[Milsurplus] NOS ARR-15 / ARC-2 connectors

Mon Jun 18 13:09:14 EDT 2018

To answer Robert's question in his 3rd paragraph below.
I did some measurements on the ARR-15 male connector pins and the mating socket contacts.  Also did the same for the K connector #10 contacts.  Obviously there must be a deeper socket depth then the pin length to prevent deforming the socket and keep proper contact tension to allow the socket to grip the pin.  Keep it clean guys!
ARR-15:Socket depth is 0.750 inch maximum below mating interfacePin length is  0.635 inch maximum above mating interfaceDelta = 0.115 inch
K connector:Socket depth: 0.550 inch maximum below mating interfacePin length: 0.400 inch maximum above mating interfaceDelta = 0.150 inch
So to confirm Robert's suspicion, allowances must be made when machining the contact block since the K connector has different interface mating dimensions then the ARR-15's  DPO-24-33S mating connector.
No U-7/U connectors were harmed while taking these measurements.  I like my thumbs just as they are, thank you.Jim

      From: Jim Whartenby <antqradio at sbcglobal.net>
 To: 'Milsurplus' <milsurplus at mailman.qth.net> 
 Sent: Monday, June 18, 2018 10:53 AM
 Subject: Re: [Milsurplus] NOS ARR-15 / ARC-2 connectors

Seems that K connectors are still in production.
http://www.peigenesis.com/en/itt-cannon-connectors/180:itt-cannon-standard-k.html

Since this style connector was used on the ARB receiver and RL-7 intercom, is it safe to say that this connector was the Navy favorite during WW2?  Besides the ARR-15, the ARB and RL-7 are the only Navy items in the collection, that I can think of, at the moment.Jim

      From: Robert Downs via Milsurplus <milsurplus at mailman.qth.net>
 To: 'B. Smith' <smithab11 at comcast.net>; 'Milsurplus' <milsurplus at mailman.qth.net> 
 Sent: Sunday, June 17, 2018 10:35 PM
 Subject: Re: [Milsurplus] NOS ARR-15 / ARC-2 connectors

#yiv6481243203 -- filtered {font-family:Wingdings;panose-1:5 0 0 0 0 0 0 0 0 0;}#yiv6481243203 filtered {panose-1:2 4 5 3 5 4 6 3 2 4;}#yiv6481243203 filtered {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv6481243203 filtered {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv6481243203 p.yiv6481243203MsoNormal, #yiv6481243203 li.yiv6481243203MsoNormal, #yiv6481243203 div.yiv6481243203MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;font-family:New;color:black;}#yiv6481243203 a:link, #yiv6481243203 span.yiv6481243203MsoHyperlink {color:blue;text-decoration:underline;}#yiv6481243203 a:visited, #yiv6481243203 span.yiv6481243203MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv6481243203 span.yiv6481243203EmailStyle17 {color:#1F497D;}#yiv6481243203 .yiv6481243203MsoChpDefault {font-size:10.0pt;}#yiv6481243203 filtered {margin:1.0in 1.0in 1.0in 1.0in;}#yiv6481243203 div.yiv6481243203WordSection1 {}#yiv6481243203 Well, I also did some more looking and actual measurements.  And unfortunately it turns out that the AN, MS, or MIL-C-5015 are not going to be a source for female contacts for making mating connectors for the pins in the connectors on the ARC-2 or ARR-15 radios.  Mike gave the nominal pin diameter as 0.125”.  The #12 pins in the AN are 0.094”  and the next size used is #8, which is about 0.141”.  However, the Cannon K-Series connectors skip from #16 to #10, and the #10 pin averages 0.124”.  Unfortunately, the K-Series aren’t as plentiful as the AN and the #10 contacts, like the #12 in the AN, aren’t that common.  For example, the HV power and control connector for the ATC and AN/ART-13 transmitters and dynamotors, the power and control connector for the TCS transmitter, the power connector for the ARB receiver and ATb transmitter, and several others each have two #10 contacts usually for the +/- 24/28 or 12/14 VDC.   However, anyone caught scrapping eight or ten U-7/U’s will probably get strung up by the thumbs until dead.  So watch out what you rob the contacts from.  J  Not having the rectangular connectors for the ARC-2 or ARR-15, I don’t know how far the male pins stick out and how far down on the males the females will actually go.  So anyone trying to machine the blocks in order to make a mating connector will have to make some careful measurements to see how far to counterbore the female contact holes in the front and rear contact blocks.  And I would suggest that instead of populating all of the holes, populate one at each end plus only the ones that you are going to actually use.  But making the rectangular female contact blocks will be a lot easier than making the circular ones for, for example, a U-7/U.  Robert Downs    Robert Downs  From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Michael Hanz
Sent: Sunday, June 17, 2018 12:24 PM
To: B. Smith; Milsurplus
Subject: Re: [Milsurplus] NOS ARR-15 / ARC-2 connectors  I can share the pin measurements, but it gets a little complicated.  There are actually two connectors in existence - one with a pair of insulating blocks, and one with a single insulating block.  I haven't had time to take apart one with the pair of blocks, but below is a (very) rough sketch of the pin that is used in the .785" thick single block style.  It is designed to accept the .125" diameter male pin in the radio set(s).
Mike  KC4TOSOn 6/17/2018 11:34 AM, B. Smith wrote:
Hi Robert 
What is the source of your insert pins and by chance did you take any pin measurements that you could share with us. 
breck k4che 

On 6/17/2018 12:15 AM, Robert Meadows wrote: 

Just purchase the proper insert pins for pin diameter --readily available 
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