[R-390] Mechanical filter substitute

[Jon Schlegel]

Thanks for all the info guys,

Bob C - I'll cobb in the 10k to see what happens.  BTW, Maybe Bob N. 
should try using one of the Motorola Permakay filters.  Think I still 
got a few around here somewhere...

Also what are the in/out Zs of the mechanical filters.  If I want to 
measure one what source/load should it be looking into?

Jon



At 09:23 AM 12/18/2007 -0600, you wrote:
>On Dec 18, 2007 9:14 AM, Bob Camp <ham at cq.nu> wrote:
>
> > Before you go to crazy - sling a 10K ohm resistor between input and
> > output directly on the filter.
>
>Good tip, Bob.   And it reminded me - at the Belevidere IL hamfest I 
>saw a Collins 75A series receiver that had a homebrew "filter 
>replacement" in it.  This was a small perf-board with a couple of 
>chokes and capacitors which would obviously be for wideband AM but I 
>thought it would be neat to give it a try.   Of course I forgot to 
>go back and sketch the circuit!   Wonder if anyone knows about this 
>and has the design details?
>
>73, Bob W9RAN
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