WSPR Without Tears
1. Open a web browser (Internet Explorer, Firefox, Chrome, …) and type in the IP address you
just recorded (192.168.0.67 for example). This will bring up the configuration screen shown in
Figure 7: WSPR Configuration Screen -
2. Enter your
callsign
and
gridsquare parameters
.
3. Enter the
SSID
and
passkey
(password) for your WiFi network. These are what you use to
enable your cell phone and things like Roku to use your home network. If you don't know what
they are you'll have to go digging through your router to figure them out (see the
Troubleshooting
section).
If you elect to not use WiFi then you don't need to enter SSID and Passkey. You will have to
keep the Pi connected to the network by Ethernet cable because the Pi uses the Internet for time
synchronization.
4. Check/uncheck the
transmit every 2 mins
checkbox. (I recommend leaving it unchecked.)
A WSPR message takes just under two minutes to send. The fastest you can send WSPR
messages is every two minutes. It's considered bad form to flood the WSPR servers with
messages. The default is to send a WSPR message every ten minutes. If you check the
transmit
every 2 mins
checkbox then messages will be sent every two minutes. This setting is useful for
testing and short term experiments.
5. Set the
Transmit Power
and
Transmit Band
to
23 dBm
and
30m for 30m and 20 dBm and 40m
for 40m.
6. When all done click on the
update
button. This will store the data on the Pi.
Restart Pi
1. Press the pushbutton on the WWoT. Hold for two seconds and release. This commands the Pi to
enter shutdown mode (you're always supposed to shutdown a computer properly or the file
system can be damaged – pulling the plug is bad).
2. Unplug the power supply, wait 10 sec, then plug the power supply back in and wait until the
LEDs on the Pi stop flashing.
Measure RF Output
The LED on the WWoT turns on when the WWoT is transmitting. Wait until the LED is on and
measure the voltage across the test points labeled
RF Level
and
Gnd
. This should be in the
range of 3-5 volts, indicating the WSPR transmitter is generating full power.
TAPR (c) 2018-2019 “WSPR Without Tears” 11 Of 20 Version 2.1
05/20/2019
