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.
[…] WsprryPi: Raspberry Pi WSPR transmitter The I/O pins provide access to a clock signal and it is possible to modulate this clock signal via software. Gerolf Ziegenhain […]
This is awesome!
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
That will kill the output, A pair for 5.1 zenners back to back would work
g7jur
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