[Mike Stamper]

I finished repairing my S-108. It was the second IF transformer. I secured a good used replacement, repaired the burned-out resistors (from the high voltage short of the previous transformer), and once again my Hallicrafters worked.

I went through the alignment process per the instructions in the manual. Instead of listening for changes in volume, I hooked my scope to pin 5 of the 6H6 detector, and viewed the amplitude of the 455kc carrier wave. I peaked the IF transformers, and adjusted the RF on each band. I used a brand new frequency counter to calibrate the RF generator for each step.

Regarding the RF alignment, I have a question. I assumed that I should have adjusted the RF trimmers/coils so that that calibration of the bandwidth frequency corresponded to the frequency on my RF generator. For example, I would set the generator to 28mc, set the tuning control all the way to the right (out of the circuit), and adjust the bandsweep to 28 mc. I would then adjust the trimmer so that the carrier wave would appear at the 28mc mark. Once the oscillator frequency was set (and accurate), I would peak the waveform using the mixer and antenna trimmers. Did I get this right? This seemed to work; however, I wasn't sure.

Another question: I don't have a 20uh inductor required to make the recommended dummy antenna, so I simply attached the RF generator leads to the antenna terminals. When everything was done, I attached a long-wire antenna (and ground) and re-tweaked the antenna trim using actual station signals. Is the dummy antenna necessary?

Have I missed anything? The radio works pretty well, except on the AM broadcast band, which is a little weak but may lack an adequately long test antenna. Thanks to all for responding.