Post by dwight on Nov 14, 2005 22:15:14 GMT -4
Gadou, welcome aboard.
I don't know how you could remain a camera operator for 25 years if you can't get your head around pre-emptive pan/tilt/and zoom. All the techniques featured on the A17 lunar ascent are accepted standard TV techniques used in sports events, and remote camera operations.
I have routinely panned a camera and managed to shoot a football landing centre frame. Why? Because I know about pre-emptive shot setup. How can you not ever have done this being a camera operator. I have also used remote control cameras with a delay in reaction time from movement of the joystick, to actual movement of the camera. Learning curve adaptation for me has been under 5 minutes to become accustomed to pan/tilt/zoom delay. Zooming out, and tilting up, with the aid of a precalculated countdown would defeintely not be the most difficult facet of TV work I would ever have done.
Perfect shoot? The horizontal level is off, the camera zooms out in broken nonfluid motion, the LM is lost after 40 seconds. This is not the type of "perfection" my superiors would be happy about. For ENG type live material, then its fairly good considering, but my studies of classic picture composition tell me the shot needs alot of work in order to be perfect.
The technology for the time was well capable of transmitting what was transmitted. Right down to the disc array RGB composition back on earth. The colour wheel camera was in fact several decades old by the time of Apollo. Remote Control devices were used as early as WW1 to guide boats loaded with explosives into enemy boats. Remote Control in TV was developed as early as 1957, a good 15 years before the A17 mission.
The Rover was transmitting only twice while on the move, and both times it was just after "wheels up". You must know the difference between NTSC 525/60 and 16mm film. See those speckles, grain, scratches and higher contrast ratio on the rover film, that means they are filmed and not videotaped. While moving the rover transmitted around 20 seconds of usable footage. That is why it was turned off during traverse (with the exceptions of the two times it was left on prior to driving). The picture breakup is exactly what should occur when the uplink dish was not properly aligned with the tracking stations. No TV satellite was used, even though Telstar was in earth orbit several years prior to Apollo.
Moon Man, also a belated welcome, and with all due respect, please bone up on how the TV signal was transmitted back to earth before denouncing the way it was done. I invite you to call up any TV studios uplink centre and explain to them how TV signals could not be transmitted via line of sight to a 64 meter receiving dish based on earth. Should any person deny the basic principles of such transmission, please put them in touch with me, as I'd be very interested to know why the company they work for continues to keep them in their employ.
Ultimately the size of the Rx dish is what makes or breaks the signal, not the size of the Tx dish. Other than the advancement of TV signals into digital MPEG2, the principles of TV transmission remain unchanced. Indeed analog TV was more accomodating to error than current digital technology.
Cold doesn't affect Tx nor Rx. Icing on the Rx dish certainly does. I don't know what equipment you use in Rx, but I'd be very worried if you haven't got a thermostat and deicer in place. Ice is something that generally doesn't cause problems on the moon, nor at the Australian tracking stations for that matter. Cloud cover can cause problems, but generally only when a pretty major storm is directly overhead.
If you have trouble believing Tv transmission works the way it does, I strongly urge you to thow away your TV set as the fact that it works is more miraculous than any TV transmitted from the moon.
cheerio
Dwight
RTL TX
I don't know how you could remain a camera operator for 25 years if you can't get your head around pre-emptive pan/tilt/and zoom. All the techniques featured on the A17 lunar ascent are accepted standard TV techniques used in sports events, and remote camera operations.
I have routinely panned a camera and managed to shoot a football landing centre frame. Why? Because I know about pre-emptive shot setup. How can you not ever have done this being a camera operator. I have also used remote control cameras with a delay in reaction time from movement of the joystick, to actual movement of the camera. Learning curve adaptation for me has been under 5 minutes to become accustomed to pan/tilt/zoom delay. Zooming out, and tilting up, with the aid of a precalculated countdown would defeintely not be the most difficult facet of TV work I would ever have done.
Perfect shoot? The horizontal level is off, the camera zooms out in broken nonfluid motion, the LM is lost after 40 seconds. This is not the type of "perfection" my superiors would be happy about. For ENG type live material, then its fairly good considering, but my studies of classic picture composition tell me the shot needs alot of work in order to be perfect.
The technology for the time was well capable of transmitting what was transmitted. Right down to the disc array RGB composition back on earth. The colour wheel camera was in fact several decades old by the time of Apollo. Remote Control devices were used as early as WW1 to guide boats loaded with explosives into enemy boats. Remote Control in TV was developed as early as 1957, a good 15 years before the A17 mission.
The Rover was transmitting only twice while on the move, and both times it was just after "wheels up". You must know the difference between NTSC 525/60 and 16mm film. See those speckles, grain, scratches and higher contrast ratio on the rover film, that means they are filmed and not videotaped. While moving the rover transmitted around 20 seconds of usable footage. That is why it was turned off during traverse (with the exceptions of the two times it was left on prior to driving). The picture breakup is exactly what should occur when the uplink dish was not properly aligned with the tracking stations. No TV satellite was used, even though Telstar was in earth orbit several years prior to Apollo.
Moon Man, also a belated welcome, and with all due respect, please bone up on how the TV signal was transmitted back to earth before denouncing the way it was done. I invite you to call up any TV studios uplink centre and explain to them how TV signals could not be transmitted via line of sight to a 64 meter receiving dish based on earth. Should any person deny the basic principles of such transmission, please put them in touch with me, as I'd be very interested to know why the company they work for continues to keep them in their employ.
Ultimately the size of the Rx dish is what makes or breaks the signal, not the size of the Tx dish. Other than the advancement of TV signals into digital MPEG2, the principles of TV transmission remain unchanced. Indeed analog TV was more accomodating to error than current digital technology.
Cold doesn't affect Tx nor Rx. Icing on the Rx dish certainly does. I don't know what equipment you use in Rx, but I'd be very worried if you haven't got a thermostat and deicer in place. Ice is something that generally doesn't cause problems on the moon, nor at the Australian tracking stations for that matter. Cloud cover can cause problems, but generally only when a pretty major storm is directly overhead.
If you have trouble believing Tv transmission works the way it does, I strongly urge you to thow away your TV set as the fact that it works is more miraculous than any TV transmitted from the moon.
cheerio
Dwight
RTL TX