Looks like 2X 4-1000’s for RF modulated by 2X 4–1000.; could be (2 x 2) 4-400’s; hard to tell from the photo. That’s similar to what I had when in N. Hollywood (K6SVQ) where I built w/ the help my HS electric shop teacher & a HAM neighbor RF engineer from Hughes AC. Drove the RF stage w/ a Viking II and the modulator (4 810’s); yes AM days, w/ an old Hi-Fi amp, by replacing the output transformer. The HV transformer was from a pole pig supplied by a friend of my Dad's from L.A. Dept. of Water & Power & the modulation transformer was army surplus I found in an army-navy store in San Fernando. The plate transformer (w/o oil-filled case) resided in a plastic barrel outside the shack because there was no room for it inside as the shack was a 5’ x 12’ storage room off the garage w/ the big PA & PS in a rack at one end of the room, a Viking desk KW in the middle against the long wall and the other small end was the op. stn. w/ a Gonset GSB-100, Halicraft SX-101A, borrowed Collins 75S1, etc. Yes there was room only for one person inside to sit. Antennas at that time was a HB 5-el 20M yagi @ 72’ & 5-el 15M yagi 10’ above that on an old guyed Tristao crank-up. Note the rotor has a unique story of it’s own: When 15+, I was visiting an aunt & uncle in Long Beach and there was a 60’ telephone pole w/ a 3-el 20 & a 3-el 10 yagi over a “strange looking box” on top of the pole. I knocked on the door and the woman who answered said that the pole and antennas were of the previous owner and they had no means of removing it. I asked if I removed the pole and antennas could I have it. She called her husband and they both said YES as long as we did no damage to their property. I brought my Dad (general contractor) over to look and he was skeptical but said maybe. Note, at that time I had a DX35, an HQ-100 and a Gotham 3-el 15M yagi on a telescoping push-up 30’ mast that I rotated w/ a pipe wrench. Well, the next week my Dad told me he’d supply two laborers to do the work and the following Saturday, my Dad, his two guys & I went to LB, removed the two antennas, the “strange box” (an E.F. Johnson rotor) and cut down the pole in 2’ pieces w/ a chain saw. Years later I sold that rotor for $1000 to a guy in Palos Verdes. You can see the same model rotor as you drive by on the 405 S. adjacent to Olympic Blvd; what used to be Henry Radio! The 10M yagi was 6-el on another old guyed 54’ tower w/o any mfg. identified that I had bought for $40 from a junk yard. Some of the tower guy wires were tied to the bases of LA Dept, of W & P poles. (Note: I had the W & P noise guy out multiple times who arranged for spraying of HV insulators on the poles in the area and there was never a word of complaint from anybody in the crews.) For 40M, I had two phased verticals, base loaded, elevated 10’ off ground in trees w/ relays to switch orientation from broadside to end-fire. 80M had two dipoles, each fed at the top of the 72’ tower sloping to trees w/ a NE/SW or NW/SE orientation relay at the apex. After high school & the first two years of college, I was married, lived in an apt. in Van Nuys and had sold off all the antennas, towers, the big PA & radios. After completing college, had a design engineering job @ Ocean Technology & we bought a tri-level house in Northridge, got emersed in water skiing, sailing, & 2 children. When bussing of children began we moved to SB and ultimately got re-involved w/ HAM radio. No tower but the 4’ x 4’ x 10’ deep chunk on concrete still sits in our rear yard here; another story!
On Dec 22, 2022, at 4:27 AM, sbarc-list-request@lists.netlojix.com wrote:
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Today's Topics:
- FREE Collins 820D-2 1kw AM transmitter - must pick up in Wisconsin. . . (Dave Schmidt)
- Re: FREE Collins 820D-2 1kw AM transmitter - must pick up in Wisconsin. . . (Ken Alker)
- Re: FREE Collins 820D-2 1kw AM transmitter - must pick up in Wisconsin. . . (Jay Hennigan)
- Re: FREE Collins 820D-2 1kw AM transmitter - must pick up in Wisconsin. . . (Dave Schmidt)
- Re: FREE Collins 820D-2 1kw AM transmitter - must pick up in Wisconsin. . . (Jay Hennigan)
- Re: FREE Collins 820D-2 1kw AM transmitter - must pick up in Wisconsin. . . (Jordan)
- Re: FREE Collins 820D-2 1kw AM transmitter - must pick up in Wisconsin. . . (Jay Hennigan)
Message: 1 Date: Wed, 21 Dec 2022 18:04:49 -0800 From: Dave Schmidt dgschmidt@gmail.com To: "List, SBARC" sbarc-list@lists.netlojix.com Subject: [Sbarc-list] FREE Collins 820D-2 1kw AM transmitter - must pick up in Wisconsin. . . Message-ID: CAD1xK9Sqp6kduD9SdEuq_Kt_zSfxayU+DtORcPT_7F87pe_7Bw@mail.gmail.com Content-Type: text/plain; charset="utf-8"
https://antiqueradios.com/forums/viewtopic.php?f=15&t=421303&p=36015...
in Manitowoc Wisconsin. . .
Dave AI6VX