The answer depends on the use the crystal was designed for, but some were receiver crystals with the offset you cited. Some crystals are "channel" crystals & you have to do a little research (or testing) to find out what the crystal actually oscillates at. Many channel ones are also marked with the actual crystal freq & some are marked for their application; e.g., "BC-669 Trans" etc.
Some operated at fundamental. Some at harmonics. It's a mixed bag.

Wayne

WB4OGM

On Monday, July 31, 2023 at 07:29:52 PM MDT, Glenn Little WB4UIV <[email protected]> wrote:

Are the frequencies on the crystals channel or crystal frequency?
If channel frequency and receive crystal, the crystal frequency could be a by offset by an if frequency and a multiple of the crystal frequency.

Glenn
WB4UIV

On 7/31/2023 3:12 PM, Paul Thekan wrote:

Thanks again to all that responded to my post yesterday for info on crystal mfr's during the war.

As I slowly go througj the pile of xtals here...I'll be happy to keep a look out for any non ham band freqs you may want. So far out of 350 xtals looked at , only two 40 mtr xtals were found.

So far the highest freg found is around 8mcs. The bulk so far is around 5 -6.9 mcs and others in the 4mc range.

Also have quite a few DC 34 xtals as used on the BC669 , these all in the 4 mc range.

Let me know what you your looking for.

Paul

N6FEG

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Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            [email protected]    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
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