I see Fred H is a ham SM6JNA (ex. YO2ARU)
I used to be, many former lives ago, GM3GUC and ZC4BN. My Tx was a low-powered 807 o/p (10 W) with clamp modulation, driven by a two-stage 12AX7 Colpitts VFO/buffer into a 6V6 driver on the 160 and 80 m bands and my Rx was an ex-army R107 (fantastic in its day). I also played around with the 450 MHz band with a two-valve (acorn valves) transceiver using a fairly unstable transmission line tuning circuit. The same circuit acted as a receiver in a superregenerative mode. I made two of them and used to get quite good line-of-sight results. My brother took one to the top of Ben Lomond, while I stayed at home and we managed a brief 2 way contact over a line of sight distance of ~100 km, pretty well a Dx record for those days (~1949).
Any others?
I used to be, many former lives ago, GM3GUC and ZC4BN. My Tx was a low-powered 807 o/p (10 W) with clamp modulation, driven by a two-stage 12AX7 Colpitts VFO/buffer into a 6V6 driver on the 160 and 80 m bands and my Rx was an ex-army R107 (fantastic in its day). I also played around with the 450 MHz band with a two-valve (acorn valves) transceiver using a fairly unstable transmission line tuning circuit. The same circuit acted as a receiver in a superregenerative mode. I made two of them and used to get quite good line-of-sight results. My brother took one to the top of Ben Lomond, while I stayed at home and we managed a brief 2 way contact over a line of sight distance of ~100 km, pretty well a Dx record for those days (~1949).
Any others?
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