KAT-100 completed

[Tom Zeltwanger]

Just completed and tested a KAT-100 in the EC2 enclosure. Like the K2 and the
KPA-100, I turned it on, and everything worked fine.

I think I may be seeing some digital noise getting into my K2 from the addition
of the outboard tuner. I saw some discussion recently about noise from the RS-
232 cable in the K2. Have others seen any problems with noise when adding the
KAT-100? If so, any tips on minimizing or eliminating it?

73,

Tom KG3V




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[Don Wilhelm-3]

Tom,

The suggestion from Jim Brown was to replace the cable to the computer
with twisted pair cable (CAT-5 will do, but shielded twisted pair is
better)  Both RXD and TXD should be paired with a conductor going to pin
5 (Signal Ground).

If you do not have a computer connected, the computer cable (the RS-232
part of the AUX I/O) is NOT your problem.

The AUX I/O signals between the K2 and the KAT100 are usually not a problem.

Is the KPA100 mounted on the K2 or in the EC2 enclosure with the KAT100?
  If you have the KPA100 mounted on the K2, remove the right side panel
and dress (fold) the ribbon cable and the speaker cable up into the area
above the Control Board.  If left to its own resources, the signals on
the ribbon cable can couple into the KSB2 board.

73,
Don W3FPR

Tom Zeltwanger wrote:
> Just completed and tested a KAT-100 in the EC2 enclosure. Like the K2 and the
> KPA-100, I turned it on, and everything worked fine.
>
> I think I may be seeing some digital noise getting into my K2 from the addition
> of the outboard tuner. I saw some discussion recently about noise from the RS-
> 232 cable in the K2. Have others seen any problems with noise when adding the
> KAT-100? If so, any tips on minimizing or eliminating it?
>
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[Tom Zeltwanger]

Don,

Thanks for the suggestions. At this point I have just the KAT100 in the EC2
enclosure. I do not currently have a PC connected, so it was the AUX connection
I was wondering about. I will clean up the ribbon cable and make sure it is not
near the KSB2 board. I need to do some more checking to see just how bad this
noise really is - it was not that strong but was noticable.

When I add the PC I probably will change the cable to something with shielded
twiested pairs.

73,

Tom KG3V



Quoting Don Wilhelm <[hidden email]>:

> Tom,
>
> The suggestion from Jim Brown was to replace the cable to the computer
> with twisted pair cable (CAT-5 will do, but shielded twisted pair is
> better)  Both RXD and TXD should be paired with a conductor going to pin
> 5 (Signal Ground).
>
> If you do not have a computer connected, the computer cable (the RS-232
> part of the AUX I/O) is NOT your problem.
>
> The AUX I/O signals between the K2 and the KAT100 are usually not a problem.
>
> Is the KPA100 mounted on the K2 or in the EC2 enclosure with the KAT100?
>   If you have the KPA100 mounted on the K2, remove the right side panel
> and dress (fold) the ribbon cable and the speaker cable up into the area
> above the Control Board.  If left to its own resources, the signals on
> the ribbon cable can couple into the KSB2 board.
>
> 73,
> Don W3FPR
>
> Tom Zeltwanger wrote:
> > Just completed and tested a KAT-100 in the EC2 enclosure. Like the K2 and
> the
> > KPA-100, I turned it on, and everything worked fine.
> >
> > I think I may be seeing some digital noise getting into my K2 from the
> addition
> > of the outboard tuner. I saw some discussion recently about noise from the
> RS-
> > 232 cable in the K2. Have others seen any problems with noise when adding
> the
> > KAT-100? If so, any tips on minimizing or eliminating it?
> >
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft   
>
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> Elecraft web page: http://www.elecraft.com
>

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