Tag Archives: Raspberry Pi

Raspberry PI WSPR – Good News…Bad News

I setup the 20m Raspberry Pi with the TAPR WSPR board and tested receive on my main rig. The good news is that it sync’d up and I could decode the signals. The bad news is that the power supply I was using was “dirty”. I switched to a USB External battery and got better results but unfortunately quickly drained the battery. The other concern was that no other stations copied the signal during the time it was operating.I will clearly need to play with this some more and try a better antenna. Here is my setup with battery and board in a food container:

On more good news, The board draws about .5A @ 5V which translates to about .19A at 12V. A 12V 7Ahr battery with a 10W solar panel should let me run this day and night. I can use a 12V USB car charger to provide the 12V to 5V conversion.

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TAPR Raspberry Pi Shield Arrives

Here is my new 20m WSPR station, minus the antenna and 5V power supply.Equipped with 16GB SD card, Wifi USB dongle and the TAPR shield containing the filters and buffer for 20m. Power output is fixed at 20dBm.

Photo Sep 03, 4 42 17 PM

Planning a 20m WSPR station Using Raspberry Pi

I have a Raspberry Pi that has been sitting around the shack for years looking for an application. I have decided to implement a 20m WSPR station with it. I have ordered a 20m WSPR shield from TAPR that has the necessary LP and BP filtering needed to make it work cleanly.Expected output will be 20dBm (100mW). I will likely be using a long wire antenna with this to get started. I have also come across a 20dB amplifier development board that may come in handy if I need to run additional power. It is made by TI for their THS3202 amplifier chip.

In preparation for the board’s arrival I have been setting up the Raspberry Pi. I loaded up the operating system onto a 16GB SD card. I am running the board “headless” i.e., without a monitor, keyboard or mouse attached. A micro USB plug provides +5V power and the connection to the outside world is via an Ethernet connection. Using the application puTTY, I can open an SSH session to the Pi and interact with it. I have since installed a USB WiFi Dongle and have now eliminated the need for the wired Ethernet connection.

I would ultimately like to run this mounted outside the shack running on solar power. With this in mind I have ordered a small USB dongle that will measure the current drawn by the Pi in this circuit so I can size the panel and battery for 24 hr operation.

RASPiTwo

UPDATE: Installed the software on the Raspberry Pi with no issues today. The software is called WsprryPi and can be downloaded at GitHub through the Pi’s headless interface. Just follow the build instructions. Inital power consumption tests are showing about 400mA @ 5V.