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

Sun Sep 25 10:40:09 EDT 2022

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 <
milsurplus at mailman.qth.net> 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
> <r-1051%40mailman.qth.net?Subject=Re:%20%5BR-1051%5D%20SC-901&In-Reply-To=%3C000401caa3a1%24ed665810%246901a8c0%40dell9e4qu991xu%3E>
> *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 <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 at
> https://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 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
> <https://play.google.com/store/apps/details?id=com.aol.mobile.aolapp>
>
> 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
> <https://www.navy-radio.com/xmtr-ship.htm#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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