receiver aerial length
10-27-2002, 05:00 AM
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receiver aerial length
Despite what is often thought, R/C Rx's are NOT based on traditional 1/4 wavelengths. Regardless of operating freq (27Mhz, 35Mhz, 40Mhz, 50Mhz, 72Mhz), Rx aerial lengths are based on convenience. Generally, 39 to 41 inches is popular on the aircraft channels. Ground vehicles can be much less.
It will do more harm to use wavelength calculations since the factory adjusted impedance matching will no longer be optimized.
If yours is a USA Rx, then the length will be about 41" total, including the part you cannot see that is soldered to the PCB. If you are using another RF band then consult with JR for their recommendation. Or, just hang 41" on it and ground test. The results will speak for themselves.
It will do more harm to use wavelength calculations since the factory adjusted impedance matching will no longer be optimized.
If yours is a USA Rx, then the length will be about 41" total, including the part you cannot see that is soldered to the PCB. If you are using another RF band then consult with JR for their recommendation. Or, just hang 41" on it and ground test. The results will speak for themselves.
10-27-2002, 05:01 AM
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receiver aerial length
I believe all 72 MHz receivers use a 39 inch antenna. All you need to do is cut a piece of multi-strand wire (for flexibility) of an appropriate gauge and solder to the antenna terminal inside the receiver.
10-27-2002, 05:02 AM
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receiver aerial length
Contact Horizion customer support they can advise you on the correct length. Radio shack has spools of wire for less than a replacement antenna.
