linrad support: DC power for 70 to 10.7 MHz converter.
(Nov 2 2002)
The MOS-FET amplifiers which run at about 0.12A for each transistor are fed directly from the input voltage through RC filters to avoid heating the regulators too much in case the unit is powered by a bit more than 15V.

Good decoupling of plus and minus 5 volt supplies is essential for low sideband noise in the local oscillator.

Fig.1. Details of the DC power stabilisation.

Fig.2. Decoupling capacitors.