WU7R:
>I didn't order any filters not knowing which ones to order.
Since Elecraft has now posted the data I needed, here's what
I'm probably going with:
Main RX: 2.7k stock, 1.8k 8-pole, 500 Hz 5-pole
Sub RX: 2.7k stock, 500 Hz 5-pole
My reasoning is that the 1.8 will be useful both for
contesting SSB and also S&P CW. I like the 500 over the 400 because
it is 130 Hz wider and the IMD performance is nearly identical. I
might later decide to try a 1.0 if the 1.8 is not sufficient, but my
guess is it will be OK. In Orion I used a 600 Hz 4-pole most of the
time and then an 8-pole 1.8 kHz for contesting SSB and CW S&P. The
way these DSP rigs work, the effective bandwidth of a 1800 Hz filter
on CW is actually more like 900 + the CW Pitch you select...so if you
like a 400 Hz Pitch, the effective BW of an 1800 is actually more
like 1300Hz (due to the fact that the DSP truncates the filter
response below 0 Hz).
Eventually I may order another K3 for SO2R with Main RX only
and the same set of Main filters above. The reason I don't need the
1.8k for the Sub above is that I mainly plan use use it for diversity
RX on CW (on 160 meters).
73, Bill W4ZV
P.S. For most folks (non-contesters or low band DXers), the stock
2.7k filters are probably all you need. Remember that these filters
are *only* for IMD/BDR issues with signals above about S9+30. Your
final selectivity is still determined by the DSP filters with
selectable BWs every 50 Hz.
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