[TVARC] Batavia FT8 Contest - 2020 - SOAB-HP

[John Ellis]

It is an overshoout from the exciter to the amp.
I am using an Elecraft W2 between the K3s and
the KPA500/KAT500 combo so I can instantly
monitor my drive power and tune/set/monitor
the antennas and any adjustments I need to
makebefore I hit them with the linear.

Doesn't seem to make any difference in operation
though. But it is there.

Just my 0.2¢...

73,
J




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On Mon, Aug 17, 2020 at 5:43 AM Rich Erlichman <rich.erlichman at gmail.com>
wrote:

> Pete and Ed,
>
> I too, see the overshoot on the LEDs when the amp initially keys up. I have
> a feeling it is a peak reading, and then quickly settles down to the
> average
> wattage output.
> I found the ARRL review video and it shows the exact same response when
> keyed. https://www.youtube.com/watch?v=V-PTEKc3fnI
> And what do you mean now that I settled down???
>
> 73, Rich, ND4G
>
> -----Original Message-----
> From: k2te at juno.com [mailto:k2te at juno.com]
> Sent: Sunday, August 16, 2020 9:05 PM
> To: psk2ps at gmail.com
> Cc: rich.erlichman at gmail.com; tvarc at mailman.qth.net
> Subject: Re: [TVARC] Batavia FT8 Contest - 2020 - SOAB-HP
>
> Pete,
>
> I've observed the same behavior on occasion.  My thought is it's from a
> momentary overshoot by the exciter causing an overdrive situation.  The
> K3 remembers the drive setting for each band and mode.  I've had it show
> 500-530W on 40 CW without any ill effects.  On modes like FT8 and RTTY
> where the DC is higher, the amp backs off 10-20W from peak when it gets
> hot while running.
>
> Solid state is nice for efficiency and weight but give me an Eimac tube
> and a BIG power supply for plenty of head room.
>
> 73 de Ed
>
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-- 

John Ellis         (NP2B)
1149 Mockingbird Lane
The Villages, FL 32163

telephone 352 633-2910
facsimile  352 633-0401
mobile     340 513-4928
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