[ARC5] Re: ARC5 Digest, Vol 43, Issue 23

Tue Aug 28 04:49:42 EDT 2007

Hi, Here is the original AN-08-10-195, text from the T-126/ARC-5. I did have 
two but I sold one a while ago, The contract is NX sa 91970 and my one is 
serial 0061, I cannot remember the other serial but it was not very high. 
The text is as follows:- Throughout the following text the VHF transmitter 
refered to is RADIO TRANSMITTER T-23/ARC-5. The descriptive material and the 
instructions for use of this transmitter apply equally to RADIO TRANSMITTER 
T-126/ARC-5 in all respects except the two features outlined below. 1. 
FREQUENCY RANGE  RT T-23, CH A 100-124, CH B 122-146, CH C 122-146, CH D 
132-156. MHZ. :: RT T-126, CH A 100-124, CH B 100-124, CH C 100-124, CH D 
122-146.MHZ.
2 COMPONENT PARTS, The tuning coil assemblies in turrets Z-301, Z-302, and 
Z-303 of radio transmitter T-126/ARC-5 differ from those described in this 
text but all other component parts are identical. The following tuning coil 
assemblies are used in Radio Transmitter T-126/ARC-5 (Refer to table of 
replaceable parts page 96.) Coil assemblies used : TURRET Z-301 CH A 
ES-693863, CH B ES-693863, CH C ES-693863, CH D ES-693864.
TURRET  Z-302 CH A ES-695797, CH B ES-695797, CH C ES-695797, CH D 
ES-695836.
TURRET  Z-303 CH A ES-695798, CH B ES-695798, CH C ES-695798, CH D 
ES-ES-695838, DATED 1 MAY 1945, If anyone wants a copy of this please email 
me and I'll send you a copy, 73 Max M0GHQ

----- Original Message ----- 
From: <arc5-request at mailman.qth.net>
To: <arc5 at mailman.qth.net>
Sent: Tuesday, August 28, 2007 9:01 AM
Subject: ARC5 Digest, Vol 43, Issue 23

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> Today's Topics:
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>   1. Re: T-126? (David Stinson)
>   2. Re: T-126? (Mike Morrow)
>   3. Re: Connector question. (Mike Morrow)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 27 Aug 2007 09:45:21 -0500
> From: "David Stinson" <arc5 at ix.netcom.com>
> Subject: Re: [ARC5] T-126?
> To: "arc5" <arc5 at mailman.qth.net>
> Message-ID: <013f01c7e8b8$eaa84030$6401a8c0 at boudreaux>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
>
> ----- Original Message ----- 
> From: "Michael Tauson" <kongomt at gmail.com>
> Subject: [ARC5] T-126?
>
>
>> Hi, Folks,
>>
>> I came across a reference to a T-126/ARC-5 which apparently was a T-23
>>... Has anyone here ever
>> heard of one and, if so, when were they made?
>
> The T-126/ARC-5 is real.  It is a redesigned T-23,
> which allows the same freq range on all four channels;
> the original scheme caused a lot of problems with "90-day wonder" radio
> techs.
> IIRC, instead of the 100-150 Mc split up between channels, the T-126s
> channels
> all tuned something like 110-148 Mc (don't remember for sure).
> It was made by Western Electric under Navy contract NXsa-91970,
> which would place its production around mid-1945.
>
> 73 Dave S.
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 27 Aug 2007 10:08:32 -0500 (GMT-05:00)
> From: Mike Morrow <kk5f at earthlink.net>
> Subject: Re: [ARC5] T-126?
> To: Michael Tauson <kongomt at gmail.com>, arc5 <arc5 at mailman.qth.net>
> Message-ID:
> <208682.1188227313123.JavaMail.root at elwamui-huard.atl.sa.earthlink.net>
>
> Content-Type: text/plain; charset=UTF-8
>
>>I came across a reference to a T-126/ARC-5 which apparently was a T-23
>>redone to group all the channels toward the lower end of the range.  I
>>don't know whether I should buy into it or not.  Has anyone here ever
>>heard of one and, if so, when were they made?
>
> The T-126/ARC-5 definitely exists.  I've seen one in real life years ago, 
> and several "on the web."  The last one I saw was being auctioned on ebay 
> a couple of years ago by Max, art13a.
>
> The T-23 can only have one each of its four channels in the four separate 
> bands which span a limited sub-segment within the total 100 to 156 MHz 
> coverage.  It is not *generally* possible to have two or more channels in 
> any one of the four bands (outside segment overlaps).  If I recall 
> correctly, the first and second segments of the T-23 and T-126 are 
> identical, while the third segment of the T-126 repeats its second.  I 
> think the fourth segment of the T-126 is the same as the third segment of 
> the T-23.  I could be wrong on which T-23 segments were repeated on the 
> T-126, for I can't find my notes on this.  But this all makes sense, since 
> the most commonly used VHF-AM frequencies tended to be in the lower half 
> of the 100 to 156 MHz range, while the high range coverage became disused. 
> From the factory, T-23 (and R-28) units seem to have been set for:
>
> Channel  Freq-MHz
>  A      116.10
>  B      126.18
>  C      140.58
>  D      142.74
>
> Many SCR-522 units were similarly set.  Channels C and D were also 
> standard for the RT-19/ARC-4.
>
> Judging from the assignment of the T-126 nomenclature, I'd estimate that 
> the T-126 was very late- or early post- WWII issue.  I've never seen any 
> AN/ARC-5 documentation for the T-126.
>
> If I can find any T-126 info, I'll let you know.
>
> Mike / KK5F
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 27 Aug 2007 10:34:26 -0500 (GMT-05:00)
> From: Mike Morrow <kk5f at earthlink.net>
> Subject: Re: [ARC5] Connector question.
> To: telegrapher at att.net, ARC5 at mailman.qth.net
> Message-ID:
> <19242148.1188228866283.JavaMail.root at elwamui-huard.atl.sa.earthlink.net>
>
> Content-Type: text/plain; charset=UTF-8
>
>>An 8 pin connector like the PL-152A that has the markings MX-2/ARR-2 on
>>the cap which covers the place where the wires are supposed to come out
>>the back of it.  On the side of the body it says: CZR30617-1.  ANyone
>>know where this might have been used?
>
> Originally it was used with the R-4/ARR-2 homing receiver when mounted in 
> the early single receiver rack MT-7/ARR-2, which did not have an A-B audio 
> bus select switch in front.  This plug made up connections 1 to 6 to 
> complete the 28 vdc power circuit to the R-4, and pins 5 to 8 to connect 
> the R-4 audio output to audio bus B.
>
> The plug's audio circuit wasn't really needed after the MT-7A/ARR-2 was 
> developed, since that rack has the common A-B switch on the front. 
> However, it still was commonly used in place of the A.R.C. 6787 wired plug 
> (pins 1 to 6) for local LF/MF/HF receiver control or R-4 remote control in 
> a rack with an A-B switch.  The AN/ARC-5 manuals say that, in that case, 
> the connection between pins 5 and 8 should be lifted, but the several that 
> I have are still factory stock configuration.
>
>>Sounds like it took the place of a PL-152A on the back of the receiver
>>rack when an ARR-2 was installed.
>
> Exactly.
>
> Mike / KK5F
>
>
> ------------------------------
>
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> End of ARC5 Digest, Vol 43, Issue 23
> ************************************
> 