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Old 30th April 2011, 02:08 AM   #2731
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Default SiC semi's in UHF Radars

Quote:
Originally Posted by c2cthomas View Post
Ahhhh - another phased array puke!!
Google on "AN/FPS-85" or "PAVE PAWS" to see what we developed and modified...... We were exploring SiC technology to give the AN/FPS-85 what we called a "6 dB upgrade"--that's a 6 dB power aperture increase from it's current 32 megawatt (yep.....MEGAWATT) capability. (Do the math, on that one!)

Our semiconductors were developed by NASA (Glenn Research Center), Corning Glass, and internal to our company. They showed lots of promise, and performance. Unfortunately, that UHF radar upgrade program was never fully funded by U.S. Congress. All we had built were about 100 prototype modules. I'm betting you'll never see any of the SiC semi's we used hit the commerical market place, for a number of reasons....(!)
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Old 30th April 2011, 02:40 AM   #2732
49 - for the 18th time
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Our Ionospheric sounders were used for OTHB - once upon a time we did a lot of depot level support for da space mountain kids. When the base was shut down some of my guys transferred to Colorado Springs.
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Old 30th April 2011, 06:08 AM   #2733
Gyuri is offline Gyuri  Hungary
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Quote:
Originally Posted by Blues View Post
Very nice at -

Vgs=-4V
Ids=2A
Vds=~12V; guess what? mid-point for a 24V supply!
So if I understand it well, so Papa had to develop this thing, the Sit or Sic transistor, because his store is full of his otherwise unsalable 18V transformators.
As we said, there are so many of these things, that it can be build a dam on the Danube from them.
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Old 30th April 2011, 07:32 AM   #2734
Zen Mod is offline Zen Mod  Serbia
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if any of you ever stumble on one radar sit drek , please send it to me

I need proper device to made mono MC stage for my collection of 78s

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Old 30th April 2011, 09:36 AM   #2735
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How about nice (all-) SiT power amp.
(only $75 per stereo watt)
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Old 30th April 2011, 10:46 AM   #2736
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Maybe time to renew the old, famous logo ... (sit dog, sit)

Click the image to open in full size.

Last edited by PeterDupont; 30th April 2011 at 11:05 AM.
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Old 30th April 2011, 07:13 PM   #2737
Gyuri is offline Gyuri  Hungary
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Cats vs. dogs.

Lucky for me that one of my cats, (the four-legged one) is an audio expert.
He has helped me establish the fact, that the magnetic tape is threaded in incorrectly.

http://ugoxlw.bay.livefilestore.com/...1_1.JPG?psid=1

http://ugoxlw.bay.livefilestore.com/...1_1.JPG?psid=1
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File Type: jpg DSC_00340001.JPG (93.6 KB, 95 views)
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Last edited by Gyuri; 30th April 2011 at 07:21 PM.
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Old 30th April 2011, 07:38 PM   #2738
Blues is offline Blues  United States
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Quote:
Originally Posted by Gyuri View Post
So if I understand it well, so Papa had to develop this thing, the Sit or Sic transistor, because his store is full of his otherwise unsalable 18V transformators.
As we said, there are so many of these things, that it can be build a dam on the Danube from them.
I think our Papa had us DIYers in mind too...and also being a DIYer at heart to experiment with his concepts these are the magic numbers for all of us -else it gets too expensive.

Of course he also specified it to work just as well with higher values for his monster amp sensibilities...
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Old 30th April 2011, 07:52 PM   #2739
49 - for the 18th time
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Quote:
Originally Posted by Gyuri View Post
Cats vs. dogs.
Lucky for me that one of my cats, (the four-legged one) is an audio expert.
I'm guessing that other cat (not 4 legged) was not a victim of performing the same inspection of the tape machine????
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Old 1st May 2011, 08:39 AM   #2740
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Default Desmond Harrington

Here is one mystery uncovered.

Anyone who cares about industrial design, admires Pass Lab designs. All this years we questioned who did that awesome, unique and ground breaking design on Pass Lab amps. The circular 3D opening for the round bias instrument is Pass Lab trademark. I am sure that lucky owners are treating Nelson's amps like a sculpture displayed at the most prominent location. Rightfully so.

But, who is the one behind the design, we constantly asked. Mr. Desmond Harrington is the one responsible for such a design statement. Desmond worked for Krell, and in 90s he moved to Northern California to work with Nelson. The rest is history. I am glad that I could present to you Mr. Harrington, who would much rather me not publish this picture, but I just could not resist.
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