[eagle] Re: New 70 cm Receiver Test Results

Juan Rivera juan-rivera at sbcglobal.net
Sat Jun 9 18:34:56 PDT 2007


John,

 

I've made more progress.  Rather than repeat it here please see the log.

 

73,

 

Juan

WA6HTP

  _____  

From: John B. Stephensen [mailto:kd6ozh at comcast.net] 
Sent: Saturday, June 09, 2007 6:15 PM
To: juan-rivera at sbcglobal.net; 'Robert McGwier'
Cc: eagle at amsat.org; 'David Smith'; 'Dave Black (Work)'; 'Dave Black
(Home)'; 'Samsonoff at 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 at sbcglobal.net>  Rivera 

To: 'Robert McGwier' <mailto:rwmcgwier at gmail.com>  ; 'John B.
<mailto:kd6ozh at comcast.net>  Stephensen' 

Cc: eagle at amsat.org ; 'David Smith' <mailto:w6te at msn.com>  ; 'Dave
<mailto:dblack at mail.arc.nasa.gov>  Black (Work)' ; 'Dave Black (Home)'
<mailto:dblack1054 at yahoo.com>  ; 'Samsonoff at Mac.
<mailto:'Samsonoff at Mac.%20Com'>  Com' ; 'Juan.Rivera (Work)'
<mailto:Juan.Rivera at 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

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