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Author Topic: Signalink - shielded cable needed?  (Read 7628 times)
AA1RU
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Posts: 4




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« on: March 12, 2011, 08:39:56 AM »

Hello All,

I recently purchased a used Signalink USB which came with a radio cable that does not fit my own rig (an aging Kenwood ts50) - so I am making my own .  I'm planning on using a cat5/cat5e patch cable for this.  Most cat5 is UTP, or unshielded twisted pair.  I'm wondering if I need STP (shielded twisted pair), which is less common (and I don't happen to have any).  I'd prefer to build it right the first time, rather than use UTP and find RF interferes with operation.

I eyeballed the radio cable that came with unit, which has a 6 pin mini din, and the cable has no markings... not easy to discern if it is shielded.  On the RJ-45 end, the plug is clear plastic, and I don't see any foil or drain line... so I think it might be unshielded... I don't want to cut this cable - I prefer keep it intact so that it's ready to go if I get a new rig that uses the mini din connector.

Has anyone done this with UTP? Any issues/regrets?

Thanks,
Jeremy
AA1RU
« Last Edit: March 12, 2011, 08:45:07 AM by AA1RU » Logged
KS2G
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Posts: 368




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« Reply #1 on: March 12, 2011, 11:55:45 AM »

Jeremy,

Why don't you save yourself potential grief and either cut the DIN connector off the cable you have, or purchase an un-terminated cable from Tigertronics:

SLCABNC - Un-terminated cable (bare wires on radio end) for building your own cable

73,
Mel - KS2G
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KD8KCH
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Posts: 21




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« Reply #2 on: March 12, 2011, 05:51:32 PM »

Why not slide the boot off the din and you will be able to see all wires better than in the RJ45.
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VA7CPC
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Posts: 2358




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« Reply #3 on: March 13, 2011, 06:29:08 AM »

Rather than worry about shielding, get a ferrite core (clip-on or not) and put a few turns of the cable through the core.  I'd put the core close to the rig end of the cable.

That will fix most RFI problems.

Consider doing the same thing to the USB cable.  I just had some trouble with a USB-to-serial adapter -- needed three turns through a large clip-on ferrite to fix an "RF-in-the-shack" problem.

              Charles
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