[Elecraft] re osc problem on kpa100

Sun Oct 27 21:53:00 2002

I had (have?) a very similar problem and tore my hair out trying
to solve it. It only occured on SSB and only with a "real"
antenna, dummy loads worked fine. My first thought was
the bias adjustment which I redid and the problem seemed
to disappear. However, since then I've had the "top" off
a couple of times and the problem recurrs everytime
I put it back together, suggesting that its a loose connection
problem or a lead dressing problem. I've not been able to
find anything loose, but I do find that if I take the right
(as viewed from the front) side panel off when  re-installing
the top and then dress the interconnects AWAY from
the SSB board that the problem goes away.

Go figure.

73,
Doug W6JD
K2/100 #1626

----- Original Message ----- 
From: "ken cubilo electric" <[email protected]>
To: <[email protected]>
Sent: Saturday, October 26, 2002 12:09 PM
Subject: [Elecraft] re osc problem on kpa100

> I did a little more checking into this problem and find that it will
> occur at just about anypower level that the pa is switched into the
> transmit path, also when the high ref warning goes off pressing the mike
> button results in power outputs of 100-150 watts regardless of the power
> setting on the front panel, it will reset when you press the mode button
> and then reset the high ref alarm, it will not happen with a 50 ohm
> dummy load in line. My memory seems to recall someone else on the list
> was having a problem like this. anyway it kind of sounds like rf is
> getting into the unit somewhere. I just went thru and did a alignment on
> both the k2 and the kpa100 and double checked the bias adjustment on the
> kpa100. anyone got any ideas?
> ken w8ob
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