[ARC5] AN/ARC-7 ... Plus AN/ARC-6

[Geoff]

From: "Mike Morrow" <kk5f at earthlink.net>
To: <arc5 at mailman.qth.net>
Sent: Saturday, April 20, 2013 3:03 PM
Subject: [ARC5] AN/ARC-7 ... Plus AN/ARC-6


<AN/ARC-6   UHF (actually VHF) Command (Special)>


It was still referred to as UHF in those years just as 30mc was at one time.

Carl


----- Original Message ----- 

>> As a possibility exists that the receiver portion of the set, if
>> it is proved satisfactory, may be used separately as a ground receiver
>> with Radio Set SCR-522, the receiver is built as a separate unit,
>> containing its own power supply.
>
> Jack wrote:
>
>> I'm curious about this paragraph.  I wonder what is
>> meant by "ground receiver with Radio Set SCR-522".
>>
>> Could this paragraph have really meant to say
>> "guard receiver" instead?
>
> I believe that's *exactly* what was meant...but it's hard to know for 
> sure.
>
> BTW, the cited section of the "Graphic Survey..." has brief details of the
> AN/ARC-6 on pages marked SECRET.  It was to be a 33-frequency, 8-channel
> "UHF" set operating voice only between 225 to 285 MHz, about 5 watts 
> output.
> The description contains:
>
> "Radio Set AN/ARC-6 (PREP) is an Ultra High Frequency Command Set now 
> under
> development, providing line-of-sight communication of voice only, by means
> of pulse-modulated waves between aircraft and between aircraft and ground
> stations.  The set consists of a combined U.H.F. Transmitter-Receiver with
> dynamotor mounted in a single standard shock absorbing ANB mounting, and a
> control box which enables push button selection of eight preset channels
> which may be any of 33 channels within its frequency range of 225-285
> megacycles. Switches for manual control of the set are located on the
> control box, which is mounted on Mounting FT-240-A. The equipment operates
> on an input voltage of 28 volt D.C. and has an average power output of 4 
> to
> 6 watts into a 50 ohm resistance load. Side-tone feature is available.
>
> "Anti-jamming feature of the set is highly developed. The equipment is a
> narrow band systems [sic] necessitating the use of relatively slow speeds
> of transmission. It utilizes a printer mechanism in conjunction with other
> apparatus. This equipment was designed, not to replace existing
> communication equipment in the aircraft, but merely to supplement the
> present equipment.
>
> "There were no Army Supply Program requirements as of 30 November 1944."
>
> That states some rather interesting characteristics:
>   "pulse-modulated waves",
>   "a narrow band systems necessitating the use of relatively slow speeds
>    of transmission",
>   "utilizes a printer mechanism in conjunction with other apparatus",
>   "not to replace existing  communication equipment".
>
> I wonder just what all that meant, back in 1944.
>
> Anyway, it's clear what the first ten AN/ARC- systems were:
>
> AN/ARC-1   VHF Command
> AN/ARC-2   MF/HF Command
> AN/ARC-3   VHF Command
> AN/ARC-4   VHF Command
> AN/ARC-5   MF/HF Command, VHF Command
> AN/ARC-6   UHF (actually VHF) Command (Special)
> AN/ARC-7   VHF Command (glider et al)
> AN/ARC-8   MF/HF Liaison (AN/ART-13A, AN/ARR-11)
> AN/ARC-9   MF/HF Command (Bendix RTA-1B)
> AN/ARC-10  VHF Relay (modified SCR-522-A)
>
> Mike / KK5F
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