08-03-2017, 03:41 PM
(08-03-2017, 03:09 PM)Nowhere-Man Wrote: For example notice the IF and mixer stages in American HAM sets. As I said before cathode signal injection is often found. The HAM schematics I find easier. I will comment on the detector stages later.
Although cathode injection was used, the most popular set up across the pond was the pentagrid mixer, sometime self oscillating, sometimes fed from a separate oscillator, on this side of the pond the triode hexode and the triode heptode became the norm.
In general Ham schematics as printed were quit well laid out and easy to follow but then you get schematics like the AR88 and the BC348 which if you're not used to them can be a bit of a headache:
http://bama.edebris.com/manuals/rca/ar88/
http://bama.edebris.com/manuals/military/bc348/
Lawrence.
