Roger G3XBM's (Mainly) Amateur Radio Blog

In all the time I have been at this QTH (now over 4 years) I have never once used 137kHz. At the old QTH I did use the band occasionally....

Some years ago I did some tests (in the car) looking to see where I could copy my low uW ERP 137kHz signal from home. Results surprised me...

Well, I optimised my 136kHz QRSS3 beacon match into my earth electrode "antenna" used on 472kHz and tested it in the house and rig...

Between tomorrow and Sunday I have 2 major aims. Firstly I need to test my 40,30,20 and 15m K1 rig as someone wants to buy it. It should b...

Well, I have found most of the bits needed for my 136kHz QRSS3 test including the E-field probe (EFP) to mount on the car roof. I need to so...

If I can manage it (health worries) I want to try a test with my 136kHz QRSS3 beacon and earth-electrode antenna from my current QTH. Last t...

Thanks to G4FEV , I've just realised that I made a fundamental mistake measuring my field strength, forgetting to turn off the AGC when ...

Using the strong German commercial station DCF39 on 138.830kHz (it is S9+ with me) as an accurate frequency reference, I have checked th...

The <20uW ERP 137.675kHz beacon was copied again by G3XIZ 48km to the west of me last night. I'm pleased with this report as the po...

This evening I restarted beaconing with my sub-20uW ERP beacon on 137.675kHz having fixed the blown FET PA. The current design is stable and...

This evening I had a good report and screenshot from Chris G3XIZ 48km away. This is my best report in terms of S/N and distance yet, with ve...

Today I converted my earth electrode antenna with elevated feed wires into a full "in the air" loop for both 500kHz and 136kHz. As...

Today I managed, I believe, for the first time to accurately measure the ERP of my QRPp system on 137kHz. This is the method used: Using ...

This is a video showing the 2W QRP beacon for QRSS3 on 136.93kHz. Using a 20m spaced earth electrode transmit "antenna" it has be...