[Elecraft] K3 Accessory Connector

[John Huggins]

Charles Harpole wrote:

> So called  " D connectors" have design specifications issued by 
> various mfg of them.  Most list a limited life of 10 to 30 plug/unplug 
> cycles.  That is from the designers.  Of course, hams often push 
> design specs well beyond those published...

10-30 plug/unplug cycles is for those who use cheap components and/or 
don't expect the need for many cycles (a printer for example).

If there is concern about cycling lifetime, consider using a D-Shell or 
HD D-Shell that complies with MIL-DTL-24308; Cycling lifetime is much 
higher that the 10-30.

  http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MIL-DTL-24308/dtl24308.pdf

They are available and are more robust models of the classic D-Shells.  
They have been around for many decades now and are a fine choice.

>
> but much more than reliability is the issue of USE-ABILITY.  The K3 is 
> a field radio and under the most remote and demanding condx, anderson 
> Powerpole and these D thingies are the first frustrations.... 
> UNLESS.... If u have
> 1. steady soldering hands
> 2. very good eyesight
> 3.  extra patience
> 4.  proper small soldering tools
> 5. a proper crimper
> 6. extra care when plugging and unplugging, and
> 7.  a large parts store locally in ur area,

Granted, but even the most modest electrical/electronics workbench has 
at least some of these items and once you have your cables complete and 
made with good components and, perhaps, include a spare set, you should 
be good to go.

>
> THEN, you can welcome these toy (D) or non standard (APP) connectors.

Cheap D-Shell connectors are toys.  Good D-Shell connectors are good 
enough for harsh military conditions and are certainly not toys.  
Anderson Power Poles have become a standard.

> What is better, altho old stuff--- Cinch Jones (or even Molex) and 
> below that, screw terminal strips and/or  binding posts.  If u r stuck 
> with only bare wire and MUST make a connection, sticking a bare wire 
> tip into a Jones socket is DO-ABLE, or even into a Molex.... try that 
> with D s and even with the APPs.

Old has its place, but has its costs and frequently ignores valid progress.

>
> The JA folks who gave us DIN connectors are now roasting in Small 
> Connector Hell, where they have to solder 30 pin DINs with the firey 
> heat of their bare fingers and are dipped bodily into molten solder 
> for every mistake.

Hahahaha... I think I agree with you on this one.