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#71
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AM electromagnetic waves: 20 KHz modulation frequency on anastronomically-low carrier frequency
Jeff Liebermann wrote:
Conventional TV is VSB (visidual side band) Vestigal Sideband -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#72
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AM electromagnetic waves: 20 KHz modulation frequency on anastronomically-low carrier frequency
On 7/2/07 6:45 AM, in article , "John Smith"
wrote: Don Bowey wrote: ... Would you please come and ask nicely. I don't like how you put your order. Get back on your meds and cease and desist from bothering the other mental patients--else you get the straight jacket next! grin JS Your attempts at presumed humor, are as bad as your AM knowledge. :^) |
#73
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AM electromagnetic waves: 20 KHz modulation frequency on anastronomically-low carrier frequency
On 7/2/07 6:45 AM, in article , "John Smith"
wrote: Don Bowey wrote: ... Would you please come and ask nicely. I don't like how you put your order. Get back on your meds and cease and desist from bothering the other mental patients--else you get the straight jacket next! grin JS By the way, I looked at the wiki link you posted and I can see why you are misinformed by it; it's author was either simply not clear in his own mind, or he did not understand that the "undulations" on the telephone line DC voltage is NOT amplitude modulation in the multiplier sense. It is not AM as it is being discussed in this thread of Radium's original post. If you prefer the math proof, multiply the DC voltage frequency (0) by the audio frequency (pick a number between 200 and 3000 Hz), and the product is zero - No new frequencies are present. There's more to it than that but I probably already lost you. |
#74
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AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
In message , Michael A. Terrell
writes Jeff Liebermann wrote: Conventional TV is VSB (visidual side band) Vestigal Sideband Better still, Vestigial Sideband! -- Ian |
#75
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AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
kev hath wroth:
Jeff Liebermann wrote: Watch antennas: http://www.c-max-time.com/products/productsOverview.php?catID=5 See the photos of the various antennas. Too bad there's no specs. I'll grind out the field strength numbers later. I've been living in the microwave region for so long, that I'm having problems with LF calcs. http://www.c-max-time.com/downloads/getFile.php?id=423 Gives dimensions,No of turns,Inductance etc. Thanks. I downloaded that yesterday and got a file with no extension. I eventually figured out it's a PDF file and renamed it. The site also has a rather sketchy article on antenna design at: http://www.c-max-time.com/tech/antenna.php I also found the chip sensitivity somewhere at 0.5uv typical 0.8uv max with a field strength range of: 15-20 uV/m using a 10mm x 60 mm rod. I'm currently slogging through the NIST web pile trying to find the historical or estimated field strengths for the left coast area. http://tf.nist.gov/timefreq/stations/lflibrary.htm Ah, foundit: http://tf.nist.gov/timefreq/general/pdf/1383.pdf Table 2.4 shows signal strength in San Diego varying from 180 uV/m to 1000 uV/m. Now all I need to do is figure out how much S/N ratio is required at the receiver input to properly decode the time signals. All the information needed is probably there, scattered among an assortment of documents, but I'm at a loss on how to estimate the actual field strength sensitivity given the rod antenna specifications. The formula #1 at: http://www.c-max-time.com/tech/antenna.php has all the right parameters, but I keep getting insane results when I try to plug in real and estimated values. Maybe some coffee will help. I'll work on it more during the next few daze. It should be easy (famous last words). However, paying work comes first. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#76
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AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
"Michael A. Terrell" hath wroth:
Jeff Liebermann wrote: Conventional TV is VSB (visidual side band) Vestigal Sideband Ummm... How about Vestigial Sideband instead? http://www.javvin.com/hardware/VSB.html http://whatis.techtarget.com/definition/0,,sid9_gci332235,00.html The last vestige of spelling abilities disappeared long ago and was replaced by a spellin chequer that lacked the term. Sorry. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#77
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AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
On Mon, 2 Jul 2007 16:41:01 +0100, Ian Jackson wrote:
In message , Michael A. Terrell writes Jeff Liebermann wrote: Conventional TV is VSB (visidual side band) Vestigal Sideband Better still, Vestigial Sideband! You're both wrong. It is VIRTUAL SIDEBAND because it isn't completely real and the other sideband which isn't virtual carries the missing high frequency modulation info. Once it gets into your second detector then it becomes real due to the laws of product modulation. Next, you will be telling people that VGA doesn't stand for "virtual graphics array." -- Posted via a free Usenet account from http://www.tarrnews.net |
#78
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AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-lowcarrier frequency
Don Bowey wrote:
... Yeah, idiot, lot a proof there. NO modulation at all, krist, the guy on the other end is only carrying on a "virtual conversation!" Excellent use of logic, keep up the good work ... JS |
#79
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AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-lowcarrier frequency
John Smith wrote:
[stuff] And, by the way, when using plate modulation on a transmitter, the DC input to plates of the transmitter has a modulated signal impressed upon it by a modulation transformer (simply an audio transformer), every watt of power to the xmitter is so impressed ... The DC voltage/current to the xmitter contains the voice data--indeed, the exact same data which is impressed onto the DC on a telephone line (voice/modulation.) However, the real importance of this will only become clear to you when you come out from under the influence of whatever it is you are smokin' ... JS |
#80
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AM electromagnetic waves: 20 KHz modulation frequency on anastronomically-low carrier frequency
On 7/2/07 10:53 AM, in article , "John Smith"
wrote: Don Bowey wrote: ... Yeah, idiot, lot a proof there. NO modulation at all, krist, the guy on the other end is only carrying on a "virtual conversation!" Excellent use of logic, keep up the good work ... JS The problem is, you are too ignorant to understand the terms being used. |
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