[time-nuts] Old xtal filter

[Will Kimber]

Hi,

Is that 100Hz por 10cps?  Seems like a CW filter for a 100Khz IF - Ex 
500Khz Marine RX?

Cheers,
Will

On 07/03/16 08:31, Joseph Gray wrote:
> 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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