WSPR - Weak Signal Propagation Reporter - From A Pi Zero ? 

That’s one of the most common mistakes people make, not having a good antenna! Someone could buy a $5000 radio, but if they use a wet bit of string for an antenna, well, it’s not gonna work very well. Thanks for watching 🙏

Using a junk citizen's band receiver that had been laying in the attic for decades, a 260 centimeter length of copper pipe, and coaxial cable leftover from the 1980s, I was able to transmit from Saskatchewan to Southern Texas. The power used was 1 watt. Every word was understood clearly, earning a 5,9 RST report. This was done on Channel 38LSB (27.385Mhz LSB) The watt meter barely moved at all, at the low power configuration I had that old CB. But it was a successful contact. I take no credit for my superior engineering, or my quality radio, for this contact. I am a pathetic engineer and my radio was equally pathetic. This was just a small gift from nature for someone operating a pile of junk. Wow! 3000 kilometers on $15 worth of junk!

For this particular test I didn’t use any filtering, but I do plan to make my own. Pre-made filter hats for the pi can be purchased online, but I’m going to try and build my own. This test was really to see which band was received better than the rest, to give me an idea of what filter I should make.

The official frequency is 432.300 MHz for 70cm WSPR, which is where receiving stations will be listening. Here in the UK the unlicensed devices such as key fobs, oil level meters, weather stations etc are all around 433-434 but I don’t think you could legally broadcast WSPR on 433 with out a license. Plus the lower part of 433 is for repeater outputs here in the UK so any WSPR would be wiped out.

@@TechMindsOfficial Where I live (France) I'm allowed 10mW from 434,04 to 434,79 without license. There isn't much traffic there, most of it (keyfobs etc...) being from 433,05 to 434,04

Integrated Electronics, you might be able to do it legally, but very few, if any, amateurs will be listening on those frequencies, and your normal range on those frequencies will not be far beyond your radio horizon. For an antenna at 2 metres above ground level, that is less than 5 kilometres on flat land. And no amateur in a CEPT country is allowed to knowingly respond to an unlicensed transmission, with very few exceptions. If you read the documentation for spectrum use within the 430/440 MHz band, you will find who is allowed to transmit there, and which types of transmission are allowed. Yes, key fobs might be allowed, but the law also states that transmission range should be restricted severely, and deliberately, as should transmitter power. Using key fob power levels for long range purposes is a contravention of that range restriction. As one source for the information, you might like to read the Band Plan on the RSGB website, here: https :// rsgb. org/main/operating/band-plans/ . France will have an equivalent organisation.

Yep sure is, although I’m waiting to change my EFHW position and then I’ll do a video on my antennas :) I don’t do ladders so waiting on my brother to come and install a bracket on my chimney 😂 Yeh I’ve been playing with DMR GPS but struggling because I don’t think my nearest DMR repeater accepts the GPS from the RT3S, but I’m still trying with it and once I’ve got it working I’ll make a video :)

Thanks! 👌

sudo wspr -r [CALLSIGN] [GRID] [10] [20m]

You need to have the briefest of looks at how command line works and also just how to read things in a logical way. “Do I enter WSPR[-h]” Do you need help? Yes, so try WSPR -h and see what it says. These things aren’t written in code, they’re incredibly logical. Replace the things in the command line with the entries you need for locator and callsign etc. Include options if required in the location specified, with spaces between.

Oh, and you don’t include the angled brackets - they’re just placeholders. Take an hour to learn how the command line works and you’ll instantly level up a bit and learn how things work under the hood a bit more. It’s so worth it for like 90% of users.