In a message dated 11/20/03 11:14:04 AM Eastern Standard Time,
k5uj@hotmail.com writes:
>>They are wide enough to where they are right up against the carrier. This
makes R3 and R4 nulling adjustments critical. <<
OmniVI is BFO (and passband setting) is drifting, make sure that the
alignments is done after rig is warmed up and stabilized. For overall rig
temperature
"management" it is perhaps best to minimize heat transfer from the finals by
using cooling fan, this helps to even out extremes (like RX time vs. contest
perpetual CQing).
Seems that problem is caused by different positioning of the filter's curve
vs. BFO frequency and greater sensitivity to suppression of the carrier by
balancing circuit. Crystals and filters can drift with time, depends on quality
of
manufacturing.
Yuri, K3BU
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