Neal - That is the set-up I am running, three INRAD filters in a row.
An INRAD CW roofing filter and INRAD 250Hz filters in both IFs. It
works really well in contesting. For casual operating I run the INRAD
roofing filter with 500Hz TT filters in both IFs. So, obviously I have
the roofing filter set to turn on on both N-1 and N-2. If I need to use
the noise blanker (like on 160) I can't run the roofing filter as the
narrow bandwidth screws up the blanking operation. So then I just run
the primary 500 or 250 filters. This set-up works great for me.
The gain balance is good with the roofing filter and cascaded INRAD
250Hz filters. Before this set-up I had some issues with the TT 250Hz
filters installed. The passbands didn't work well together and I had to
add some additional gain.
John
N9RE
On 1/24/2011 11:17 AM, NL7VL wrote:
Don,
Do you have the instruction sheet? It can be wired to work off of
either N1, N2, or full-time. If it was not using one of the narrow
switches you would certainly notice it on SSB. I'm still trying to
figure out if installing the 9MHz CW filter into the N1 position would
cause the roofing filter to drop out, but I would doubt it.
That would be quite the CW setup to have the CW roofing filter, and
INRAD CW filters both IFs! I believe you can install the CW filter in
either position, so if the roofing filter is controlled by N1, N2 would
bring the 9MHz CW filter into the circuit, too. I don't think you can
easily use N1 to control both. I'm sure it *could* be done, but getting
things working normally would be the first task.
I'm not sure about the gain setting but you probably would want the
high gain with 20 poles of filtering :)
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