GPS dropouts caused by xenarc?

fishy · 12-30-2004, 06:13 PM

Hi all,

I have searched and searched, but cannot find the exact answer to my dilema, so if someone can point me in the right direction, i would really appreciate it -

I have a DWW gain/xenarc screen, and have noticed that when my BU303 GPS module is near the screen, it causes dropouts (i can test this theory, because when i run the GPS mobule on the laptop without a gain xenarc it works fine sitting on the dash of my car, when i hookup the xenarc, it will drop out intermittantly, and when it does dropout, if i turn off the xenarc, it the GPS will get its signal back instantly).

any ideas on how i can shield my GPS module from the xenarc's screen interferance? also - i read a thread about lilliputs doing this, is it common for a xenarc to do the same? (i cant find the original threads, sorry)

much oblidged to all who can help.

fantomas · 12-30-2004, 06:26 PM

how about moving the receiver away from the screen..?

fishy · 12-30-2004, 06:30 PM

tried too, as much as i can, i am limited to where i can put the GPS mobule, it needs to see the sky blah blah blah, i have no rear parcel shelf, so its got too be on the dash somewhere, but because the xenarc is right in the middle of the dash, it effects the entire dash area...

fantomas · 12-30-2004, 06:38 PM

how are you powering the xenarc?

fishy · 12-30-2004, 06:38 PM

12v phiong regulated power supply, which lives in the rear of the vehicle. reason being is that the digitalWW indash version does not come with a power supply of its own.

DaRacerz · 12-30-2004, 10:27 PM

Well, I personally haven't noticed a drop out near the Xenarc screen, but then again, the closest I ever had my receiver was about 1.5 Feet with an Earthmate. Being your setup is like that, you may wanna look into getting a Roof mountable Receiver or Antenna. This will give you the best possible scenario for satelite coverage.

DaRacerz · 12-30-2004, 10:34 PM

Forgot to add that you can possibly shield any Xenarc interference by using a STEEL plate between the Xenarc and the GPS receiver. But remember, this plate can also block the GPS signal if you block the line of sight with this plate.

actsci · 01-24-2005, 11:10 PM

I'm pretty new to this whole thing, but I thought I'd mention that I have the same problem with my setup as well, though I am using a Lilliput. It can be totally isolated to the monitor and I've tried relocating the GPS <pharos 360> as far away as possible, including the other end of the car. The only success I found was removing it from the inside of the car and holding it on top of the roof. This test was done several ways, including nothing at all attached to the lilliput, but simply powered on while running the GPS from the tablet pc, not otherwise connected to anything. Any info on this would be a good thing.

strohmrs · 01-25-2005, 01:07 AM

This happened once to me with my lilliput. I have my GPS mounted to the top of the dash so that I can still use it with out the computer and have my LCD screen mounted to the front of the dash. I repositioned the location of the screen a bit and haven't had a problem with it since. It is still only at most a foot apart from each other. I think it has something to do with the high voltage inverter for the CCFL backlighting causing interference with the GPS. All I can suggest is to just find a spot where your GPS works and keep the cables for each separate.

Bugbyte · 01-25-2005, 01:18 AM

Zowie!! So THAT'S what's wrong with my GPS?!

I recently installed a Xenarc to replace my old screen. The GPS is about a foot away from the screen, on the dash. Ever since I got the new system up and running, the GPS reception has been spotty. It drops satellites, loses it's lock and then regains it but always seems to struggle to keep track. I couldn't figure out what the hell was wrong with it.

This also explains why it worked perfectly on the back shelf of the car when I tested it with a laptop in the front seat and then it worked like ***** when I installed the computer directly underneath it. Never did figure that one out...until NOW.

I'll say it for everyone: I'm a moron. Thanks for solving the problem for me, guys!

actsci · 01-25-2005, 11:40 PM

It sounds crazy, but I saw this posted in another thread, and it worked for me and my lilliput problem. If you have the refresh rate set too high <75+>, try lowering it to 60khz. This fixed my problem entirely. I can now have the GPS receiver practically on top of the Lilli without a problem. Hope it works for ya.

tjd

Bugbyte · 01-26-2005, 12:44 AM

Thanks, I'll try it although setting the Xenarc to less than 75hz causes the 800X600 to display improperly on the Epia-10000. I may have to fall back to 640X480 and try it.

fishy · 01-26-2005, 06:58 AM

being a tech myself (not a car tech tho, lol) i tried this idea, but i noticed little or no difference in changing the refresh rates. dropping refresh to 60hz just made the screen a little less "sharp" looking, and not a whole lot else. The digitalww7vga model i have is defaulted to 60hz, so up the line i went, up to 72hz, cause 75hz wigs out the crappy vid card the laptop i was using has installed. now that i have a true PC (cause i have space in the rear of my car, and HATE slow comps, and cant afford a new lappy) i will re-try, but i doubt its going to help. Lucky for me, i have a sunroof, SO, when the weather is good, i stick the bu303 on the roof, when the weather is bad, it comes back in the car, much to my groans and moans, even tho i have waterproofed it, i just dont like it being out there, although i have left it on the roof during a storm a couple of times, and its worked just fine (after waterproofing, different story tho, sorry for my waffle).

anyways, it didnt help on carpc version 1, i will try with version 2...

danilom · 02-08-2005, 09:34 PM

I had the same thing with my bu-303 and lilliput. You need to change the clock on the screen itself. Mine is like a total jammer when screen clock is around defult 50-52. It's also at it's sharpest. I have a full PC and board with NForce chip. The drivers have a option for auto tune and auto gain for LCD's where they display this pattern and you run auto's on the screen. Well that's where they were put and that's where they create GPS blackout zone inside my car. Outside(roof) will work, because the car is a shielde. Put it outside the window but still in sight of the screen and it will not work. But when i move the clock just past 55 i get 4 sats, past 57, i get 5 locks. My PC refresh rate is 85Hz, found to have least interference in the screen that way. Now i know why. It jams everything else around it. By using phase setting, i think the clock can be compensated, just a little part of the screen will be "off-screen", but hey it works.

saintx · 01-03-2007, 10:19 PM

bump!

has anybody else seen a better solution? perhaps a way to shield the GPS antenna and USB wire?

User Name		Remember Me?
Password