Re: [Elecraft] RFI Update

[Joe Subich, W4TV]

 > In other words, I could hear myself running my fingers across the
 > connector in the headphones.  I unscrewed the jack-screws and the
 > problem disappeared.

Unscrewing the jack-screws provided a mechanical strain relief between
the plug and the KIO3.  I would bet the problem still exists in the
KIO3 you are just no longer exciting the problem because you removed
the screws.

 > MicroHam pots the inside of the connector with white RTV, so it is
 > impossible to know if there is any sort of ground pin issue.

Rig control would not work if there were a ground pin issue since the
signal ground (pin 5) and frame ground are separate (according to the
schematics).  You can always check the pin 5 connection on the micro-
HAM cable (cable schematics are available on the web site but look
for continuity between pin 5 of the DB9 and shell of the DB37).

BY the way, the silicone potting is added strain relief ... too many
users insist on disconnecting cables by pulling on the wires and not
the connector (plug) bodies.  Even though the cables have always used
the crimped and/or clamped strain reliefs in the various plugs, adding
the silicone potting has significantly decreased the incidence of
failure in the field.

73,

... Joe, W4TV

On 7/4/2010 12:58 PM, K5RC wrote:
> The problem was isolated to the CAT plug. The only way I found it was that
> when I physically touched the shell it was microphonic. In other words, I
> could hear myself running my fingers across the connector in the headphones.
> I unscrewed the jack-screws and the problem disappeared. MicroHam pots the
> inside of the connector with white RTV, so it is impossible to know if there
> is any sort of ground pin issue.
>
>
>
> Thanks to all who sent suggestions, especially Rene at Elecraft.
>
>
>
> Tom Taormina, K5RC
>
> Virginia City NV
>
> Home of W7RN and K7RC
>
>     http://k5rc.cc   FOC 1760
>
> "Communication is the problem to the answer" - 10cc
>
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Re: [Elecraft] RFI Update

[GD0TEP]

>> MicroHam pots the inside of the connector with white RTV, so it is
impossible to know if there is any sort of ground pin issue.

Yes, they do... But, it pulls off quite easy, and what's left I have removed
with an old stiff tooth brush.


73,
Andy
http://gd0tep.com




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[Elecraft] RFI Update

[K5RC]

The problem was isolated to the CAT plug. The only way I found it was that
when I physically touched the shell it was microphonic. In other words, I
could hear myself running my fingers across the connector in the headphones.
I unscrewed the jack-screws and the problem disappeared. MicroHam pots the
inside of the connector with white RTV, so it is impossible to know if there
is any sort of ground pin issue.

 

Thanks to all who sent suggestions, especially Rene at Elecraft.

 

Tom Taormina, K5RC

Virginia City NV

Home of W7RN and K7RC

  http://k5rc.cc   FOC 1760

"Communication is the problem to the answer" - 10cc

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