[arm-allstar] Building an inexpensive node transceiver using the SA818 module

[harry]

Thanks Doug,

 

Happy New Year

 

Harry 

KC4RPP

 

From: arm-allstar-bounces at hamvoip.org
[mailto:arm-allstar-bounces at hamvoip.org] On Behalf Of Doug Crompton
Sent: Monday, December 29, 2014 1:27 AM
To: arm-allstar at hamvoip.org
Subject: [arm-allstar] Building an inexpensive node transceiver using the
SA818 module

 

I put together a how-to on my project to build a simple and inexpensive node
transceiver using the SA818 VHF/UHF transceiver modules. Here is the link to
the project. This link is also on the hamvoip.org web page.

http://crompton.com/hamradio/818_transceiver_module/

This is probably not a project for the beginner but it should not be too
hard for those that have been building for awhile. Please read the cautions
and comments I have made about the module. This is a cheap Chinese module
intended for "Walkie Talkie" applications and at less than $15 for the
module it isn't going to be a $150 or more Japanese rig. Pay particular
attention to the output spectrum of the module. They do NOT meet FCC specs
without an output filter. Using it without a filter on a dummy load should
be OK and would work in a limited local area. With a filter, as described on
the web page, it works fairly well for a local limited distance node. I have
even built a local repeater using two modules which is also shown on the web
page.

Chris, W0AMN has written a Python program to program the module which can be
done very easily on the BBB with a USB to serial adapter. You can download
the program now and it will be included in the next BBB Allstar release.
Details are on the web page.

Have Fun es Happy New Year!    

73 Doug
WA3DSP
http://www.crompton.com/hamradio

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