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From: "Phil Allison"
Subject: Re: Single wire FM antenna
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Date: Wed, 1 Jan 2003 15:36:47 +1100
NNTP-Posting-Date: Wed, 01 Jan 2003 15:27:52 EST
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"Kevin McMurtrie" wrote in message
> > ** 1000 ft range is not needed with a RC car since you cannot
> >control what you cannot see. A range of 150 feet is about normal. Your
> >is unlikely to be of 1 watt RF output either.
> Aren't you quite the troll here.
** No way Kevin - you have misread my post. The "150 feet" refers to
the range of good vision of a typical model car for a person with average
> 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.
** I own two Associated 10Ls used to circuit race them every weekend and
also sometimes run them on a 333 metre Olympic velodrome track. I know the
> Driving it in anyting less than a 300 foot radius was just tedious tire
** Bull. A 333 metre velodrome has steeply *banked* curves of 30 m
(100 ft) radius - the max speed before losing all traction was 85 kph or 53
mph. The operating range was not more than 110 metres. The banked track
helped vision enormously.
> 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
** Really - put a wire fence or similar behind it and try again ? At
1000 ft the car is a mere spec and *impossible* to control safely.
> The transmitter power for those is 0.25 to 0.75 Watts.
** That is the DC inout power - not the ERP.
> To the original poster, find out what the factory antenna length is.
> The receiver module is pre-tuned for _exactly_ that length.
** The antenna may not be tuned at all. Those that are tuned are
normally set up for model aircraft use with horizontal wires and no ground
plane. A vertical wire is normal on a car or boat and 1/8 wave at 75 Mhz is
Operating a fast R/C car or power boat at large distances is plain
bloody dangerous - you cannot set it properly and control is easily lost.
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