Gordon,
I am going to give you a slightly different answer than I have seen
posted on the reflector.
If diversity mode is your main consideration, then ideally, you need to
have matched filters
The 5 pole filters can be matched at extra cost from Elecraft, but the
9 pole Inrad filters supposedly have zero offset and do not have to be
matched.
The matching problem becomes less important at wider filter bandwidths,
so since you have the 2.7 kHz filter in the main already, you can get
another 2.7 for the subRX and average the offsets. It is not the ideal,
but it will work fine for diversity reception.
73,
Don W3FPR
On 12/18/2012 6:28 AM, mm0gpz wrote:
Hi.
My K3 has a standard 2.7 Khz ssb filter, a narrow 2.1 Khz ssb filter and a
400 hz cw filter.
I am planning to purchase the sub RX KRX3 and would like some filter advice
please. I am much more interested in CW.
Do I have to match up all these filters on the Sub RX for diversity? I know
the 2.7 Khz is standard but for diversity I seem to remember reading the
same filters should be in place? I also seem to recall that the filters are
not cascaded so in essence, only one filter is in line at a time. So if I
purchase only the 400 hz filter for the sub RX, it diversity reception will
work fine as long as the 400 hz filter is selected for CW or SSB will be
fine between > 2100 and 2700?
What would happen if I engaged the 2.1 SSB filter in main RX and I don't
have same filter in Sub RX.
Thanks for your time.
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