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:[email protected]]
Sent: Saturday, June 09, 2007 3:04 PM
To: [email protected]
Cc: 'Robert McGwier'; 'John B. Stephensen'; 'David Smith'; 'Dave Black (Work)'; 'Dave Black (Home)'; [email protected]; 'Samsonoff@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 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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