This site posted the 2020 cross for DL in zip, there maybe was a 2022 version but not sure. https://www.electronicoscaldas.com/datasheet/NTE/qc2020v1.zip ..read more

I’ve converted several of them also. They get the job done ..read more

I am restoring a Collins 75A2 RX and the 160M T1 coil slug is missing. This is the slug furthest toward the rear of the chassis on the movable slug rack labeled 160. The 75A3 RX uses the same slug in the same position. If you have a junker 75A2 or 75A3 and could spare this part I would be willing to pay a reasonable price plus shipping. Thanks, Mark WA1QHQ ..read more

Yep, 3ph 'smaller' iron, since our service is 200A 277/480 (on a residential rate meter)with a 45kVA dry step-down to 120/208. 3ph supplies are so easy to filter, FW gives you a little 360Hz ripple. 2Hy & 2uF works pretty well, 4 & 4 is almost pure DC, and the source impedance is down in single digits. And they take up a lot less room than 1ph supplies.  Lighter, too...less iron. D ..read more

Quote from: Detroit47 on Yesterday at 10:21:42 AM It is single phase. The RF deck was designed by Rube Goldberg. I guess it was made to accommodate a changing load. Johnathan N8QPC They where almost always designed by Charlie Asimoto who later went on to found ASI (Amp Systems Incorporated).   Charlie designed most of the high power Henry stuff since the mid 70s.  Smart guy. I've worked on plenty of his stuff to realize smart didn't always translate to working.  He built a bunch of 10ks amps for uncle Sam back in Desert storm days. None worked upon delivery. And yes on ..read more

Sharlene Katz WB6FFE went on to earn a PhD in Electrical Engineering.  SK a few years ago ..read more

I wish I.had known that I had a  Collins am0lifer / tra smitter si gle 4cx5000.. 3phasee 220. I traded it 9ff I couldn't use it. Johnathan N8QPC ..read more

Ah, that is prolly good in your case. I'm always looking for 3ph iron in that power range. 73DG ..read more

Hello AM Lovers, This afternoon I heard some stations on Ten Meter in AM. First I listen in our livingroom, later in my studio. All were around 16.00 hour GMT time! Thats by us 18.00 hour Summertime in the late afternoon. 1. I heard 2 stations on 28.990 in AM, one has a good signal and some fading 2. In my studio I heard GW6??? from the Uk, weak signal and I heard WA9??? both on 29007 3. My friend PA3HDM and I heard an USA station on 29.030 with fair to good signal A pity, the signals were not constantly good. Many fading, only a little time good to understand. Some AM lovers in The Nether ..read more

It is single phase. The RF deck was designed by Rube Goldberg. I guess it was made to accommodate a changing load. Johnathan N8QPC ..read more