[GreenKeys] Comparing td/LXD coils

[Jeffrey Golas]

At the ship Im still working on a 28ASR dome top that I call "#2" (as theres another one next to it known as #1). I havent posted here about it in some time but over the last year I pieced it back together and in December I got it running for the first time in 20+ years. Nearly every single wire/harness in it was cut. We have a former TTY tech who went through the printer as well. I had to swap the keyboard base with another as its gearset and plug were both smashed. We put in a 45.5 baud gearset and Ive had a few QSOs with Nick from the ship!

Anywhoo...as this is really a Navy UGC-48A, it used low-level signalling (which I also fixed), but skipped the clutch ESA as thats only really used with encryption.

The downside is the coils in the tape reader seem to be different from a stock 28, in that they run about 75 ohms each instead of the 210ohms Ive seen in other manuals. In this unit it would have been powered by the clutch esa, but it would take a lot of effort to fix. I think it would have been 50-90v ish and likely pulsed.

Does anyone know if I can just hook 120vac up to them...maybe with a resistor? Another 28 manual said to switch the 210ohm coils to parallel if running non-pulsed 120vac which would be 105 ohm and prob pull an amp. These Id have to leave in series to get 140ohms or so. Would that work?

I confirmed the tape reader works otherwise, I just dont want to burn these up. Maybe its easier to just find a pair of stock coils?

Jeff