[Milsurplus] AN/TRC-1

[C.Whitaker]

de WB2CPN  -  A Short Tutorial - Can't Resist.
The Bell Telephone system, and others throughout the world,
originally used dual sideband AM on their wire carrier systems.
The "N" series are examples.  The "C" and N-3 were SSB
systems.  All these systems survived until the "T" digital system
became widespread.
For longer systems, transcontinental, the "K" carrier led to
the "L" systems which were all single sideband, frequency
division.   The "L-3", 1860 telephone channels per coax, was
common for years, but was upgraded by the "L-4", and later
the "L-5" during the 1970 area.  The "T-3" was the last of the
copper wire digital systems until the Light Guide Fiber Optics
systems suddenly spread all over.
AN/TRC-1 could be used as a single-channel telephone link,
say between a Control Tower and Remote Site, or they could
be configured with CF-1 for four telephone channels, and
each of these channels could have a CF-2 four-channel
teletype multiplex equipment.
All these carrier systems were cloned from Western Electric
and the Bell system.  The under-sea telephone systems
usually used a 3000 Hz wide channel for telephone.  Including
the Canadian systems.  AT&T standard was 4000 Hz per
channel.  So there were back-to-back channel banks at
the borders, or at our end of the ocean cables in New Jersey.
The TRC-1 was upgraded by the AN/TCC-7 I think (?)
Milsurplus has seen lots of "Spiral Four", the land line cable
used for CF-1 and CF-2.
EOT:
73  Clete
++++++++++++++++++++++++++++++++++++++++++++++



On 4/23/2012 5:23 PM, Francesco Ledda wrote:
> Yes, they did. FDM systems were still in use in the late 70.
>
>
> Sent from my iPhone
>
>
> On Apr 23, 2012, at 15:46, Ray Fantini<RAFANTINI at salisbury.edu>  wrote:
>
>> Was wondering what it was used for, thought it may be for setting the frequency of the subcarriers on the radios. What were they able to squeeze thru the TRC-1? , four subcarriers? Subcarrier type systems is a technology that probably officially dead now being most everything went to TDM digital, but subcarrier type radio and microwave must have been cutting edge at the time of WW2. Wonder if they had a selective voltmeter or anything like that back then for maintenance?
>> RF
>>
>>
>> -----Original Message-----
>> From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of C.Whitaker
>> Sent: Monday, April 23, 2012 4:07 PM
>> To: milsurplus at mailman.qth.net
>> Subject: Re: [Milsurplus] AN/TRC-1
>>
>> de WB2CPN
>> I have a lot of time with that equipment.
>> The BC-221, in case anyone is a Techie,
>> was for adjusting the channel frequencies of the CF-1 telephone carrier system.
>> It's used only at one end of a link.  The far end adjusts to my carrier frequencies.
>> It's a SSB thing.  Chan 1 was not shifted up.
>> Also have some pictures from Korea 1951.
>> 73  Clete
>> ++++++++++++++++++++++++++++++++++
>>
>>
>> This is a terminal, not a repeater.  The EE-8 is the Order Wire between terminals.
>>
>>
>> On 4/23/2012 11:01 AM, Ray Fantini wrote:
>>> Thought I would bring this up just for people to take a look at, it's a picture of a TRC-1 relay station with receiver, transmitter and rarely seen carrier equipment along with EE-8 and BC-221 Would speculate its maybe in North Africa by the background? Go to:
>>>
>>> http://amfone.net/Amforum/index.php?topic=31173.0
>>>
>>> It's down the page a bit.
>>> RF
>>>
>>>
>>>
>>>
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