This is going to be a lot of fun.
I can get them delivered to the Philippines from China for $8 us .
Is any one building a kit we can buy that adds the filters etc.
Will be fantastic for WSPR.
Perhaps Outernet could use this as a back-channel on the 13.553–13.567 MHz 13.560 MHz ISM Band . Utilizing a sort of WSPR or similar low power protocol to send web addresses etc from remote Outernet users.
Being ISM any one can use ithe frequency without a license…
People with Outernet receivers could Monitor the ISM HF band using a RTL dongle in Q mode and a long wire. Listening for the 13mhz signal and then forward the request to outernet over the internet.
In Philippines using a RTL dongle and long wire I am picking up WSPR from Japan over 2-3000 km away all the time with WSPR reliably.
Its kind of what WSPR is doing now so I do not imagine a lot of code would have to be written
Here is a simple ISM transmitter I found.