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Old 28th August 2005, 01:32 PM   #1
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Default radio , tv station and radar stations still use the best single end class a amplifier

radio , tv station and air force radar stations still use the best single end class a amplifier.
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Old 28th August 2005, 08:13 PM   #2
edl is offline edl  Hungary
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Where are you, Moderators?!
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Old 28th August 2005, 08:31 PM   #3
SY is offline SY  United States
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Right here. It's strange, but it's not rule-breaking. Yet.
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Old 28th August 2005, 08:41 PM   #4
Yvesm is offline Yvesm  France
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Oh, that is patented !

Change the cascode for a penthode and feed the screen from the tap on cathode divider.

But, it's perhaps already patented too !

Yves.
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Old 28th August 2005, 09:36 PM   #5
amirmk is offline amirmk  Israel
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You are wrong. Haven't used a tube for a radar in years, maybe twenty, and we are the most advanced in the world in that field. On the tight space you get on a fighter or a detachable device there is no room for such things.
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Old 29th August 2005, 03:18 AM   #6
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Old 29th August 2005, 04:15 PM   #7
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Default Magnetron??

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Originally posted by amirmk
You are wrong. Haven't used a tube for a radar in years, maybe twenty, and we are the most advanced in the world in that field. On the tight space you get on a fighter or a detachable device there is no room for such things.
Dont they use Magnetron Tubes in Radar anymore? Would have thought so!--Still the easiest way of getting say a kilowatt of microwave radiation, Fairly small, not including the PSU too.........

Local airport used Plessy Radar, with 8KW Magnetron--The tube wasnt physically very big either. Around the size of a large sweep-tube, with strong magnets either side.............
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Old 29th August 2005, 04:49 PM   #8
ilimzn is offline ilimzn  Croatia
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Replace the cascode with a pentode and call it ultralinear
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Old 29th August 2005, 05:33 PM   #9
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Replace the cascode with a pentode and call it ultralinear.

Seen this circuit lots of times, implemented with transistors: replace the two tubes on the right with a dual gate MOSFET (or a CA3028) the third tube with an emitter follower, and there you have it: solid state gain block. This is simply a sand-to-glass translation, and should not be patent-worthy. (Although these days, they patent the darndest things with total disregard for prior art.)
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Old 29th August 2005, 07:23 PM   #10
amirmk is offline amirmk  Israel
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Your local airport is behind our air force in about twenty years of technology, which is rather good compared to airports here.
What we've developed in the radar field you won't see in airports ever. Forget about giant revolving antennas, minimizing is the way to go right now.
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