[Thumper]

DB,


Look at the dates on the posts in this thread. When this thread started these products simply were not available. Partially as a result of this thread the need was created and these products were eventually developed.


A testiment to the power of the AVS forum

Thumper

 

[occammd]

Thumper


I understand why you would tie the grounds together on either cable end, but why the shield? I would think you would leave this tied to shield of either both devices, or just one or the other, but not inherently shorted to ground.


Thanks,

Ray

 

[stephenfrancis]

At $25 each, it's not cheap. I think the whole point of this thread was to build a product with cat5 that was inexpensive. If you're paying $50 for connectors, and $20 bucks for cable, it might be more cost effective to just purchase a complete cable system. I built my 20ft cat5e VGA cable for ~$30. And it works great!


Steve

 

[Brandon B]

Try and pull your complete cable through 40 feet of conduit.

BB

 

[Thumper]

occammd,


The reasoning behind tying all the grounds & shield together is simple:


Not all video driver output boards and projector input boards are the same. They can and do have varying connecting trace paths, lengths & widths for each return conductor. In a few cases they don't even have all the ground paths for some of the circuits brought out to their connectors!


This method insures the lowest possible return resistance in just about all circumstances because it includes the board traces as a limiting factor. The shield then has the lowest resistance attainable between the source & load power supplies which is required to attain the near 75 ohm impedance needed.


Oh, and BTW I've heard of forum members obtaining these connectors for a lot less than $25 each.


Thumper

 

[halljb]

I'm interested if anyone has found a cheaper place to get these connectors. I've always found the AMP ones in packs of 10. Has anybody found a place that sells singles of them? If you've found single ones cheap(er), please post or PM me.


I've got a small ghost on my cable that I'd like to fix, but it's not a big enough problem to resolder things, and I don't want to shell out a lot for the pre-fab connectors. If I can fix it easily and cheaply, I'd be happy

Thanks

 

[blueking]

This may not be the right thread to post this. I am copying the posting I did in another thread here hoping to get a quicker help.


Making a component to VGA cable for Infocus X1.


I made two cables using broken computer monitor cable (as one end) and solder 3 RCA plugs on the other end. It works just fine. The second cable I made is much longer than the first, about 28'. The first one is about 6' (minimum RCA cables). There is not apparent differences, but I think the longer cable has a little worse result (as you can imagine). I measured the resistance of the two ends. For the shorter cable, each wire is about 1-1.5 Ohms. The longer cable has 6 to 10 Ohms (don't know why the three wires have so much differences). The ground is about 6 Ohms. I *feel like* with the longer cable, the picture is not as bright and sharp. So, I am considering making another cable using CAT 5 ethernet cable as discussed here. The RCA cables I used are just cheap audio cables I bought from Dollar Stores (very thin copper wires inside). Will the CAT 5 cable give better results? Will it has less resistance than the RCA cable? CAT 5 cable has 8 wires in it, so it can't be that thick either. BTW, my longer cable has about 5' monitor cable plus 23' RCA (3 RCA wires bundled together, unshielded). Will the shielded ethernet cable significantly improve the image? I will not bother to make another one if there will not be big differences (maybe I should not expect big differences because I don't experience big difference with short and long cables ). During playing the movie, I don't really see the degradation of image quality, but I think when the player displays its logo (when not playing), the image is not as bright or clear) and some colors are not accurate.


The question is improving which one is more important, resistance in the wire or the shielding? I spent $4 dollars making 2 component to VGA cables and still left me with a bunch of spare RCA plugs . That's really cheap!

 

[jenbond]

OK - simpleton here. I have very little space in my wall, so I need to make my VGA cable out of Cat-5. I am connecting my RCA DTC100 to my Panasonic L300U. Would rather not solder, but the Hubble product seems to offer just a female out, and I'll need the male version - would a simple converter do the trick? Also, never saw an answer to this:


***


Mr. Wiggles,


Could you please explain to a non-engineer (namely me) whether I can use this Amp product simply by plugging in a shielded cat5 cable? Or do I have to cut off the connector and do something with it (like solder or crimp or something)? I really want to try this out, but I don't have a soldering iron and couldn't use it if I did have one


***


Any help would be great! I need about a 25ft run, and this looks to be the way to go. Thanks!

 

[MrWigggles]

To use the AMP product you will need to strip the wires but no soldering is necessary.


-Mr. Wigggles

 

[R00st3r]

HI,


I have a question about using a VGA extension cable. i had one laying aroung and has VGA HD-15 connections on both ends (1 side M and the other F). If I remove the male HD-15 and and solder the male RCA connectors based on the original specs

1 & 6 to Y-R (Pr)

2 & 7 to Y

3 & 8 to Y-B (Pb)


wouldn't that work as well? Would the qualitiy of using the VGA Extension cable be better or worse.


The reason for asking is 1/2 the work is already done.... Thanks.

 

[Kriilin]

What a great idea! I just bought a 1000' box of shielded Cat5 to wire the house, and was wondering what I could do with the extra.

 

[oldfella]

Where do you buy the amp connectors? Even google is baffled.


Jim

 

[Jacek Karpala]

Great ideas...!

Can one splice the DVI and/or RGB cables without too much of the loss in signal parameters? (- tight space in conduit).


Thanks,


Jacek

 

[oldfella]

Now I'm begging. Where can I get these magic connectors?


Jim

 

[oldfella]

Is this L-com piece a reasonable alternative, albeit not as nice but significantly more available?

http://www.l-com.com/jump.jsp?lGen=p...ProductID=7166


Jim

 

[MrWigggles]

The AMP PDF is at:

http://www.ampnetconnect.com/docume...28100402%29.pdf


You could call them and ask if the product is in production.


-Mr. Wigggles

 

[fecund]

I ordered some cable to try this out:


"Thomas & Betts P/N 26-4-SC-5-PCH 4PR 26 AWG SCREENED TYPE CM/MP (UL) 75C LL702046 CSA TYPE CMH -

- ScTP CATEGORY PATCH [footage marking] 08/11/98"


35.00 / 1000' roll. The guy has a few more if anyone is interested.

 

[Edwood]

Anyone try this with a DVI->DVI connector?


Man, I was hoping to do a 100' run. Looks like the cheap solution will have too much ghosting.


-Ed

 

[kkramer25]

if i missed this in the thread please forgive me... i think it was asked but never answered. i have run into a snag.. i have an Infocus X1. i bought a BNC to VGA breakout cable from pccables.. problem is i cannot get it pulled through my wall because of the thickness. i have run 2 CAT5 cables, one UTP and not sure about the other, but it would be easy to rerun an STP. i was going to make a Component to VGA cable using CAT5 but since I have purchased the component to VGA adapter from Infocus can I just make a component cable using the CAT5 and some male RCAs? i can't find any wiring info on this or maybe it is not possible.... thanks. btw the run is about 30-35'

 

[Jeff J]

check out post 34 and 35:
http://www.avsforum.com/avs-vb/showt...139#post172139


basically you use the same rgb wiring configuration and just leave the sync wires off.


I think that later in the thread someone posted pictures of a cable using rca connectors - not sure if that was another thread or not.

(edit/find is a good way to scan thru large posts like this.)