RGBHV over shielded Cat 5 success! - Page 6

I finally made one of those cable. I am happy with the quality but the image is not perfect. To give you an example. If I look at the mouse pointer I could see that the pointer image is repeat 2 times. The repetition are really light and barely noticeable but they are there. How can I eliminate this? The cable I made is 50 feet. I don't need that long, 35 feet at worst. Will reducing the length solve that repeating problem? They were discussion of shorting the ground at the extremity. Will that help?

Thank you!

Bruno

I've just run the cable on saturday, need to pick up a few more hd-15 ends.
Anyone have a part no.? Good places to mail order?

Thank you Mr Wigggles!

Radio Shack as stores in Canada. For STP cable in Canada you can go to www.cablek.com

Radio Shack as 25 feet STP cable.

Bruno

It seems people are having trouble finding the shielded CAT-5. I called the local electrical supply house (you know, the place with all the electrical contractor vans out front.) They had 2,000 feet in stock. I don't recall the exact price, but it was pretty cheap. Worked great.

I had no trouble finding the cable (best computers in Edmonton) but The 'Shack I bought the HD-15's from is sold out, and the part #276-1501 doesn't register on RatShack's Canadian website!

Does anyone have a digi-key (or other) equivalant part #? the d-subs on digi-key are kinda hard to sort out...

Hi all,
I Know some of you are having trouble finding Cat 5 shielded cable. Alot of suppliers will not sell in "short" lengths. I have some spare I would split up into 25-50 foot sections, if anyone is interested...

Just made some of this up and I get a narrower picture width using my XVGA computer output @ 1024*768. I am using STP cable with a coupler inline but I noticed that the coupler does not carry the shielding through it, even though I ordered a shielded coupler, looks like I got this unshielded one! Is carrying the shield across the RJ45 connectors a must? I would think so because, like Mr.Wigggles said, wire pin 10 of the HD15 connector to shield ground of the cable. I did this as stated but without a totally shielded coupler carrying this ground through the RJ45s, problems may occur? My LT150 manual states pin 10 is 'sync ground'. Maybe having this ground broken at the coupler is causing my picture width to be distorted?

PS - This cable worked good using component video from my DVD player, which is obviously not using pin 10 on the connector.

Tony

Mr. Wigggles
I did some tests just now and found that when I take a very short wire (2") and jumper across the coupler to the RJ45 shields to complete the ground I totally eliminate the ghosting in the picture. I didn't mention this in the above post but it was there. I also manually went into the setup on the projector and changed the clock and phase controls back to the way they were with my old coax cable and voila, the width went back to what it should be. I guess when I leave the projector on Auto Adjust somehow the sync must be distorted and fools it into readjusting the clock and phase which it thinks is right, but this then squeezes the picture too thin. I'll try to order some shielded couplers tomorrow.

Tony

Does anyone have a source for solder-cup HD-15 connectors other than Radio Shack?
I built a 100' cable to test, everything worked so I ran the cable in the ceiling, cut to length, now I need another connector (the RatShack I bought the first 2 from is out).
Need an online source SOON!

EDIT-
I finally found a Radio Shack w/ the HD-15 connector, it turns out it's a discontinued item in Canada. For future reference, though, It would be nice if someone had a usable digi-key part #.

Can anybody tell me what cause ghosting? I build one of STP cat 5 cable. I seem to suffer severe ghosting. For example if I look at my mouse pointer I see it 3 to 4 times. Now what cause that. Bad soldering? Cable quality? Bad grounding?

What can I do to eliminate this? If it's my soldering any trick to give me?

Thank you!

Bruno

My cable is 50 feet for now. But it will be around 35 fleets when it will be permanent. The thing is I want to make sure it is going to work when I install it. I don't want to start my
electric husbox installation before I am confident with the cable. I don't want to cut the cable yet because I want the right length. The cable is not split. It is one piece of cat5
shielded. It got 5 twisted pair instead of 4. With my cable I was able to separate ground for H and V. I hook the shield wire plus the H sync ground to pin 10 and the V sync ground to pin 5.

Here is my connections
1 orange
2 green
3 blue
5 brown strip
6 orange strip
7 green strip
8 blue strip
10 black strip + shield wire
13 black
14 brown.

Thank you

I would try moving the wire on pin 5 (brown strip) to pin 10 (sync ground), and keep the two other wires there also.

Actually I don't think you need the sync ground wires at all. As long as pin 10 is connected to the shield of the cable at both ends it should work fine up to a certain length as has been said before (~30 ft.), then you might get ghosting above this length.

According to my info, pin 10 is sync ground for both horiziontal and vertical.

Tyee

Quite interesting. A quick search on Google turned up this HD-15 to RJ-45 adapter http://www.patton.com/subscriberline/article4.htm just drill down to the very bottom and you'll find it - for those with a soldering phobia.

How about if you take an RJ-45 block and mount an HD-15 socket into it (some minor cutting would be required), wire it up internally and then plug your VGA cable into it and your shielded cat5 into the other side.

Another way for those with a fear of soldering would be to take a VGA cable, cut it in half (one end for HTPC one end for PJ) and then using two RJ-45 blocks simply connect the cables inside hence making your own "dongle" adapter.

This way you would be able to use a pre-made shielded CAT5 cable if you don't have the crimp connectors and crimping tool to make your own.

I did what you said. The ghosting is less pronounce but better than it was. Could I also short the ground at each extremity. I think I read it somewhere but I am not sure if it's dangerous.

What I mean is linking all the strip wire (red ground, green ground, blue ground , h sync ground and v sync ground) together.

Bruno

Thank you for your respond. Shorting pin 5 and 10 together gave me better result and I am able to eliminate most of the ghosting with the sync settings on my projector. The image look better for film purposes, but you can see it's not perfect with text.

How can I find if it's 100 ohms? My cable is stranded instead of solid can that make a difference?

I bought it there http://www.cablek.com/new/cat_page/c...28UTP_STP.html

part number STP-5P-26B no mention of 100 ohms. The rating is 26AWG instead of 24AWG. Is the rating on the page a technical specification I should know about.

I also forgot to mention that my projector is a Viewsonic PJL830 (Davis DL450 clone) and need an EVC connection. I have a converter than change my DB15 plus to a EVC plug. I guess the converter could be a cause of ghosting. Can I find an EVC plug that can be solder? That will eliminate that problem. Thank you again for your help!

Bruno

I've read much of this thread . . . and have a question. Can decent B&W video (from chip cameras for CCTV) be transmitted over 100 ft of ordinary Cat 5 (or 5 enhanced) . . . unshielded?

My wire is already run, and (in most places) can't easily be rerun.

Here is the information on the HD-15 male ends from the Digi-key website:

Digi-Key Part Number: T815M-ND Quantity
Manufacturer Part Number: 180-015-102-001
Manufacturer: NorComp, Inc.

Description 15 PIN MALE HIGH DENSITY D-SUB

www.digikey.com

I have read through all the posts under this thread and made a 15 meter (around 50feet) cable with the UTP cat5 that I have plenty of (without connecting pin 10)

I hooked it up between my pc and monitor and there was no ringing or ghosting whatsoever.
Then I connected it on the pc in my office and I see ringing everywhere

Having played around with it for a week and I came up with a thought: maybe it was the graphics card that made the difference

I use a Geforce2 MX 32mb at home, no ringing at any resolution
Savage4 4mb in my office, 800*600 achieved the best result
For those of you who can not get rid of the ringing problem, please try running at different resulutions AND refresh rates

As a newbie here, I would like to share with you my experience of building a 15meter(50feet) S-video cable using UTP cat5's

--------------------Y ----------------C
---------------------*----------------*
------------------*----------------------*
---------------Y(-)------------------------C(-)

Buy any S-video connector you can find and solder:
1. blue solid and brown solid on Y, red solid and green solid on C
2. blue stripes and brown stripes on Y(-), red stripes and green stripes on C(-)

on the other end, make sure that you take one wire from each (-) and switch them (or you'll see ringing problems), so it becomes:
blue solid and brown solid on Y, red solid and green solid on C
blue stripes and red stripes on Y(-), green stripes and brown stripes on C(-)

I hope I'm not out of line here, but my company
stocks all the components you guys are talking
about. Cat 5E, Cat 6, HD15 M&F, RJ45-DB15 adapters,
etc. etc. We also manufacture Cable Assemblies
and patch cords and deal mainly with computer networking
firms. We could make the cables for you at a very reasonable
price.

Email me if you guys need cables, parts, etc.

Again - hope this isn't out of line!

Aceman

Aceman@aceelectronics.com

Is cat-7 available yet? I can't find any retailers. It's supposed to be rated up to 600MHz I believe.

There are several manufacturers of equipment specificly for converting signals (such as video) for transmission over CAT5. While more expensive than simply splicing a VGA head onto ethernet cable, they will ensure that timing, etc. is maintained correctly. You can effectively, with no loss in quality, run the cable around your house a few times.

You won't get the satisfaction of using a soldering gun, though! ;-)

I personally was skeptical but I just made may own cable with $10 worth of parts from Rat Shack and a 50ft segment of unshielded.

I do see an occasional ringing but it's not too bad.

Where does one look for shielded cable? Any known online retailers? I don't think it is available locally.

25' CAT5 STP is sold here for $2 ... http://stores.yahoo.com/lanadapters/

Other sources:

http://www.datacomlink.net/stp/
https://www.national-tech.com/catalog/cat5cables.htm
http://store.yahoo.com/1010net/100catshielp.html
http://cableclub.com/view_product.asp?item_no=20640


See my thread below for CAT5e STP stuff

http://www.avsforum.com/avs-vb/showt...hreadid=117824

Gireesh.