Cruiser133 Posted January 11, 2021 Share Posted January 11, 2021 Guys, I hope I can pick some brains here on this knowledgeable forum! I installed a uav on my 7800 and eliminated the rf parts. The issue I have is a band of color bleeding that no matter how much I adjust the pot, it won't go away. Any advice? Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 11, 2021 Author Share Posted January 11, 2021 Another picture of the band of color on the left side of screen Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 13, 2021 Author Share Posted January 13, 2021 I have a feeling this was a noob question that I should use the search function to answer. Can anybody at least point me in the right direction? Is this what is referred to as phase distortion? Quote Link to comment Share on other sites More sharing options...
John Stamos Mullet Posted January 13, 2021 Share Posted January 13, 2021 Is your 7800 connected to the TV using S-video, or Composite? Also - I assume you're using a video switchbox, given the number of consoles you have there. Try eliminating the switcher, and go direct to the TV, see if you still have the issue. I had an old Radio shack switcher that caused a similar issue, only with my 7800 Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted January 13, 2021 Share Posted January 13, 2021 Yeah, that looks like a cabling issue, or some other kind of RF interference; even if you have a composite or S-video modded system, most RCA and S-video cables are *not* truly-shielded coaxial cables; as a result, nearby sources of RF or strong magnetic fields can induce interference. Also, by any chance, has your console been modded to use a switching power supply, or are the cables in this photo near a switching PSU that is operating? Those things - especially cheaper ones - are RF noisy as hell and can make a real mess of a video signal in an unshielded cable. Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 13, 2021 Author Share Posted January 13, 2021 (edited) Thanks for the replies guys. I am using S video from the uav to a switch box. I have an atari 2600, neo geo and 5200 all hooked to the same box using the same manufacturers cables and only get the artifacts on the 7800. I even eliminated the switch box and it does it direct to the TV. What company s video do you guys recommend? Edited January 13, 2021 by Cruiser133 Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 13, 2021 Share Posted January 13, 2021 Must be my old man eyes, but I'm not seeing exactly what is being talked about? Quote Link to comment Share on other sites More sharing options...
+MattelAquarius Posted January 13, 2021 Share Posted January 13, 2021 1 minute ago, -^CrossBow^- said: Must be my old man eyes, but I'm not seeing exactly what is being talked about? I didn't see it at first either. There's a vertical bar of faint pink directly below the first set of zeros on the left hand side of the screen. Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 13, 2021 Author Share Posted January 13, 2021 (edited) 4 minutes ago, -^CrossBow^- said: Must be my old man eyes, but I'm not seeing exactly what is being talked about? Correct, faint band of color on left side. I followed your tutorial to the letter, even the pokey and sound mod. Thanks!! Edited January 13, 2021 by Cruiser133 Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 13, 2021 Share Posted January 13, 2021 I think I see it but then that also appears to be part of a reflection from whatever else is in the room. This would be easier to see with the ISO turned down with a dark room because I'm still not sure if I'm seeing it? Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 13, 2021 Share Posted January 13, 2021 Are you talking about the color bleed on the extreme edge of the right side? That is actually pretty normal on a 7800 with a UAV. Mine has it as well and it is mainly from hues of blue and purple on dark backgrounds. It was MUCH worse with the LHE as it did it throughout the entire picture and not just the far edges. If it is something else, then I'm not seeing it? Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 13, 2021 Author Share Posted January 13, 2021 1 hour ago, DrVenkman said: Yeah, that looks like a cabling issue, or some other kind of RF interference; even if you have a composite or S-video modded system, most RCA and S-video cables are *not* truly-shielded coaxial cables; as a result, nearby sources of RF or strong magnetic fields can induce interference. Also, by any chance, has your console been modded to use a switching power supply, or are the cables in this photo near a switching PSU that is operating? Those things - especially cheaper ones - are RF noisy as hell and can make a real mess of a video signal in an unshielded cable. I am using the factory power cable connected to a typical power strip. Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 13, 2021 Author Share Posted January 13, 2021 3 minutes ago, -^CrossBow^- said: I think I see it but then that also appears to be part of a reflection from whatever else is in the room. This would be easier to see with the ISO turned down with a dark room because I'm still not sure if I'm seeing it? It is on the left side and runs vertical under the far left zero. Smudging line of pink. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted January 13, 2021 Share Posted January 13, 2021 2 minutes ago, Cruiser133 said: I am using the factory power cable connected to a typical power strip. What kind of video connection are you using? Composite or S-video? Are you going through a video switcher? Is something else plugged into the power strip with the 7800 that might be producing electrical interference of any kind? Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 13, 2021 Author Share Posted January 13, 2021 (edited) 2 minutes ago, DrVenkman said: What kind of video connection are you using? Composite or S-video? Are you going through a video switcher? Is something else plugged into the power strip with the 7800 that might be producing electrical interference of any kind? S video, I am going through a box but it does it even direct to tv. Other systems are plugged into strip, but I can try plugging the 7800 alone into an outlet if u think that would help. Edited January 13, 2021 by Cruiser133 Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 13, 2021 Share Posted January 13, 2021 Nope..I don't see this pink smudge? And part of the issue is that you said the left side, then you said the right side and now left again? Are we talking about 1 or 2 issues here? Quote Link to comment Share on other sites More sharing options...
John Stamos Mullet Posted January 14, 2021 Share Posted January 14, 2021 zooming in on the mod picture - it looks like the two ground pins on the S-video jack are soldered together just before the pins? When I recently added S-video to my UAV modded 7800, I made sure to keep the who ground pins soldered to separate wires, connected to two different points of the ground bar on the 7800 mainboard, and NOT connected to the ground hole on the UAV itself, and that seemed to cut down on interference and color bleeding. Also - make sure not to connect it to the ground terminal of the audio or composite outputs (if connected) Quote Link to comment Share on other sites More sharing options...
+Mitch Posted January 14, 2021 Share Posted January 14, 2021 9 minutes ago, -^CrossBow^- said: Nope..I don't see this pink smudge? And part of the issue is that you said the left side, then you said the right side and now left again? Are we talking about 1 or 2 issues here? He is talking about the pink verical discoloration an inch or two from the left side. Mitch Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 14, 2021 Share Posted January 14, 2021 1 minute ago, John Stamos Mullet said: zooming in on the mod picture - it looks like the two ground pins on the S-video jack are soldered together just before the pins? When I recently added S-video to my UAV modded 7800, I made sure to keep the who ground pins soldered to separate wires, connected to two different points of the ground bar on the mainboard, and NOT connected to the ground hole on the 7800 itself, and that seemed to cut down on interference and color bleeding. I always solder a single wire to both of the grounds off the chroma and Luma on the s-video installs I do. However, I don't use the same ground that I use on audio and composite. But I do use the ground next to the chroma luma points off the UAV on the right side of the outputs, and use the ground on the left side of the UAV for the audio and composite. Haven't seen any issues doing that. Unless you are talking about something different? Even on my commercial grade Extron AV switcher, most of the grounds are tied together internally. Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 14, 2021 Share Posted January 14, 2021 1 minute ago, Mitch said: He is talking about the pink verical discoloration an inch or two from the left side. Mitch Yeah, I get that is what is being described. I'm just stating I don't see it specifically. I'm guessing my computer monitor isn't showing it to me? Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 14, 2021 Author Share Posted January 14, 2021 I will move around my ground wires and let you guys know. Do my colors look OK? Is the ground supposed to be brown on choplifter? Quote Link to comment Share on other sites More sharing options...
Trebor Posted January 14, 2021 Share Posted January 14, 2021 1 hour ago, Cruiser133 said: Do my colors look OK? Is the ground supposed to be brown on choplifter? The ground in Choplifter is specifically, Hue $E8. The entire Hue $Ex range tends to start green, but becomes yellow-brown as the system warms up. If interested, more details and specifics regarding the console's palette and colors can be read at the 7800.8bitdev.org site's Atari 7800 Color Documentation page. Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 14, 2021 Author Share Posted January 14, 2021 5 hours ago, Trebor said: The ground in Choplifter is specifically, Hue $E8. The entire Hue $Ex range tends to start green, but becomes yellow-brown as the system warms up. If interested, more details and specifics regarding the console's palette and colors can be read at the 7800.8bitdev.org site's Atari 7800 Color Documentation page. Excellent, thank you! 1 Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 14, 2021 Author Share Posted January 14, 2021 I tried fiddling with the color knob a bit on arrived here. Note the green smear on the bottom left hand of screen. Quote Link to comment Share on other sites More sharing options...
Cruiser133 Posted January 15, 2021 Author Share Posted January 15, 2021 (edited) 2 hours ago, Cruiser133 said: I tried fiddling with the color knob a bit on arrived here. Note the green smear on the bottom left hand of screen. I just bought a shielded s video cable made by monster that I hope does the trick. I really have no other ideas at this point. Could the uav board be bad? Edited January 15, 2021 by Cruiser133 Quote Link to comment Share on other sites More sharing options...
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