[OZAPRS] Sending Data over Rf modules
Andrew Rich
vk4tec at people.net.au
Sat May 26 07:22:06 EST 2007
Gudday
I have been the last few weeks playing with low power tx modules and
sending
GPS data.
Here are some observations:-
1. OOK or on off keying of the transmitter works ok but a logic 0 shud be
TX
on. 1200 baud
2. Radiometrix modules will do up to 64kb/s
3. Video sender modules and audio is also another option.
In sending of data, I found out the hard way you need
1. Preamble to let the rx settle
2. Manchester encoding or bit ballanced transmissions.
Here is a photo of the modules I am playing with.
http://vk4tec.no-ip.org/rf_modules.jpg
The next challenge is bit bash data transfer with manchester encoding and
decoding.
Regards
Andrew Rich
VK4TEC
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