What crystal frequency?

[JEB123]

I know this is a radio question, but I didn't know what type of radio the Axe CP uses. I think it's made by Hitec? Anyhow, my radio is on channel 36, 72.510Mhz. Does anyone know if the crystal is an overtone or is it multiplied up in the Tx/Rx? I need to replace my Rx which doesn't work, but I don't know if the xtal may have been fractured in a crash and may actually be the problem. I have some xtals here at work, but I don't know the actual xtal freq. I don't think it would be a fundamental or inverted mesa, it would be too thin and fragile or too costly. I don't recognize 14.502 as a standard freq.

[JEB123]

Where's all the engineers when I need'em?

[JEB123]

C'mon, HFG, you have to know this!

[dditch66]

I can only say that it is not worth the effort to go on your own to get the xtal that may fail you in flight.
They don't cost that much. They are somewhat specialized from what someone once told me. If you REALLY need to know, your gonna probably have to dig around on the internet for information, otherwise keep waiting.

[JEB123]

Hey, thanks for your reply, but that someone who told you that was misinformed. There are no specialized crystals. There are different cuts of crystals that have different frequency vs. temperature curves, and they either operate at series or at parallel resonance. Series crystals are more often used for greater frequency pullability in VCXO's at the expense of worse stability over temperature. They appear capacitive in nature and require an inductor in series with them to bring them to nominal frequency. Parallel load crystals are used in clocks and other higher stability devices, and is likely what is used in RC transmitters. They appear inductive and require a capacitance to bring them to nominal frequency. Quartz crystals typically will only fail if struck hard enough and are fractured, by overdriving them with too much power, or if overheated which can melt the conductive epoxy mounts. I can get a crystal sold by a hobby dealer at $15.00 for about 40 cents from Digi-Key, or other electronic supplier.
I worked for a quartz crystal manufacturer and vcxo/tcxo manufacturer for over 5 years, including a 10K clean room where we mounted and tested open blank crystals. I will do my own testing with a scope to see at which freq it is running. I already repaired my Axe, but we technical people are just curious that way.