A few years ago I took a batch of 1051s to Fair Radio.  They are a royal pain to work on.  A pal was at a NAVCOMSTA in Italy some years ago, with a full brace of 1051s, of course, they were tuned to a net frequency and left alone.  Not a radio one wants to tune about with.

Happy to see the radios go away. 

R

 

From: [email protected] <[email protected]> On Behalf Of Nick England
Sent: Sunday, September 25, 2022 10:40 AM
To: Jim Whartenby <[email protected]>
Cc: [email protected]; [email protected]
Subject: Re: [Milsurplus] [MMRCG] AN/URT-23D The 10 milliwatt monster transmitter?

 

It hasn't been clear to me which came first, the R-1051 chicken or SC-901 egg,

The SC-901X and SC-910A (100w amp) manuals are copyright June 1961

 

but I just found the note below on Ed's page - It is from Fred Chapman W4CHT, original NAVELEX Project Engineer on the subject equipment.

Fred was also responsible for the first Navy SSB tests with modified 75A-4 and KWS-1, later procurement of interim RCA SSB-1 transceivers, and then procuring the standard shipboard SSB transceiver, AN/URC-32. I corresponded some with Fred back when I was first getting interested in Navy radio history, but he has since passed away. Oh, how I wish I had a time machine.....

 

Fred wrote to Ed -

---------------

The exciter was originally developed in 1961 by the U.S. Navy for the Radio
Sets AN/WRC-1, Transmitters AN/URT-23( )  and AN/URT-24 .. it is the
exciter T-827( ) /URC unit of these equipment's. USAF purchased units
and renomenclatured them and in some silos they were painted black for
some reason. Developed and originally produced by General Dynamics,
Rochester NY.
The AN/URT-23( ) is still in use today!!!!
Fred Chapman W4CHT
Original NAVELEX Project Engineer for the above equipments)

-------------------------------

 

 

Nick England K4NYW
www.navy-radio.com

 

 

On Sun, Sep 25, 2022 at 10:08 AM Jim Whartenby via Milsurplus <[email protected]> wrote:

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

Geoff Fors geoff at wb6nvh.com 
Mon Feb 1 19:51:58 EST 2010

SC-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
 

 

Not to 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 Carlson design made initially for ICBM missile silos and carried SC-900 and SC-901 designations. Later, General Dynamics took over and the R-1051's are theirs, built usually by Bendix as a contractor. There are some NATO ones built by Elmer in Italy. 

The 1051 was not made to replace the R-390A, which was still in production almost 20 years after the 1051 was introduced, although the Navy stuck them in a bunch of positions at Skaggs Island where 390A's had been. The decade frequency dial-up system sure isn't a band cruiser but 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 by module swapping on board ship, but at the depot level, repairs to modules are somewhat of a nightmare. And they weigh almost 100 pounds.

WB6NVH 

 

Jim

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

 

-----Original Message-----
From: Francesco Ledda <[email protected]>
To: [email protected]
Cc: [email protected]; [email protected]
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 <[email protected]> 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 at

 

Nick England K4NYW
www.navy-radio.com

 

 

On Sun, Sep 25, 2022 at 8:50 AM Francesco Ledda <[email protected]> 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 <[email protected]> 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 AZ

HELP....

ANY IDEAS

NICK???? ( 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

Look at the ability of the URT-23D and later models to transmit at only 0,01 watt up to 1KW.

 

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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