[eagle] Passband Ripple - Latest Modifications and Test Results
juan-rivera at sbcglobal.net
Tue Aug 7 19:26:12 PDT 2007
Per your request I have modified the input coupling to the 2nd Mixer as
* Remove C37
* Replace L15 and L16 with 16 ohm resistors
* Install 0.27 µH inductors from pins 2 and 3 of U8 to ground
I then retested the IF passband ripple by sweeping a 1 MHz span centered on
10.7 MHz. The output level was reduced by 3 dB but there was no change in
the ripple. Click HERE
view my log.
I think we need to look outside of that coupling area since weve pretty
much replaced every component. Lets replace both SAW filters next. What
do you think?
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