[eagle] Re: Latest 70 cm Receiver Test Results

John B. Stephensen kd6ozh at comcast.net
Sun Jun 10 12:50:49 PDT 2007


The time that I spent optimizing the layout of the U17 switching regulator appears to be worth it if it isn't polluting the VCOs. What would be ideal is a module case where the CAN bus can exit from one side and the RF and IF from the other.  

For now, the RF and IF can be run back to the connector bracket with SMA jumper cables. What is needed is a CAN-Do widget without the header connector so that wire leads can carry power and signals to the receiver PCB. 18-22 guage wire should work for power and 22-26 guage for signals. The wires need to be wound around a torroidal ferrite core to kill any common-mode noise. It may also be necessary to run the coax through ferrite beads. Do you have any beads or torroids made of material 75 or 77?

73,

John
KD6OZH
  ----- Original Message ----- 
  From: Juan Rivera 
  To: eagle at amsat.org 
  Sent: Sunday, June 10, 2007 17:59 UTC
  Subject: [eagle] Latest 70 cm Receiver Test Results


  All,

   

  As I troubleshoot the 70 cm receiver I stop and add to my logs every few minutes.  I won't bother to announce every step I take (I just made an addition) because it takes too long.  If you are interested please check the latest log at the top of the list or go to my web site.  If you have a comment or suggestion just drop me an email via this Eagle/AMSAT mailer and everyone can participate.  I'll check email often when I'm working on this project.

   

  Here's the link to the AMSAT/Eagle receiver page --> http://www.amsat.org/amsat-new/eagle/EaglePedia/index.php/U-Band_Receiver

  From there find the latest log at the top of the list under Project Status.  At the moment it's 'Spur Troubleshooting'

   

  Or...

   

  Go to my web at http://www.juanr.com/

  Select Amateur Radio, select AMSAT/Eagle, and select the log you want to see from the menu.

   

  73,

   

  Juan

  WA6HTP

   

   

   



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