Thread: Yaesu FT480R
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Old 11th Aug 2019, 8:54 pm   #14
Jon_G4MDC
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Default Re: Yaesu FT480R

That is all very useful info Chris 1155. Will be thinking on it in due course.
It is most strange that the manual appears to disagree with itself - but that is how it is.

Julesomega you are not far wrong. The finest steps (of 10Hz) are indeed by VXO.

The 100Hz steps are actually done at 5kHz but then divided by 100 to 50Hz before being multiplied by 2 for eventual use.

Chris - can you identify Q3005?

Do you think you could measure the Voltages on the pins that correspond with your table? It would need a multimeter or oscilloscope of some sort. I think (offhand) there are about 8 pins to be measured.

If the binary going in is correct then it must be a divider chip fault.

Otherwise, if the binary input does not follow the right pattern, then it must be the shift registers (4094) or else the microprocessor which generated the serial data stream. (That one is highly unlikely I think since the display is correct).
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