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Old 03-30-2004, 05:01 PM   #1
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length of Rx antenna

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I lost a few inches of my JR Rx (NER 327X) antenna FM channel 46 (72.710). My other Rx (R700) (same frequency) is 38 3/8 inches. Is it safe to make the other the same length? How critical is the Rx antenna length? I was flying with the shorter Rx length and it worked OK (two different JR Tx) but was a little concerned about flying to far away. Any comments would be appreciated.
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Old 03-30-2004, 07:24 PM   #2
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I guess it depends,... not trying to be a smart A$$ here, but how much is a few inches? I'm thinking all 72MHz receivers should have the same length antenna...

I don't think losing an inch is going to make much of a difference...cutting it in half almost certainly will make a difference... where the dividing line between the two is, I honestly don't know.
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Old 03-30-2004, 08:43 PM   #3
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I read somewhere that the antenna should be one meter long. might have been on RCU - Dan Snyder the JR rep.

I have an NER 627x, and it is one meter. - It just came back from service
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Old 03-30-2004, 08:58 PM   #4
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As a former Signal Corps Radio Tech I can assure you an inch or two would not make a lot of difference. (It's a percentage thing) That being said, these little gizmos are tuned pretty well, so they will work best at their proper length. Now I have noticed that the Futaba low band Rx's have their antennae a tad longer than the high high band ones. But if you go with the one metre length, you will b so close it wont make any diff. Just don't cut it in half or add 50% that will really mess up the tuning.

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Old 03-31-2004, 06:12 AM   #5
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Hi Dennis,

you mentioned that you "lost" a few inches on the antennae. Was it snagged somewhere, did it get ripped, cut etc etc? If that happened make sure that the connection to the receiver is still solid and not frayed from the tension.

Just something worth checking

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Old 03-31-2004, 08:09 AM   #6
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The antenna had a small plastic strain relief fitting to hook it to a rubber band and then to the rudder. It flexed so much in the breeze that it broke off at the plastic. All I lost was about three inches. I soldered a piece back on to make it close to the same length as my other rX. I am pretty sure it will be ok, but want to be sure. I think I will put a new antenna on it when I find the proper wire.
Thanks for the info.
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Old 03-31-2004, 01:09 PM   #7
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IMHO, 3 inches is too much. Either repair it, or replace it. If you fly close in you probably won't have a problem, but if you drift too far, by intent or accident, you may have an unguided missile. It will also make your set up more susceptible to interference from stray RF noise.
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Old 03-31-2004, 01:30 PM   #8
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Hopefully, you do occasional range tests.
If your range test shows about the same range as before, don't worry about it.
If it is less, then it should be repaired.

By the way, soldering a piece of similar wire to the end to make the antenna approx the same length is was before is an acceptable repair.
If you have done that, you need not worry.

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