05-20-2017, 07:48 AM
on mine, i found all my IF transformer ceramic caps were bottomed out.
this was not right. I did a quick read in the service document i got and it says to start adjusting each IF to max auidibility starting with the IF closest the the power supply and move your way out to the one closest to the antenna.
what i did was tune to am 960 which gave me at 70% volume gave me some degree of listening abiity and adjusted the first one closest to the power supply, i could hear an improvement once i went back and forth centering the cap upon the highest audibility. I did the same to the next and centered the cap to the hightest audibility ,, more volume started happening. the last IF transformer brought in more volume.
i concluded someone at some time in the past was preparing the radio for an alignment , i speculate that step one is to bottom out all the IF transformers then start injecting antenna signal.
doing what i did cured my humm noise and brought in more volume and more channels.
hope this helps
this was not right. I did a quick read in the service document i got and it says to start adjusting each IF to max auidibility starting with the IF closest the the power supply and move your way out to the one closest to the antenna.
what i did was tune to am 960 which gave me at 70% volume gave me some degree of listening abiity and adjusted the first one closest to the power supply, i could hear an improvement once i went back and forth centering the cap upon the highest audibility. I did the same to the next and centered the cap to the hightest audibility ,, more volume started happening. the last IF transformer brought in more volume.
i concluded someone at some time in the past was preparing the radio for an alignment , i speculate that step one is to bottom out all the IF transformers then start injecting antenna signal.
doing what i did cured my humm noise and brought in more volume and more channels.
hope this helps
