Thanks, Ted. Both links were useful. It's comforting to know that I'm not the only person this has happened to.

I think my old Hitec rcvrs have drifted off frequency and I'm not going to use them. Considering how old they are and how much smaller new rcvrs are, I am not going to attempt to have Hitec repair them, I will just replace them. I bought an inexpensive 2.4 Ghz radio (Airtronics) and I'm going to try it with my handlaunch gliders. If it works out, I will probably abandon my 72Mhz radios and switch over to 2.4Ghz.

Thanks for the info.

Cheers,
Ann T.

late reply, but found this - maybe you could send them in to Hitec?
http://www.rcgroups.com/forums/showthread.php?t=758021

if you need replacements, consider these:
http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=6406
very cheap, and work on any channel. getting it to find the frequency sometimes takes several tries, but once it locks in it seems permanent. none have gone unlocked so far after two years, and range is twice that of my crystal receivers, typically 75m+ with the antenna down.

Hi Ann,

I don't have any root cause ideas, but unless you can find something definitively wrong with each of the 3 that does not exist (yet) on the other one, I wouldn't risk using it. Given the relative value of the model to the Rx and the safety implications, I would say it isn't worth it.

Andy

Sorry, I meant Hitec 535 Rx's - not 555's.