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Post InfoTOPIC: Live TV Feeds From The Moon in 1969?? Really?
Posted By: Jim Oxx

Posted On: Jul 20, 2009
Views: 1314
Live TV Feeds From The Moon in 1969?? Really?

This is the point that I have always wondered about. Disappointed that its not raised here.


Posted By: Keith Mayes

Posted On: Jul 20, 2009
Views: 1310
RE: Live TV Feeds From The Moon in 1969?? Really?

Are we to understand that you have some sort of problem with the live transmissions from the lunar surface during the Apollo era? If that is the case then you need to say what it is.


Posted By: Wormwod

Posted On: Jul 23, 2009
Views: 1295
RE: Live TV Feeds From The Moon in 1969?? Really?

I will assume you don´t think it possible to transmit live TV pictures from the moon.

It is no different to transmitting live pictures on Earth, and we had been doing that for decades, the first colour transmission being in 1928 in England.
I cannot see what your problem is, and Keith can´t either.


Posted By: Jim C.

Posted On: Aug 20, 2009
Views: 1265
RE: RE: Live TV Feeds From The Moon in 1969?? Really?

I just read an interesting in a magazine called "Government Video." It is a trade magazine for people who do video production for governments from local to national. I work in a high school.

People who wonder how we got live TV from the moon have a basic misconception of how TV works. NASA did not need to take a 239,000 mile long camera cable with them. All they needed was a video signal that could be sent over 500 kHz of bandwidth.

The camera was developed by Westinghouse using a new imaging device called the secondary electron conduction (SEC) tube. It was extremely sensitive and, according to the article, "...it could make pictures of the proverbial black cat in a coal bin at midnight." It is a stunning piece of equipment, much smaller and more advanced than the bulky studio cameras of the day. It almost looks like a chrome oil pan from a custom V-8 engine with a lens sticking out of the front.

The camera almost didn't go to the moon. Westinghouse had trouble with the restrictions on bandwidth, a 300 line resolution and the proposed 10 frame per second non-interlaced signal requested by NASA. But by using an image converter put together by RCA, the whole thing sort came together.

If you ever wondered why the moon video had a lot of noise and ghosting it was due to the image converter. It was essentially a full resolution camera pointed at TV showing the "slow scan video images."

So, not a conspiracy and not yet another thing NASA engineers forgot to hoax. Its just science and innovation. Like the whole moon landing was.


Posted By: Dwight

Posted On: Oct 2, 2009
Views: 1227
RE: RE: Live TV Feeds From The Moon in 1969?? Really?

The TV signal was sent in the USB signal (along with telemetry and biomed data). This was then received at either Goldstone, USA; Honeysuckle Creek, Australia, or Madrid, Spain. The signal was extrapolated and converted to a regular TV image. For Apollo 7, 8 9 and 11's EVA the TV signal was upconverted to standard NTSC and sent on the TV netwroks. For all the other instances the sequential color signal was put through a disc recorder system and extrapolated into full NTSC color. The size of the receiver antenna is what made a dramatic improvement in signal quality. Case in point: compare the Honeysuckle segments of A11 to that of Parkes, which had a 64 meter antenna. In all lunar mission cases the TV signal was direct line of sight. The tracking stations were position on earth in regions with stable weather, and remote enough to not be affected by surrounding radio noise.


Posted By: Dwight

Posted On: Oct 2, 2009
Views: 1226
RE: Live TV Feeds From The Moon in 1969?? Really?

On top of the three main NASA sights, Bochum Observatory in Germany was able to receive the TV signal independantly of NASA. They used appropriate receivers and simply locked onto the signal coming from the moon. The main difference with their recordings is that they do not have Houston's comments, as they only received the Apollo signal.


 

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