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From: Kevin McMurtrie
Subject: Re: Single wire FM antenna
User-Agent: MT-NewsWatcher/3.2 (PPC Mac OS X)
Date: Wed, 01 Jan 2003 03:52:05 GMT
NNTP-Posting-Date: Tue, 31 Dec 2002 19:52:05 PST
In article ,
"Phil Allison" wrote:
>"mook johnson" wrote in message
>> I have an FM receiver (75MHz) that has an antenna tuned to approximately
>> of the wavelength of the carrier.
>> From what I've read, 5/8 would be better.
>> This receiver only needs to work over a short range (~1000 feet max) with
>> fairly strong transmitter nearby (~1 watt).
> ** 1000 ft range is not needed with a RC car since you cannot effectivly
>control what you cannot see. A range of 150 feet is about normal. Your Tx
>is unlikely to be of 1 watt RF output either.
Aren't you quite the troll here.
75MHz RC systems are commonly used for 1/10 scale race cars. I used to
have a super-modified Tamiya Falcon that did 40 to 50 MPH. Driving it
in anyting less than a 300 foot radius was just tedious tire burning.
It had a range of 900 feet at full throttle and over 1000 feet at light
throttle. (I checked my favorite driving spots on Mapquest to get the
The transmitter power for those is 0.25 to 0.75 Watts.
To the original poster, find out what the factory antenna length is.
The receiver module is pre-tuned for _exactly_ that length. Some
companies will re-tune and match a transmitter/receiver pair for a small
fee. 1000 feet is doable.
Do a Google search for RC hobby web sites.
>> This is for an R/C car controller
>> Could someone explain the performance differences between 1/8,1/2 and 5/8
>> wavelength single line antennas?
> ** Make the Rx antenna longer if you like but why do you want extra
> .............. Phil
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