Citizen ship radio
01-02-2014, 01:12 PM
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Citizen ship radio
Hi to all .I have a model transmitter APT 3 channel on 27.095 and would like to know if there would be a receiver with a crystal lying in someones radio department as i would like to get it going .also what dose APTstand for .looking forward for some help ......john
01-02-2014, 03:13 PM
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APT stands for Analog Proportional Transmitter. Unlike my Citizen-Ship DPT (Digital Proportional Transmitter) it will not work with a modern AM receiver. I'll let Jaymen and Grotto go into analog systems, because I have no working knowledge of them. Best to you and Good Luck!
Russ Farris
Russ Farris
01-03-2014, 04:02 PM
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I'd say the go to guy on this would be Jean-Marie Piednoir, who goes by JMP_blackfoot. He has worked some with analog servo design some years back, and we kicked around the idea of adapting a HPI RF-2 receiver to build the airborne around. That is actually a Futaba design, for 27 MHz, the thought being that after it receives the RF signal, you tap into the audio output and build the necessary filters to drive analog servos.
The C-S analog sets from around 1965-66 were actually very fast GG sets in the way they transmitted data (pulse width and rate changes controlled rudder and elevator, while turning off the pulse caused low motor and full on ran the motor to full). When making a throttle change, the rudder and elevator moved to neutral, so fail save (loss of signal) drove the throttle to low and centered the controls. The RF link seemed to have some weakness, so as long as you flew up-wind, and high enough all was good.
The C-S analog sets from around 1965-66 were actually very fast GG sets in the way they transmitted data (pulse width and rate changes controlled rudder and elevator, while turning off the pulse caused low motor and full on ran the motor to full). When making a throttle change, the rudder and elevator moved to neutral, so fail save (loss of signal) drove the throttle to low and centered the controls. The RF link seemed to have some weakness, so as long as you flew up-wind, and high enough all was good.
