[R-390] Mechanical filter substitute

[Bob Camp]

Hi

Well to work as an IF load the Kielbasa needs to match the plate  
supply fairly well. To "fresh" and it just blows the fuse. To well  
aged and it doesn't dissipate enough power. I find that if you leave  
them in the 'fridge for about six to ten years, they are just about  
right. You can accelerate the process by leaving them on the kitchen  
counter for a month or two, but that's likely to give you a phase  
angle issue. The angle is the one the fry pan makes as the wife takes  
a swing at you. Somehow they just don't understand impedance ....

Bob


On Dec 18, 2007, at 2:30 PM, 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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>>>
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>