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Old February 27th 05, 08:06 AM
John Woodgate
 
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I read in sci.electronics.design that Reg Edwards
wrote (in .
com) about 'Say what you mean.', on Sat, 26 Feb 2005:

The best I could do is ask what is the S22 of a 6J5. One thing for
certain, it is not mentioned in manufacturer's data sheets. Yet ARRL
simple PA design
rules manage very well without it.


You wouldn't expect to use scattering parameters for a 6J5. But change
that to 7194 and the question is not so facetious. (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
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Old February 27th 05, 06:08 PM
Ken Smith
 
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In article , Cecil Moore wrote:
Ken Smith wrote:
At the point where it fails, the output goes to zero, I assume. If so,
wouldn't that be the impedance as I've been defining it.


Is an amp that fails at one minute with 100w FM
better matched than an amp that fails at two minutes
with 100w CW?


No, you've got the concept backwards. Obviously the worst matched is the
1 o=minute case, next would be the 2 minute case and so on up to one which
runs for about its MTBF at the connected load. This last case would
likely be the one the designer was targeting.

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Old February 27th 05, 06:12 PM
Ken Smith
 
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In article ,
John Woodgate wrote:
[...]
If the FM is what passes for music these days, it's MUCH better IMHO.


There is very little that is sent in the form of radio waves that is worth
the electrical power to send it. The really sad thing is that much of
what is send via FM is really "voice grade" material. When FM was new,
the material for FM was specially produced to take advantage of the wide
bandwidth and large dynamic range.

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Old February 27th 05, 06:52 PM
Ken Smith
 
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In article ,
Jim Thompson wrote:
[....]

But I vaguely recall a 5/8 wavelength antenna that had a good
low-angle pattern.


Unfortunately, the OP (is he still here?) was stuck with a box to short to
even fit a 1/4 wave whip. I also think that this box could not be assumed
to be resting on the ground


If you squint at the ASCII art below, you will see more or less the
radiation pattern of a 5/8 whip over a large ground plain.
.................................
.................!...............
...........******!*****..........
..........*......!......*........
..........*......!......*........
...........****..!..****...A.....
........*******..!..*******......
.....***.........!.........***...
...*.............!.............*B
********************************

If you don't have a large enough ground plain, the notch in the side
labeled "A" starts to go away and the peak at "B" reduces.


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Old February 28th 05, 03:05 AM
 
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Still here, not quite sure who to believe, but enjoying the ride :-)

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Old February 28th 05, 03:15 AM
keith
 
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On Sun, 27 Feb 2005 17:12:46 +0000, Ken Smith wrote:

In article ,
John Woodgate wrote:
[...]
If the FM is what passes for music these days, it's MUCH better IMHO.


There is very little that is sent in the form of radio waves that is worth
the electrical power to send it.



Hmm, many advertisers would disagree. Since they have real money at stake
and you don't...

The really sad thing is that much of
what is send via FM is really "voice grade" material. When FM was new,
the material for FM was specially produced to take advantage of the wide
bandwidth and large dynamic range.


Bandwidth, perhaps. Wide dynamic range? The FCC rules seem to
suggest otherwise.

--
Keith

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