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.
On 1/24/2011 11:17 AM, NL7VL wrote:
> 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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