Determining Q-switch operating frequency

[Stoney3K]

Not all AOs are ISM, some piggyback on frequencies used for other services. Xerox AOs from printers are right in the heart of the Air Navigation bands.
So I go out of my way never to run a xerox driver without a load to adsorb the RF.

That's the 110.000 MHz frequency, used for VOR navigation and ILS localizers.

Fortunately, it's not going to harm any aircraft unless you squeeze it into a directional antenna. Aircraft receivers aren't going to pick it up unless you transmit the 30Hz subcarrier used to determine the bearing to the station.

[mixedgas]

That's the 110.000 MHz frequency, used for VOR navigation and ILS localizers.

Fortunately, it's not going to harm any aircraft unless you squeeze it into a directional antenna. Aircraft receivers aren't going to pick it up unless you transmit the 30Hz subcarrier used to determine the bearing to the station.

--------- Yeah, I know, not much harm, but I still warn folks not to leak em-----------

Depends on which Xerox AO, I have the older ones and the newer ones.
The newer ones stay on ~110 with say 250 mW. No issue.
The older ones tune 110 to 128 with a "TRIM" input used to vary the deflection angle by changing frequency. They have a prism milled into the AO crystal, and if you can get six feet of bounce into your projector with mirrors, by turning the trim 10 turn, you can pick out argon lines one at a time. Those go well into the Aviation voice range and have 1 watt of RF, which is significant if they ever were coupled to a good antenna.

In the intended use, they are remarkably close to VHF Guard when running!

Steve