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Hahahah that reminds me of the time my friend lived in the top floor of an apartment. He had a unit that plugged into the audio out of the tv and modulated the signal to FM band so you could use the stereo to simulcast the audio,,
He hooked it to the VCR and dropped in a porn and let it run, he later noticed a crowd of kids gathering around a car downstairs listening in... SR |
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
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I can tell you that such signals are viewable all over much of the San Francisco Bay Area when I get on the air, with easy-to-obtain equipment and the NTSC TV sets you already have. This is TV over ham radio (known as "amateur television" or ATV), and you do need a license but the tests are not too hard to pass. Let me know!
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Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did." |
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Back around 1978, someone in Syracuse did essentially that. Channel 7 was empty (Syracuse had then only 4 TV channels), and word had it that the transmitter was made from an old guitar amplifier. VCRs were a new product, and they played tapes of Star Trek, some porn, and such... Went on the air a Friday night and shut down Sunday night (the nearest FCC field office was about 150 miles away, in Buffalo, and they didn't work on weekends). Seems it was the first pirate TV station ever done. It got a short article in the New York Times.
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#20
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You have a W callsign which means you have been a radio user FOR ALONG TIME!! (They havent issued W calls in many years) Whats the farthest you have talked buddy?? |
Audiokarma |
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I am a ham radio operator as well, and with a "W" call sign. Got my first amateur license in 1972 and am presently licensed (my callsign appears after my signature), so I've been fooling around with the hobby in one form or another over 40 years. Am now on 2-meter FM and Echolink (an amateur radio linking application that connects licensed amateurs to other amateur stations via their computers) because I live in an apartment building and, even though my landlord would allow it (I asked him about this some months ago), do not want to go to the trouble of erecting an antenna.
VK member ChrisW6ATV has a point as far as legitimate amateur radio operating is concerned, and a darn good one at that. Licenses are always required for any type of operating in the amateur bands, even if you use just a 100-mw (0.1 watt) transmitter. There are no exceptions. The Federal Communications Commission (FCC) has very strict rules regarding unlicensed amateur operating; the penalties range from very hefty fines to, at worst, imprisonment. I would even be leery of using a VCR's RF modulator as a transmitter, its very short range notwithstanding. These modulators are not intended to be used as transmitters; their only purpose is to generate an NTSC TV signal on channel 3 or 4 to be sent over a coaxial cable to the TV set. The FCC's rules set very strict limits on the amount of RF leakage from any modulator, whether built in to a VCR or outboard. This is why any attempt to use a VCR, or a standalone RF modulator (as used with DVD players), as a low-power TV transmitter will yield very disappointing results if you are looking for any kind of range (read miles). That is, the dodge will work if your TV is within, for example, 200 feet or less of the antenna, but don't try to use it to broadcast your VCR's RF output to a television in the next room--it will not work, and if you try to boost the signal by any means, you will be running afoul of the FCC's rules and could be subjected to a fine or a jail sentence as well, as I said above. Best to get an amateur radio license and transmit amateur television signals legally, in the 432-MHz range.
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Jeff, WB8NHV Collecting, restoring and enjoying vintage Zenith radios since 2002 Zenith. Gone, but not forgotten. Last edited by Jeffhs; 08-30-2014 at 08:53 PM. |
#22
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From northern California, the farthest, I am not sure, maybe South Africa. That is on the shortwave/"HF" radio bands. The live TV signals are on UHF bands (above TV channel 83, or below channel 14) and they go through a repeater (relay station) on a mountaintop 3000-3500 feet in the air. By using that mountaintop repeater (there are two different ones near here for ATV), others watching (and sending their own video signals back) have been 70-100 miles away at times.
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Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did." |
#23
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Just for "fun", this Web page has a chart that seems to say that the output of a Blonder-Tongue AM60-550 modulator at maximum (+60dBmV if I understand them right) is about 13 milliwatts connected to a 75-ohm antenna (load).
http://www.maximintegrated.com/en/ap...dex.mvp/id/808
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Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did." |
#24
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transmit anything entertaining. You can't legally use a DVD or repeat OTA, and even making actual shows yourself is a bit iffy. Of course you could make travelogues of your vacation with callins using ham radio, etc., and that would be 100% legal. And at the full legal power you'd go a long way. What are the cable channel numbers in the 432 MHz band? 69? But for around the house on an antenna (and at full power out a good fraction of a mile, quite illegal) you won't beat the Blonder-Tongue BAVM, which are always available on Ebay for under $40, if you just wait for the channel you want. I have a Ch. 6 and a Ch. 10. They are wired to all my old TVs but the leakage inside the TVs is so bad that I can pick them up anywhere in the house and a bit outside on my Watchman. At full power the leakage gives excellent pictures on the Watchman. With the power way down pictures are excellent on the wired TVs. |
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