all,
i am experiencing very lo sensitivity from 3 of 4 transverters (all DEM @ 50, 144, 222, 432). of the 4 only 2 meters has an extra gain stage on the rf side near the antenna which i can switch in and out remotely. when the preamp is on the k2 acts like my old if and has reasonable background noise level and signal levels from the local beacons. when i switch it off, it is anemic like the other 3 transverters.
on the other 3, i hear no real rise in background noise when i switch the transverters on and off, and the local beacons sound like real dx way in the noise. i have the preamp on. i also hear no improvement when i switch the agc off. i have confirmed that the pin diodes are appropriately forward biased in tx and rx.
the total gain of the transverters (except 2m) was never exceedingly high with my old kenwood 820 if, but this is not acceptable. i cant hear anything.
i guess i could do the mod to boost the (i think) IF gain of the k2, but i don't want to ruin the dynamic range on HF.
any suggestions of what to try?????
tnx,
ed wa3drc
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