[FoxHunt] ARDF Xmitter
Jack Smith
[email protected]
Tue, 1 Oct 2002 21:33:49 -0500
I might look into the commercial HTs if I can ever get to a hamfest... I've
been a ham for 8 years, and I've either had to work, or been out of the
country for every one of them that's ever been withing 300 miles. Go
figure!?!
But, since I do have some ICS 501s, I'm gonna break down and finish that
project... one day...
Jack KE4LWT
-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Kuon & Dale Hunt
Sent: Tuesday, October 01, 2002 8:39 PM
To: [email protected]
Subject: Re: [FoxHunt] ARDF Xmitter
>Jaques,
>
>Do you have any plans to come up with another ARDF Xmitter that doesn't use
>the now hard to get ICS chips?
>
>Jack KE4LWT
Digi-Key carries Epson SG-8002 programmable oscillators for
less than USD 3.50 each, custom programmed to any frequency from
1 to 125 MHz. Yes, I know, this doesn't cover 2m, but it if you
get it around 48 MHz it should be rather easy to extract the
third harmonic. These are one-time programmable, and the fourth
pin can be specified as either active-high or active-low, so
you can key the oscillator different ways. There is no
obvious way to FM modulate the oscillator (though you could try
modulating the B+ and see what happens) so you might need to try
phase modulation... or CW, or AM, etc. This would be a good
start for a transmitter.
Otherwise, crystals that multiply to 147.456 MHz are quite
common: 8.192 MHz (x18), 12.288 (x12), 16.384 (x9), 18.432 (x8),
etc. You can try one of the WB2HOL designs, or just plug one
into an old crystal-controlled commercial HT, which are often
available cheap at hamfests.
- Dale WB6BYU
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