[R-390] Mechanical filter substitute

[Les Locklear]

That would probably depend on whether you were using a cast iron pan or a 
corning ware glass type.....;-)

Les
----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: <r-390 at mailman.qth.net>
Sent: Tuesday, December 18, 2007 1:30 PM
Subject: Re: [R-390] Mechanical filter substitute


> 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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