Cables, again

[Edward A. Dauer]

I was looking for a source for custom-length VGA cables for a K3-KPA-KAT
combination, and came across a company on the Web called CableWholesale.
Mindful of the cautions on this reflector to use only "straight-through"
cables such as Elecraft's own (which unfortunately do not come in custom
lengths), I inquired of CableWholesale how I could tell from their on-line
catalogue which of their products were straight-through. The reply was
this:  "Sorry but what you are saying isn't correct. All SVGA cables are
wired straight through."  Hmmm.  They used "SVGA" rather than "VGA."  So I
looked that up.  The "S" seems to indicate a superior quality, but the
on-line sites made no mention of a difference as to straight-throughness.
Could any of the EEs out there help me understand this?
Thanks,

Ted, KN1CBR

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[Bruce Beford-4]

You don't need to be a EE to figure this out. All (S)VGA cable are
"straight-thru", in the sense that none of the pins are cross connected.
However, a standard (S)VGA cable does not have all 15 wires connected from
one end to the other, and often the "ground" pins are wired together.

 A simple Google or Bing search of SVGA pinout will show you what I mean.

GL,

Bruce N1RX

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[Charlie T, K3ICH]

Check with MCM Electronics.  They have all sorts of pre-made cables from
simple phono plugs to much more complicated.  Many times I can buy the
pre-made cable with molded on connectors cheaper than I can buy the
connectors.  I've used their HDMI, VGA, XLR etc. cables, as well as various
adapters and never had a bad one.

73, Charlie k3ICH


----- Original Message -----
From: "Bruce Beford" <[hidden email]>
To: <[hidden email]>
Sent: Monday, April 21, 2014 12:38 PM
Subject: Re: [Elecraft] Cables, again

> You don't need to be a EE to figure this out. All (S)VGA cable are
> "straight-thru", in the sense that none of the pins are cross connected.
> However, a standard (S)VGA cable does not have all 15 wires connected from
> one end to the other, and often the "ground" pins are wired together.
>
> A simple Google or Bing search of SVGA pinout will show you what I mean.
>
> GL,
>
> Bruce N1RX
>
> ______________________________________________________________
> Elecraft mailing list
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>
> 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]

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[Edward A. Dauer]

So, what I need to ask is not whether a custom cable is "straight through"
but rather whether all 15 pins are connected, yes?

>
>Message: 22
>Date: Mon, 21 Apr 2014 12:38:11 -0400
>From: "Bruce Beford" <[hidden email]>
>To: <[hidden email]>
>Subject: Re: [Elecraft] Cables, again
>Message-ID: <877749CAF18F4BAD9A31D72C6DB5A824@HPE250f>
>Content-Type: text/plain; charset="us-ascii"
>
>You don't need to be a EE to figure this out. All (S)VGA cable are
>"straight-thru", in the sense that none of the pins are cross connected.
>However, a standard (S)VGA cable does not have all 15 wires connected from
>one end to the other, and often the "ground" pins are wired together.
>
> A simple Google or Bing search of SVGA pinout will show you what I mean.
>
>GL,
>
>Bruce N1RX
>
>

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[Bruce Beford-4]

> So, what I need to ask is not whether a custom cable is "straight through"
> but rather whether all 15 pins are connected, yes?
 
HD15 connectors, straight through, all 15 pins, each isolated from the
others.
Bruce N1RX
 
 

 

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[k6dgw]

Actually, you need to ask two questions:

1.  Are all 15 pins wired through from one end to the other?

2.  Are any of the pins connected together on either end?

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2014 Cal QSO Party 4-5 Oct 2014
- www.cqp.org

On 4/21/2014 11:57 AM, Dauer, Edward wrote:
> So, what I need to ask is not whether a custom cable is "straight through"
> but rather whether all 15 pins are connected, yes?


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[Jim Brown-10]

On 4/21/2014 11:57 AM, Dauer, Edward wrote:
> So, what I need to ask is not whether a custom cable is "straight through"
> but rather whether all 15 pins are connected, yes?

You want a 15-conductor cable, with each conductor wired pin-for-pin
between the DB-15 connectors on both ends, and no connection between
pins. There should also be a shield, connected at each end to the DB-15
shell (and ONLY to the shells).

And "VGA" or "SVGA" should be removed from the discussion -- they
describe a computer video data interchange format that needs fewer than
15 conductors, but uses DB15 connectors as a standard to differentiate
it from other computer cables.

73, Jim K9YC
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[Bruce Beford-4]

Agreed, BUT- You do NOT want DB15 connectors. These cables use HD15
connectors, not DB15. DB15 has two rows of pins. HD15 (high density) has 3
rows.

Bruce N1RX

> And "VGA" or "SVGA" should be removed from the discussion -- they
> describe a computer video data interchange format that needs fewer than
> 15 conductors, but uses DB15 connectors as a standard to differentiate
> it from other computer cables.




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[Phil Salas]

I put together some info on this in an article on my website.  Here’s the direct link:

http://www.ad5x.com/images/Presentations/KlineAuxCable.pdf

Phil – AD5X
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[Lynn W. Taylor, WB6UUT]

You don't want DB-15s because the "B" shell size is too big.

This is a DE connector.

On 4/21/2014 12:59 PM, Bruce Beford wrote:
> Agreed, BUT- You do NOT want DB15 connectors.

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[Bruce Beford-4]

> This is a DE connector.

No. It's an HD15. Phil's (AD5X) pdf document (which he just posted a link
to), is an excellent resource.
Bruce N1RX


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[Jim Brown-10]

On 4/21/2014 1:07 PM, Bruce Beford wrote:
> No. It's an HD15.

Thanks for the correction.

73, Jim
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[Lynn W. Taylor, WB6UUT]

No disrespect to Phil, but Cannon developed the D-Subminiature connector
family, and Cannon calls it a DE-15.

https://en.wikipedia.org/wiki/DE-9#Description.2C_nomenclature.2C_and_variants 
is a fairly good reference.

If you order an HD-15 connector, you'll get a DE-15.  If you order a
DB-15, you'll probably get a DE-15 and not a DA-15.

On 4/21/2014 1:07 PM, Bruce Beford wrote:
>> This is a DE connector.
> No. It's an HD15. Phil's (AD5X) pdf document (which he just posted a link
> to), is an excellent resource.

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[Bruce Beford-4]

Thanks for the reference, Lynn. I have always (for many years) seen these
referred to as high density (HD) D connectors. All the catalogs I have ever
perused called them "D-Sub High Density Connectors".

I appreciate the background material. I think the most important take-away
for this application is DO NOT go looking for DB15 connectors for this
application.

73,
Bruce N1RX

> No disrespect to Phil, but Cannon developed the D-Subminiature connector
> family, and Cannon calls it a DE-15.



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[Don Wilhelm-4]

Bruce and all,

I have seen the 15 pin high density connectors referred to as D-sub15HD,
DB15HD and DE15HD in catalogs.  No matter what the prefix designation,
the "HD" is significant and required.

73,
Don W3FPR

On 4/21/2014 5:05 PM, Bruce Beford wrote:
> Thanks for the reference, Lynn. I have always (for many years) seen these
> referred to as high density (HD) D connectors. All the catalogs I have ever
> perused called them "D-Sub High Density Connectors".
>
>

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