russian ssb - diagram
HI DEVUCOOL!
1. "Donald-duck voice" is how SSB sounds at the AM receiver, with out BFO injection.
It is a fovourite term used by HAM radio homebrewers ( atleast used to be).
2. The AM receiver and a loose coupled outboard BFO is sufficient for carrier Nulling and other modulator alignment. I have never used an oscilloscope to align the modulator till now!
3. vfone, You are right : DSB is not a 'distorted' signal per se. The description is just symbolical as calling any SSB signal as "distorted with respect to an AM signal":!:
4. Your suggestion of 50k pot is perfect. A multi=turn preset will provide better control. But there is a serious shielding problem.
5. devucool: PTH boards are not leak proof. I have seen your lay-out. You need to attach a ground plane below the modulator area ( solder side) and connect it to ground, like a lid. Build a box around the filter, abt 2mm more than the xtls of the filter. A single side PCB is ideal. These techniques will help to keep the carrier out of the modulator other than the signal input point.
:arrow: Difficult to understand, but it is easy to "see" this: A radio receiver kept at a distance ( say 1 feet away) and with no electrical connections will receive the oscillator signals. This is proof that the signal is :arrow:radiating, too much, not shielded sufficiently. If it is picked up from 1feet away, how about some centimeters??
6. You say 4Mhz + $mhz= 8MHZ o/p....
This is not favourable:!::!: Change the output to 9Mhz or somethging that is not a multiple of 4Mhz ( XTL or Car. Freq). This will avoid superfluous signal injections.
:arrow: Just remember: every oscillator is a transmitter and will radiate, no matter what the power level:!::!::!:: This is the biggest problem of RF signals cry: