[eagle] Re: 70 cm Passband at -1 dB and -60 dB

Juan Rivera juan-rivera at sbcglobal.net
Sun Jul 22 07:37:48 PDT 2007



The component came in that I need to try John's last circuit change.  Once I
put this paper behind me I'll get them installed and see what happens.







From: Jim Sanford [mailto:wb4gcs at amsat.org] 
Sent: Sunday, July 22, 2007 4:23 AM
To: juan-rivera at sbcglobal.net
Cc: eagle at amsat.org; Bill Ress; Dave Black (Home); Dave Black (Work); Dave
hartzell; David Smith; Don Ferguson; Juan.Rivera (Work); Samsonoff at Mac. Com
Subject: Re: [eagle] 70 cm Passband at -1 dB and -60 dB


I have some thoughts on this (ripple), after some research I did late last
More later.

Juan Rivera wrote:



I re-ran the -1 dB passband test of the 70 cm receiver for my presentation.

Here's another look at a 500 kHz span at 0.5 dB/Div:






Here's a look at the -60 dB passband with a 2 MHz span and 5 dB/div.  I
increased the input

Level to get the skirts out of the noise.  It's 1.248 MHz wide at -60 dBc.




Juan - WA6HTP



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