NNTP-Posting-Date: Sat, 11 Jan 2003 14:57:36 -0600
From: Barry Lennox
Subject: Re: Pet Locator Design Help Needed
Date: Sun, 12 Jan 2003 09:59:50 +1300
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On Sat, 11 Jan 2003 16:24:30 GMT, WildOne wrote:
>Thanks, I think that is one of the first things I'll do, get something
>to get me a little more familiar with the fundamentals of the task at
>hand. I will check out Amazon and see if they can get it.
I see I bought my copy from Barnes and Noble for $55.
>Please don't go out of your way, but if you happen to run into them I
>would be interested, as long as the technology is not so old you can't
>get parts anymore I don't think I care that it's old or new.
Well, I found them quite quickly. The SA article was the "Amateur
Scientist" column in March 1968, it uses transistors which are no
longer available, (ever heard of a FK913?) but there's many suitable
The other article is an extract from the "Mammal Review" Vol 8 Number
4 of Dec 1978. It's 24 pages and has a lot of good info on small
transmitters. They use Zetex transistors (which should be still
available if you wanted to use them) and micro-minature, but not SMD,
parts. This has a very good section on DF antennas (Adcock and Yagis)
tracking and triangulation methods. A university library should be
able to get a copy.