Roger G3XBM's (Mainly) Amateur Radio Blog

G3XBM's 500kHz transverter. Ideal for 472-479kHz. OFCOM are now going to renew NoVs for the 501-504kHz band for existing permit hold...

WA0UWH's version of Chirpy Eldon WA0UWH has built an SMA version of my 10m Chirpy transceiver on a VERY tiny PCB. He is currently ...

Schematic of the G3XBM optical RX Several people have asked for the schematic of the optical receiver used in the recent "over th...

8.63km non line-of-sight reception of 481THz optical beacon Bernie G4HJW set his high power optical beacon running a 1.082kHz tone th...

Possible weak 481THz reception at 7.6km NLOS This evening I tried a 7.6km non line-of-sight (NLOS) path between Burwell and Newmarket He...

Looking around for some ideas for a local natter box, I came across these links for simple AM transmitters and receivers so far: http://ww...

Further to my post a few days ago about possible bands to use for a very local "natter link" over a 3km path between G6ALB and her...

OK1CDJ's version of my simple 40m regen receiver Ondra OK1CDJ has been in touch again recently and he mentioned that he had built a...

CQ Ham Radio Book As I've said before here,  I just can't understand why an FT817 successor has still not yet appeared. The KX3 ...

With my QRSS3 success last weekend over a 3.6km non line-of-sight path at 481THz (red light) I've been looking at other possible NLOS cl...