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@amsat.org]
Sent: Saturday, June 09, 2007 3:04
PM
To: juan-rivera@sbcglobal.net
Cc: 'Robert McGwier'; 'John B.
Stephensen'; 'David Smith'; 'Dave Black (Work)'; 'Dave Black (Home)';
eagle@amsat.org; '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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