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Title: Thordarson T-20A24 Post by: KG6UTS on August 15, 2011, 07:10:19 PM Found a pair of these interstage xfmrs. Bunker of Doom catalog # 630 says 1:3 @20K pri/180K sec both ct. Anyone have paperwork or color code on these?
Thanks! EdZ KG6UTS Title: Re: Thordarson T-20A24 Post by: KE6DF on August 15, 2011, 11:43:08 PM It shouldn't be too hard to figure out.
The manual says it has a center tapped primary and a split secondary. So, using an Ohm meter you can find three wires making up the primary. The resistance between either end and the CT should add up to the resistance from end to end. That should leave you four wires for the two halves of the secondary and you can find out which wires make up each 1/2 of the secondary with the Ohm meter. Then put a small AC voltage from a filament transformer into the primary and see which way you need to connect the two secondaries so the output voltages add. Title: Re: Thordarson T-20A24 Post by: W7TFO on August 16, 2011, 12:00:56 AM Primary usually: Brown-Red-Blue AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Split secondary usually: Green/Black twice 73DG |