[Milsurplus] TRC-75 or ARC-58 manual wanted

Fri Jul 25 03:14:33 EDT 2025

Hi Francesco

Yes
I need a copy please,
what are your costs?

regards
ray

On 2025-07-24 02:00, milsurplus-request at mailman.qth.net wrote:
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> Today's Topics:
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>    1. Re: TRC-75 or ARC-58 manual wanted (Francesco Ledda)
>    2. Re: Mystery Raytheon AN/PRC-xxx (John Vendely)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 22 Jul 2025 20:18:53 -0500
> From: Francesco Ledda <frledda at att.net>
> To: robinson at tuberadio.com
> Cc: milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] TRC-75 or ARC-58 manual wanted
> Message-ID: <3D6E3CCA-C11D-4576-90B9-0B6FB8DC721E at att.net>
> Content-Type: text/plain; charset=utf-8
> 
> I have the manual in PDF.
> Please, contact me.
> 
> Best, Francesco k5urg
> Sent from my iPad
> 
>> On Jul 16, 2025, at 06:18, robinson at tuberadio.com wrote:
>> 
>> ?Hi all,
>> 
>> I am looking for a manual for the TRC-75 or ARC-58
>> it is thick I know.
>> Also looking for a pp-2352 inverter
>> 
>> regards
>> ray
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> 
> 
> ------------------------------
> 
> Message: 2
> Date: Wed, 23 Jul 2025 10:42:04 -0400
> From: John Vendely <jvendely at cfl.rr.com>
> To: milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] Mystery Raytheon AN/PRC-xxx
> Message-ID: <5c92aa5c-ffb1-468f-8c8e-eb993dd6c7ab at cfl.rr.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
> 
> Yes, this is clearly a mid-1960s design, and undoubtedly was Raytheon's
> offering for an SSB manpack set during the early Vietnam war period.? 
> It
> was an interesting period from the tactical radio viewpoint, with new,
> advanced SSB, synthesized solid-state designs appearing, and this was
> one of them.
> 
> When Kennedy involved the U.S. in Vietnam, the Army's HF manpack set 
> was
> the obsolete AN/GRC-9, which was 1940s technology.? The Army's SSB
> manpack development program was the AN/PRC-62, begun at RCA in 1962.?
> The PRC-62 was highly advanced; 20W USB or CW, 2-30 MHz in 1 kHz steps,
> operating from 10-30V DC, and useable in either manpack or vehicular
> configuration.? By 1964, LBJ was escalating the war, the complex PRC-62
> wasn't ready, and the Army started looking at alternatives.? DARPA
> conducted a southeast asia field trial of the available HF manpack
> radios including the prototype AN/TRC-88 (SSB version of the
> crystal-controlled TRC-77), the Hughes HC-162 prototype, and probably
> this Raytheon prototype.? They even tested a commercial Japanese SSB 
> set
> marketed to the maritime industry, which gives an idea of how desperate
> they were.
> 
> After various modifications, the Hughes HC-162 was designated 
> AN/PRC-74,
> but was referred to as "the interim HF manpack", as it was intended 
> only
> to fill the gap until the more advanced PRC-62 entered service.? The
> PRC-62 was field tested at Ft. Huachuca in 1966, and some sets were 
> sent
> to Vietnam, but ultimately, the radio never entered service--exactly 
> why
> is lost to history.? As late as 1968 the PRC-74B was still called "the
> interim HF manpack" and, although it wasn't what the Army really 
> wanted,
> it did provide satisfactory service, so around that time PRC-62
> development was quietly terminated.
> 
> Some important technology came out of these prototype radios,
> particularly in the area of frequency synthesis.? The magnesium battery
> technology developed for the PRC-62 ended up in the PRC-77, and the
> PRC-62 battery box was later used on the PRC-70. I restored a prototype
> PRC-62 and found it to be quite a good radio.? This Raytheon set, like
> the RCA PRC-62, is a forgotten piece of tactical radio development
> history.? Probably only a handful were made, and it may be the only one
> of its type left. Hopefully someone will analyze and test it, and let 
> us
> know how good a radio it actually is.
> 
> 73,
> 
> John K9WT
> 
> On 7/22/2025 4:16 PM, Brenda Gentry via Milsurplus wrote:
>> 
>> Could it have been a competitor to the PRC-74?
>> 
>> ?? B. Gentry, KA2IVY
>> 
>> On 7/22/25 4:09 PM, Nick England wrote:
>>> Whazzit?
>>> 2-11 mc AM/SSB/CW transceiver, 1965 vintage?, 12v battery
>>> Transistor, Synthesized, 1 kc increments (1 mc master oscillator)
>>> 455kc Collins filters. Lots of double-balanced mixers.
>>> Raytheon logo on one circuit board but not elsewhere.
>>> https://photos.app.goo.gl/6GmGTnuy9mByHDBi7
>>> 
>>> Some of the photos are just from trying to use the camera as a
>>> magnifying glass.
>>> It looks like the front panel ought to fold down, but connections to
>>> the LOAD control prevent that - I'm still trying to figure out how to
>>> get deeper and trace some connections.
>>> 
>>> I couldn't remove the cover atop the slug-tuned coils - I lifted and
>>> peeked and it looks like the 1mc bandswitch. I can't figure out that
>>> nearby module coupled to it by the chain and with leads from the LOAD
>>> switch.
>>> Handset connector is MC10-14-6PN - a second connector was pulled and
>>> extender wires added.
>>> A cable/BNC connector has been added which runs back to the 455kc IF
>>> module.
>>> The antenna connection has been bodged up a bit. The battery
>>> connector was replaced by a 3-wire terminal strip.
>>> 
>>> The 2N1899 output transistor is rated 125w dissipation.
>>> 
>>> It looks like there may be an internal switching p/s module (left
>>> rear of chassis)?
>>> 
>>> Please email info or leads
>>> Thanks
>>> Nick England K4NYW
>>> www.navy-radio.com <http://www.navy-radio.com>
>>> 
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