radio , tv station and radar stations still use the best single end class a amplifier

single end · 28th August 2005, 02:32 PM

radio , tv station and air force radar stations still use the best single end class a amplifier.

edl · 28th August 2005, 09:13 PM

Where are you, Moderators?!

SY · 28th August 2005, 09:31 PM

Right here. It's strange, but it's not rule-breaking. Yet.

Yvesm · 28th August 2005, 09:41 PM

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.

amirmk · 28th August 2005, 10:36 PM

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.

Miles Prower · 29th August 2005, 04:18 AM

I don't care for spiced ham.

Alastair E · 29th August 2005, 05:15 PM

Quote:

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.............

ilimzn · 29th August 2005, 05:49 PM

Replace the cascode with a pentode and call it ultralinear

Miles Prower · 29th August 2005, 06:33 PM

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.)

amirmk · 29th August 2005, 08:23 PM

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.

28th August 2005, 09:31 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Right here. It's strange, but it's not rule-breaking. Yet. __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

29th August 2005, 04:18 AM	#6
Miles Prower diyAudio Member Join Date: May 2005 Location: USA Blog Entries: 2	I don't care for spiced ham. __________________ There are no foxes in atheistholes www.dolphin-hsl.com

29th August 2005, 06:33 PM	#9
Miles Prower diyAudio Member Join Date: May 2005 Location: USA Blog Entries: 2	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.) __________________ There are no foxes in atheistholes www.dolphin-hsl.com

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28th August 2005, 09:13 PM	#2
edl diyAudio Member Join Date: Oct 2004	Where are you, Moderators?!

28th August 2005, 09:41 PM	#4
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	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.

28th August 2005, 10:36 PM	#5
amirmk diyAudio Member Join Date: Nov 2004 Location: Israel	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.

29th August 2005, 05:49 PM	#8
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	Replace the cascode with a pentode and call it ultralinear

29th August 2005, 08:23 PM	#10
amirmk diyAudio Member Join Date: Nov 2004 Location: Israel	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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