On 7/14/06 9:08 AM, in article , "Michael Black"
wrote:

K3HVG ) writes:
Ed, I think you'll find that its a bandpass filter centered on 455kHz.
The part about a "crystal socket" is a mystery..... You also need
to know what the loss and bandwidth is before considering it. Also,
does your particular application make accommodation for a filter (loss
compensation, et al). If not, you'll need to do some design work,
albeit simple.

Actually, I don't think it can be defined from the poster's description.
It could merely be a crystal, after all many an old receiver did use a
single crystal in a filter at that IF, and that would explain the "crystal
socket".

Either the Ebay description is suspect, if it can't explain things then
maybe the seller doesn't know what he's got, or it's been garbled when
posted here.

Michael VE2BVW



Ed wrote:
Please educate me. I see one of these for sale on ebay that plugs into a
crystal socket. I know that a lot of boatanchor IF's are 455Kc, does this
generate the IF for old receivers, or is it a bandpass filter?






I looked it up..... It is clearly just a crystal at 455 kHz. There are
three available. It could be used in a notch filter, a bfo, or to make a
simple 455kHz oscillator for boatanchor alignment.

Don