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RCA Q-103 tube ?
#12

Well You could try tuning the bcb oscillator by monitoring it's signal in a well calibrated receiver. Use C-6 to set the osc signal heard in the well calibrated receiver at 1755kc (1300+455kc) with the dial set at 1300kc on the RCA. Same thing for the low end of the band. Use L-9 to set the osc heard in the well calibrated receiver at 1055kc (600+455kc) with the RCA dial set at 600kc. It's not uncommon to have so interaction between these two adjustment so you may have to adjust these a few times to get it on the nose. If you can't get the osc to tune from 1055 to 1755kc and your bandswitch is good and clean them I'd replace C-8 and C-11.
The other thing that comes to mind is interference from other electrical devices like cell phone/lap top chargers or computers. They use switching mode power supply and generate a lot of rf noise which can be very strong.

Terry


Messages In This Thread
RCA Q-103 tube ? - by Eric - 05-06-2016, 02:00 PM
RE: RCA Q-103 tube ? - by Phlogiston - 05-06-2016, 02:35 PM
RE: RCA Q-103 tube ? - by Radioroslyn - 05-06-2016, 11:12 PM
RE: RCA Q-103 tube ? - by Eric - 05-08-2016, 08:42 AM
RE: RCA Q-103 tube ? - by Radioroslyn - 05-08-2016, 06:34 PM
RE: RCA Q-103 tube ? - by Eric - 05-11-2016, 02:35 PM
RE: RCA Q-103 tube ? - by Radioroslyn - 05-11-2016, 03:32 PM
RE: RCA Q-103 tube ? - by Eric - 05-12-2016, 02:20 PM
RE: RCA Q-103 tube ? - by Radioroslyn - 05-12-2016, 02:57 PM
RE: RCA Q-103 tube ? - by Eric - 05-13-2016, 07:58 AM
RE: RCA Q-103 tube ? - by Eric - 05-17-2016, 10:02 AM
RE: RCA Q-103 tube ? - by Radioroslyn - 05-17-2016, 03:33 PM
RE: RCA Q-103 tube ? - by Eric - 05-19-2016, 03:51 PM
RE: RCA Q-103 tube ? - by Eric - 05-18-2016, 06:19 PM
RE: RCA Q-103 tube ? - by Radioroslyn - 05-18-2016, 06:54 PM
RE: RCA Q-103 tube ? - by Eric - 05-19-2016, 09:45 AM
RE: RCA Q-103 tube ? - by Radioroslyn - 05-19-2016, 05:16 PM
RE: RCA Q-103 tube ? - by Eric - 05-20-2016, 10:55 AM
RE: RCA Q-103 tube ? - by Radioroslyn - 05-20-2016, 08:16 PM



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