How to Create a Linear Transponder using a RTL Dongle and HackRF with Gnu Radio.

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 Test the concept of a linear Transponder and how difficult would it be to build it with conventional components.

Low cost APRS !!

I had no transmitter module, to test my new Arduino sketch except the low
cost JMR-TX1 module. For my surprise it works like a charm and succeeded
to transmit packet frames without missing any,  just like a robust FM transmitter
module !!! .
On spectrum analyzer I noticed a lot of noise, but a simple output filter can
boost using of this cheap  low power module for more lab and field experiments.