12-10-2021, 05:42 PM
Are all frequencies up and down the dial off by 40 kc? If so it could be your IF is off by 40 kc. This would make the dial calibration low or high by that amount.
I had a similar problem with an RME-69 communications receiver. Every dial freq was off by 35 kc, but at first did not realize what was the problem. Thought it was just the osc alignment. Turns out a previous owner aligned the IF at 500 kc instead of the correct 465. I finally found the problem when the crystal IF filter did not work since it is fixed at 465 and did not line up with the IF transformers tuned to the incorrect 500 kc.
Aligning the IF to the correct 465 kc cured the dial freq error and allowed the crystal filter to operate properly.
I don't know if you may have the same problem, but it would be worth checking the IF alignment and confirm it is peaked at the correct frequency.
I had a similar problem with an RME-69 communications receiver. Every dial freq was off by 35 kc, but at first did not realize what was the problem. Thought it was just the osc alignment. Turns out a previous owner aligned the IF at 500 kc instead of the correct 465. I finally found the problem when the crystal IF filter did not work since it is fixed at 465 and did not line up with the IF transformers tuned to the incorrect 500 kc.
Aligning the IF to the correct 465 kc cured the dial freq error and allowed the crystal filter to operate properly.
I don't know if you may have the same problem, but it would be worth checking the IF alignment and confirm it is peaked at the correct frequency.
