Don,
Today I have checked all connections in KPA100 T-R switch - they was OK.
After connection checking I assembled KPA100/KAT100 again and started
TX on 17 m again - the problem still occurred.
But .... as you know I'm digi modes fan so, all the TRX keying was
made by computer. Today, when I have been use VOX or foot switch the
problem disappeared!
In this moment I know, the problem occurs only when computer control K2 keying.
So, it clears why TUNE coming back RX to normal sensitivity.
Do you know what can I do now?
73,
Marcin SQ2AF
K2 #5408
2006/9/7, Don Wilhelm <[EMAIL PROTECTED]>:
Mike,
I am certain Marcin will be interested in your results when portable. The
only thing that I can think of is a bad connection in the KPA100 T-R switch,
but then I am just guessing. Marcins's problem continues until the KPA100
switches out at the 10 watt level, so your problem may be different.
73,
Don W3FPR
> -----Original Message-----
> Don,
>
> I am experiencing the same or a very similar problem as Marcin. It
> only happens on 17M and only at high power. That is why we do not
> see it after a Tune operation. If I turn the power down to 30W or
> less, no problem. It makes no difference whether the KPA100 is the
> top cover or remoted in an EC2 with the KAT100. I haven't determined
> exactly how much power I have to be running before the problem
> occurs. I suspect RF getting somewhere it shouldn't but have not had
> the time to track it down. It does seem to be antenna dependent even
> though I get a good match to the 102 foot doublet I use. I will get
> a chance to test my theory next week when I take the K2/100 portable
> for a week using a different antenna than I do at home. If it occurs
> only at the home QTH then the problem is in the antenna system and
> probably stray RF affecting something in the K2.
>
> 73,
> Mike K2/100 #2221
>
> At 01:31 PM 9/6/2006, Don Wilhelm wrote:
> >Marcin,
> >
> >There is nothing in the KPA100 or the base K2 that would cause
> that problem
> >on 17 meters only.
> >In the base K2, the relay switching is shared for 17 and 15 meters except
> >for relay K6 in the bandpass filter, and in the KPA100, all circuits are
> >shared between 17 and 20 meters. You would have a problem on either 20
> >meters or 15 meters in addition to 17 meters if it was associated with
> >either the K2 or KPA100 switching relays.
> >
> >If you have a dedicated 17 meter antenna, you may want to investigate the
> >switching to that antenna.
> >
> >TUNE should behave the same as transmit, but you say that receive
> >sensitivity does not drop after TUNE - that is indeed strange.
> We need more
> >data.
> >
> >73,
> >Don W3FPR
> >
>
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