Re: Any DIY balun info for S-video to Cat5 conversion?

On Fri, 02 Sep 2005 00:22:45 +0200, martin griffith
<martingriffith@xxxxxxxxxxxxx> wrote:

>On Thu, 01 Sep 2005 22:10:33 GMT, in sci.electronics.design
>info_at_cabling-design_dot_com@xxxxxxx (Dmitri(Cabling-Design.com))
>wrote:
>
>>Dave wrote:
>>
>>
>>> I'd like to see if it would be acceptable picture quality wise to run
>>> s-video from a podium over ~125 ft of Cat5E back to a video switcher
>>> that feeds a multimedia projector. I've Googled and only found
>>> commercial units that cost ~$70/pair.
>>
>>> Can anyone point me to a website that shows how to construct these
>>> converters? (would 100bt transformers do the job?)
>>
>>> I could run a pair of RG6 over this distance and put S-video on that
>>> but I'd rather just pull 1 cat5e length instead.
>>
>>> TIA,
>>> Dave
>>
>>Dave, you are making it unnecessarily difficult. I don't know about your
>>budget and what part of the globe you're at, but $70 normally would not
>>even cover any labor costs associated with installing 125' of CAT5E cable
>>(depending on the environment, of course). On top of that you have your
>>time to develop a balun (design, find parts, build two of them). You may
>>very well be doing yourself a huge favor by spending only $70 on a pair of
>>factory-made quality checked devices that will also likely withstand much
>>more abuse than a bench-assembled prototype you'd build.
>Yep, at least a week on the workbench + test equipment, thats just to
>do a basic test. then PCB design, stripboard is not to good at video
>frequencies.
>
>Check out Kramer, bottom feeders of the food chain, in this sort of
>market.
>
>Might be woth just hiring the kit
>
>or even running coax!
>
>martin

All true; but this IS "sci.electronics.design", not
"sci.electronics.buy", so it's a valid question.

And, having purchased bottom-end "video" baluns, I can attest to the
utterly poor performance of at least the ones I tried (which, amongst
other things, had very poor LF response, and tended to wash out the
RHS of the screen, even with premium DC restoration performance in the
receiving equipment).

Many have suggested active buffers in the past for this function, with
good reason - it is hard to design passively-terminated magnetics to
cover so many decades of bandwidth.

Tony (remove the "_" to reply by email)
.

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