John,
I've made more progress. Rather than repeat it here please see the log.
73,
Juan
WA6HTP
_____
From: John B. Stephensen [mailto:kd6ozh@comcast.net] Sent: Saturday, June 09, 2007 6:15 PM To: juan-rivera@sbcglobal.net; 'Robert McGwier' Cc: eagle@amsat.org; 'David Smith'; 'Dave Black (Work)'; 'Dave Black (Home)'; 'Samsonoff@Mac. Com'; 'Juan.Rivera (Work)' Subject: Re: [eagle] Re: New 70 cm Receiver Test Results
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 mailto:juan-rivera@sbcglobal.net Rivera
To: 'Robert McGwier' mailto:rwmcgwier@gmail.com ; 'John B. mailto:kd6ozh@comcast.net Stephensen'
Cc: eagle@amsat.org ; 'David Smith' mailto:w6te@msn.com ; 'Dave mailto:dblack@mail.arc.nasa.gov Black (Work)' ; 'Dave Black (Home)' mailto:dblack1054@yahoo.com ; 'Samsonoff@Mac. mailto:'Samsonoff@Mac.%20Com' Com' ; 'Juan.Rivera (Work)' mailto:Juan.Rivera@gd-ais.com
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 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