[Milsurplus] [MRCG] Navy WRC-1 & URC-35 family history - Stromberg-Carlson SC-900A
Tom B
tbryan at nova.org
Mon Sep 26 17:42:01 EDT 2022
Hi Nick,
You mentioned that the URC-35 is called portable. This may be because it
can be operated from an internal battery. The AC supply must be
removed and replaced with a battery. I don't think it would run very
long. I can see why this was not very popular.
Tom
N3AJA
On 9/26/2022 2:14 PM, Nick England wrote:
> Those RF founders are prominent in the SC900A patent case testimony.
>
> So did anything derive from the SC-908A amp? It had a single PL-8295
> PA, 8117 driver, and ??? pusher. I’d not seen that term used before.
>
> And what was the SC-907 amp/ps?- all I know is that the manual was
> copyrighted 10/61.
>
> Cheers,
> Nick
>
> On Mon, Sep 26, 2022 at 12:10 PM John Vendely <jvendely at cfl.rr.com> wrote:
>
> ...and, of course, don't forget the redoubtable AN/GRC-106. All
> these
> historically important radios are descendants of the original SC-900
> family. The SC-900 series was indeed well ahead of its time,
> particularly its frequency synthesizer, and GDE got a lot of
> evolutionary mileage out of that baseline design. The GRC-106A was
> still being produced at Cincinnati Electronics in the early 1980s.
>
> The core group of engineers that founded RF Communications, Elmer
> Schwittek, Bill Stolze, and Roger Bettin (plus lawyer Herb
> VandenBrul)
> all worked at Stromberg-Carlson/GDE. Both companies were in
> Rochester,
> NY. In the ensuing years, a number of other engineers came over from
> GDE to RF Communications (later acquired by Harris Corp). The result
> was that some of the same people who worked on the SC designs
> worked on
> the design of RF Comm products such as the highly advanced RF-110
> power
> amp series, and the evolution is plain to see. I worked for Harris
> Corporation (in Florida) for 20 years, but worked closely with and
> knew
> many engineers at the RF Comm division in Rochester, and spent a
> lot of
> time up there. There were still a few old S-C/GDE hands there and in
> Florida at the time...
>
> 73,
>
> John K9WT
>
>
>
> On 9/26/2022 10:16 AM, W2HX wrote:
> >> It would be interesting to know how the transition from the SC
> product line to the RT-618/R-1051/URT-23 happened.
> > And don’t forget the T-827
> >
> > 73 Eugene W2HX
> > Subscribe to my Youtube Channel:
> https://www.youtube.com/c/w2hx-channel/videos
> <https://urldefense.com/v3/__https://www.youtube.com/c/w2hx-channel/videos__;!!KfGNmQmE!nUOaG__9mIIM10Kn1Lz4tXbKzdxtZEZAXkYBay-mC6ZCpJ7r2-YbD_6IsussgAafS_LJbEg02OlS5aXz$>
> >
> >
> >
> > -----Original Message-----
> > From: mrcg-bounces at mailman.qth.net
> <mrcg-bounces at mailman.qth.net> On Behalf Of Francesco Ledda
> > Sent: Monday, September 26, 2022 10:13 AM
> > To: Jim Whartenby <old_radio at aol.com>
> > Cc: mrcg at mailman.qth.net; milsurplus at mailman.qth.net
> > Subject: Re: [MRCG] [Milsurplus] Navy WRC-1 & URC-35 family
> history - Stromberg-Carlson SC-900A
> >
> > Jim,
> >
> > The SC-900 was surely ahead of its times. Potentially, it was
> vastly superior to the KWT-6. I am totally in the dark about the
> possible youth problems that the SC-900 may have suffered from.
> >
> > The SC-908 amp was not very successful, and its follow up
> (URT-23) was totally different and therefore not an evolution of
> the SC-908. It would be interesting to know how the transition
> from the SC product line to the RT-618/R-1051/URT-23 happened.
> >
> > Regarding the URC-32/KWT-6, as you well know, it is not auto
> tuned, and it is a simplified version of the ARC-58. There was
> another version of the URC-32 that kept the auto tuning
> capabilities of the ARC-58.
> >
> > Best, Francesco K5URG
> >
> > Sent from my iPad
> >
> >> On Sep 25, 2022, at 22:24, Jim Whartenby via Milsurplus
> <milsurplus at mailman.qth.net> wrote:
> >>
> >> If the SC-900 development started in the Fall of 1958, that
> answers the question of which of the three systems came first.
> >>
> >> Another thing is that the SC-900 is contemporary with the
> KWT-6. The original ground station developed during Birdcall used
> a receiver - exciter similar to the 310F-1 as shown in a photo in
> the Fall, 1958 Collins Signal, Volume 7 # 2. This is essentially
> an ARC-58 receiver - exciter, for automatic tuning, repackaged for
> rack mounting with a 60 to 400 cycle motor - generator.
> >>
> >> Not exactly sure when the KWT-6 made it's debut but it
> certainly wasn't ready for Birdcall in the mid to late 1950's.
> >> Regards,
> >> Jim
> >>
> >> Logic: Method used to arrive at the wrong conclusion, with
> confidence.
> >> Murphy
> >>
> >>
> >> -----Original Message-----
> >> From: Nick England <navy.radio at gmail.com>
> >> To: Jim Whartenby <old_radio at aol.com>
> >> Cc: mrcg at mailman.qth.net <mrcg at mailman.qth.net>;
> >> milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>
> >> Sent: Sun, Sep 25, 2022 4:48 pm
> >> Subject: Navy WRC-1 & URC-35 family history - Stromberg-Carlson
> >> SC-900A
> >>
> >> OK - The internet tar-baby got me today but I believe I now have a
> >> solid history - See
> https://www.navy-radio.com/xmtrs/sc-radio.htm
> <https://urldefense.com/v3/__https://www.navy-radio.com/xmtrs/sc-radio.htm__;!!KfGNmQmE!nUOaG__9mIIM10Kn1Lz4tXbKzdxtZEZAXkYBay-mC6ZCpJ7r2-YbD_6IsussgAafS_LJbEg02JcmSufZ$>
> >>
> >> I have added photos and references to the SC-901X transceiver, 907,
> >> 908A, and 910A amplifiers, 910R receiver, 910E exciter, and 905C
> >> antenna coupler. These were sold commercially (beginning in 1961 I
> >> believe) and to the USAF as a result of a 1959 USN R&D
> Contract. The
> >> Navy's R-1051, T-827, RT-618, URC-35, URT-24, and WRC-1
> resulted from
> >> this contract
> >>
> >> Aha! - I found a patent case showing that in June 1959 the Navy
> contracted with Stromberg-Carlson (General Dynamics) "to design
> and furnish experimental, mock-up, and developmental models of a
> single sideband radio set and a single sideband portable
> transceiver." (NObsr-77628, dated 16 June 1959 for AN/WRC-1 and
> AN/URC-35). The Navy had rights to patents developed during the
> contract, but General Dynamics claimed some of the inventions
> "were conceived and reduced to practice during plaintiff's own,
> independent project to develop a single sideband transceiver,
> called the SC900A, prior to the award of contract NObsr-77628".
> >> That led me to the SC900A development background.
> >>
> https://www.navy-radio.com/xmtrs/sc/SC900A-Board_of_Contract_Appeals_D
> <https://urldefense.com/v3/__https://www.navy-radio.com/xmtrs/sc/SC900A-Board_of_Contract_Appeals_D__;!!KfGNmQmE!nUOaG__9mIIM10Kn1Lz4tXbKzdxtZEZAXkYBay-mC6ZCpJ7r2-YbD_6IsussgAafS_LJbEg02NPQm958$>
> >> ecisions.pdf Evidently they had a working radio before the Navy
> >> contract was signed.
> >>
> >> Trivia - the original Navy contract referred to the AN/PRC-45
> portable transceiver and AN/URC-35 fixed transceiver. The names
> were later changed to AN/URC-35 portable transceiver and AN/WRC-1
> fixed transceiver.
> >> [The URC-35 was called portable - HA!]
> >>
> >> And finally I found this -
> >> April 1959 Stromberg-Carlson Advertisement -
> >> - A new approach to Single-Sideband radio by
> Stromberg-Carlson...... greater power output, less power input
> with a smaller volume.
> >> - The SC-900A digit-tuned Single-Sideband transceiver marks a
> significant advance in the state of the art.
> >> - The SC-900A is designed for both vehicular and fixed
> point-to-point communications adaptable to rack mounting and
> back-pack meets full military requirements.
> >> - Provides 28,000 stabilized channels from 2 to 30 megacycles,
> with a transmitted peak envelope power output of 100 watts.
> >> - Receive input power : 50 watts.
> >> - Average transmit input power for voice: 150 watts.
> >> - Available soon.
> >>
> >> Any additional info, photos, etc. would be greatly appreciated Nick
> >> England K4NYW www.navy-radio.com
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> >>
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> --
> Nick England K4NYW
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