[eagle] Re: Info on U-band receiver changes

Juan Rivera juan-rivera at sbcglobal.net
Sun Aug 19 20:03:34 PDT 2007


Why not put the new 10 MHz reference on the test PCB too?  We might as well
test as much as we can with that board.



-----Original Message-----
From: John B. Stephensen [mailto:kd6ozh at comcast.net] 
Sent: Sunday, August 19, 2007 5:34 PM
To: juan-rivera at sbcglobal.net; Bill Ress; Jim Sanford (wb4gcs); Dick Jannson
Cc: 'AMSAT Eagle'
Subject: Info on U-band receiver changes

I've posted the schematic and assembly drawing for the U-band receiver test 
fixture on the U-band receiver page in EaglePedia just above the receiver 
fabrication section. This PCB was made to test a way to tune the matching 
networks for the narrow-band SAW filters. I also added a new second mixer 
and IF amplifier so that changes to reduce thermal dissipation in revision B

of the receiver can be tested. Note that the average DC power consumed by 
first IF amplifier, second mixer and second IF amplifier drops from 870 mW 
to 370 mW. The circuit should exceed the specifications in the 
recently-revised U-band receiver requiremnts document.



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