Discussion in 'Amplitude Modulation' started by KA4KOE, Mar 11, 2021.
Can anyone offer any more info beyond nameplate data? A friend has this particular unit.
I can't tell you anything about the particular rig it went with; I can only infer the obvious by what's there in the photos, that it isn't a broadcast transformer based on the core gap and power rating and step down. It's certainly not for any Collins ham rig on account of the power rating. Based on the frequency response and everything I've mentioned, it was probably made for a commercial short wave voice communications rig.
Not a bad turns ratio for headroom when using a common power supply; should be good enough for a little positive peak headroom. Frequency response about on par with that of a T-368 or BC-610; might actually be better than what's shown on the nameplate rating, since that may have been the bare minimum performance specified for its intended use and the manufacturer could have built it beyond that. Power rating plenty for modulating a kw DC input or more. Low frequency response could probably be improved by using it with a reactor to take DC off the secondary. There is no nameplate specification for maximum DC flow through the secondary.
Looks like typical Thordarson potted end-bell construction, so don't even think about disassembling and cross-laminating the core to get rid of the gap.
It might work well in a KW-1, but due to the lower primary and secondary impedance specifications it probably wasn't designed for that rig even though the turns ratio is about right.
What are the physical dimensions and how much does it weigh?
Good point. I didn't think about that. It looks like a pretty big transformer. I guess for 850 watts with the current through the secondary it would be pretty big for the power. It sure dwarfs the mod. transformer in the BC1G hi hi. I'm using the data plate for scale.
Hi Don, Dennis here, formerly known as Zorro WA2ZOR, now W4ZOR, when we met back with Joe, W2WAS my long departed Elmer....the transformer is mine, it's roughly 12" long, 5-6" wide and about 8" high and weighs at least 150 lbs,......
Nice transformer. Hope to soon hear it on the air.
I worked W2WAS many times, and visited him once at his QTH on L.I.
Funny how iron can hold us all together...
It's in our blood-Literally!
Someone ought to start up a ham-oriented transformer outfit called "Geritrans--for iron poor tired transmitters!"
If they just made audio driver transformers I'd be delirious. Line to grid too.