[aprssig] Cat5 jumpers for mic connections

Gerry Creager N5JXS gerry.creager at tamu.edu
Thu Apr 14 08:56:44 EDT 2005

We use Cat5 extensively on our serial connections without problems in my 
Lab.  I've used it, as well, for mic/control head extension on a Yaesu 
FT-8500 without problems.

Using the flat cables ("Silk") is much more likely to fail to prevent 
cross-talk in my experience, in ethernet, serial operations and probably 
audio.  While you've got a bit of an impedence mismatch for audio, you 
have a shielding effect from the twist in UTP.


Jason Winningham wrote:
> 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.
> -Jason
> kg4wsv
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