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RPi as WSPR Beacon
02-08-2015, 07:50 PM
Post: #1
RPi as WSPR Beacon
In looking at Ham Radio software to run on my old (Rev A) Raspberry Pi, I came accross this:

The site decribes a simple program that sets up the RPi to output HF frequencies on one of the General Purpose I/O pins. It then modulates that frequency in the pattern used by the digital mode WSPR (another mode developed by Joe Taylor, K1JT). The really cool thing is that you don't need to connect the RPi to a transmitter, the RPi IS the transmitter! It modulates the pin at the band you need, at a 3.3V square wave. It is up to user to low-pass filter the signal and connect it up to an antenna. That's all that is needed to get on the air. Of course, it cannot receive, so this is purely a beacon. But, once it is running, you can check online to see if any other stations can hear you.

In my case, it only took about 10 minutes on 30 meters, but then I saw that a station south of San Francisco was picking me up. Not bad for a tiny computer board with a signal less than 10mW coming out an I/O pin. I plan on leaving it on for a while to see what I can get over a day or two.

For more information on WSPR, check out the main web site here:
To see the WSPR propagation map, look at this page.
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11-05-2016, 11:09 PM
Post: #2
RE: RPi as WSPR Beacon
Hello Bob,
I'm using github software on my Raspberry pi wspr beacon. I have some questions about the command line:
sudo .wspr (prefix)/(callsign)/(suffix) (locator) (power) (frequency)

1. What are the prefix and suffix and are they necessary?
2. in the example given, the locator had only 4 characters, I thought there are supposed to be 6
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11-06-2016, 08:57 PM
Post: #3
RE: RPi as WSPR Beacon
1. The prefix and suffix are not necessary, only the callsign. But, if you wanted the rest, it provides a provision for it.
2. The gril locator can be either 4 or 6 character, the difference is that the 6 digit will be a higher resolution and a more accurate position. Either will still get you on the WSPR map.

73, Bob, N6YPE
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