UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Jon_G4MDC · 7th Aug 2019, 4:47 pm

Hello Chris - thanks for additional info.
It was expected the problem would be there on all modes.

One more thing - does it really happen only when the kHz digit is showing a 5 -
meaning there is no offset for any other kHz digit 0-4 and 6-9?

I hope you find something simple to explain it. I still can't reconcile the frequencies given for Loop 2 in the PLL Block Diagram with the apparent wiring to the BCD counter Q3005. They just don't seem to agree with one another.

I wonder if you have the service manual for it? I'm working with a downloaded one and I begin to wonder if it has an error or that the frequency lineup was changed somewhere down the line. Can you see a crystal marked 63.9151 MHz maybe? That would help.

Best of luck.

7th Aug 2019, 4:47 pm	#11
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Yaesu FT480R Hello Chris - thanks for additional info. It was expected the problem would be there on all modes. One more thing - does it really happen only when the kHz digit is showing a 5 - meaning there is no offset for any other kHz digit 0-4 and 6-9? I hope you find something simple to explain it. I still can't reconcile the frequencies given for Loop 2 in the PLL Block Diagram with the apparent wiring to the BCD counter Q3005. They just don't seem to agree with one another. I wonder if you have the service manual for it? I'm working with a downloaded one and I begin to wonder if it has an error or that the frequency lineup was changed somewhere down the line. Can you see a crystal marked 63.9151 MHz maybe? That would help. Best of luck.