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
> -----Original Message-----
> Hi all,
>
> In last Friday I have been finished KAT100/KPA100 in EC2.
> Few days ago one problem occurred - before TX on 17m RX is OK, after TX on
> this band RX dropping down. This is only on HI power range, on LOW
> power range everything is OK.
> When I change band to other then 17m and then come back to 17m RX stay
> OK to the TX and then drop down again. When I Off then On K2 or push
> TUNE key, RX come back to normal.
> Is anyone know what is the problem?
>
> 73,
> Marcin SQ2AF
>
> K2 #5408
>
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