Roger G3XBM's (Mainly) Amateur Radio Blog

This afternoon I did a bit more on the optical front. I repeated my outdoor range tests using a low-cost high brightness LED as both a baseb...

In my professional life I interviewed many graduates aspiring to become RF engineers. Very few, in recent years, had what I would call ...

The latest NOAA sunspot predictions show cycle 24 now peaking in May 2013 at a smoothed sunspot high of exactly 100. This is UP on earlier ...

G3ZJO's reception of DK7FC on 8.97kHz Yesterday's test by DK7FC from his fixed location was a resounding success with receptio...

Today I see that amateurs in New Zealand are to be allowed 1kW power in future; their limit was 500W earlier I believe. I've read somet...

50mW WSPR Reports 28MHz It really is too easy now on 28MHz! In just a few minutes, these were the reports when using just 50mW to my sma...

Interference from CBers on the 28-29.7MHz band is getting worse. I guess they've been there a long time now but with good conditions the...

670nm receive head and converter to 80m Today I did some further light beam experiments, this time using a 25kHz modulation signal on th...

This evening I came on 80m to listen for G6ALB who was taking part in the valve QRP day. Using my  18mW output FETer transceiver (18 par...

Today I carried out my first optical communications tests since 1966. I built a small "baseband" (i.e. not on a sub-carrier based)...