Let me take a quick look around I think i have plans for a coax tester that can be trivialy modified.<br><br><div class="gmail_quote">On Thu, Jul 2, 2009 at 3:38 PM, Bryan Baker <span dir="ltr"><<a href="mailto:ka_klick@mac.com">ka_klick@mac.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Oops, I meant 1/4"<br>
Actually, come to think of it that's the same as a regular TRS cable<br>
used in a lot of patch bays etc, so there may be existing audio test<br>
boxes out there (I know for sure there are for Mic Cables). You could<br>
probably adapt a Mic cable tester by using Female 1/4" TRS->XLR (mic<br>
cable) adapters<br>
<div><div></div><div class="h5"><br>
<br>
On Jul 2, 2009, at 3:33 PM, Bryan Baker wrote:<br>
> For those a multi meter should be pretty easy to use, just set to<br>
> continuity, touch one lead to each tip, then each ring then each<br>
> sleeve.<br>
><br>
> You could also build something w/ 2 1/8" stereo jacks, a battery, some<br>
> LEDs and iirc, you'll also need some resistors, to get the LEDs to<br>
> work, but it should be a pretty easy circuit to just light an LED for<br>
> each of the conductors if contact is made. I'm just rusty enough, I<br>
> can't draw you the schematic, but it should be pretty basic.<br>
><br>
><br>
> On Jul 2, 2009, at 3:23 PM, David Champion wrote:<br>
>> For you electronics gurus out there...<br>
>><br>
>> For our SCCA autocross timers, we have a set of cables that go from<br>
>> the<br>
>> timer head unit, to a photo sensor head out on the course (similar<br>
>> to a<br>
>> garage door safety sensor, bounces a light off a reflector). The<br>
>> cables<br>
>> have 3 conductors, we're using a fairly light gauge stranded wire,<br>
>> probably about like what's in ethernet cable. The connectors are 1/4"<br>
>> stereo headphone jack style (3 connectors). The cables may be up to<br>
>> about 250 feet in length.<br>
>><br>
>> Occasionally someone will get off course and run over one of the<br>
>> cables<br>
>> with their car, and they get some rough treatment at times, may get<br>
>> kinked, and get dragged around parking lots. I'd like to have some<br>
>> kind<br>
>> of way to do a quick cable test on them during setup to help shorten<br>
>> the<br>
>> troubleshooting time, so we'd know whether or not it's a cable<br>
>> issue, or<br>
>> another issue with the photo sensor.<br>
>><br>
>> Anyone have an idea of a simple device we could build to test the<br>
>> cables, or would we be better off using a multi-meter, or another<br>
>> pre-existing device?<br>
>><br>
>> -dc<br>
>><br>
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><br>
> --<br>
> Bryan "ka-klick" Baker<br>
> Singer/Songwriter<br>
> <a href="mailto:ka-klick@ka-klick.com">ka-klick@ka-klick.com</a><br>
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--<br>
Bryan "ka-klick" Baker<br>
Singer/Songwriter<br>
<a href="mailto:ka-klick@ka-klick.com">ka-klick@ka-klick.com</a><br>
<a href="http://ka-klick.com" target="_blank">http://ka-klick.com</a><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>=====================================<br>Lathrop Preston<br><br>