KX3 Owner’s Manual:
> 
> "5 W or less recommended for high-duty-cycle modes (FM, AM, DATA). Power will 
> automatically be reduced if PA temperature or current limits are exceeded.”
> 
> I’d check the KX2 specs for info on that model.
> 
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
> 
>> On Mar 18, 2019, at 1:55 PM, Bill Frantz  wrote:
>> 
>> Based on a presentation by Eric at the West Valley Amateur Radio 
>> Association, Elecraft tends to build their equipment to run at full 
>> advertised power with digital modes. Their model is a RTTY contester calling 
>> CQ with 60% to 70% of the time transmitting. He indicated that the KPA1500 
>> would run for 5 minutes at full output before needing a rest.
>> 
>> I have not had any problems running my K3 at 100W with FT8. Interestingly, 
>> the fans speed up during the receive part of the cycle.
>> 
>> 73 Bill AE6JV
>> 
>>> On 3/18/19 at 1:39 PM, richard.corfi...@gmail.com (Richard Corfield) wrote:
>>> 
>>> Don't Elecraft recommend using lower power for high duty digital modes?
>>> (Though FT8 us 15s bursts so not as high duty as some).
>> 
>> -
>> Bill Frantz| Government is not reason, it is not eloquence, it is 
>> force; like
>> 408-356-8506   | a fire, a troublesome servant and a fearful master. 
>> Never for a
>> www.pwpconsult.com | moment should it be left to irresponsible action. Geo 
>> Washington
>> 
>> __
>> Elecraft mailing list
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> 
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Re: [Elecraft] Using Elecraft KPA-1500 for 2 radios

[Tom Georgens]

Hi Jim

I bought a bunch of these for my station in 8P.  When you reported your 
findings with these devices, I was very concerned.  I had one in 8P with me at 
the time and I measured it in my AIM 4170.  I could not reproduce your 
observations and used it on 10M with no obvious issues.

Since I have been home, I took another set of measurements with my DG8SAQ VNA.  
They were essentially identical to what I measured in 8P.

Just so we are clear on definitions, I measured them in in both directions 
using both ports and a precision 50 ohm load.  In-A had a steadily rising SWR 
with frequency, maxing out at 1.1:1 on 28Mhz.  In-B was slightly worse with the 
same shape and a max SWR of 1.15:1 at 28 Mhz.  It was the same in both 
directions and did not change if the unused port was terminated or open.  The 
isolation was essentially as advertised, over 80 dB up to 28 Mhz.

Admittedly 1.15:1 is not world class, and could be better, but I don't consider 
it unacceptable and I plan on using the switches I bought.  Are we drawing 
different conclusions from the same data?

If you had different measurements, I would be curious if there was some design 
change along the way.  I did not open them up.  The units I have were bought 
from another ham, but they were unused.  

They also make a product called an Op Swapper that has some other 
functionality.  What I am testing is the A/B station selector.

73, Tom W2SC



-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Jim Brown
Sent: Sunday, March 17, 2019 8:12 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Using Elecraft KPA-1500 for 2 radios

Not a great choice. SWR gets increasing nasty above 15M because the 
construction uses chassis as signal return rather than carrying it on the 
circuit board. It's a two-sided board, but the "ground" layer is broken under 
the traces that carry the RF, so return current can't flow on that layer. I 
didn't have the heart to try to measure crosstalk.

5-6 years ago, I bought several of them for antenna switching, and learned that 
the hard way. I modified them by paralleling copper braid from the connectors 
to the board and following the RF paths through the relays across the board as 
best I could. That reduced the SWR by about half.

I've since replaced all of them, and they're for sale. :)

73, Jim K9YC

On 3/17/2019 6:15 PM, Bill Steffey wrote:
> i use topten a/b coax switches  to switch between the kpa500 & 
> acom  2000 ... one in front of the amps , one in back also 
> have them switching between K3 & an Icom
>
> https://toptendevices.com/products/ab-station-selector/


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Re: [Elecraft] Power output keeps folding back to 5 watts on my KX2

[Don Wilhelm]

Tommy,

That is too much voltage drop.  Check all your power connections to be 
sure they are tight.  If the power supply terminals rotate even a little 
bit, open the power supply and tighten the terminals securely.


Since the KX2 power control tries to maintain the set power, if the 
voltage drops, it has to draw more current.  That means your KX2 may be 
exceeding the current limits due to the reduced voltage.


73,
Don W3FPR

On 3/18/2019 2:47 PM, Tommy wrote:
   Ahhh, O.K., with my 13.2v Astron it's showing 10.3 - 10.8. I guess 
for now with this power supply I'll have to settle for 5 watts. Thank 
you for the quick reply.



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Re: [Elecraft] Power output keeps folding back to 5 watts on my KX2

[Walter Underwood]

Based on the KX3 specifications, it is designed to run at lower power for 
full-carrier modes.

From the transmitter specifications on page 54 of the KX3 Owner’s Manual:

"5 W or less recommended for high-duty-cycle modes (FM, AM, DATA). Power will 
automatically be reduced if PA temperature or current limits are exceeded.”

I’d check the KX2 specs for info on that model.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Mar 18, 2019, at 1:55 PM, Bill Frantz  wrote:
> 
> Based on a presentation by Eric at the West Valley Amateur Radio Association, 
> Elecraft tends to build their equipment to run at full advertised power with 
> digital modes. Their model is a RTTY contester calling CQ with 60% to 70% of 
> the time transmitting. He indicated that the KPA1500 would run for 5 minutes 
> at full output before needing a rest.
> 
> I have not had any problems running my K3 at 100W with FT8. Interestingly, 
> the fans speed up during the receive part of the cycle.
> 
> 73 Bill AE6JV
> 
> On 3/18/19 at 1:39 PM, richard.corfi...@gmail.com (Richard Corfield) wrote:
> 
>> Don't Elecraft recommend using lower power for high duty digital modes?
>> (Though FT8 us 15s bursts so not as high duty as some).
> 
> -
> Bill Frantz| Government is not reason, it is not eloquence, it is 
> force; like
> 408-356-8506   | a fire, a troublesome servant and a fearful master. 
> Never for a
> www.pwpconsult.com | moment should it be left to irresponsible action. Geo 
> Washington
> 
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[Elecraft] shipping KPA1500?

[Doug Renwick]

What does Elecraft charge for shipping the KPA 1500 by USPS.

Doug

"The difference between stupidity and genius is that genius has its limits."
Albert Einstein 


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Re: [Elecraft] Power output keeps folding back to 5 watts on my KX2

[Bill Frantz]

Based on a presentation by Eric at the West Valley Amateur Radio 
Association, Elecraft tends to build their equipment to run at 
full advertised power with digital modes. Their model is a RTTY 
contester calling CQ with 60% to 70% of the time transmitting. 
He indicated that the KPA1500 would run for 5 minutes at full 
output before needing a rest.


I have not had any problems running my K3 at 100W with FT8. 
Interestingly, the fans speed up during the receive part of the cycle.


73 Bill AE6JV

On 3/18/19 at 1:39 PM, richard.corfi...@gmail.com (Richard 
Corfield) wrote:



Don't Elecraft recommend using lower power for high duty digital modes?
(Though FT8 us 15s bursts so not as high duty as some).


-
Bill Frantz| Government is not reason, it is not 
eloquence, it is force; like
408-356-8506   | a fire, a troublesome servant and a fearful 
master. Never for a
www.pwpconsult.com | moment should it be left to irresponsible 
action. Geo Washington


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Re: [Elecraft] Power output keeps folding back to 5 watts on my KX2

[Richard Corfield]

Don't Elecraft recommend using lower power for high duty digital modes?
(Though FT8 us 15s bursts so not as high duty as some).

 - Richard

On Mon, 18 Mar 2019 at 18:46, Tommy  wrote:

>Ahhh, O.K., with my 13.2v Astron it's showing 10.3 - 10.8. I guess
> for now with this power supply I'll have to settle for 5 watts. Thank
> you for the quick reply.
>
> Tom - KB2SMS
>
>
> On 3/18/19 2:36 PM, Walter Underwood wrote:
> > Set the display to show the power supply voltage and watch it while you
> transmit. The transmitter requires a voltage over 11 V for more than 5 W.
> >
> > If the voltage is dropping below 11 V, that is the problem.
> >
> > This in the specifications section of the KX3 manual.
> >
> > wunder
> > K6WRU
> > Walter Underwood
> > CM87wj
> > http://observer.wunderwood.org/ (my blog)
> >
> >> On Mar 18, 2019, at 11:33 AM, Tommy  wrote:
> >>
> >> Hi folks,
> >>
> >>   I'm running FT8 with a KX2 powered by a power supply. The rig
> keeps folding back from 10-12 watts to 5 every time and it's barely even
> warm.  I'll set it to 12W for instance, it'll transmit fine at that level
> but when done cut back to 5w. I don't transmit often enough for it to get
> hot enough to protect itself. AGC is off. Any ideas? I appreciate any
> feedback.
> >>
> >> 73 de Tom - KB2SMS
> >>
> >> __
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Re: [Elecraft] Power output keeps folding back to 5 watts on my KX2

[Tommy]

  Ahhh, O.K., with my 13.2v Astron it's showing 10.3 - 10.8. I guess 
for now with this power supply I'll have to settle for 5 watts. Thank 
you for the quick reply.


Tom - KB2SMS


On 3/18/19 2:36 PM, Walter Underwood wrote:

Set the display to show the power supply voltage and watch it while you 
transmit. The transmitter requires a voltage over 11 V for more than 5 W.

If the voltage is dropping below 11 V, that is the problem.

This in the specifications section of the KX3 manual.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)


On Mar 18, 2019, at 11:33 AM, Tommy  wrote:

Hi folks,

  I'm running FT8 with a KX2 powered by a power supply. The rig keeps 
folding back from 10-12 watts to 5 every time and it's barely even warm.  I'll 
set it to 12W for instance, it'll transmit fine at that level but when done cut 
back to 5w. I don't transmit often enough for it to get hot enough to protect 
itself. AGC is off. Any ideas? I appreciate any feedback.

73 de Tom - KB2SMS

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Re: [Elecraft] Power output keeps folding back to 5 watts on my KX2

[Walter Underwood]

Set the display to show the power supply voltage and watch it while you 
transmit. The transmitter requires a voltage over 11 V for more than 5 W.

If the voltage is dropping below 11 V, that is the problem.

This in the specifications section of the KX3 manual.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Mar 18, 2019, at 11:33 AM, Tommy  wrote:
> 
>Hi folks,
> 
>  I'm running FT8 with a KX2 powered by a power supply. The rig keeps 
> folding back from 10-12 watts to 5 every time and it's barely even warm.  
> I'll set it to 12W for instance, it'll transmit fine at that level but when 
> done cut back to 5w. I don't transmit often enough for it to get hot enough 
> to protect itself. AGC is off. Any ideas? I appreciate any feedback.
> 
> 73 de Tom - KB2SMS
> 
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[Elecraft] Power output keeps folding back to 5 watts on my KX2

[Tommy]

   Hi folks,

 I'm running FT8 with a KX2 powered by a power supply. The rig 
keeps folding back from 10-12 watts to 5 every time and it's barely even 
warm.  I'll set it to 12W for instance, it'll transmit fine at that 
level but when done cut back to 5w. I don't transmit often enough for it 
to get hot enough to protect itself. AGC is off. Any ideas? I appreciate 
any feedback.


73 de Tom - KB2SMS

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Re: [Elecraft] BKM for shipping KPA1500?

[Hisashi T Fujinaka]

Thanks Don. I just wanted to make sure.

I have one more test to do - to try a new cable. The ohmmeter said the
old cable was fine but I'm having a cable sent.

On Mon, 18 Mar 2019, Don Wilhelm wrote:


The box it shipped in with the internal supports should work fine.
While I prefer UPS, any of the other carriers will be fine.

Email supp...@elecraft.com and request an RSA.  Do not ship it until you have 
the RSA form filled out and follow the shipping instructions.


73,
Don W3FPR

On 3/18/2019 12:13 PM, Hisashi T Fujinaka wrote:

"BKM" = best known methods

I think I may have to ship back a broken KPA1500 and so I'm wondering
what others have done to ship it. I'm pretty sure I have the box it came
in, but it may need better packing.

I know it'll cost me a bit to ship, but a broken amp is not doing me any
good. What's the safest? FedEx store? UPS store?

And, of course, I'm waiting for support to confirm before I ship it.
They haven't been the most pleasant, but that's a different story for
another day.

Thanks.





--
Hisashi T Fujinaka - ht...@twofifty.com
BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee
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Re: [Elecraft] BKM for shipping KPA1500?

[Don Wilhelm]

The box it shipped in with the internal supports should work fine.
While I prefer UPS, any of the other carriers will be fine.

Email supp...@elecraft.com and request an RSA.  Do not ship it until you 
have the RSA form filled out and follow the shipping instructions.


73,
Don W3FPR

On 3/18/2019 12:13 PM, Hisashi T Fujinaka wrote:

"BKM" = best known methods

I think I may have to ship back a broken KPA1500 and so I'm wondering
what others have done to ship it. I'm pretty sure I have the box it came
in, but it may need better packing.

I know it'll cost me a bit to ship, but a broken amp is not doing me any
good. What's the safest? FedEx store? UPS store?

And, of course, I'm waiting for support to confirm before I ship it.
They haven't been the most pleasant, but that's a different story for
another day.

Thanks.


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Re: [Elecraft] KPA1500 placement question

[Don Wilhelm]

Sorry, but Dick preempted me.  His answer is correct.  Provide spacers 
if you want to mount them together.


73,
Don W3FPR

Ronnie,

Not a problem at all. Many want to locate the power supply on the floor 
to save space and keep the fan noise a bit further away. If you choose 
that, put the power supply vertically on its front panel.


73,
Don W3FPR

On 3/18/2019 12:24 PM, Ronnie Hull wrote:
I may already know the answer to this but would it be foolishness to 
set the amp on top of the power supply?

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Re: [Elecraft] KPA1500 placement question

[Don Wilhelm]

Ronnie,

Not a problem at all.  Many want to locate the power supply on the floor 
to save space and keep the fan noise a bit further away.  If you choose 
that, put the power supply vertically on its front panel.


73,
Don W3FPR

On 3/18/2019 12:24 PM, Ronnie Hull wrote:

I may already know the answer to this but would it be foolishness to set the 
amp on top of the power supply?

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Re: [Elecraft] KPA1500 placement question

[dick]

I'm afraid so.

Page 9 of the KPA1500 owner's manual, first sentence:

"Provide at least 4" (10 cm) clearance behind the RF Deck fans and above the
Power Supply top cover." 

73 de Dick, K6KR

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Ronnie Hull
Sent: Monday, March 18, 2019 09:24
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 placement question

I may already know the answer to this but would it be foolishness to set the
amp on top of the power supply?

Ronnie W5SUM

Sent from my iPhone
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[Elecraft] KPA1500 placement question

[Ronnie Hull]

I may already know the answer to this but would it be foolishness to set the 
amp on top of the power supply?

Ronnie W5SUM

Sent from my iPhone
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[Elecraft] BKM for shipping KPA1500?

[Hisashi T Fujinaka]

"BKM" = best known methods

I think I may have to ship back a broken KPA1500 and so I'm wondering
what others have done to ship it. I'm pretty sure I have the box it came
in, but it may need better packing.

I know it'll cost me a bit to ship, but a broken amp is not doing me any
good. What's the safest? FedEx store? UPS store?

And, of course, I'm waiting for support to confirm before I ship it.
They haven't been the most pleasant, but that's a different story for
another day.

Thanks.

--
Hisashi T Fujinaka - ht...@twofifty.com K7EMI
BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee
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Re: [Elecraft] KPA1500 PA Current

[Ignacy]

At 1500W my Expert 2k-FA reports 50-52A at 49 V. About 55A at 1800W.  The
Expert saturates at 2 KW. 

You may check out the SWR with a reputable meter. Often multiple meters show
different values on different frequencies. For instance at my station LP100
shows 1.4:1, 2k-fa shows 1.2:1, and K3 shows 1.8:1.  But no problem in the
end.

Ignacy, NO9E



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Re: [Elecraft] Why are the batteries internal to the KX3?

[Petr, OK1RP/M0SIS]

Hi,

I guess you do not need to removing cells even you planning to put on shelf
for 2-3 months when you have NiMH inside. There should not be the leakage
risk and when you will stock it charged it should not be an issue.
Also I do not removing the bat even although I am using the KX3 powered from
PSU, just charging is OFF and they can stay inside peacefully.
...just me experience.







-
73 - Petr, OK1RP 
"Apple & Elecraft freak" 
B:http://ok1rp.blogspot.com
G+:http://goo.gl/w3u2s9
G+: http://goo.gl/gP99xq
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