Regarding K3 12v RCA rear socket - many thanks

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Regarding K3 12v RCA rear socket - many thanks

g4urt
To those who replied to my plea...
Many thanks for your input.
Delving further into the rig it seems that when you put an RCA plug into the socket it bends the centre tab down to complete a circuit and gives the 12v....having checked the volts etc there is 12v (fuse is fine) at the base of the RCA but putting a plug in doesn't fully complete the circuit hence no volts going out. That is the derivation of  'switched socket' on rear of rig....
Looks like some minor surgery (bending of tab) to be performed tomorrow!!!
Much obliged to all - you know who you are!!
Thanks, Peter G4URT
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Re: Regarding K3 12v RCA rear socket - many thanks

Guy Olinger K2AV
There also is an issue that caused me a lot of grief until I  figured it
out: some pins on RCA plugs are not long enough to contact the tongues on
some RCA jacks. This could be an issue with the shoulders of the jacks or
the shape of the shell of the plug. But the result is that the pin just
barely, barely makes contact with the tongue, which is a recipe for all
kinds of undesired behavior.

I bought a little bag of simple RCA plugs with a longer pin and I now make
all my RCA pinned cords myself. All the ready-made off the shelf cords have
short pins.

73, Guy K2AV

On Friday, September 16, 2016, <[hidden email]> wrote:

> To those who replied to my plea...
> Many thanks for your input.
> Delving further into the rig it seems that when you put an RCA plug into
> the socket it bends the centre tab down to complete a circuit and gives the
> 12v....having checked the volts etc there is 12v (fuse is fine) at the base
> of the RCA but putting a plug in doesn't fully complete the circuit hence
> no volts going out. That is the derivation of  'switched socket' on rear of
> rig....
> Looks like some minor surgery (bending of tab) to be performed tomorrow!!!
> Much obliged to all - you know who you are!!
> Thanks, Peter G4URT
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email] <javascript:;>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email] <javascript:;>



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Re: Regarding K3 12v RCA rear socket - many thanks

Robin Moseley-2
RCA sockets are designed to grip the centre pin at 4mm inserion..   the
standard pin length is 8.5mm

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Re: Regarding K3 12v RCA rear socket - many thanks

Guy Olinger K2AV
On Friday, September 16, 2016, Robin Moseley <[hidden email]> wrote:

> RCA sockets are designed to grip the centre pin at 4mm inserion..   the
> standard pin length is 8.5mm


Hmm. Then how do you account for

http://www.farnell.com/cad/436556.pdf?_ga=1.267275786.520606856.1474066281

pin 10.1 mm beyond the shell.

http://www.farnell.com/cad/2124889.pdf?_ga=1.29765179.520606856.1474066281

pin 9.6 mm beyond the shell

http://www.digikey.com/product-detail/en/switchcraft-inc/3558-2/SC1136-ND/109664

pin 9.5 mm beyond the shell.

http://www.farnell.com/cad/42767.pdf?_ga=1.258830222.520606856.1474066281

pin 7.0 mm beyond the shell

http://www.farnell.com/cad/302013.pdf?_ga=1.90728094.520606856.1474066281

pin 7.5 mm beyond the shell.

http://www.keyelco.com/product-pdf.cfm?p=3113

pin 6.3 mm beyond the shell.


Standards?  What standards?

I quit having trouble when I started making my own cords with the 10 mm
pins. I use the kind with a wrap around solder connection to the shield
inside the cover. I also use teflon jacketed shielded coax of one size or
another. Very permanent. Very shielded. Never melts when soldering.

Bad cords and connectors are responsible for so much trouble....

73, Guy K2AV
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