Maybe, and if you're right, my suggestion may not help. But you
misunderstood my suggestion. There is an insert point between the
T/R switch and the RX input. That's the RX loop I was talking about
-- you insert the filter there.
The insert point is *after* the PIN diode T/R switches for both the HPA
(KPA3) and 10W LPA. Given Vic's description, it is likely the noise is
being generated in one or more of the PIN diodes in the T/R switching
and placing the highpass filter in the insert point will not resolve
the noise. Vic, you can bypass (disable) the KPA3 to see if the noise
generation is in the KPA3 T/R switch.
73,
... Joe, W4TV
On 2014-10-23 4:36 PM, Jim Brown wrote:
On 10/23/2014 10:36 AM, Vic Rosenthal 4X6GP/K2VCO wrote:
It isn't necessary to filter the loop. What is happening is that BC RF
is coming into the ANT1 connector of the K3 from the vertical, where
it is mixing up with every other signal around, probably in the t/r
switch section. Then the IMD products (which are on numerous
frequencies) are getting re-radiated by the vertical, and they are
picked up by the loop.
Maybe, and if you're right, my suggestion may not help. But you
misunderstood my suggestion. There is an insert point between the T/R
switch and the RX input. That's the RX loop I was talking about -- you
insert the filter there.
73, Jim K9YC
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