KH7T wrote:
>Lets not forget that if the strong signal is on one side you can sneak
up on him using pass band tuning and the very sharp skirt of the 1 kHz.
filter combined with the DSP filter with the optimal bandwidth.
The 1 kHz filter skirts are not very sharp since it's a 4-pole
and has a 4.7 shape factor, but your idea is correct. See graphs down
the following page which illustrate your point (but using the Inrad 762.
http://users.vnet.net/btippett/inrad_.htm
Orion's standard 6000, 2400 and 1000 are all 4-pole filters, as is the
Inrad 762. For a roofing filter, this is all that is required since
DSP filters provide sharper filtering further down the IF chain.
73, Bill W4ZV
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