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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Tue Jan 29, 2013 5:26 pm Post subject: |
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According to wikipedia it says that normally you can go from a DVI-I source to an HDMI monitor but you can not always go from an HDMI source to a DVI-I monitor. In my application, I will want a DVI-I from a geforce 6600 and also a DVI-I from a radeon 9600pro to go into my JVC. Most of the DVI-I to HDMI converters I see on ebay are so cheap I think I will just take a chance to see what happens. According to wikipedia , there is no electronics involved the DVI-I converter only crosses the digital pins where they need to go. I'm just hoping a HDMI input on a JVC projector acts like what a normal monitor will do. I quess I'll only lose 3-4 dollars if I'm wrong and if it works, I'll let everyone know here. I'll probably buy a 20' vga cable too just for insurance. Videograbber can you recommend anything that you know works good?
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Tue Jan 29, 2013 5:34 pm Post subject: |
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As an aside, I have already encountered something else that isn't working with my new JVC. 1080p works fine coming from my 9600pro but still will not come up with the geforce. All I can get the JVC to sync up with is lower gforce resolutions. Yet I was running gforce 1080p fine with my Barco so I know the card is working good. I'm hoping the conversion to digital from vga might take care of this problem too.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Jan 29, 2013 5:44 pm Post subject: |
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Oh, and is HTPC your only source? What sources on the HTPC are you using?
SC
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VideoGrabber
Joined: 09 Apr 2006
Posts: 933
Location: Michigan
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| Posted: Tue Jan 29, 2013 8:41 pm Post subject: |
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| RVonse wrote: | | I'll probably buy a 20' vga cable too just for insurance. Videograbber can you recommend anything that you know works good? |
Did you already give the ferrite cores a try? You can probably find a pair for 3 bucks or so. (Though I see at RatShak they're 3 or 6 bucks, each.  )
As for quality VGA cables, it's probably been 8+ years since I last bought any. I suspect you could find good triple-shielded cables (each coax line) on Monoprice, pretty affordably. Avoid ultra-thin AWGs.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Jan 29, 2013 9:27 pm Post subject: |
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Tim, I don't see how chokes are going to fix RV's problem. HF reflections (or ringing) is usually an impedance problem caused by a cable or termination that's just not good enough to be used with high-frequency signals (or one that's damaged).
Chokes or not, why would anybody send an analog to a digital projector, anyway? It's never going to be as sharp as it could be, because you're doing a D/A conversion in the card, then an A/D conversion in the projector. Even with good D/A and A/D, you could still have pixel phase/shift issues, ringing, smear, and HF rolloff.
RV. This isn't an office LCD projector showing PowerPoint presentations. You bought an expensive projector to get the best image quality you could. Just buy the monoprice DVI-HDMI cable and hook the projector up the way it was designed.
SC
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Wed Jan 30, 2013 12:56 am Post subject: |
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| ecrabb wrote: |
RV. This isn't an office LCD projector showing PowerPoint presentations. You bought an expensive projector to get the best image quality you could. Just buy the monoprice DVI-HDMI cable and hook the projector up the way it was designed.
SC |
Totally agree with you here, when in Rome do what the Romans do.
But there is one other thing to consider. I only have 2 HDMI ports on the projector but I have 4 inputs to feed into it. It probably would make the most sense to share one of the HDMI ports with the 2 computers and share the other HDMI with the 2 players though. I think I'd rather have quality of the digital signal than the convenience of 4 separate inputs to the projector.
I'm sort of going crazy right now waiting for my long HDMI cables. The blu ray hooked up to the JVC just beats the crap out of the vga inputs from the computers but no sound because it is too far from my av reciever.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Wed Jan 30, 2013 1:02 am Post subject: |
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| ecrabb wrote: | Oh, and is HTPC your only source? What sources on the HTPC are you using?
SC |
I have 2 htpc's, both on internet and capable of OTA broadcasting and playing movies either from hard drives, dvd players, or VCR input. I also have 2 players both with HDMI outputs. One is blu ray and the other is an older hd dvd player.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Audiophile
Joined: 23 Jun 2012
Posts: 29
Location: Manassas, VA
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| Posted: Thu Jan 31, 2013 3:21 am Post subject: |
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Congrats Kal, thanks for the interior shots of the JVC. Coming from a CRT projector owner of many years, I can say the JVCs with their convergence settings and settings to tweak really are the CRT enthusiasts digital projector.
OT, did you write the Wikipedia page for CRT projectors? I notice the pics are similar 
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JVC RS40U Screening Room
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Thu Jan 31, 2013 4:33 am Post subject: |
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Judging by all the links and the Barco references, it looks like Eisenmann probably created the page.
Kal... Looks like your boy was about 3 or so in that photo... How old is the little guy these days?
SC
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Thu Jan 31, 2013 2:07 pm Post subject: |
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Link: http://en.wikipedia.org/wiki/CRT_projector
| ecrabb wrote: | | Judging by all the links and the Barco references, it looks like Eisenmann probably created the page. |
I remember the page existing but then Greg kept adding in links to his website and they kept getting removed by others since they were not relevant and basically just advertising his site. The comment "CRT Projector and Mod Specialist" beside the external link to his website is a good example of the sort of things that Wikipedia frowns upon. That's blatant advertising. Obviously nobody reads the page anymore as it's still up.
You can tell that Greg didn't create it because the information is (generally speaking) well formatted and organized. 
Look at the first link to his site. It's the first entry in the "references" section but it's not actually a reference (there's no number). He simply cut & pasted a link into the "references" section. That doesn't belong as it's not a reference from the text. If you go to the link it's a page on his site that lists his OWN references. That's not what the references section is for. The references section is to provide additional backing to individual items presented in the text (that's what the little numbers are for).
| Quote: | | Kal... Looks like your boy was about 3 or so in that photo... How old is the little guy these days? |
I think he was somewhere between 2-3 in the photo. He just turned 9. Wow. Where does the time go?
Kal
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Thu Jan 31, 2013 2:20 pm Post subject: |
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It's interesting to look at how the page has changed over the years. It seems to have been originally created in 2005 by some unknown user on IP 217.169.133.249 which is in Switzerland.
If you click on the "VIEW HISTORY" tab you can track every change and who did it. The following text:
| Code: | | *Long service life, CRT tubes maintain good brightness to 10,000 hours.<ref>{{cite web|url=http://www.curtpalme.com/CRTPrimer_4.shtm|title=Curt Palme CRT primer|work=Curt Palme.com}}</ref> |
Was changed to:
| Code: | | *Long service life; CRT tubes maintain good brightness to 10,000 hours.<ref>[www.eisemann-theater.com]</ref> |
This was done on 23 June 2010 anonymously by IP 216.185.14.20 (Maryland USA - same area where Greg is from).
If you go to the link to Curt's site that is provided as the reference, it does ineed state that CRT projectors maintain good brightness for 10,000 hours. The new link does not. The original text was added by user "Megapixie" on 15 January 2008. Not sure who that is.
Further down you can see that the following text:
| Code: | *[http://www.curtpalme.com/CRTPrimer.htm CRT Projector Primer/FAQ] Find out why CRT Projectors are still used in home theaters where image quality is paramount.
*[http://www.curtpalme.com/TechTips.htm CRT Projector Manuals & Setup tips] Hundreds of manuals and pictures showing board level controls and adjustments for the most popular projector models including Barco, NEC, Electrohome, Sony, Ampro, Zenith, etc.
*[http://www.curtpalme.com/forum CRT Projector Discussion Forum] A forum to ask CRT projector questions from other enthusiasts and technicians. |
Was replaced by:
| Code: | | * http://www.eisemann-theater.com/index.php?option=displaypage&Itemid=73&op=page] CRT Projector and Mod Specialist. |
This was done on 24 May 2010 anonymously by IP 173.79.65.48 (Mayland, USA - same area where Greg is from).
EDIT: Looking through the history I see that I added the 3 links to Curt's site I mentioned above in 2006 as well as the photo. I'm user KalW.
Kal
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Sat Feb 02, 2013 3:38 am Post subject: |
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| kal wrote: | Get a $20 HDMI switcher. Simpler than a couple of long HDMI cables (and you'd need a switcher anyway with 4 sources).
Kal |
Got one on order now, thanks for your comment Kal. My hdmi cables came in today and its great to have both sound and picture coming from my blu ray again.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Sat Feb 02, 2013 3:43 am Post subject: |
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| Audiophile wrote: | | Congrats Kal, thanks for the interior shots of the JVC. |
You don't know just how much I am praying not to see the interior shot of my new JVC.  I'm ready for a projector thats not going to require a lot of service and I hope this thing delivers.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Sun Feb 03, 2013 1:15 am Post subject: |
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After some time under my belt watching some blu rays now, I have to say that this JVC impresses me more all the time. Definately exceeds the performance of my old 9" crt, I could never get this kind of raw horsepower gamma wise. It is as though I am watching stacked 9"ers in perfect focus. From my seat I see no screendoor whatsoever.
I can only think of one thing my old Barco did better; it started faster. I'm going to miss sitting down, firing up and watching right away. This JVC takes a long while frettering and fooling around before it finally gets ready to play.
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VideoGrabber
Joined: 09 Apr 2006
Posts: 933
Location: Michigan
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| Posted: Sun Feb 03, 2013 5:00 am Post subject: |
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| RVonse wrote: | | This JVC takes a long while frettering and fooling around before it finally gets ready to play. |
What does this mean, exactly? What the heck is there for it to do? (unless you just selected a different memory) And what is "a long while"?
Have you been able to detect the lower motion resolution of the LCoS? (an occasional criticism)
| Quote: | | ...one thing my old Barco did better; it started faster. I'm going to miss sitting down, firing up and watching right away. |
No warm up time at all, even for convergence & geometry to lock in? My 808 was pretty well-balanced, yet I always gave it 5 minutes or so when starting up from cold.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Sun Feb 03, 2013 4:50 pm Post subject: |
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I think he means the startup time. My RS56 projects no image (black) for approximately the first minute or two after you turn it on before it displays the source signal. I'm assuming it's time required to allow the bulb to warms up and stabilize (?).
You don't need to do anything during this time. I'm usually staring at the DVD/Blu-ray shelves during this time trying to figure out what to watch. Or getting a beer. Or both.
My Barco did start projecting an image immediately upon turn-on but still took a good 5-10 minutes to lock in convergence. (That's considered pretty fast - my previous Barco 800 took a 30 minutes even after I re-capped the entire. The re-capping simply make the convergence stable once it was done warming up - prior to recapping it would take 30 mins to stop drifting but would always end up at slightly different places).
Overall the RS56 gives me a stable picture considerably faster.
Kal
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VideoGrabber
Joined: 09 Apr 2006
Posts: 933
Location: Michigan
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| Posted: Sun Feb 03, 2013 7:17 pm Post subject: |
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| kal wrote: | | I think he means the startup time. My RS56 projects no image (black) for approximately the first minute or two after you turn it on before it displays the source signal. I'm assuming it's time required to allow the bulb to warms up and stabilize (?). |
Thanks, Kal. That makes sense. I wouldn't call 2 minutes a "long while" for warm up, though I can see if Bob was used to things lighting up immediately, that could seem like nothing was happening for a long time. But then you're immediately good to go.
| Quote: | | My Barco did start projecting an image immediately upon turn-on but still took a good 5-10 minutes to lock in convergence. |
Same here.
| Quote: | | (That's considered pretty fast - my previous Barco 800 took a 30 minutes even after I re-capped the entire. The re-capping simply make the convergence stable once it was done warming up - prior to recapping it would take 30 mins to stop drifting but would always end up at slightly different places). |
Yes, I remember that. And waiting 15-20 minutes is not unusual for most analog PJ owners. That's just a price we paid. Getting it down to less than that meant you had both solid components AND a well-balanced mechanical setup, with minimal electrical offsets to compensate. Mine actually took closer to 10 min to lock in for test patterns, but I only gave it a 5 minute warmup before starting to watching movies.
| Quote: | | Overall the RS56 gives me a stable picture considerably faster. |
No doubt! Though there was one way I could get a stable picture instantly on my Barco, with the proper source material...
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