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radios => all radio related topics => Topic started by: Tapper02 on June 30, 2016, 02:11:01 AM

Title: Radio terminal boxes
Post by: Tapper02 on June 30, 2016, 02:11:01 AM
Okay fellas….I'm in need of three (3) radio terminal boxes to install the radios in my halftrack. 

From the TM 11-2721, Installation of Radio and Facsimile Equipment in CARRIER, PERSONNEL, HALF-TRACK, M3A1, it states that the terminal box (Item 32 in the diagram below) was "furnished with the vehicle by the manufacturer".  Referencing the ORD 9 SNL G-102, on page 161, I found a listing for a "BOX, terminal" with a Ordnance Stock Number of G102-0400177, Ordnance Part number of B-184415 and a Manufacturer Part number of DR-1884010 indicating that it was made by Delco-Remy. 

Does anyone know of a source?  I've hit up the local US radio guys (Fair Radio, etc) as well as S.M.I and Cotatel over in Europe.  Takeoffs are fine as long as they are usable…I don't want to take chances with electrical issues.  Below are a few pics as well (thanks Steve A.).  I'll probably post on the G as well for a wider audience.  TIA!

-Tom

(http://i60.photobucket.com/albums/h39/Tapper02/Misc%20Shared%20Pics/SCR-508%20install%20diagram%20pg%20602_zps12qwglog.jpg) (http://s60.photobucket.com/user/Tapper02/media/Misc%20Shared%20Pics/SCR-508%20install%20diagram%20pg%20602_zps12qwglog.jpg.html)
(http://i60.photobucket.com/albums/h39/Tapper02/Halftrack/attachment_zpsxn8ke6ig.jpg) (http://s60.photobucket.com/user/Tapper02/media/Halftrack/attachment_zpsxn8ke6ig.jpg.html)
(http://i60.photobucket.com/albums/h39/Tapper02/Halftrack/attachment-2_zpssqbeunex.jpg) (http://s60.photobucket.com/user/Tapper02/media/Halftrack/attachment-2_zpssqbeunex.jpg.html)
Title: Re: Radio terminal boxes
Post by: steve1973 on June 30, 2016, 05:49:56 AM
I have an original as in the photos above that I have reproduced with cover. They were not cheep to make but can get more made if interested. I will get some photos of it tonight. One thing to point out the M2 box is square and mounted on the floor of the storage locker. The one used for the M3 is rectangular and mounted on the side in the storage locker. If this isn't a big deal let me know. M16 used a square one mounted under the passenger'side front seat. I do not have any spare terminal straps for these boxes.

Steve A.
Title: Re: Radio terminal boxes
Post by: Tapper02 on June 30, 2016, 06:18:11 AM
Steve,
  Out of curiosity, do you have the measurements for the M3 version?  If I can't find originals, then I'll probably take you up on the offer to have them made… but to M3 specs if possible.  Thanks!

-Tom
Title: Re: Radio terminal boxes
Post by: steve1973 on July 02, 2016, 10:52:58 PM
Hi Tom,
I do not have any info of the M3 version. I've seen a photo of one still in a project halftrack before but couldn't find it again. here is a photo of what I have.

(http://www.surfacezero.com/g503/data/500/medium/DSCN3314.JPG)

The box on the left is my NOS box like in your photo.

The box in the center in my reproduction.

The box on the right is a take out from an M16. Was mounted under the passenger's front seat.

You only need one box for each halftrack. The box is the terminal junction between the battery and the radio(s). You have a main harness in conduit from the battery to this box. Then you have wiring from each radio going to this box as seen in radio manuals. As for the price for the reproduction it is between $100-200. Thew were a bit time consuming to make. If anyone else want one I can try to get a batch order done. Might be a little cheaper that way. Let me know.

Steve A.
Title: Re: Radio terminal boxes
Post by: steve1973 on February 14, 2017, 03:54:55 AM
Here is a photo of an M3 terminal box. They were mounted on the vertical track armor on the right side where the M2's were on the left side inner floor (sheet metal). The ones I've seen in M2's and M16's are square. The ones for M3's are rectangular. These boxes are factory installed items.

http://www.surfacezero.com/g503/data/500/M3_halftrack_radio_junction_box.jpg

Steve A.
Title: Re: Radio terminal boxes
Post by: col.halftrack on February 14, 2017, 01:06:33 PM
 Steve the photo is of the right hand side of a M2A1 I believe?
Title: Re: Radio terminal boxes
Post by: yd328 on February 19, 2017, 07:14:37 PM
Yep, the Colonel is correct that is a M2a1 pic. Its my right side box ;D

Gary
Title: Re: Radio terminal boxes
Post by: steve1973 on February 19, 2017, 07:21:50 PM
OK, I'm wrong about the halftrack model. It is interesting that an M2A1 has a box that is more commonly found in an M3/M3A1.

Steve A.
Title: Re: Radio terminal boxes
Post by: yd328 on February 19, 2017, 07:50:15 PM
I have one mounted each side with a single wire connecting the two. There was also a large cable in the right box.

Gary
Title: Re: Radio terminal boxes
Post by: Tapper02 on February 20, 2017, 02:41:44 AM
Glad to see this come up again.  I bought what I thought was the right part about 8 months ago, and just pulled it out of the box to look at it again.  Unfortunately it doesn't have the same internal configuration as the ones you guys have and the part numbers don't match what I listed above.  The box part number is C100444 and the internal part is B 209140.
What IS interesting is that this is exactly like the two terminal boxes that Gary (yd328) removed from his M2A1 during restoration.  See pic below of his (reposted from his thread)...followed by pics of my new one.  I'm thoroughly confused.  Thoughts??

Gary's terminal boxes:
(http://i60.photobucket.com/albums/h39/Tapper02/Radio%20Terminal%20Boxes%20edit_zpsagzhmpus.jpg) (http://s60.photobucket.com/user/Tapper02/media/Radio%20Terminal%20Boxes%20edit_zpsagzhmpus.jpg.html)

New terminal box:
(http://i60.photobucket.com/albums/h39/Tapper02/Halftrack/radio%20terminal%20box_zpsqitaeexg.jpg) (http://s60.photobucket.com/user/Tapper02/media/Halftrack/radio%20terminal%20box_zpsqitaeexg.jpg.html)
(http://i60.photobucket.com/albums/h39/Tapper02/Halftrack/radio%20terminal%20box%20side%20closeup_zps5edffsos.jpg) (http://s60.photobucket.com/user/Tapper02/media/Halftrack/radio%20terminal%20box%20side%20closeup_zps5edffsos.jpg.html)
(http://i60.photobucket.com/albums/h39/Tapper02/Halftrack/radio%20terminal%20box%20internal%20shot_zpslfxasfpr.jpg) (http://s60.photobucket.com/user/Tapper02/media/Halftrack/radio%20terminal%20box%20internal%20shot_zpslfxasfpr.jpg.html)
(http://i60.photobucket.com/albums/h39/Tapper02/Halftrack/radio%20teminal%20box%20width%20dimensions_zpsf7jgrzcf.jpg) (http://s60.photobucket.com/user/Tapper02/media/Halftrack/radio%20teminal%20box%20width%20dimensions_zpsf7jgrzcf.jpg.html)
(http://i60.photobucket.com/albums/h39/Tapper02/Halftrack/radio%20terminal%20box%20height%20dimensions_zpsygaquamu.jpg) (http://s60.photobucket.com/user/Tapper02/media/Halftrack/radio%20terminal%20box%20height%20dimensions_zpsygaquamu.jpg.html)
(http://i60.photobucket.com/albums/h39/Tapper02/Halftrack/radio%20terminal%20box%20depth%20dimensions_zpsikr2ifhv.jpg) (http://s60.photobucket.com/user/Tapper02/media/Halftrack/radio%20terminal%20box%20depth%20dimensions_zpsikr2ifhv.jpg.html)

-Tom
Title: Re: Radio terminal boxes
Post by: Outsider on February 20, 2017, 07:41:51 AM
The box with only two large terminals is a main power supply box. My guess is that the other box in the inter-connection box to connect all the mics and speakers in the HT.

My 2 cents,
Steve
Title: Re: Radio terminal boxes
Post by: brian in denver on September 13, 2017, 01:09:20 PM
those large boxes look almost the same as the dodge carryall boxes.  I know on the SCR-193 radio theres a bunch of interconnect wires that feed in and out of the the J-box, and hook into a buss bar. TM-183 if i remember.

http://www.radionerds.com/index.php/TM_-_Terminal

anybody know if a "radio shack block will fit ?

BB
Title: Re: Radio terminal boxes
Post by: Tapper02 on October 07, 2017, 06:38:53 PM
Brian,
  Good call.  Are you talking about the HO-17?  I'll have to dig into how they are wired up...maybe find an alternative.

-Tom
Title: Re: Radio terminal boxes
Post by: Tapper02 on October 08, 2017, 05:05:20 AM
The box with only two large terminals is a main power supply box. My guess is that the other box in the inter-connection box to connect all the mics and speakers in the HT.

My 2 cents,
Steve

Steve,
  That makes sense since the boxes I am looking for are to route the power supply from the battery to the different radios installed and not to cross-connect the radios' comms.  Getting closer....
Title: Re: Radio terminal boxes
Post by: yd328 on October 08, 2017, 05:44:29 AM
Does anyone know if these boxes are painted or just left bare metal?

Thanks Gary

Title: Re: Radio terminal boxes
Post by: steve1973 on October 08, 2017, 06:02:53 AM
My original I think is galvanized. My reproduction I had made is zinc plated.

Steve A.
Title: Re: Radio terminal boxes
Post by: brian in denver on October 08, 2017, 09:41:21 AM
Brian,
  Good call.  Are you talking about the HO-17?  I'll have to dig into how they are wired up...maybe find an alternative.

-Tom

no the ho-17 is the SCR-399,  the -193 is smaller, but they used the box to connect in the intercom in some cases.

I measured the carrall posts and came up with 5" inches between the screw holes.  now will have to go look for terminal block specs.

BB

Title: Re: Radio terminal boxes
Post by: brian in denver on October 08, 2017, 09:43:21 AM
My original I think is galvanized. My reproduction I had made is zinc plated.

Steve A.

the Jeep guys have a hole thing about how there painted.  for some reason it sticks in my mind they had a special coating (lead) ? on the inside.

http://g503.com/forums/viewtopic.php?p=479706

BB
Title: Re: Radio terminal boxes
Post by: brian in denver on October 08, 2017, 10:03:17 AM
dog gone, close but not a banana

https://www.mcmaster.com/#7527k32/=19q2xh3

5.50 between post holes  :'(

BB

Im guessing thats all there is on the market, unless somebody has found one that fits ?

Title: Re: Radio terminal boxes
Post by: Outsider on October 08, 2017, 10:09:28 AM
Hot dipped galvanized is form of lead coating. That is why you are not supposed to cut or weld it without special equipment.

Steve
Title: Re: Radio terminal boxes
Post by: yd328 on October 10, 2017, 11:02:45 AM
Here are some more pictures of the junction boxes I pulled out of my halftrack. My track had a SCR 506, 510 and RC-58. I assume power distribution. The main heavy cable was on the passenger side and connected to the left box. Both boxes also have wired grounds to the frame. I don't know if anyone can add any more info on these. 

Gary
(http://www.surfacezero.com/g503/data/500/medium/IMG_46944.JPG) (http://www.surfacezero.com/g503/showphoto.php?photo=244792&title=img-46944&cat=500)
(http://www.surfacezero.com/g503/data/500/medium/IMG_46991.JPG) (http://www.surfacezero.com/g503/showphoto.php?photo=244795&title=img-46991&cat=500)
The capacitor
(http://www.surfacezero.com/g503/data/500/medium/IMG_46962.JPG) (http://www.surfacezero.com/g503/showphoto.php?photo=244794&title=img-46962&cat=500)
(http://www.surfacezero.com/g503/data/500/medium/IMG_46953.JPG) (http://www.surfacezero.com/g503/showphoto.php?photo=244793&title=img-46953&cat=500)
Title: Re: Radio terminal boxes
Post by: steve1973 on October 10, 2017, 11:46:58 AM
Very interesting. Thanks for posting.

Steve A.
Title: Re: Radio terminal boxes
Post by: brian in denver on October 10, 2017, 03:55:33 PM
look like the standard jeep/weasel box,  would work ok with the small sets,  but not the SCR-193/CH-60 set up. and you could probably only run one radio out of it.

also that size box but with different guts, is used in sherman intercom application.

we have a steel flex conduit thats NOS, which should run from the battery box to the J-box.  from the J-box to the radio should be a heavy rubber cord.

are you saying that the flex conduit is a jumper between the two boxes ?

BB
Title: Re: Radio terminal boxes
Post by: brian in denver on October 10, 2017, 04:06:26 PM
I dont know, the use of braided flex, for the battery end is possible,  might depend on the Mfgr.

interesting that there is only a hot wire. on the dodges  theres also a ground straight to the battery as well. and then the jumper to the frame.

could be they finally figured out they didnt need the primary ground.

BB
Title: Re: Radio terminal boxes
Post by: yd328 on October 10, 2017, 05:43:49 PM
Quote
are you saying that the flex conduit is a jumper between the two boxes ?

Yes, The cable ran under the body to the positive posts in the boxes. The large cable went through about a one inch hole in the storage compartment floor. But all that is left of it is a frayed end with no indication where it may have went.

Gary
Title: Re: Radio terminal boxes
Post by: Tapper02 on May 06, 2018, 11:01:52 AM
Here are some more pictures of the junction boxes I pulled out of my halftrack. My track had a SCR 506, 510 and RC-58. I assume power distribution. The main heavy cable was on the passenger side and connected to the left box. Both boxes also have wired grounds to the frame. I don't know if anyone can add any more info on these. 

Gary
The capacitor
(http://www.surfacezero.com/g503/data/500/medium/IMG_46962.JPG) (http://www.surfacezero.com/g503/showphoto.php?photo=244794&title=img-46962&cat=500)
(http://www.surfacezero.com/g503/data/500/medium/IMG_46953.JPG) (http://www.surfacezero.com/g503/showphoto.php?photo=244793&title=img-46953&cat=500)

Gary,
  Have you found replacement capacitors yet?

Anyone else know a modern day replacement for these?

-Tom
Title: Re: Radio terminal boxes
Post by: yd328 on May 07, 2018, 04:02:04 PM
Hello Tom,
I have not found replacements other than some modern capacitors of similar ratings when I googled them. There are different types and I'm not sure which would be appropriate. Maybe I'll post over on the G see if one of the radio guys has a suggestion.

Gary
Title: Re: Radio terminal boxes
Post by: brian in denver on April 01, 2020, 04:44:00 PM
this is the terminal strip that is supposed to go in the big boxes. for SCR-193

https://www.radionerds.com/index.php/TM-183

the cord that connects the transmitter to the receiver, goes in and out of the big box.
its a pain. but I guess they never produced a one piece cord, to just jump across.


Title: Re: Radio terminal boxes
Post by: brian in denver on January 12, 2021, 04:33:06 PM
theres a hole thing on them in Jeep draw ?

bla bla lead coating or something  the outside is painted if thats what you mean.

BB
Title: Re: Radio terminal boxes
Post by: sylvain on January 14, 2021, 11:16:02 PM
hello, would it be possible to have other photos and the dimensions of the cables? I normaly have two vertical terminal box, how were the boxes fixed? on a bent sheet? I would like to put it back on my half but I have nothing left. thank you
Sly
Title: Re: Radio terminal boxes
Post by: yd328 on January 25, 2021, 11:29:36 AM
(http://www.surfacezero.com/g503/data/500/medium/IMG_42053.JPG)
(http://www.surfacezero.com/g503/data/500/medium/IMG_42063.JPG)

Here they are mounted. They are mounted to a piece of 1/4" plate that is welded to the vertical track armor. They are placed in the front of the compartment under the troop seats. The armored cable going from box to box is similar to bx cable.

Gary