[eagle] Re: U-band receiver changes to reduce EMI and improve thermal regulation

Juan Rivera juan-rivera at sbcglobal.net
Sat Jun 30 15:51:07 PDT 2007



Thanks for sending that to me.  Have any prototypes been tested of the
converter?  I didn't see anything about the switching frequencies.  Where
will they fall?  Based on what you have, could an estimate be made as to the
level and characteristics of conducted EMI on the bus?  That could become
the basis for an EMI requirement for the payloads.  Then, if some reasonable
method can be devised to create that conducted EMI, we'll all be in a
position to test the payload designs against that EMI requirement, using the
test fixture. That would be a great thing!







From: Louis McFadin [mailto:w5did at amsat.org] 
Sent: Saturday, June 30, 2007 2:18 PM
To: juan-rivera at sbcglobal.net
Cc: 'John B. Stephensen'; 'Dave Black (Work)'; 'Dave Black (Home)'; 'David
Smith'; eagle at amsat.org; 'Samsonoff at Mac. Com'; 'Juan.Rivera (Work)'
Subject: Re: U-band receiver changes to reduce EMI and improve thermal


For a look at what is planned for the Eagle Power system, look at the
presentation I prepared for Dayton this year. You can see it at
"http://homepage.mac.com/w5did" Look in the w5did Eagle folder. The Max
Solar Converter is a preliminary document annd not to be published but it
describes the converter very well.



Lou McFadin


w5did at mac.com


On Jun 30, 2007, at 7:05 AM, Juan Rivera wrote:







Hi John,

I had a chat or two with Bob Davis about chassis and I think you can bring
SMA connectors out one side and the CAN-Do out the end, but nothing out the

Given the amount of conducted 5 kHz noise I'm seeing, do you think you can
filter it out?  Don't forget, I'm feeding the receiver with bypassed clean
DC from the bench supply at the moment.  The CAN-Do switched DC is nasty.

In your next version why not raise the switching frequency up and get it out
of the passband completely?  What do you think of Howard's idea of synching
the switching supplies?


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