Roger G3XBM's (Mainly) Amateur Radio Blog

137kHz transverter with FT817 and SignaLink USB in the background Thought people might like to see the current version of the 137kHz tra...

Map showing coverage of the 471 THz optical beacon GB3CAM Guess what - I've just discovered that not only is there a decent level of...

My wife sings in a local choir called the Cambridgeshire Choral Society . They have had a website for some years but it had not been regula...

For around 6-7 years I've owned and used an IC703 10W QRP radio as part of my station. Although I have worked all over the planet with...

G0EHV's lightbeam kit (from the UKNanowaves group photos) Today I joined the UKNanowaves Group which is dedicated to optical comm...

This afternoon I fixed the problem with RX desense by adding a relay to switch the RF input and to turn off the PA supply when not on TX. It...

When testing my transverter on the bench today I noticed the receiver was being desensitised by the undriven TX strip. I don't switch th...

My tests on 137kHz WSPR are now all but completed and I do not intend to take this work any further now I've "got the measure&quo...

Last week G6ALB made a copy of my Chirpy 14 component transceiver for 28MHz CW . Andrew had access to some better calibrated test equipmen...

This evening G3WCB (101km) reported my 137.5kHz WSPR signal for the first time bringing my total number of reports on this more difficult b...