I have 4 airtronics transmitters.
RD8000 (2.4 GHZ)
RD 60000 (72 MHz)
Infinity 600 (72 MHz)
TD5g (2.4 GHZ)
Since Airtronics is out of business I can no longer get receivers UNLESS someone can help. I am OK on the 72 MHz because I have a bunch of coronas synthesized rcvrs.
BUT would really like to convert the Infinity to 2.4 but cannot find good info. If I could do that I would get rid of the 5G and 8000.
The hope is I could convert to Spektrum protocall.

You can Google Sanwa and find their web site. Also, Desoto Racing down your way has Airtronics equipment and is , in fact, the distributor for Airtronics ( Now Sanwa) radio gear. Good luck. I use Airtronics radios myself.
Frank

I have two Infinity 660s and would give an arm and a leg to convert them to
Airtronics FHSS1
Please say someone does this
Thanks

You can mod it to transmit in 2.4GHz but not what you want in fhss1. They never maked a module for the older transmitter. And even the Chinese never make one for it.
2.4GHz DIY chinese kits that I know still can get easily are Corona and Lemon.
or if you good at soldering, could transplant a low end fhss1 rf board to the 660.

Nothing wrong with using 72MHz, still some new old stock out there, you can get a new synthesized (no crystal needed) 8 ch receiver from China. Or Ebay.
https://www.ebay.com/itm/Corona-RP8D...-127632-2357-0