10 W/70 cm amplifier - for long-distance transmission

2-16 — elektor february 1982 10W/70cm amplifier 10W70 cm amplifier for long-distance transmission This particular circuit is an extension to the 70 cm transverter described in last year"s June and October issues and boosts its power output up to 10 W. Under favourable conditions, the amplifier enables distances of thousands of miles to be bridged on the 70 cm band. The set provides enough power to carry out intercontinental communications using amateur satellites such as OSCAR 8, for instance. Since the amplifier is linear (it is set for class AB operation, so it draws some quiescent current) it will boost both SSB and FM signals. The circuit is temperature-stabilised and is free from oscillation problems. This means it is straightforward to construct; an ideal supplement for the transverter. J. Oudelaar, PAOJOU Although the circuit was originally intended for 28V operation, only a few component values need to be changed for a 12 V version. Both sets of values are shown in figur...