WSPR Receiver
What is it?
It’s a receiver for a fixed frequency on a shortwave band (versions from 3.5MHz to 28MHz available).The fixed frequency corresponds to the receive WSPR frequency on a particular band
Why did you make it?
To be able to receive and upload WSPR spots 24 hours a day without tying up my HAM transceiver.
WSPR is a great tool to be able to check out the HF propagation at your specific location and this is a really easy and low cost way of starting to receive WSPR.
This is aimed to be a Plug-and-play product that you need to do zero work with.However, if you do want to tweak it or change the frequency for use in another application etc, the schematic and software is open source.
What makes it special?
Instead of tying up your transceiver, you will use this extremely low power device that can be powered directly from the USB port of your computer.
It is always tuned to the WSPR frequency for the given band. You plug in an antenna at one end, connect the Audio out port to your computer sound card, then power it and you are good to go.
The narrow band-pass filter at the front of the receiver gives it good rejection of strong signals. You will be able to pick up weak WSPR signals even if the band is full of strong signals for example when there is a contest going on on the band.
This can be challanging for some other receivers.
For a really low "always-on" setup you might want to use a Raspberry Pi as the computer. The receiver only consumes 0.35W!
My plan is to be able to receive all HAM bands from 2190m to 2m with this type of receiver and I will release new frequency versions from time to time. If you want a specific frequency let me know in a message. Different Bands need different band-pass filters internally.
These are the fixed WSPR Receive frequencys that are used for the different band versions:
10m 28.124,600MHz
12m 24.924,600MHz
15m 21.094,600MHz
17m 18.104,600MHz
20m 14.095,600MHz
30m 10.138,700MHz
40m 7.038,600MHz
80m 3.568,600MHz
Documentation page here.