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Old 17th August 2010, 06:47 AM   #21
Pano is offline Pano  United States
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Good info, thanks!
S-Band is used for space mission voice. Well, gee, it's also used for satellite radio. While XM and Sirius content leave a bit to be desired, the voice quality is OK. And one might hope that NASA has better antennas than my car.

I am really beginning to think it's all an act. They want it to sound that way.

Here's some tech info on the Apollo radio with some links to more info at the bottom.
http://en.wikipedia.org/wiki/Unified_S-Band
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Old 17th August 2010, 07:41 AM   #22
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The same is the case with jet pilot comms. With clear comms so important for safety, I'm sure if there was an easy way to improve it, someone would have made a big buck on it years ago.

From my experience in mil comms I can mention two factors:

- because of the high ambient noise they need to use either throat mikes or noise cancellation mikes. The first are very prone to compression and distortion, the latter may suffer from the cancellation process,

- there's a lot of electrical noise also. I remember in my work the all-pervasive 400Hz from the mains, both on all signals and as acoustical noise. Then add in all the digital noise, the radios and radars around you and you've got an EMI nightmare.

jd
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Old 17th August 2010, 12:52 PM   #23
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Quote:
Originally Posted by imix500 View Post
Heh, yeah I'm from Huntsville. Raised by a Nasa dude.
hmmm, is your last name Von Braun?
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Old 17th August 2010, 03:13 PM   #24
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Originally Posted by janneman View Post
The same is the case with jet pilot comms. With clear comms so important for safety, I'm sure if there was an easy way to improve it, someone would have made a big buck on it years ago.

From my experience in mil comms I can mention two factors:

- because of the high ambient noise they need to use either throat mikes or noise cancellation mikes. The first are very prone to compression and distortion, the latter may suffer from the cancellation process,

- there's a lot of electrical noise also. I remember in my work the all-pervasive 400Hz from the mains, both on all signals and as acoustical noise. Then add in all the digital noise, the radios and radars around you and you've got an EMI nightmare.

jd
A friend who used to work as a tank mechanic claimed to have made a line-level audio interconnect out of the cable connecting the headset to the tank. He claims speech is very clear but everything else is not there.
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Old 17th August 2010, 04:28 PM   #25
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Bas, so was the russian shuttle, Buran. But the computers they designed for it are still amazing.
I agree with you. I did not get my point across well enough. The 70's solid state stuff was not the best for audio or so I've been told.

And I was sort of trying to answer the
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can beam 100s of SD and HD video and audio channels
statement.
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Old 17th August 2010, 04:32 PM   #26
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So what's up with the rotten audio from the NASA missions? It has bugged me for years. Ever notice how bad it is? Why?
I reckon one or two LossLess Blackbodies would solve the rotten audio.
Blackbody - $959.00 : LessLoss high end audio power cables, audiophile power cables, audiophile cables

Perhaps a few in Houston too.
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Old 17th August 2010, 04:42 PM   #27
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Sure, but by the time that got into space, they would cost at least 10X that.
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Old 17th August 2010, 04:43 PM   #28
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Old 17th August 2010, 04:50 PM   #29
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It's like the Python sketch with the machine that goes Ping! Maybe the techs do it just to please the NASA top brass.
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Old 17th August 2010, 04:53 PM   #30
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Sure, but by the time that got into space, they would cost at least 10X that.
But they could be sold for 100x original cost. Because they will have been in space. With all the benefits of having been away from the earth's magnetism and the cosmic rays...etc., etc.
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