[Milsurplus] [MMRCG] AN/URT-23D The 10 milliwatt monster transmitter?

[Jim Whartenby]

General Dynamics bought Stromberg-Carlson in 1955 so S-C was a subsidiary of GD when the SC-900 series was developed, if I understand the history correctly.
Here is an email I saved years ago:
[R-1051]SC-901
GeoffFors geoffat wb6nvh.com 
MonFeb 1 19:51:58 EST 2010SC-901 and the 900 series as a whole were the prototypes designed around1961 by Stromberg Carlson.  They were typically installed in ICBM silos and you will see them in some of the photo collections on the web.  For example, that silo south of Tucson, Arizona, now a museum, still has them in place. Presumably SC- means Stromberg Carlson.
Geoff


Notto be a troublemaker, but going back up a ways on the previous page,Collins was not involved in the R-1051. It was a Stromberg Carlsondesign made initially for ICBM missile silos and carried SC-900 andSC-901 designations. Later, General Dynamics took over and theR-1051's are theirs, built usually by Bendix as a contractor. Thereare some NATO ones built by Elmer in Italy. 

The 1051was not made to replace the R-390A, which was still in productionalmost 20 years after the 1051 was introduced, although the Navystuck them in a bunch of positions at Skaggs Island where 390A's hadbeen. The decade frequency dial-up system sure isn't a band cruiserbut it's a great SSB receiver for fixed channel point-to-point use.Which is what the military used it for. They are fixed mainly bymodule swapping on board ship, but at the depot level, repairs tomodules are somewhat of a nightmare. And they weigh almost 100pounds.WB6NVH 
Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy

-----Original Message-----
From: Francesco Ledda <frledda at att.net>
To: MMRCG at groups.io
Cc: mrcg at mailman.qth.net; milsurplus at mailman.qth.net
Sent: Sun, Sep 25, 2022 8:44 am
Subject: Re: [Milsurplus] [MMRCG] AN/URT-23D The 10 milliwatt monster transmitter?

Fair radio does have a couple of SC-901s. The last time I was there (last may), they appeared clean, but without their 8295s.
How did the SC-501 become the R-1051?
Best, Francesco K5URG

Sent from my iPad

On Sep 25, 2022, at 08:07, Nick K4NYW <navy.radio at gmail.com> wrote:



Correct - the AN/URT-23 series was US Navy equipment.
Ed is confusing it with the USAF's General Dynamics (Stromberg-Carlson) SC-908 amp that went with his SC-901 receiver-exciter. These SC units were evidently predecessors to the R-1051, T-827, RT-618, URT-23, family
I have just begun a page on the SC-series athttps://www.navy-radio.com/xmtrs/sc-radio.htm
Nick England K4NYW
www.navy-radio.com


On Sun, Sep 25, 2022 at 8:50 AM Francesco Ledda <frledda at att.net> wrote:

The silo south of Tucson does not and did not have an URT-23. 



On Sep 24, 2022, at 21:40, ED SHARPE via Milsurplus <milsurplus at mailman.qth.net> wrote:



I think we have RX/exciter Nick.... a rig was used in Titan silos for hf.have RX/exciter would love to have rest for or display at SMECC MUSEUM PROJECT in AZ...THERE IS A WHOLE USAF USED VERSION OF THIS TYPE OF GEAR IG I AM NOT MISTAKEN IN TNE TITAN SILO SOUTH OF TUCSON AZHELP....ANY IDEASNICK???? ( and others with ideas chip in too! Please!)
Ed#           SMECC MUSEUM 
Sent from the all new AOL app for Android 
 
  On Sat, Sep 24, 2022 at 2:45 PM, Nick England<navy.radio at gmail.com> wrote:   Look at the ability of the URT-23D and later models to transmit at only 0,01 watt up to 1KW. 
https://www.navy-radio.com/xmtr-shiphtm#urt23 

I presume this is for "Limited Range Intercept (LRI)" but I don't know how this works in operation? Manually or Automagically?
===========
Link-11 - HF is used to establish a net when the range between units in the net is from 25 to 300 nm. For ranges of less than 25 nm, HF Limited Range Intercept (LRI) can be used===========
Nick England K4NYW
www.navy-radio.com




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