[R-390] Mechanical filter substitute

[Barry Hauser]

Impedance is variable -- adjust length, or to reduce impedance, add some 
of that red sauerkraut.  To increase impedance, incorporate some perogis.

(I actually had a dinner of all three -- kielbasa, red kraut & perogis 
-- last night -- hopefully in the correct proportions.  I kid you not.)

Barry



rbethman wrote:
> 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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