About 2 years ago my company developed an OC-12 Telecommunications 
     option running at 622MHz for one of our products. During the prototype 
     debug cycle, the test engineers were having an extremely difficult 
     time getting the boards up and running and keeping them running. After 
     exhausting all means of inspection and touch-up to the solder joints 
     which failed to correct the problems, we decided to clean the "no 
     clean" residue off just for the hell of it. "Low and Behold" all the 
     problems disappeared. So, from our experience no clean paste residue 
     does act as a conductor at 622MHz.
     
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: Rf interference from No cleans (GEN/ASSY/DES)
Author:  [log in to unmask] at INTERNET
Date:    4/30/97 12:22 PM


Hello,
     
Does anyone have any information on the effect of no clean residues on RF.
I am interested at what frequency interference begins (if any) and what type 
of device you are talking about ie. phine, radio etc..  I am interested in 
both PCB and Hybrid Thick Film (alumnia) applications. Also, is anyone using 
no cleans in the Gigahertz level - if so what level?
     
Thanks 
     
Brian
     
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