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First 24hrs with Raspberry Pi and WSPR

posted Aug 25, 2013, 10:12 AM by JERRY DUNMIRE   [ updated Aug 25, 2013, 10:29 AM ]
It works! I have a Raspberry Pi transmitting WSPR and it has been heard.

Map from WPSRnet

Using WsprrPi is easy- to transmit on three different bands in rotation with frequency calibration using NTP  the command line I used is:

$sudo ./wspr -r -s KA6HLD CM97ai 10 20m 30m 40m

The set up is cobbled together and strung out over most of my shack. I used the JamesP6000 version of the WsprryPi program, a low pass filter from Kits and Parts dot Com that I analyzed in the  RF Filter for a Raspberry Pi Transmitter exercise, and my MFJ Multi-band vertical.

The vertical is not in good shape (broken counter poise wires and other problems) and I didn't check the SWR. Still, the 10mW signal from the Raspberry Pi was heard on 2 bands by 4 different stations. W0AY, on 30m in Montana, recorded the most reports (63) over the first 24 hours. Reports on 20m were from N0HAV, K0SQL53, and  the distance winner (2041 km) VE6PDQ.

This has been great fun and I recommend that anyone with a Raspberry Pi and an Amateur Radio license give it a try.

Next I need to look into WSPR reception...