[Collins] Filter I.D.

[David Pritchard]

Hi Jerry,

Thanks for the info and quick response. The other Web resources that 
were suggested did not have this part number listed.

These are, indeed, plastic case filters with no mounting studs. Given 
the source I obtained them from, it is likley they were used in a FDM 
microwave network. It seems as though they may be too wide for Ham 
applications, but if anyone is interested, let me know.

Dave
W9QL


----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at weather.net>
To: <collins at mailman.qth.net>
Sent: Monday, March 28, 2011 11:27 PM
Subject: Re: [Collins] Filter I.D.


> 2.8 Khz bandwidth is a good guess except for the Z filters. There the
> last digits don't show the bandwidth. Often in the Z family the
> frequency is carrier for SSB and the numbers refer to a list of Z 
> family
> filters. Like Z4 and Z5 are USB and LSB 3.3 kHz filters for 455 Khz
> carrier frequency. Any other letters in that position signify the 
> case,
> but not the Z filters, some early Z filters are in a C case, some are 
> in
> a Y case.
>
> Found a sheet dated October 1983 in my Collins folder. It says a
> 526-9698-010 is: 455 kHz carrier frequency. 3.30 kHz 3 dB bandwidth,
> 4.80 kHz 60 dB bandwidth, 2K source and load impedance for USB in the 
> FD
> case. The FD plastic case is the same size and connections as the FA
> that came out in the later S-line gear, but without the threaded
> mounting studs. This chart doesn't list the model numbers, just the 
> part
> numbers and the very condensed specifications. About 141 different
> filters for 450, 455, and 500 kHz. And only Disk-Wire types, not 
> torsional.
>
> 73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association
>
> On 3/28/2011 3:18 PM, David Pritchard wrote:
>> Hello,
>>
>> I recently came into a number of older Collins mechanical filters. 
>> The
>> P/N is 526-9698-010. Some of the filters are also marked F455 Z 28F. 
>> The
>> dates codes are all 1977 - 1978. I have no way of testing the filters
>> but am guessing they are 2.8 Khz. wide IF filters. The part number 
>> does
>> not show up in any Collins literature I can find.
>>
>> I'd appreciate any information anyone might have about exactly what
>> these filters were used for.
>>
>> Dave
>> W9QL
>>
>>
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