[eagle] Re: New 70 cm Receiver Test Results

Juan Rivera juan-rivera at sbcglobal.net
Sat Jun 9 15:25:13 PDT 2007


Jim,

 

Yes, I removed the input and output filters from that stage and I'm feeding
its load with an external power supply.

 

Juan

 

  _____  

From: Jim Sanford [mailto:wb4gcs at amsat.org] 
Sent: Saturday, June 09, 2007 3:04 PM
To: juan-rivera at sbcglobal.net
Cc: 'Robert McGwier'; 'John B. Stephensen'; 'David Smith'; 'Dave Black
(Work)'; 'Dave Black (Home)'; eagle at amsat.org; 'Samsonoff at Mac. Com';
'Juan.Rivera (Work)'
Subject: Re: [eagle] Re: New 70 cm Receiver Test Results

 

Juan::
Did you also DISABLE the switcher?  If not, it may still be making noise,
either radiated, or coupled through grounds as someone else has suggested.

Thanks for all the work on this.
73,
Jim

John:
Juan's reference to the data sheet generates a wild thought:  At your
convenience, could you produce a document consisting of links to the data
sheets on the active components?  We could then add that to the receiver
page on EaglePedia and have ONE entry point to all information on this
receiver.  Obviously not urgent. . . .

Thanks & 73,
Jim

Juan Rivera wrote:



Folks,

 

I've bypassed U17, the 10 volt step-down converter, in an effort to isolate
the cause of the spurs in the IF output.  I've also started a new log.  You
can jump there by clicking
<http://www.juanr.com/pages/hobbies/ham_radio/Eagle/Troubleshooting_Spurs.ht
m>  here, or go to the AMSAT 70 cm receiver page and click on Spur
Troubleshooting under Project Status.

 

73,

 

Juan

WA6HTP

 





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