[amsat-bb] Re: Eagle Satellite Design

Bob McGwier n4hy at idaccr.org
Mon Sep 18 10:25:55 PDT 2006


AMSAT allowed a student to take on the construction of an S band 
amplifier as a senior design project (Steve Hendricks).  He submitted 
this S band amplifier design to a large competition in California.  It 
was an "efficiency" competition.   The student received honorable 
mention for several reasons:

A) He was the only undergraduate submitting  (he is taking the SDR 
course Brickle and I are offering now)
B) He came in fourth overall
C) His amplifier was at 2.4 GHz.  All other winners were around 1 GHz.
D) His amplifier was well above the minimum power output and used some 
very interesting GaN devices (very hard,  rad hard almost surely).

Steve Cripps was the chief judge and gave Hendricks the honorable 
mention and made quite a deal of his participation.


Hendricks is a senior at the College of New Jersey which has an 
excellent engineering program and currently employed part time at LTI 
(the company where K2UYH and N2UO "live and work").

John Stephensen, KD6OZH has done a design for the 70cm RX and has agreed 
to do any L band receiver work as well. 

Marc Franco, N2UO is doing our 2 meter amplifier design.

In all cases,  we are planning on polyphase HELAPS  (EER) to gain 
efficiency and with predistortion in DSP and sensors on the amplifiers.  
We should have excellent efficiency and very good IMD.

Best 73's

William Leijenaar wrote:
> Hi AMSATs,
> --Snip--
> "If there is sufficient folks and money to support
> such an independentw
> project, I would suggest hiring established
> transponder engineers to do theww
> actual design and construction...i.e someone known and
> respected by thew
> "Amsat family".  Afterall, such a module must satisfy
> all the spacecraft
> requirements and testing to qualify to be included and
> flown."
> What are the specifications for this s-band
> transponder ? Like: Power supply, RF power output,
> physical size, input IF etc... 
> w
> I will have a look what is possible...
> 73 de PE1RAH
> William Leijenaar
> ---
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Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540
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