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Gammaxx issues

 
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jbltecnicspro



Joined: 23 Apr 2016
Posts: 489



PostLink    Posted: Tue Mar 05, 2019 9:37 pm    Post subject: Gammaxx issues Reply with quote


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Good afternoon all,

I got a gammaxx in hopes of boosting my CRT monitor's gamma. Kind of a "have your cake and eat it too" thing. Anyways - it appears to work, but it works too well. No matter what setting I use, the image is just washed out. Here's my signal path:

Nvidia GTX-770 > DVI-to-VGA cable (Nvidia is DVI-I for analog) > Gammaxx > CRT monitor.

The gammaxx is plugged into the usb port of my computer. It didn't come with a power supply, but I'm thinking that a USB power supply should be enough should I need to use one?

Anyways - any help here would go a long way. Thanks!
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 25340
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Thu Mar 07, 2019 1:00 am    Post subject: Reply with quote

Are you sure you have the GammaX the right way around?
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jbltecnicspro



Joined: 23 Apr 2016
Posts: 489



PostLink    Posted: Thu Mar 07, 2019 2:24 am    Post subject: Reply with quote

AnalogRocks wrote:
Are you sure you have the GammaX the right way around?


I didn't even think of that. I put the video cable from my video card into the "input" end of it. For the heck of it maybe I can try it the other way around...
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kal
Forum Administrator


Joined: 06 Mar 2006
Posts: 15644
Location: Ottawa, Canada

TV/Projector: JVC DLA-RS56


PostLink    Posted: Thu Mar 07, 2019 2:39 am    Post subject: Reply with quote

Input: RGBHV HD-15 D-Sub (VGA) Female Connector
Output: RGBHV HD-15 D-Sub (VGA) Male Connector

It was a common issue (that I think Jeremy answered questions on a thousand times) so we started putting stickers on them to indicate which end was which.

Only one X in GammaX too. Wink

Kal

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AnalogRocks
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Joined: 08 Mar 2006
Posts: 25340
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Thu Mar 07, 2019 3:39 am    Post subject: Reply with quote

jbltecnicspro wrote:
AnalogRocks wrote:
Are you sure you have the GammaX the right way around?


I didn't even think of that. I put the video cable from my video card into the "input" end of it. For the heck of it maybe I can try it the other way around...


It was designed to have the Male end as the output to plug directly into the back of a monitor. Also try with and without the power connected. Just to see what it does.

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jbltecnicspro



Joined: 23 Apr 2016
Posts: 489



PostLink    Posted: Thu Mar 07, 2019 7:32 pm    Post subject: Reply with quote

Well it still looks a little washed out, but it's looking a little better. I'm running no power. I can try power to see what happens, but I'd need to rig up a usb power adapter.
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jbltecnicspro



Joined: 23 Apr 2016
Posts: 489



PostLink    Posted: Mon Apr 01, 2019 10:11 pm    Post subject: Reply with quote

Okay, running power to it makes no difference. Essentially what happens is this:

1. Overall white level takes a significant hit. Peak white goes from 85cd/m2 to 75 cd/m2 with the same Contrast setting on my monitor (Sony GDM-C520K)
2. Gamma level is too low (high?). At best I can only get it to go up to 1.9. I would obviously prefer 2.2.
3. Image flickers.

I'm wondering if my GammaX is not making good connection with the monitor input?
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 25340
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Tue Apr 02, 2019 4:12 am    Post subject: Reply with quote

jbltecnicspro wrote:
Okay, running power to it makes no difference. Essentially what happens is this:

1. Overall white level takes a significant hit. Peak white goes from 85cd/m2 to 75 cd/m2 with the same Contrast setting on my monitor (Sony GDM-C520K)
2. Gamma level is too low (high?). At best I can only get it to go up to 1.9. I would obviously prefer 2.2.
3. Image flickers.

I'm wondering if my GammaX is not making good connection with the monitor input?


Too bad I lost track of my gammaX, I could do a test. I have 5 of those awesome monitors.

Sounds like you have a bum GammaX. Does the picture look OK with the GammaX out of the circuit?

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jbltecnicspro



Joined: 23 Apr 2016
Posts: 489



PostLink    Posted: Wed Apr 03, 2019 12:31 am    Post subject: Reply with quote

Yeah, picture looks a-okay without the gamma x. Sad Sounds like I have a bum one indeed. I bought it from eBay as a "new" unit. Should I just message the seller and just tell him that it's not working out? Pretty sure I threw the packaging out.
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