[TenTec] Problem w/Omni VI and INRAD filter

[Bill Fuqua]

If they are ladder filters it drift may be mostly due to the quality of 
capacitors used.

73
Bill wa4lav


At 12:20 PM 11/20/2003 -0500, K3BU at aol.com wrote:
>In a message dated 11/20/03 11:14:04 AM Eastern Standard Time,
>k5uj at 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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