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Post by davy on Dec 30, 2014 15:23:07 GMT
Back to this old chestnut again..few clearish nights for me..had to wait on moon clearing my fov started picking up stars ect in the 6mm on the flip..switched to camera. .bloomin phase lines on monitor. .this is with my decent power supply aaargh had it befire with piwer supply I got with the pd1.. going to battery power from my portable array and use one of its cameras..
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Post by Dragon Man on Dec 30, 2014 15:29:17 GMT
How did you fix it last time Davy? I can't remember.
Didn't you buy a better power supply?
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Post by davy on Dec 30, 2014 17:21:52 GMT
Yeah got the one recommend by the a/p on sgl..regulated 5amp enough to run my mount and camera's ..will dump the mains supply, camera, usb grabber, base station an use my portable array all run from a 22amp gell battery..got my guider in today it's got an 8mm x 8mm mirror..will try it hopefully tomorrow. .stuck the dslr on and a x2 barlow on the ed80 done a moon mosaic through a closed window..ni point in letting tge brass monkeys in lol...edited it in Microsoft I.c.e..tweaked in corel photoshop pleased with that at least.
sitting in a&e with carol again went to doctors and said hospital..the joys..going to pick my drum up 11.30 pm and playing round half the town at 00.15...knackered all ready. .heat in the hospital unbelievable.
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Post by johnno on Dec 31, 2014 1:28:24 GMT
Davy have you tried changing your video cable? I had lines on my Sammy, and when I bought the xtreme I used the cable that came with it and tried it on the Sammy and the lines vanished, might be poor shielded video cable
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Post by Dragon Man on Dec 31, 2014 15:38:17 GMT
Good point John.
Also, don't use the same power supply that you are running your mount with. That's not good.
Use a separate power supply for the camera. A 1 or 2 amp will do.
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Post by davy on Jan 3, 2015 21:34:13 GMT
ordered 4 5mtr coaxial bnc cables tonight..need some clear weather next week for testing..hoping to get down to the galloway forest dark site observitory before end of the month...going to try and get a night in the campsie hills this week.to do snagging..uncle john intrested in the star party down that way in february ,,geoff from dasoc had done a nice write up on there website...may be time to start hitting dark sites..davy
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Post by Rick in NWArk on Jan 9, 2015 16:16:47 GMT
You can also try to separate the lines with some distance and even run them perpendicular so the magnetic field lines wont generate the current in the copper.
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Post by davy on Jan 11, 2015 16:22:16 GMT
phase lines sorted out ..the new bnc ended coaxial cable solved the problem crystal clear now. i ordered four so will use the others on the portable array.
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Post by Rick in NWArk on Jan 12, 2015 4:51:59 GMT
Good deal, Davy.
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Post by davy on Jan 23, 2015 23:27:25 GMT
Quick update..camera array..done a comparison on the video signals, I had been using what is called a shotgun type cable , power and av combined I swapped the av cable with coaxial cable..big difference in quality and in my opinion the utc worked better as well.
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Post by Deleted on Jan 24, 2015 23:24:54 GMT
I dumped the shotgun cables long ago Davy. I just used them for power or signal, but not for both at the same time. I only use utc cat5 cable now. It can take power and signal to my meteor cams and provide a nice clear pic.
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Post by Rick in NWArk on Feb 5, 2015 22:34:01 GMT
I'm considering moving to a balun/cat5 solution, Allan. I've not had luck getting all the lines out of my s-video feed.
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Post by Deleted on Feb 6, 2015 11:00:29 GMT
Give it a go Rick. Its not an expensive solution and works well for me.
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Post by davy on Feb 6, 2015 13:24:04 GMT
Mines was sorted out by coaxial cable 75 ohms with bnc connections
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Post by Rick in NWArk on Feb 6, 2015 18:37:34 GMT
Davy,
I have the MallinCam MV-1-E which lets me darken the background on S-Video feeds, so I'd like to keep with S-Video if I can. I have also used CoAx. I have thousands of feet of it, actually, from another hobby that uses video feeds. I'll be honest -- I havent done a close comparison of S-Video and Composite. I'm skeptical that there would be any quality difference, other than the adjustments I can do with the capture device.
--Rick
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Post by Dragon Man on Feb 7, 2015 13:06:50 GMT
I have absolutely no idea if Svideo is any better than Composite (AV). I've only ever used Composite.
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Post by Deleted on Feb 8, 2015 18:51:07 GMT
I have absolutely no idea if Svideo is any better than Composite (AV). I've only ever used Composite. Hi Ken,
In normal everyday use, Y/C certainly has the edge over Composite, (400 lines res over 240 lines if everything was working at full spec with top end gear (domestic Y/C was more likely less than 400 lines). However, in astro use generally, I have found very little difference in practise. I used to record to a Hi-8 recorder with both Y/C and Composite outputs from the same camera, I used the Composite to overlay date-Time etc.on the clip so I always knew what when it was recorded, then switch to Y/C for recording the actual image. The difference seen visually on a Sony broadcast 14" colour monitor was minimal. In everyday applications with a scene in colour, yes, the image is sharper with no colour cross talk when using Y/C, the visual difference between Composite & Y/C is easily seen. I was using top end Sony equipment because I had access to all the right gear, and used to test a wide range of video camera makes using astro imaging as a test of various factors. I was often surprised at the variations across the top manufacturers, sharpness, noise, dynamic range etc.
Clear skies... Shevill
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Post by Deleted on Feb 8, 2015 19:00:34 GMT
Back to this old chestnut again..few clearish nights for me..had to wait on moon clearing my fov started picking up stars ect in the 6mm on the flip..switched to camera. .bloomin phase lines on monitor. .this is with my decent power supply aaargh had it befire with piwer supply I got with the pd1.. going to battery power from my portable array and use one of its cameras.. Hi,
I have always powered my cameras from a gel cell source-even in both my observatories where I have mains power and expensive 12 Volt DC power sources. A Battery is as clean DC as you can get. It also avoids any ground loop issues which are often the cause of 50 cycle phase lines scrolling up the screen, often a problem with several bits of equipment with different earthing paths. Many TV monitors also produce RF interference which can be picked up by the camera/cables when in close proximity to each other. I have 18 to 80 Amp/hr batteries in both observatories and as portable gear which supply camera power, on trickle charge during the day so always ready for extended use at night. Eliminates a lot of problems and have used this method since 1988.
Clear skies... Shevill
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Post by Deleted on Feb 8, 2015 19:09:42 GMT
Good point John. Also, don't use the same power supply that you are running your mount with. That's not good. Use a separate power supply for the camera. A 1 or 2 amp will do. Hi, A 7 Amp/hr gel cell will power your camera longer than you can stay awake, look at the camera specs, they actually draw very little power, maybe less than 200 milli Amps-even at 500 milli Amps, that is 14 hours using a 7 A/Hr Gel Cell. I have several such sealed lead acid batteries in use now for over 10-years, on a trickle charger when not in use, so always ready and never a flat battery. Leaving a battery to slowly lose its juice is the quickest way to kill it and or shorten its life. I use a proper Gel Cell charger adapter with red & green LEDS, which shows the state of battery charge, i.e charging, charged, full, etc.
Never had any power problems, interference etc and never powered my cameras from anything else, always used a separate battery for the camera/s supply.
I am a very fast learner and do not like to waste dark skies on simple easily fixed technical problems.
Clear skies... Shevill
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Post by davy on Feb 8, 2015 20:27:27 GMT
Got to agree shevill I have converted my kit to a golf cart battery 22amph this will run my kit no problem I believe..cameras were .2 of an amp ( x4 cameras) 12v dc dvr and monitor and 2amps on slew on eq3 mount..my portable array has back up croc clips and cigarette lighter adapter if I need a boost in amp's to run my kit.. ive gave up on weather just now and concentrating on research and development just now
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