All I have is that delivery of the first production order was to be made during FY63. Fleet installations began by end of 1963 but I have no details. 

On Mon, Sep 26, 2022 at 12:33 PM Francesco Ledda via MRCG <mrcg@mailman.qth.net> wrote:
FY doesn’t necessary means a calendar date. Does it?

Best, Francesco K5URG

Sent from my iPad

> On Sep 26, 2022, at 11:23, Nick England <navy.radio@gmail.com> wrote:
>
> This is the best I can figure out so far
>
> 4/59 SC-900E xcvr advertised. Demonstrated 5-6/59
>
> 6/59 Navy contract to SC to develop PRC-45 and URC-35 xcvrs. Amended to
> URC-35 xcvr (RT-618 plus AM-3007 amp) and WRC-1 receiver-transmitter
> (R-1051 rcvr plus T-827 xmtr plus AM-3007 amp)
>
> 6/61-10/61 SC-901X xcvr manual copyright and SC-910 xmtr-rcvr-amp manuals
> copyright
>
> 6/63 SC delivers first WRC-1 preproduction units
>
> 12/63 SC delivers 28 pilot production WRC-1
>
> FY63- SC delivers 306 WRC-1 plus 1274 R-1051
>
> 2/65 Bendix contracts for 1288 additional WRC-1 plus 3229 additional R-1051
>
> 3/67 URC-35 installations begin
>
> On Mon, Sep 26, 2022 at 10:20 AM W2HX <w2hx@w2hx.com> 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
>>
>>
>>
>> -----Original Message-----
>> From: mrcg-bounces@mailman.qth.net <mrcg-bounces@mailman.qth.net> On
>> Behalf Of Francesco Ledda
>> Sent: Monday, September 26, 2022 10:13 AM
>> To: Jim Whartenby <old_radio@aol.com>
>> Cc: mrcg@mailman.qth.net; milsurplus@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@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@gmail.com>
>>> To: Jim Whartenby <old_radio@aol.com>
>>> Cc: mrcg@mailman.qth.net <mrcg@mailman.qth.net>;
>>> milsurplus@mailman.qth.net <milsurplus@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
>>>
>>> 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
>>> 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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>
> --
> Nick England K4NYW
> www.navy-radio.com
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