[eagle] Re: 70 cm Receiver IF Spurs - Problem Solved

Juan Rivera juan-rivera at sbcglobal.net
Fri Jun 29 21:29:15 PDT 2007



Is there a sketch or block diagram of this proposed architecture that you
can share?





From: Louis McFadin [mailto:w5did at amsat.org] 
Sent: Friday, June 29, 2007 7:31 PM
To: juan-rivera at sbcglobal.net
Cc: AMSAT Eagle
Subject: Re: [eagle] Re: 70 cm Receiver IF Spurs - Problem Solved



I have been watching the correspondence about noise on the power buss with
great interest. I am waiting to see if a noise specification comes out of
this. I can tell you that the power buss will probably be noisy at least to
your standards. The latest plan would have lot's of capacitance on the buss
(many Farads) but of course that would not help with the high frequency
noise. I have been noting the discussion about noise from the inductors and
that will be taken into account in the design. In other words we will
probably shield all the inductors as best we can and have EMI shielded Power
converters. The plan calls for a distributed system where there will be many
small converters and not just one or two big ones. 


We plan to have many max power point converters mounted near the solar
panels and then many cell voltage to buss converters located where the
battery and super capacitors are placed. They are not planed to be
synchronized so the frequencies will vary based on load.

In other words modules should build in as much noise immunity as possible.


Lou McFadin


w5did at mac.com


On Jun 29, 2007, at 6:27 PM, Juan Rivera wrote:

I mistyped that last one. I meant, "Did you EVER receive a reply" not, "Did

you EVEN receive a reply."




-----Original Message-----

From: Lyle Johnson [mailto:kk7p at wavecable.com] 

Sent: Friday, June 29, 2007 3:15 PM

To: juan-rivera at sbcglobal.net

Cc: 'Chuck Green'; 'David Smith'; 'Dave Black (Work)'; 'Dave Black (Home)';

eagle at amsat.org; 'Samsonoff at Mac. Com'; 'Juan.Rivera (Work)'; Lyle Johnson

Subject: Re: [eagle] Re: 70 cm Receiver IF Spurs - Problem Solved


Hello Juan!


Did you receive a reply from Lou?


Not that I noticed, but when I was on the road the last several weeks 

it's possible something fell through the cracks. I would have expected 

it to come to the group, though.







Via the Eagle mailing list courtesy of AMSAT-NA

Eagle at amsat.org



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