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Bio

My Ham Radio callsign is G1OJS and my name is Alan Robinson.

I’m now retired from 30 years working in the Space Industry after completing a PhD in Electromagnetics in 1992. I’ve been interested in electronics since I was about 8 or 9 years old (1975?) and had my ham radio license since 1985. I’ve always been interested in antennas and a lot of what I do now is about making them and testing them.

You can find quite a lot of ham radio content from me on my G1OJS pages at Instagram, and more about me on my G1OJS page at QRZ.com.

On this site:

Airband Radio Receivers

G1OJS VHF Airband Superhet Receiver

G1OJS VHF Airband Superregen Receiver Altoids Tin

G1OJS VHF Airband Superregen Receiver with Speaker and Squelch

“Magnetic” loops and capacitors

A High Performance QRO Magloop without a Vacuum Capacitor?

Calculating padding capacitors

Dedicated Sites

BandOpticon: see who’s active in your country and who’s receiving who

SARK100 Firmware and all about RF Bridges