Side band is just not right on this radio.
I tuned the radio and rechecked everything. All settings are right on. The radio puts out full power all modes. Sounds perfect on AM and FM. All limiters in tact. Side band does not sound right. LSB has no carrier. USB is a bit strange. There is a carrier too low to see on a watt meter but it shows on a spectrum analyzer and about 11 MHz on a frequency counter. It also shows a bit on the scope.
Mode switch checks good. shows same voltages on both USB and switched to LSB.
I see no leakage in voltage from AM. or FM.
balanced modulator is good. BUT still shows a carrier in USB when the balanced modulator is removed. and microphone keyed.
IC 4 dual op amp good.
Most everything before the balanced modulator checks good. Seeing how there is a carrier with the balanced modulator removed I am thinking the problem is after the balanced modulator.
TR 30 Carrier oscillator. checks good. TR 52 SSB Audio switch good, TR 46 TX RX Amp good, TR 31 AM FM Shorting good.
Anyone have any ideas what I am missing. I think if I can get rid of the carrier in USB that will solve the problem.
Thank You
I tuned the radio and rechecked everything. All settings are right on. The radio puts out full power all modes. Sounds perfect on AM and FM. All limiters in tact. Side band does not sound right. LSB has no carrier. USB is a bit strange. There is a carrier too low to see on a watt meter but it shows on a spectrum analyzer and about 11 MHz on a frequency counter. It also shows a bit on the scope.
Mode switch checks good. shows same voltages on both USB and switched to LSB.
I see no leakage in voltage from AM. or FM.
balanced modulator is good. BUT still shows a carrier in USB when the balanced modulator is removed. and microphone keyed.
IC 4 dual op amp good.
Most everything before the balanced modulator checks good. Seeing how there is a carrier with the balanced modulator removed I am thinking the problem is after the balanced modulator.
TR 30 Carrier oscillator. checks good. TR 52 SSB Audio switch good, TR 46 TX RX Amp good, TR 31 AM FM Shorting good.
Anyone have any ideas what I am missing. I think if I can get rid of the carrier in USB that will solve the problem.
Thank You