This is an old revision of the document!
What you'll need to complete the assembly
1. Raspberry Pi 2.0 Model B or Raspberry Pi 3.0 or Raspberry Pi 4.
2. 2 amp (minimum) power supply w/micro USB connector
3. Ethernet cable.
4. WiFi USB dongle. You only need this if you're using an Pi 2.0 and you want to use WiFi.
WiFi is built into the Pi 3.0.
5. SD card (4 GB min, grade 10)
6. SD card reader (micro SD card to USB)
7. antenna mate to SMA connector
Programming an SD Card
Setup
1. You need an SD Card; at least 4GB, 8GB is better. Class 10.
2. SD Card reader/writer. We've got a Targus Micro SD/T-F. It doesn't really matter what card
reader/writer you use. It connects your SD card to a USB port.
3. Win32DiskImager – It's a freebee. Download it from:
https://sourceforge.net/projects/win32diskimager/ or
sourceforge.net/projects/win32diskimager/.
2. Install Win32DiskImager.
3. Disk Image – Download it from:
WSPR SD Card Image for Pi 2, 3 [[https://files.tapr.org/product_docs/WSPR//TAPR%20WSPR%20Image%20for%20Pi%202%20or%203%20-%2011Feb2019.img.zip]]\\ WSPR SD Card Image for Pi 4. [[https://files.tapr.org/product_docs/WSPR/TAPR%20WSPR%20Image%20for%20Pi%204%20-%2001Apr2021.img.zip]]\\
4. Unzip the file after it's finished downloading (it will take a while).
Program SD Card
1. Plug the SD Card reader/writer into a USB port.
2. Plug the SD Card into the reader/writer.
3. Start Win32DiskImager.
4. Click on the folder icon in the upper right and find the disk image you downloaded and
unzipped.
5. Click Write and go get a cup of coffee. Note: Win32DiskImager shows a small message box
when it's done writing the SD card. Unfortunately, the message box likes to hide behind
anything else you have up on the screen so you can't see it. Be forewarned that you might have
to go looking for it.
6. Click Exit.
7. Remove the SD card and install it into the Pi. Make sure that power is disconnected from the Pi
before doing this
If you haven't annoyed the gods of the Internet too much today you should be in luck and everything
will work!
Install SD Card into Pi
First, insert the SD card into the Pi
The SD card sorta slides in up side down.
On Pi 2.0 it ratchets in (pops in then out a little and sorta locks in place).
On Pi 3.0 there's a friction fit, so there's no locking.
Setting WSPR Configuration
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 Kit board. 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.
Credit - https://tapr.org/product/wspr/