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#11
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small antennas
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#12
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small antennas
On Sep 16, 3:33*pm, John Smith wrote:
wrote: ... No, they are declining if you are talking about anything over 200m. They are also losing spectrum for example in 40m to amateurs. No, the AM Broadcast Band is the MW band, ~.5Mc to ~1.800Mc ... not related to happenings in the 40m amateur band at all ... But I qualified the statement by saying anything above 200m (in wavelegth) which you faithfully quoted above. Minus 2 points for John. John, Quiz Question: Suppose you tried to modulate a 14 Khz carrier with a 50MHz digital signal. Would that be possible? (Y/N) Where would you locate the side bands? (________ and ________) A nut would attempt that ... others would modulate the 50Mhz signal ... and 49.993 to 50.007 ... in a perfect world. OK, now, since 50MHz is being modulated, how much bandwidth will each sideband occupy? Cannot be done, John. HF frequencies can only handle insignificant amounts of data information making them useless in today's digital age. THAT is why (to answer the original question) nobody gives a damn about small antennas on HF frequencies. The data we are transferring today goes far beyond a simple 10KHz voice communication on a small section of spectrum. Even a single analog TV channel occupies 5MHz which I think would cover the entire HF spectrum if it were tried. There are some exceptional HF digital applications which society can find useful in extremely limited applications such as sail mail but even that is quite disruptive due to the wide chunk of HF it occupies for a single email transmission. Really, you need a beginners group ... :-( *Won't your mom play with you today? RRAP IS a beginners group John. |
#13
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small antennas
On Sep 16, 4:09*pm, John Smith wrote:
wrote: ... No, they are declining if you are talking about anything over 200m. They are also losing spectrum for example in 40m to amateurs. John, Quiz Question: Suppose you tried to modulate a 14 Khz carrier with a 50MHz digital signal. Would that be possible? (Y/N) Where would you locate the side bands? (________ and ________) Yanno'? *This is all closely related to the "Personal Attack Ploy." (also, known by other names) However, this one goes, "I will think up an extremely complex trick question from my gorgeously, exquisitely, intellectual mind. *I will then trip up the "mark" with my beautiful complex and deep plan, and use this error on "subject A" to prove his statement on past "subject B" is wrong, by sheer implication ... " *I see this used on Cecil OFTEN, and by the same ignoramuses a LOT ... I often wonder, "Is anyone here aware enough to wonder if I see this or not? *If others here notice, or not?" * ROFLOL! Most of us tried this in grade/high-school, did not find we got the results we expected, abandoned it, and moved on ... You may wish to consider the same, or not ... however, I do see, with the "resources" available here, this childish ploy is VERY much alive and well! *And, I have noticed it is accepted as being effective, by those ignorant to what it really reflects ... like the petty workings of their small minds! Somehow, this all reminds of a gathering of old men at a botchiball court!, "elmering" a new "Botchiball Recruit." *scratches-head Regards, JS heh heh...but we have it documented in this thread. You fell for it the first time and after your posted your answer you saw what you call the "trick" after thinking about it. Actually, I was only trying to cut through the BS to let you see for yourself why HF is not so valuable in today's information age in which only GHz level frequencies and above are useful for practical quantities of information transfer. But you did catch it, albeit your were a little slow on the pick up. |
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#15
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#16
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#17
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small antennas
Art Unwin wrote:
I am begining to believe that there is really no interest in small antennas I'm interested, Art. I have a small antenna for 432 MHz and an even smaller one for 1296 MHz. Dave K8MN |
#18
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small antennas
Art Unwin wrote:
If you are looking for a University to compare with try Rhode Island I don't believe any University can show antenna results in the past few years that are better than those produced in any other state. Perhaps it takes a small state to research small antennas. What has your State University done that is notable? It has lost two of its three football games. Dave K8MN |
#19
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small antennas
Dave Heil wrote:
Art Unwin wrote: If you are looking for a University to compare with try Rhode Island I don't believe any University can show antenna results in the past few years that are better than those produced in any other state. Perhaps it takes a small state to research small antennas. What has your State University done that is notable? It has lost two of its three football games. Dave K8MN What about CalTech, a hotbed of physics.. undefeated in football since 1993.. |
#20
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small antennas
Jim Lux wrote:
Dave Heil wrote: Art Unwin wrote: If you are looking for a University to compare with try Rhode Island I don't believe any University can show antenna results in the past few years that are better than those produced in any other state. Perhaps it takes a small state to research small antennas. What has your State University done that is notable? It has lost two of its three football games. Dave K8MN What about CalTech, a hotbed of physics.. undefeated in football since 1993.. Heh. We counted too much on Pat White. Dave K8MN |
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