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[aprssig] Cat5 jumpers for mic connections

Jim Andrews jim at stuckinthemud.org
Thu Apr 14 10:55:17 UTC 2005

I've used standard UTP patch leads to extend the Mic on my D700 (up to 5m),
never had an interference problem.

Head was extended using 2-pair phone cable, again with no problem. Did not
consider which pair I was using where, so maybe the clock and data were on
different pairs.

Unless you are going to be in an environment that you know to generate a lot of
interference, UTP is fine.


-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Jason Winningham
Sent: 14 April 2005 11:45
To: TAPR APRS Mailing List
Subject: Re: [aprssig] Cat5 jumpers for mic connections

On Apr 13, 2005, at 9:23 PM, <scott at opentrac.org> wrote:

> For radios using an RJ-45 jack for the mic connector, is there any
> advantage
> to using shielded twisted pair when connecting a tracker?

I use RJ45 to DB-x connectors for my server connections, and some
recommend _not_ using twisted pair for RS232 because it can introduce
crosstalk that untwisted cables wouldn't.  I have no idea if this is
true for RS232 or extending a mic/control head.

For 3', I don't think it would matter.

I used a flat 8 conductor phone cable to extend my D700 mic cable.

I think I saw some STP at www.bgmicro.com once upon a time.  I can't
remember the length.


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