question on part

[n3drk]

The male connector for the dc supply on the back of the K2 mates with
the dc power jack. In the manual it states this is a 2.1mm male
connector. What are the inside and outer dimensions?
john
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[John Lonigro]

John:
The OD of the barrel is 5.5mm and the ID is 2.1mm.  There are several dc
power connectors on the market with 5.5 mm OD barrels, but some have a
2.1 mm ID, others are 2.5 mm ID.

Hope this answers your question.

73's,
John AA0VE

n3drk wrote:

> The male connector for the dc supply on the back of the K2 mates with
> the dc power jack. In the manual it states this is a 2.1mm male
> connector. What are the inside and outer dimensions?
> john

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[Tom Hammond-3]

John:

 From a couple years ago.

73,

Tom   N0SS

Date: Fri, 21 Sep 2001 10:19:20 -0500
To: [hidden email]
From: Tom Hammond NØSS <[hidden email]>
Subject: [Elecraft] K2 Coaxial Power Connector - More info

Rod Cerkoney, N0RC, wrote:

>The plug is 5.0/2.1mm OD/ID respectively. RS has them, but I don't
>have the P/N. In store packages have size marked on them. The part
>Elecraft supplies is from Switchcraft and is available from Digikey
>part number: SC-1052-ND (I think the Switchcraft item is of superior
>quality).
>
>The Connector in the radio (probably Switchcraft) is Digikey item:
>SC1155-ND
>
>Digikey online page for these items is:
>
>     http://info.digikey.com/T013/V5/177.pdf

More info:

    Switchcraft #S760, Mouser part #502-S-760

    Technical specs:  ID  .080" (2.03mm), assume 2.1mm
                      OD  .218" (5.5mm) See NOTE below
           Barrel Length  .375" (9.52mm)

Note: Switchcraft does not list a 5.1mm (0.20") diameter
       barrel coaxial power connector. It appears that ALL
       of their coaxial pwr connectors are 5.5mm (0.218")
       in diameter.

       I used a caliper to confirm the outside diameter of
       the barrel of the plug I'd received from Elecraft.
       0.218" (5.5mm) on the button.

For more info on this Switchcraft connector, go to:

    http://www.switchcraft.com/

and search for "S760". The plug dimension specs are at the bottom of this
page, and if you click on selection #2 (760/S760) from the list at the top
of the page, you can download a single-page PDF which shows to detailed
engineering drawing of the plug, with references which will match to the
specs on the page noted above.

I believe this to be the power plug which we are using on our K2s and K1s.
They ARE better quality than the plugs available from R/S, if for no other
reason that the fact that the center cunductor of the Switchcraft plugs is
slightly recessed within the insulator, thus making it more difficult to
accidently short the positive lead to ground.

The apparent R/S equivalent (at least with regard to dimensions, NOT
quality) is their 274-1569 (5.5 x 2.1 mm).

The apparent DigiKey part #'s are:

      Plug SC-1052-ND (as Ron has stated)
    Socket SC-1153-ND (the SC-1155-ND is SMT)

NOTE that the 1998 DigiKey catalog from which I got this info had the
Switchcraft part #'s for the plug and jack SWITCHED. However the DigiKey
web site (www.digikey.com) had everything listed correctly.

Users are urged to RETAIN this information for the future when you will
surely need it. And WILL eventually need it... almost guaranteed!

Thanks Ron,

Tom Hammond   N0SS


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