The modulation was the same on most post 1965 transmitters, but the frame rate, and neutral pulse width did vary on some models. 1.5 milliseconds and 1.7 milliseconds was used for the neutral pulse width, hence some servos will not quite center, but you can adjust the servo feedback pot to solve this.

On the AM stuff, as mentioned above, a pulse reverser like Ace, Royal, and McDaniels sold works fine. My servo cycler has a reverse pulse switch too.

The F&M Digital 5 had Digimite servos, failsafe type, Bonner circuit boards, I have one. There are 32 little balls in there, take it apart in a shoebox, or spend hours looking for them....... Yes, they are real slow. A split supply of plus and minus 3 volts(6 volts total) helps a little. The Bonner 4RS had 4 wire plastic cased, harmonic drive servos, but they too were slow. I had one recently, NIB, but sold it on eBay as it was just too flakey to deal with.

Sorry, I got confused, it is on FM receivers that the modulation pulses get reversed with high, or low side crystals....too many types of radios and I get crossed up!!

I should have know the difference between a Slylane and Skyhawk...having flown them in flight school, but I guess I'm slipping, there is no future to this old age thing!


The Sampey 404, and the earlier Astronics had a "start" button to kick off the ring counter, pretty crude but it was state of the art back then.

I heard recently that Bob Dunham had a little Taiwanese honey on the side, she worked at that bar in Garden Grove. He used to make alot of trips to the orient....hmmm, what was he up to??