[eagle] Re: New 70 cm Receiver Test Results

John B. Stephensen kd6ozh at comcast.net
Sat Jun 9 18:14:35 PDT 2007


The 68 kHz spacing indicates that the source isn't the PLL as it's phase detector operates at 125 kHz. The switching regulator on the CAN-Do module should be the only device that changes frequency with input voltage.

73,

John
KD6OZH
  ----- Original Message ----- 
  From: Juan Rivera 
  To: 'Robert McGwier' ; 'John B. Stephensen' 
  Cc: eagle at amsat.org ; 'David Smith' ; 'Dave Black (Work)' ; 'Dave Black (Home)' ; 'Samsonoff at Mac. Com' ; 'Juan.Rivera (Work)' 
  Sent: Saturday, June 09, 2007 20:25 UTC
  Subject: RE: [eagle] Re: New 70 cm Receiver Test Results


  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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