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#11
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Why?
And then, as I said, each antenna system is different at close range. It could be only a volt or two per meter, it could be several tens of volts...close enough, you might even be able to draw an arc off of the metal pieces. It's too undefined a question to give you a definitive answer. -- For direct replies, take out the contents between the hyphens. -Really!- "Jianhong Wang" wrote in message ... Thank your guys for all your answers. As scott mentioned, I want to the possible max power (dBm) a receiver can get no matter it works or not. I know it depends on a lot of things, like receiver antenna efficiency. But could you give me a empirical number assuming that reciever's antenna is most efficience in the thoery. Thanks (Scott Dorsey) wrote in message ... Bob Haberkost wrote: That question is a non-starter. A poorly-designed reciever will probably freeze up within a mile of a 50kW antenna, while a superb one could likely take several volts-per-Meter and not even squeal, even when within the tuning house or at the base of the tower.. I think his question is how many dBm would be received at the front end when sitting at the base of the tower. Not how many dBm can be received and still use the radio. --scott |
#12
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On Tue, 02 Mar 2004 15:58:39 +0000, Bob Haberkost wrote:
That question is a non-starter. A poorly-designed reciever will probably freeze up within a mile of a 50kW antenna, while a superb one could likely take several volts-per-Meter and not even squeal, even when within the tuning house or at the base of the tower.. Seems like the old Mod Monitors would take 10v. Usually from a tap in the final amplifer. Ron |
#13
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Well, exactly...sortof. I don't think the question is what was the maximum
that any "receiver" would take, as I also considered the various off-the-transmitter modulation monitors as the top end of that range. What he's clearly asking is how much RF any given receiver would be exposed to at close range. But how close? And with what antenna (what wavelength)? Series or parallel fed? Etc., etc. The question needs many more parameters to get a hard answer, and that hard answer is of no significance since the scenario isn't a real-world question. And the final indication that this is a non-question is the reference to dBm...for dB, one needs an impedance of the load. AM receiving antennas do not conform to an impedance, unlike FM and other VHF and up sets that usually use either 300 or 75-ohm feeds. With those one can take field strengths and convert them to power....without a corresponding impedance, the AM question is undefined. And in the interest of the truth (even for a purposeless question) I wouldn't presume to assume to specify an answer which has no basis in reality. -- For direct replies, take out the contents between the hyphens. -Really!- "Ron" wrote in message ... On Tue, 02 Mar 2004 15:58:39 +0000, Bob Haberkost wrote: That question is a non-starter. A poorly-designed reciever will probably freeze up within a mile of a 50kW antenna, while a superb one could likely take several volts-per-Meter and not even squeal, even when within the tuning house or at the base of the tower.. Seems like the old Mod Monitors would take 10v. Usually from a tap in the final amplifer. Ron |
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