AVR-Chat

----- Original Message ----- 
From: "Jim Wagner" <jim_d_wagner@applelinks.net>
To: <AVR-Chat@yahoogroups.com>
Sent: Wednesday, May 02, 2007 10:32 PM
Subject: Re: [AVR-Chat] Re: AM transmitter or receiver


> Half mile in hilly wooded area is a bit of a challenge with
> low power at ANY frequency. Trees tend to absorb pretty
> well.
>
> Problem with low frequencies is that there  is a lot of
> interferance. Problem with medium and higher frequencies is
> the terrain loss.
>
> AM won't gain you much. Its simple and there are lot of AM
> chips and modules out there, but they are generally good
> for a few hundred feet, max. FM and other modulation modes
> all have disadvantages along with the advantages.
>
> You might try building a net of zigbee modules though I've
> heard that zigbee networking may not be ready for prime
> time.
>
> Get yourself a ham license (no morse code now, exam is
> pretty simple). Then you can use a 25W transmitter or more
> with ax.25 packet and you will have an off-the-shelf
> solution. It would handle your half mile easily. Modems are
> readily available and you only need to feed ascii in and
> get ascii out. For this purpose, you could even get used
> radios (cheaper) because it does not take a lot to make
> this work.

I don't think that would be a legal use of amateur radio. It wouldn't be 
legal in the UK, at any rate.

Leon
--
Leon Heller
Amateur radio call-sign G1HSM
Yaesu FT-817ND and FT-857D transceivers
Suzuki SV1000S motorcycle
leon355@btinternet.com
http://www.geocities.com/leon_heller