Raspi As WSPR Transmitter
Posted: April 13, 2013 | Author: gerolfziegenhain | Filed under: Ham Radio, QRP, Raspi, WSPR |
Recently the Raspberry Pi (Raspi) has gained much interest in the Ham Radio community. One interesting things is: the I/O pins provide access to a clock signal (GPCLK0) and it is possible to modulate this clock signal via software. This has motivated Guido Ten Dolle (PE1NZZ) to implement a WSPR transmitter and to publish the sources under GPL. Within the last days I have made some minor modifications to the WsprryPi sources, built a 30m QRP filter using the ugly method and connected everything to my doublet antenna.
 |
| Raspi as WSPR Transmitter |
Immediately my 10mW have been received in 743km distance by G6HUI (WSPR Spots):
| Timestamp |
Call |
MHz |
SNR |
Drift |
Grid |
Pwr |
Reporter |
RGrid |
km |
az |
| 2013-04-13 15:30 |
DG6FL |
10.140199 |
-16 |
-1 |
JO40cb |
0.01 |
G6HUI |
IO81wl |
743 |
286 |
 |
| 7869km with 10mW |
| Timestamp |
Call |
MHz |
SNR |
Drift |
Grid |
Pwr |
Reporter |
RGrid |
km |
az |
| 2013-04-22 05:02 |
DG6FL |
10.140238 |
-21 |
1 |
JO40cb |
0.01 |
W4AC |
EL86 |
7869 |
289 |
Information on how to do this yourself can be found in the WsprryPi repository.
This is great.
BTW: Put some protection diode like BAV99! This diode will save you RPi from electrostatic discharge which can come from antenna and destroy it completely!
73 de YU3MA
That will kill the output, A pair for 5.1 zenners back to back would work
g7jur
Lovely! I’ve seen the Raspberry Pi being used as a “pirate” FM transmitter , but a rather ugly one because the frequency modulated, square wave drives the antenna without any filtering! using a (aptly named) pi filter must make it tidier. Must… try this out to evaluate my antenna performance.
73, de VE2YMV
This is awesome!