Sunday, February 7, 2016

Battleship Iowa's "Original" 1980's Transmitters Possibly ON-THE-AIR This Coming Wednesday!

WELL....it's been a long, slow, slog, but we're 90+% there.

We have two "Red Phones" mapped out through the "Coke Machine", the audio interface boxes, the transmit and receive switchboards, and the R-1051 receivers and the AN/URT-23A transmitters.

We've verified that we have correct receive audio through the receive path, and the transmit audio from the "Red Phones" also makes it down to the Transmitter Room, and drive the #3 transmitter to full (1000 Watts +) power into a dummy load.

For the receive antennas we're using the "Twin Whips" mounted up on the bridge, and for transmit, we'll be using the "Goal Post" or "Bull's Horns" antenna located just forward of the #2 stack. The "Goal Post" antenna is fed with (I think) 3-1/2" Heliax cable from the transmitter room, and some time ago I made up an adapter that connected the Andrew flange to a Type-N female so we could run coax into one of the large antenna couplers down in the transmit room.

I used my Comet CAA-500 Antenna Analyzer to verify that adjusting the controls on the coupler caused the impedance to vary, and the manner in which it varied it varied in "looked" just like we were tuning a random length antenna with a good old Johnson Matchbox.


The players are as follows:



A "Red Phone":





The Infamous "Coke Machine":






R-1051 Receiver:






Receive Antenna Couplers:






"Twin Whips" Receive Antennas:







AN/URT-23 Transmitter:






Transmit Antenna Coupler(s):






"Goal Post" Transmit Antenna:




I'm posting this early so those who are interested in trying work us will have plenty of time to get ready. We know we transmit better than we receive, even running 100 Watts from the Amateur Radio gear, so please be patient with us if we manage to make this happen.

Not all of us are "Contest Operators", so pile-ups will be dealt with "Loudest Heard First", and then we'll try to get to the weaker stations.


Look for us in the upper half of the General section of the 20 Meter phone band. *IF* we get the gear On-The-Air, it will be after 2000 UTC, and before 2359 UTC.

We'll be using an individual's callsign, not NI6BB, and we'll include "Battleship Iowa" in all our CQ's.

Hope to see you On The Air!


I'll have my tablet computer with me, so if this is a "GO!", I'll make a post here right before we go live OTA.

10 comments:

  1. May all go as planned, with very few glitches!

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  2. Good luck, hope it all comes together!

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    Replies
    1. I'm going in early to give the Grey Radio Gang some basic training on Amateur Radio operations.

      About half of them have a Technician or General class license, but none have stations at home, and they're really short on actual operating experience.

      Yours truly will the "guy on the mic" if we pull this off....

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  3. Will be listening. Put it on the calendar. Hope the propagation cooperates.
    Terry
    Fla.

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    Replies
    1. We try and operate on frequencies ending in 61 (BB-61, get it?), so look for use around 14.261, +/- any QRM.

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  4. The more I follow your blog, the more impressed I am with your technical skills. I don't understand half of what you say, but that's not important. It's the overall projects I find so interesting.

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    Replies
    1. Thanks, Harry.

      It's an honor to be allowed to work on the gear aboard the Iowa. When we're in some of the spaces where the equipment is located, I could swear we're being watched!

      Delete
  5. Going to try and tune in on a Grundig or on of the newer Tecsun shortwave radios that I have.

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Keep it civil, please....