kxpa100 remoting

[bill.va3ol]

I want to remote my KXPA to the base of my antenna in my RV.

My RV has a storage locker door 2 feed from the rear ladder and would be an
ideal place for the amp/tuner but the interface cable is causing some
problems.  The manual specifies Cat 6 cables that are STP (shielded); max.
25 feet. My search for a cable locally has failed. Without a trusted source
on line I hesitate to pay something in the neighbourhood of $70 cdn for an
unknown  quality cable.

Has anyone tried unshielded cable?; Cat 5E cable?;or whatever!

Any wisdom on the subject would be appreciated.

Bill, VA3OL
Oro-Medonte Township, Ontario
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[Jim Brown-10]

On 8/7/2014 6:52 PM, [hidden email] wrote:
> Has anyone tried unshielded cable?; Cat 5E cable?;or whatever!

All of the unshielded CATx cables have very good immunity to external RF
and noise if each signaling circuit is carried by one of the twisted
pairs. The CATx cable carries RS232, which requires two pairs. The two
remaining pairs connect the key line and logic circuit (ACC2).

In general, a high quality twisted pair is far more important than a
cable shield ff the CATx cable is properly wired (that is, one pair for
each signalling circuit). The primary advantage of is higher CAT spec is
reduced crosstalk between pairs, which is a big deal for Ethernet, but
much less so for applications like this.

73, Jim K9YC
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[James Rogers]

IF the twisted pairs are fed with differential drivers, then the noise
is "common mode" and cancels itself out.  A simple TTL circuit over
twisted pair will still be quite vulnerable to RFI.  Been there done
that for many, many, years in datacomm.

Jim, W4ATK
On 8/7/2014 10:22 PM, Jim Brown wrote:

> On 8/7/2014 6:52 PM, [hidden email] wrote:
>> Has anyone tried unshielded cable?; Cat 5E cable?;or whatever!
>
> All of the unshielded CATx cables have very good immunity to external
> RF and noise if each signaling circuit is carried by one of the
> twisted pairs. The CATx cable carries RS232, which requires two pairs.
> The two remaining pairs connect the key line and logic circuit (ACC2).
>
> In general, a high quality twisted pair is far more important than a
> cable shield ff the CATx cable is properly wired (that is, one pair
> for each signalling circuit). The primary advantage of is higher CAT
> spec is reduced crosstalk between pairs, which is a big deal for
> Ethernet, but much less so for applications like this.
>
> 73, Jim K9YC
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> 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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