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#11
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Sidebands
On Wed, 22 Dec 2010 10:38:54 +0000, Jeff rearranged some electrons to say:
On What if both sidebands are NOT "saying the same thing"? Then, for instance, you can broadcast stereo in a way that receivers mixing the two sidebands will still receive an acceptable mono signal. I am trying to find if that SSB from 1915 were the distance dependent. S* Distance from where? You are not making sense. Jeff He never does. |
#12
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Sidebands
Użytkownik napisał w wiadomo¶ci ... Szczepan Bialek wrote: Here are thy unrestricted signal (upper diagram). It has the three peaks: http://en.wikipedia.org/wiki/File:Pa...schematic3.png So in an old radio the same station was in the three places (on the scale) close to one another. Am I right? S* Nope, you haven't the slightest bit of understanding of what the term "passband" means so your question is nonsense. "Radio receivers generally include a tunable band-pass filter with a passband that is wide enough to accommodate the bandwidth of the radio signal transmitted by a single station." For me a radio is a box with the knob to rotate. Now at FM no brakes between stations. At AM are. What was in 1915? S* |
#13
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Sidebands
Uzytkownik "Jeff" napisal w wiadomosci ... I am trying to find if that SSB from 1915 were the distance dependent. S* Distance from where? You are not making sense. From the station. S* |
#14
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Sidebands
Nope, you haven't the slightest bit of understanding of what the term "passband" means so your question is nonsense. "Radio receivers generally include a tunable band-pass filter with a passband that is wide enough to accommodate the bandwidth of the radio signal transmitted by a single station." That statement is at best misleading, and in some cases incorrect. In most receivers any *tunable* filter is MUCH MUCH wider than the bandwidth required to accommodate the bandwidth of the signal transmitted. The selectivity being produced by one or more *fixed* frequency filters which are just wide enough to accommodate the bandwidth of the wanted signal. For me a radio is a box with the knob to rotate. Now at FM no brakes between stations. At AM are. What was in 1915? S* In 1915 there were no broadcast stations to speak of so your dial would be just one large "brake" (sic). Jeff |
#15
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Sidebands
I am trying to find if that SSB from 1915 were the distance dependent.
S* Distance from where? You are not making sense. From the station. S* ________________ Radio waves behaved the same in 1915 as they do now. The distance to a given field intensity, for the same conditions, is the same now as it was then. |
#16
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Sidebands
On 22/12/2010 17:10, Szczepan Bialek wrote:
Uzytkownik "Jeff" napisal w wiadomosci ... I am trying to find if that SSB from 1915 were the distance dependent. S* Distance from where? You are not making sense. From the station. S* If you tell us where you are and which station you are talking about we might be able to find the distance!! Jeff |
#17
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Sidebands
Richard Fry wrote:
Radio waves behaved the same in 1915 as they do now. Well sort of :-) Before (and during) WWI, anything below 200 meters (over 1.5 mHz) was considered too high in frequency to be useful. Geoff. -- Geoffrey S. Mendelson N3OWJ/4X1GM Those who cannot remember the past are condemned to misquote it. |
#18
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Sidebands
Szczepan Bialek wrote:
UĆŒytkownik napisaĆ w wiadomoĆci ... Szczepan Bialek wrote: Here are thy unrestricted signal (upper diagram). It has the three peaks: http://en.wikipedia.org/wiki/File:Pa...schematic3.png So in an old radio the same station was in the three places (on the scale) close to one another. Am I right? S* Nope, you haven't the slightest bit of understanding of what the term "passband" means so your question is nonsense. "Radio receivers generally include a tunable band-pass filter with a passband that is wide enough to accommodate the bandwidth of the radio signal transmitted by a single station." Oh goody, you can cut and paste from a web site. Yet you have no clue what the quote means or the implications of having ommited any mention of the IF stages of a receiver. For me a radio is a box with the knob to rotate. Now at FM no brakes between stations. At AM are. Gibberish. What was in 1915? S* The battleship HMS Formidable is sunk off Lyme Regis, Dorset, England, by a German U-Boat. An earthquake (6.8 in Richter scale) in Avezzano, Italy, kills more than 29,000. The 1915 locust plague breaks out in Palestine; it continues until October. The theory of general relativity is formulated. The first prototype tank is tested for the British Army for the first time. -- Jim Pennino Remove .spam.sux to reply. |
#19
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Sidebands
Szczepan Bialek wrote:
Now my radio use FM. The one station is on the distance circle 1cm. In 1915 was the same for AM? S* Gibberish. -- Jim Pennino Remove .spam.sux to reply. |
#20
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Sidebands
Szczepan Bialek wrote:
I am trying to find if that SSB from 1915 were the distance dependent. S* Babbling gibberish. SSB was a laboratory curiousity in 1915 and was little more than a set of equations. -- Jim Pennino Remove .spam.sux to reply. |
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