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2.4 antenna

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J

jimc

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how critical is the length of the antenna? this is the situation. Bought a used sav 5.9 that looks and runs great but has sporadic glitchin. Guy at LHS said the antenna wire looked as if it was torn/shortened. I took the reciever out and put back in and I noticed that the wire was too short to reach the top of the antenna tube. I assume that it should reach the top?? anyway, LHS guy said these antennae are tuned to a specific length that and may cause problems if shortened by even a quarter inch. Maybe I am missing an inch or so and am wondering if this is a factor/cause for my glitch issues?? Any ideas fellas?
 
Which receiver make and model is it? On certain Spektrum receivers, it is ok to cut down the antenna to a specifc length. On the spektrum micro receivers they are already really short straight from the factory.
 
not sure of make and model, it's the stock 2.4 that came with sav5.9 about 6 mo ago. stock radio and reciever that is.
 
All signs point to be, it may be too short. You can always solder a new wire in if you know how or have the supplies, when i last did my wire, i soldered in a long wire, longer than the tube, and actually tied one loop at the top of the plastic tube to keep the wire from pulling back through, and also had a little extra in the receiver box before tying it, and have had no issues, also put a small rubber cap on the end of the plastic tube, covering the small knot i tied, because of the extra inside the receiver box, i can pull the wire up through the tube half an inch or so, so there is some play, mine is a micro receiver. I would think, that longer is better, so i would start with long and go down from there, if I'm correct it is when the wire is too short that it causes problems. :)
 
NitroArsenal said:
All signs point to be, it may be too short. You can always solder a new wire in if you know how or have the supplies, when i last did my wire, i soldered in a long wire, longer than the tube, and actually tied one loop at the top of the plastic tube to keep the wire from pulling back through, and also had a little extra in the receiver box before tying it, and have had no issues, also put a small rubber cap on the end of the plastic tube, covering the small knot i tied, because of the extra inside the receiver box, i can pull the wire up through the tube half an inch or so, so there is some play, mine is a micro receiver. I would think, that longer is better, so i would start with long and go down from there, if I'm correct it is when the wire is too short that it causes problems. :)
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Longer is not always better, (in this instance). The length of the antenna is tuned to the freq the radio works at. It would be best to look up the specific RX and find out what the original lenth and gauge was, then replace it with an exact match.
 
That is interesting information....for years now i have just slapped a wire in, being the same gauge, and made it slightly longer than the plastic tube...nice to know, I'm going to check that out what if my system is not up to its full potential?? lol... :)
 
thanks guys, I am actually sendin radio and rec back to HPI along with motor, due to air leak. I will relay this question to them and post outcome, prolly bout two weeks from now. Best regards, Jim C
 
I would hope to not have to seal the motor when I get it back from them because it is being sent back specifically for an air leak. I'd have a serious issue with that. I will check it tho for sure. There was such massive air leakage from the front bearing that I did'nt even look further. I guess I'll have to see wether they repair or replace, there was no hesitation on the part of HPI in telling me to send it back so I guess thats encouraging. I will be sure to update all.
 
air leaks from the backplate and carb are common. air leaking from the front bearing is totally different. the bearing is probably bad. That is why they said send it back. good luck!
 
Sealing engines is par for the coarse. No good reason not to. Not sealing an engine is taking too much of a chance for how simple of a procedure it is. Take an hour to seal it or or chase the tune and over heat it? Easy choice.
 
Unless the RX sends information back to the TX, a longer antenna for receiving will not hurt anything. A long-wire antenna (10 meters long or more) can be used for receiving anything 1 kHz to 450 MHz without any problems. The only time that antenna length really matters is when you are emitting or transmitting RF energy.
 

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