>
>At 7:34 PM -0500 2000/11/27, Michael Tope wrote:
>>I'll have to go back and read part 97 again just to see exactly
>>what it says, but the way I figure it, there is nothing that says
>>you can't own a 10KW amp, only that you can run it on the
>>air at more than 1500 watts output.
>
>Sounds good to me. I am happy that my car is capable of going over 65 mph
>(or whatever the limit is). I'm happy that my amp is capable of putting
>out over 1500 W. I'm happy to have guns that are _capable_ of killing
>people, too. I don't believe in outlawing things just because somebody
>somewhere sometime might do something illegal with them.
>
>
>
>>Having a decent amount of headroom relative to 1500 watts in all the
>>antenna and matching components means that you'll be less likely to have
>>a failure when you inadvertantly load up your 1500 Watt amp on the wrong
>>antenna where VSWR effects can raise RF voltages and currents
>>to many times their matched levels....
>
>Agreed! I wish it were easy to buy a balun or an antenna tuner that
>wouldn't burn out at legal power but modestly high SWR. Last week the
>W2FMI balun that I bought from Amidon and that was advertised as a "5 kW
>balun" burned up when I put just 1.1 kW of forward power into it when the
>SWR was equal to 5. And we've all seen so-called "legal limit"
>antenna-tuners burn up on legal power.
>
A reason that baluns break down is that they are not designed to handle
reflected power.
To solve the problem, move the balun to where it sees no reflected power.
(see "The Balanced Balanced Antenna Tuner" January, 1989, QST).....
end
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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