> Orion has last two filter positions of 500 and 250 Hz selectivity
configured
> with additional amplifier stage, aimed at compensating the loss of the
> narrower filters. This is causing degradation of overload performance and
adding more
> noise.
> Better solution is to use original 1000Hz filter position and replace the
> 1000 filter with 600 Hz filter or disable the amps. W4ZV came up and
collected
> orders for special order of 600 Hz filter kits from INRAD. This provides
further
> improvement in excellent Orion performance without degradation due to the
> amps in the 500 and 250 designated positions.
> It would have been better to not use amplifiers in those last positions
and
> if more gain needed, use the preamp.
>
> Yuri, K3BU.us
Thank you Yuri,
I could tell that additional gain is introduced when switching to 500 and
250 Hz filters but did not know it degrades the performance of the radio to
such an extend. Thanks for the explanation.
73, Igor UA9CDC
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|