[time-nuts] Old xtal filter

Dave Brown tractorb at ihug.co.nz
Sun Mar 6 17:04:01 EST 2016


Label sez B/W is actually 10cps or 10Hz, not 100. Could have been used in a 
carrier recovery scheme in a DSB/ISB receiver. These typically had three IF 
filters, one for carrier recovery and one each for USB and LSB.
DaveB, NZ



----- Original Message ----- 
From: "Joseph Gray" <jgray at zianet.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Monday, March 07, 2016 8:31 AM
Subject: [time-nuts] Old xtal filter


> Assuming I made the pictures small enough, attached are two images of
> an very old crystal filter that a friend found. The strange thing
> about it is the bandwidth - 100 Hz. What could this have been used
> for, with such a narrow bandwidth?
>
>
> Joe Gray
> W5JG
>


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