[R-390] Mechanical filter substitute

[rbethman]

Since we ARE off on another wild hair - How about pan fried Kielbasa?  
What's the impedance?

Bob - N0DGN (( Duckin' and Runnin' !))

Bob Camp wrote:
> Hi
>
> The R-390A filters are high impedance. I don't remember the exact 
> numbers, but > 100K ohms would not surprise me at all.
>
> Bob
>
>
> On Dec 18, 2007, at 12:09 PM, Jon Schlegel wrote:
>
>> 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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>>
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