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Re: Extend Range

Subject: Re: Extend Range
From: "alarman" <alarman2000@xxxxxxxxx>
Date: Sun, 16 Oct 2005 18:35:52 -0700
Newsgroups: alt.security.alarms
References: <zO6dnbHgY5KvnMzeRVn-vw@xxxxxxxxxxx> <U7D4f.2468$4O1.2194@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>

"bdolph" <bdolph@xxxxxxxxxxx> wrote in message
news:U7D4f.2468$4O1.2194@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Many years ago I used to make a dipole to extend the range of these
> transmitters.  I could get them to transmit across a street to another
> house.  It must be the correct dimensions and trimmed to the
> transmitters frequency.   Somebody as linear may have the dimensions to
> build this.  Let us know if you find them.

wavelength in meters = 300 / frequency in MHz

A 433 MHz transmitter has a wavelength of .6928406 meters, or 27.270206
inches. You HAM guys can check my math, but
theoretically, you could make a quarter-wave antenna of approx. 6.82 inches.

js

Follow-Ups:
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References:
- Extend Range
  - From: Rich
- Re: Extend Range
  - From: bdolph

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