If you do decide to use those crystals, please tell the other flyers at your field before you go up. This may give them a chance to run for the hills in the likely case it comes down after receiver failure. After all, you will never know where it will land, and that could be on top of someone or something very expensive.

As Ken suggests, stick with the manufacturer's crystals that belong in the receiver. And NEVER.. EVER swap out transmitter crystals. That is not good for the same reasons as above, AND it is illegal.

CGr.