12,000 miles on 0.2 watt!! Yet another WSPR beacon

Yet another homebrew WSPR beacon. This one is for one band, anywhere from 137kHz to 144MHz. It is fully self-contained and automatic, as it gets time synchronisation from a Ublox GPS. It can be built in a few hours on a breadboard, it's so simple!

[johnwest]

Thank you.
I learned on the LowFER band in the USA just what low power, (7 mW EIRP, ) low frequency, (1750 meters, ) and low data rates, (1 bit per second, ) can do for long range communications. I was blanketing about 1/3 of the USA with my signal, essentially in groundwave. Putting the attributes of low data rates and low power together with skip conditions on HF is every bit (bad pun) as impressive. Your simple, low power transmitter shows what can easily be done with little expense. I hope this video convinces others to get into building their own rigs for such tasks, because ham radio is all about learning. Well done.

[SeAfasia]

Hi Paul,
excellent constraction, demands many tests and patience...thanks for share again..Dinos..73

[MirlitronOne]

Fascinating though it is, this is not an unusual result for WSPR.

[DanMinciu]

...Watching your videos and reading posts on wordpress make me think to become radio amateur(of coarse, here in Romania)...but this project is outstanding. The distance and the power on Tx make me thrill... Gorgeous. Time sincro could be done also via NTP servers, from time to time and after, internal clock could be maintained by Ardu. I've done that on my NixieClock, with ESP8266(actually NodeMCU).

[johnmacey]

Hi Paul,
A fine effort (12, 000mls on 800mW)
Congratulations!
I'm in MEL too, a retired Comms Engineer ( a long-lapsed Ham (VK7ZOO) from 50 years ago).

I have long thought about using a different technique for ultra=low transmissin on the 20m band.
I calculate that it could outperform Whisper by a big margin

The 1mW transmitter is trivially simple.
The receiver is not!
I've got a most of the components to build the receiver, but never got around to doing it !

You have sparked my enthusiasm to give it a try.

I will eventually need the cooperation of licenced Hams to trial it.

Are you interested?

[rstnn]

Very appearing box!
How you cut this square hole for LCD display!

[GNMY]

You make it all look so easy Paul.
Does the GPS lock the frequency or is it just used for clock timing accuracy?
Again an excellent presentation, thanks for sharing.
72 Mark G0NMY

[Steven_Bennett_YT]

Hi Paul, just read your article in SPRAT and watched this video. I'm inspired to have a go at building it, just one question is there a schematic for connecting the LCD, I'm not sure if you used I2C or a parallel connection method? Many thanks for sharing this project.