28:17 during your FM frequency stretch, the ELV audio started to sound like CW, I keeper waiting for ham radio call, Can't get over how great that Backward dial glass looks. I know it's sacrilege talking about modifying in the restoration community, BUT I think I would look at having a second shaft on the tuning knob for the band spread function. If possible it could be done in such a way as not spoil the appearance of the set.
A huge mechanical challenge but ferrite rotation won't affect shortwave reception so why not 3D print a support for a small value variable capacitor whose rotor is attached either directly to the ferrite rotation or maybe via a 3D printed gear attached to one of the pulleys routing the ferrite rotation dial cord? That latter option might allow the mod to be less visible (if that's a concern) but maybe there's no space? Manuel, I can hear you mutter "easier said than done". 😂😂😂 The extra variablle cap can be coupled to the SW oscillator tank circuit maybe via another capacitor in series and of small value to limit the total change in capacitance and, obviously, the SW oscillator would have to be realigned. A varactor would do the job although I believe you'd need a stable and quiet power supply for it.
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"Gleichlauf" meaning synchronisation between the oszillator and the front end over the whole band. Maybe it might help if one finds the export version of the radio. Would be interesting if they installed other coils or just different capacitors.
I would recommend using varactor diodes to fine tune the shortwave. That way all you have to do is have a variable dc voltage to adjust the tuning.
That’s the path I think I’m heading towards 😊
28:17 during your FM frequency stretch, the ELV audio started to sound like CW, I keeper waiting for ham radio call, Can't get over how great that Backward dial glass looks. I know it's sacrilege talking about modifying in the restoration community, BUT I think I would look at having a second shaft on the tuning knob for the band spread function.
If possible it could be done in such a way as not spoil the appearance of the set.
The antena rotator is another good option as it really gets no use in most cases.
Your radio your rules. You could sacrifice the ferrit rotation option and use that knob for bandspread
True. With a varicap setup.
A huge mechanical challenge but ferrite rotation won't affect shortwave reception so why not 3D print a support for a small value variable capacitor whose rotor is attached either directly to the ferrite rotation or maybe via a 3D printed gear attached to one of the pulleys routing the ferrite rotation dial cord? That latter option might allow the mod to be less visible (if that's a concern) but maybe there's no space? Manuel, I can hear you mutter "easier said than done". 😂😂😂 The extra variablle cap can be coupled to the SW oscillator tank circuit maybe via another capacitor in series and of small value to limit the total change in capacitance and, obviously, the SW oscillator would have to be realigned. A varactor would do the job although I believe you'd need a stable and quiet power supply for it.
"Gleichlauf" meaning synchronisation between the oszillator and the front end over the whole band. Maybe it might help if one finds the export version of the radio. Would be interesting if they installed other coils or just different capacitors.
Probably both. Not sure.