08-12-2012, 07:00 AM
Jayce
Would you mind reposting the photos to the first post in this thread? They disappeared with the Great Phorum Crash of earlier this year. We would like to see your S-C 12A again.
Now as to your TRF alignment difficulties. Normally, a TRF set is aligned at the high end of the band, typically 1300 kc. The radio is tuned to 130 on the dial, or, the signal is tuned in on your radio first if it has one of those 0-100 dials. Using a very weak signal from your signal generator, adjust each trimmer on the tuning condenser for the highest peak at 1300, starting with the last one (closest to the detector tube on your schematic) and working your way backwards towards the first (closest to the antenna on the schematic). Keep lowering the output from your signal generator as the signal gets louder. By doing this, you are doing your best to avoid the broad tuning often encountered with misaligned TRF sets.
If the person who has been aligning your set for you is aligning at the low end of the band, he isn't performing the alignment correctly. Admittedly, most of my experience is with Philco sets, but I don't think any manufacturer recommended alignment of a TRF at the low end of the band.
Would you mind reposting the photos to the first post in this thread? They disappeared with the Great Phorum Crash of earlier this year. We would like to see your S-C 12A again.
Now as to your TRF alignment difficulties. Normally, a TRF set is aligned at the high end of the band, typically 1300 kc. The radio is tuned to 130 on the dial, or, the signal is tuned in on your radio first if it has one of those 0-100 dials. Using a very weak signal from your signal generator, adjust each trimmer on the tuning condenser for the highest peak at 1300, starting with the last one (closest to the detector tube on your schematic) and working your way backwards towards the first (closest to the antenna on the schematic). Keep lowering the output from your signal generator as the signal gets louder. By doing this, you are doing your best to avoid the broad tuning often encountered with misaligned TRF sets.
If the person who has been aligning your set for you is aligning at the low end of the band, he isn't performing the alignment correctly. Admittedly, most of my experience is with Philco sets, but I don't think any manufacturer recommended alignment of a TRF at the low end of the band.
--
Ron Ramirez
Ferdinand IN
