KPA1500 Drive Power

[Elecraft mailing list]

Noone has responded to my previous inquiry about the KPA1500 power drop-off due to heat.  I would like to know if the KPA1500 power output actually drops off due to heat build-up or because the SWR display was erroneously showing a power drop before it was fixed.  Thanks,  Roy Morris W4WFB
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[Bill K9YEQ]

Roy, I owned and will soon have Kpa1500.  Yes power will drop if heat becomes an issue and you will fault.  The amp logs the condition when it faults.

Have a great day,
Bill J

________________________________
From: [hidden email] <[hidden email]> on behalf of Roy Morris, Jr. via Elecraft <[hidden email]>
Sent: Tuesday, June 5, 2018 2:36:52 PM
To: Elecraft Reflector
Subject: [Elecraft] KPA1500 Drive Power

Noone has responded to my previous inquiry about the KPA1500 power drop-off due to heat.  I would like to know if the KPA1500 power output actually drops off due to heat build-up or because the SWR display was erroneously showing a power drop before it was fixed.  Thanks,  Roy Morris W4WFB
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[Bill K9YEQ]

Read that: I owned Kpa500...

Have a great day,
Bill J

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From: Bill Johnson <[hidden email]>
Sent: Tuesday, June 5, 2018 11:24:08 PM
To: Elecraft Reflector; Roy Morris, Jr.
Subject: Re: [Elecraft] KPA1500 Drive Power

Roy, I owned and will soon have Kpa1500.  Yes power will drop if heat becomes an issue and you will fault.  The amp logs the condition when it faults.

Have a great day,
Bill J

________________________________
From: [hidden email] <[hidden email]> on behalf of Roy Morris, Jr. via Elecraft <[hidden email]>
Sent: Tuesday, June 5, 2018 2:36:52 PM
To: Elecraft Reflector
Subject: [Elecraft] KPA1500 Drive Power

Noone has responded to my previous inquiry about the KPA1500 power drop-off due to heat.  I would like to know if the KPA1500 power output actually drops off due to heat build-up or because the SWR display was erroneously showing a power drop before it was fixed.  Thanks,  Roy Morris W4WFB
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[K9MA]

Mine seems to have fixed itself. Output was dropping from 1500 to about
1100 W when it warmed up, but I just operated an hour in the CWT, and it
never dropped below 1400.  That was consistent with the tests I ran the
other day.  I had just come up with theory that the power drop was
caused by something ELSE in the amp heating up, not just the heat sink
for the MOSFET's.  That might have explained why the problem didn't show
up in my brief tests. Now I just don't know what's happening.  More data
required.

73,
Scott K9MA


On 6/5/2018 23:24, Bill Johnson wrote:

> Roy, I owned and will soon have Kpa1500.  Yes power will drop if heat becomes an issue and you will fault.  The amp logs the condition when it faults.
>
> Have a great day,
> Bill J
>
> ________________________________
> From: [hidden email] <[hidden email]> on behalf of Roy Morris, Jr. via Elecraft <[hidden email]>
> Sent: Tuesday, June 5, 2018 2:36:52 PM
> To: Elecraft Reflector
> Subject: [Elecraft] KPA1500 Drive Power
>
> Noone has responded to my previous inquiry about the KPA1500 power drop-off due to heat.  I would like to know if the KPA1500 power output actually drops off due to heat build-up or because the SWR display was erroneously showing a power drop before it was fixed.  Thanks,  Roy Morris W4WFB
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

--
Scott  K9MA

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