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Conference vmszoo::rc

Title:Welcome To The Radio Control Conference
Notice:dir's in 11, who's who in 4, sales in 6, auctions 19
Moderator:VMSSG::FRIEDRICHS
Created:Tue Jan 13 1987
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1706
Total number of notes:27193

166.0. "flight packs --- airborne radio subsystems" by EARTH::SCANTLEN () Tue Jun 02 1987 13:21

    I installed a Tower Hobbies Mini Flight Pack in one airplane a couple
    years ago, and used my Futaba as transmitter, with no problems.
    It is possible that if you have no problems with the original receiver,
    that the transmitter is 'out of tune' with respect to the Mini Flight
    Pack.  Typically, the transmitter is tuned, and then the receiver
    is tuned to match the transmitter output for peak signal reception.  
    If the original receiver was 'mis-tuned' due to a transmitter set 
    up away from nominal, then an apparent incompatibility would exist
    with another flight pack, when in reality it was really the
    transmitter at fault.  
    
    In the case where you buy a replacement flight pack, the receiver
    is tuned to 'middle of the road' where it should work well with
    all equally tuned transmitters of the same frequency and modulation
    technique.  
    
    In any case, don't attempt to retune your transmitter, (RF section),
    as without proper equipment and license (at least in the States),
    its not allowed.
    
    
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166.1Tune it up!CRVAX1::KAPLOWThere is no 'N' in TURNKEYTue Jun 02 1987 14:2921
        The only thing I've ever built where micro servos wouldn't hack it
        was an RC car. The micro servo just didn't have the torque for the
        steering. Standard (cheap) Tower servos now work fine.
        
        Forgot all about tuning, and I should have mentioned it in my
        earlier reply. As a matter of fact, we did have to tune my friends
        mini Tower RX to match his Futaba TX. Untuned, it had the short
        range you mentioned. Once tuned the antenna down range was farther
        than the yard length. We did it in my yard, to avoid all the metal
        in the house, and the biggest problem was seing the scope face in
        the bright sun. It isn't too hard to do; I will see if I can find
        the instructions I have, and post a note on RX tuning. Scopes can
        be borrowed from your friendly local F/S person. 
        
        As was mentioned earlier, you must have an FCC license to tune the
        transmitter. If you have a ham license, and use the 50MHz RC
        channels, you can tune those yourself (I do). The simple solution
        is to not mess with the transmiter (unless it has a problem), and
        tune the receiver to the transmitter. This is the only way to do
        it when you have more than one flight pack that you use with the
        same transmitter.