On Thu, 03 Jun 2004 00:26:55 -0700, Frank Gilliland
wrote:

Are you sure about that? I thought they used NBFM as far back as the
Mercury program, but I could be mistaken.


yes,they were am, 3 watts if i remember correctly. thats why you never heard a
squelch tail.

Ever see Capricorn One?

yes, i have it on dvd. the moon missions weren't faked.

In ,
(Snotgeorge) wrote:

On Thu, 03 Jun 2004 00:26:55 -0700, Frank Gilliland
wrote:

Are you sure about that? I thought they used NBFM as far back as the
Mercury program, but I could be mistaken.


yes,they were am, 3 watts if i remember correctly.


http://www.svengrahn.pp.se/trackind/...7/APOLLO17.htm


thats why you never heard a
squelch tail.


Maybe you missed the part about Quindar tones:

http://www.hq.nasa.gov/office/pao/Hi...j/quindar.html


Ever see Capricorn One?

yes, i have it on dvd. the moon missions weren't faked.


No, but the movie was good entertainment, complete with roger-beeps!
"Marooned" was pretty good, too. I didn't like "Apollo 13" as much as
I thought I would -- computer animation has come a long way, but it
still looks fake when compared to the special effects that were
state-of-the-art just before computers took over the scene. Damn
accountants!






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On Thu, 03 Jun 2004 05:10:33 -0700, Frank Gilliland
wrote:
Maybe you missed the part about Quindar tones:


yes i did sorry. quindar tones were only used on the uplink, not the downlink.
i still think if the downlink were fm that you would here the squelch tail when
the downlink unkeyed. ?

No, but the movie was good entertainment, complete with roger-beeps!
"Marooned" was pretty good, too. I didn't like "Apollo 13" as much as
I thought I would -- computer animation has come a long way, but it
still looks fake when compared to the special effects that were
state-of-the-art just before computers took over the scene. Damn
accountants!

very true. i think the hbo series about apollo was better than the movie

In ,
(Snotgeorge) wrote:

On Thu, 03 Jun 2004 05:10:33 -0700, Frank Gilliland
wrote:
Maybe you missed the part about Quindar tones:


yes i did sorry. quindar tones were only used on the uplink, not the downlink.
i still think if the downlink were fm that you would here the squelch tail when
the downlink unkeyed. ?


That's because there was no squelch. Audio was phase-modulated onto a
subcarrier of the uplink/downlink carriers, and both were continuious
transmissions. The Quindar tones were used to flip between the mod and
demod circuits. I would assume that full duplex audio was possible but
wasn't used in order to save weight, power and bandwidth.


No, but the movie was good entertainment, complete with roger-beeps!
"Marooned" was pretty good, too. I didn't like "Apollo 13" as much as
I thought I would -- computer animation has come a long way, but it
still looks fake when compared to the special effects that were
state-of-the-art just before computers took over the scene. Damn
accountants!

very true. i think the hbo series about apollo was better than the movie


I haven't seen that yet, but I'll watch the schedule to see if it's on
again.





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