Can an FM Xmitter control an AM receiver ?  
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> Can an FM Xmitter control an AM receiver ?
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Can an FM Xmitter control an AM receiver ? - 3/8/2008 7:44:04 PM   
Skitimberlake


 

Posts: 15
Joined: 12/7/2003
From: Herndon, VA, USA
Status: offline 		Hi. This is an education question. Being stumped on this game of Are you smarter than a 5th grade RCer, I want to peek at RCD-Hitec support's answer.

Background - Recently was testing an older RCD receiver for use in a small sport flyer for a friend & student flyer. Receiver is RCD Platinum Model number PGP 21AM. It is dual conversion, ultra narrowband. (I did not notice the AM designation.)

To test, I hooked it up in shop (not in aircraft) with battery & 4 servos. ch 48. Proceeded to test it with an FM transmitter on ch 48. Found that all servos worked. No bleed over, all servos worked independently like they should. I noted the system was susceptable to antenna location and movement. Antenna could not be anywhere near the servos or lots of glitching happened. And if Rx antenna was moved, glitching occurred during movement, especially if reasonably close to servos.

These tests done in shop, Xmitter & Rx were close to each other. no range test done. But when antenna routed away from servos (sometimes difficult to do in fuselage environment), servos worked OK'ish.

In looking at the receiver to figure out what was going on, I then noticed the AM designation. PGP-21AM. Also on front in small print " Fut 'J' 72 MHz AM ". I assume the AM designates the modulation scheme and this receiver is AM ? Assuming this is an AM receiver, then:

Question - how & why could my low end Futaba T6As FM transmitter control it ? Also a Futaba skysport FM 4 channel "plain jane" non computer radio was able to control it as well.


Like I said, this one is just for educational purposes. I am definitely not smarter than a 5th grade RC'r... hence the peek.

Thanks

RSH

aka Skitimberlake
       Post #: 1

RE: Can an FM Xmitter control an AM receiver ? - 3/10/2008 6:43:27 PM   
MikeMayberry



Posts: 2800
Joined: 1/15/2002
From: Poway, CA, USA
Status: offline 		It's not uncommon for this to occure at short range.

Mike.

_____________________________

Hitec RCD Rep
http://www.hitecrcd.com

(in reply to Skitimberlake)
       Post #: 2

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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> Can an FM Xmitter control an AM receiver ?
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