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

[AKLDGUY]

Hi Jim
Thank you for pointing out the difference between the pins. I did start my
post with the caveat "I don't know whether this is appropriate to the
radios discussed here".

Neil ZL1ANM

On Tuesday, June 19, 2018, Jim Whartenby <antqradio at sbcglobal.net> wrote:

> Neil
> The ARC-5 or SCR-274N is a very different radio then the ARC-2.  The ARC-5
> type connectors have miniature banana contact pins so you are sure to have
> positive contact using your brass tubing work around.  The ARC-2 connector,
> on the other hand, has long straight pins as seen in the second photo.
>
> There is no positive contact between the ARC-2 connector pin and the brass
> tubing if nothing is done to force the issue.  To make matters worse, the
> current drawn by the ARC-2 is considerably higher then that drawn by the
> BC-442 antenna relay.  I don't have a manual for the ARC-2 transceiver but
> the same connector is also used in the ARR-15.  According to the manual,
> the ARR-15 receiver draws 15 amps at dynamotor start up, 8 amps during
> auto-tune and almost 3.5 amps the rest of the time.  All at 28 volts.
>
> The ARR-15 connector pins are silver plated so even when tarnished, they
> can handle the current demand.  The plain brass tubing tarnish is nowhere
> near as conductive as silver plated brass so during high current demand,
> things are going to get pretty hot which will cause more brass oxidation
> which causes more heat and so on until the connection fails
>
> Your idea is OK for a short duration test but will fail eventually if the
> brass tubing is not kept clean, polished and the connector pin to brass
> tightness is not continually adjusted.
> Jim
>
>
> [image: Western Electric BC-442-A Antenna Relay Unit-03 copy.jpg]
> BC-442 connector
>
>
>
>
> ARC-2 / ARR-15 connector
>
>
> ------------------------------
> *From:* AKLDGUY <neilb0627 at gmail.com>
> *To:* milsurplus <milsurplus at mailman.qth.net>
> *Sent:* Monday, June 18, 2018 2:12 PM
> *Subject:* Re: [Milsurplus] NOS ARR-15 / ARC-2 connectors
>
> I don't know whether this is appropriate to the radios discussed here, but
> I am using 1/8 x .014 brass tube to connect to two pins of my BC-442-A
> antenna relay. Made by K & S Precision Metals of Illinois. Catalog # 8127,
> length 12 inches. Nice firm fit, no crimping required. If it can sell in
> a hobby shop for $3.50 here in Auckland, you can bet it's less in the US.
>
> www.ksmetals.com
>
> Neil ZL1ANM
>
>
> On Tuesday, June 19, 2018, Jim Whartenby <antqradio at sbcglobal.net> wrote:
>
> 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!
>
>
>
>
>
>
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