5 KC AM filter project

[Joe]

>could it really be just a plain ol 56 pf cap?
Its 0.56 all right, Heath Part # 28-3

>what about that tapped coil? how you going to get around that one?
That was the easy part.... there are 2 in every SSB filter.
The  AM filter only used one (the same one) Part # 40-814
There may be other solutions, the slug tune coil allows for exact setting of
the center frequency.
It may have been so the manufacturer could use quick cut quantity looser
toleranced less expensive xtals
(Frequency, series resistance and capacitance) yet still make spec.

The late 3.75 KC filter *may* have used the same xtals used on the HW-SB
modulator boards.
115 uh CT Hmmm....sounds like one side of a 455 KHz transistor radio IF
transformer.

"Good things dont come easy"
, Joe



-----Original Message-----
From: mike bryce <prosolar at sssnet.com>
To: Joe <joeamp at mindspring.com>; HEATH at listserv.tempe.gov
<HEATH at listserv.tempe.gov>
Date: Thursday, April 19, 2001 5:04 PM
Subject: Re: 5 KC AM filter project


>joe and all...sfd
>
>just wondered... is that really .56pf? Gosh that's almost none existant!
>could it really be just a plain ol 56 pf cap?
>
>what about that tapped coil? how you going to get around that one?
>--
>Mike Bryce WB8VGE
>SunLight Energy Systems
>"Electricity at the speed of light"
>
>> From: Joe <joeamp at mindspring.com>
>> Reply-To: Joe <joeamp at mindspring.com>
>> Date: Thu, 19 Apr 2001 17:02:12 -0400
>> To: HEATH at LISTSERV.TEMPE.GOV
>> Subject: Re: 5 KC AM filter project
>>
>> I did originally think about gimmicks but then wondered why it wasn't
done
>> originally by the contractor who built the heath filters.
>> I am going to try all of the suggestions and plot the filter curves.
>> I was concerned about spurs, or leakage with the larger twisted gimmicks
>> Thank everyone, will let you know what happens.
>> Joe
>>
>>
>

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