10-28-2016, 07:18 PM
Working on my Philco Model 60 (run 7) again. After cleaning and recapping I had a motorboating issue that was solved by slightly adjusting the 2nd IF sec and 2nd IF pri trimmers. Doing so stopped the motorboating but reduced the receivers sensitivity to weak stations.
So, I decided to get setup to do a complete alignment. Bought a Heathkit Model IG-102 signal generator, went through the calibration process for it (seems good) and started through the instructions to align.
The first step, remove control grid from 6A7, set signal generator to 460kc hooked to 6A7, dial at 55kc, adjust trimmer 4 (2nd IF Sec) to max out put.
What should I hear out of the speaker? All I get is static/motorboating that I CAN adjust to max, but does not seem right.
When tuning the HF and Antenna trimmers on the tuning condenser I hear the 1400kc signal From the sig generator hooked to the ant post) and tune to that. That part seems to be working fine.
Having zero idea what to expect when setting the IF trimmers, I'm just stumbling in the dark...
Am I on the right path?
So, I decided to get setup to do a complete alignment. Bought a Heathkit Model IG-102 signal generator, went through the calibration process for it (seems good) and started through the instructions to align.
The first step, remove control grid from 6A7, set signal generator to 460kc hooked to 6A7, dial at 55kc, adjust trimmer 4 (2nd IF Sec) to max out put.
What should I hear out of the speaker? All I get is static/motorboating that I CAN adjust to max, but does not seem right.
When tuning the HF and Antenna trimmers on the tuning condenser I hear the 1400kc signal From the sig generator hooked to the ant post) and tune to that. That part seems to be working fine.
Having zero idea what to expect when setting the IF trimmers, I'm just stumbling in the dark...
Am I on the right path?
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