Roger G3XBM's (Mainly) Amateur Radio Blog

Jim M0BMU was firing up his transmitter on 137kHz today using WSPR. Managed very good reception of his 200mW ERP here at 69kms range. See s...

This is the schematic of my 500kHz QRP TX transverter (from 28MHz). The next steps are (a) to add a couple of relays and RF sensing so that ...

Just got this letter from M0BMU who has estimated my ERP on 500kHz currently . Dear Roger, LF Group, It is interesting to make an estimate ...

Chris, G3XVL, in Ipswich has just sent me a screenshot of my 500kHz WSPR signal this morning when I transmitted at 100% for about 30 minutes...

500kHz is proving quite a challenge at the moment: before I modify my set-up in a few weeks' time to increase my ERP ( less than 1mW cur...

A few months ago I was asked by Junichi Nakajima-san, JL1KRA , if he could translate an entry on my blog about the Sixbox 6m AM transceiver ...

Hamilton, PU2XLB, has built a Fredbox 2m AM transceiver using the G4BYE adaptation of my original schematic. The G4BYE version has an LM38...

This morning I was received on 500kHz WSPR by G7NKS near Biggleswade. This is his screen shot showing my signals. Notice my drift upwards w...

This evening I am trying a different approach to the 500kHz antenna . My 15m longwire is strapped to my ground wire and now is acting as a ...

G6ALB sent me a screenshot tonight of my 500kHz WSPR beacon as it was warming up. For the first 30 minutes it moved some 59Hz, not a lot rea...