Re: Telefunken SW Radio
There were several receivers around this era that attempted to give superb selectivity, freedom from drift etc.
They all took a different slant on the problems and compromises. None of them really got everything right. The telefunken sets missed out on having either mechanical or mode-specific IF filters. What they did give you were superb preselection.
The Colllins sets had good preselection (with one-knob tuning) and mode-specific filters. Their front ends and mixers weren't the best at surviving strong off-channel signals.
The RA17 family really licked the settability and drift issues. You needed accessory boxes for SSB filters. Preselection was crude and had to be driven on a separate knob. The front ends could be overloaded.
There was a continuous fight for the ultimate HF radio. The later Marconi H2900 might be one of the most over-the-top examples. It's failing was thubmwheel tuning. You couldn't search on one of these.
Well done with finding that Telefunken!
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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