I run a 10 watt beacon on 28.2985. Tuning across 144.302 (K3 + internal
transverter), I hear an S9 image of the 10M beacon signal. My first thought
was maybe some sort of harmonic so I installed a low pass filter on the
beacon. Still S9 on 144.302. I brought the low pass filter into the shack
and installed it on the VHF output of the K3. Indeed, signals on 2M were
significantly attenuated (>40 dB) but the image was still S9 (unchanged).
After a bit of head scratching, I disconnected the HF antenna from the K3
and the signal dropped to S1.
This seems like a case of front end overload/inadequate port isolation. I
tend to believe there's nothing wrong with the K3 or internal transverter
... the RF levels from a 10 Watt transmitter coupled to a 10M antenna 45
feet away may be expecting a bit much. I'm tempted to leave things alone,
but invite comments from the masses.
Dennis, K7FL
Battle Ground, WA
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