кому интересно инфа с яхи.
SSB in DE1102 (maybe also in DE1121)
...has very hard tuning and stability. I seen schematics diagram
DE1103 and DE1102.
DE1103 use oscillator with ceramic resonator and two varactors, it is
better for stability and tuning too!
DE1102 use LC oscillator with one varactor and terrible idea for
tuning!
(please see schematics diagram de1102mv1.djvu in "files" at
http://groups.yahoo.com/group/KAITO-DEGEN1102/files/ )
Here is big capacitor 10nF (103) serial with varactor - it is
terrible! For "fine" tuning here is used two resistors R156, R157
serial with variable resistor for BFO control. (DE1121 has not "fine"
- but very hard tuning! And I think that DE1102 too.(?)
I have some idea for it: remove capacitor C45, and use other with
lower capacitance and use other capacitor paralell with T11 coil! I
think that tuning of BFO will be better! But here is problem: I dont
know capacitance of 1T36 varactor because I have not datasheet.
Other idea is if you use bigger resistors R156 and 157 (in DE1102!),
here is 100k and 27k, we can use for instance 220k and 47k.
It is not tested but it I think that it is good idea for experiments!
