Re: S-20R mixer cct.
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This might help.
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1-4-5-1, RF BLOCKING PROBE
The inexpensive DVM¡¯s and VOM¡¯s work fine unless you are trying to measure a dc voltage with RF present, like the plate, grid or cathode of an oscillator or mixer. It is simple to make an RF blocking probe for an inexpensive meter. Install a 270uh to 1mh
choke in the barrel of a dc probe. It will work with oscillators and low power mixers. Don¡¯t go messing about in the PA of a transmitter with one.
Walt Cates, WD0GOF
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waltcates