Ken, I can't say what I'm about to relate is what happened to you, but it might be.
I had doubts about cable factors programmed into an EMI receiver; you can't GET -dB loss! So I had the test engineer repeat cable attenuation. It was not possible to get plausible numbers in the microwave ranges until all the coax that had been 1) bent too tightly, 2) stepped on or 3) caught in a chamber door, was replaced. Oh yes, the N connectors had to be properly assembled first. Above, oh, 6 GHz, even a slight crease was enough to introduce reflections that made things look funny. And yes, we had to use a small diameter semi rigid coax for the upper reaches. Cortland KA5S > [Original Message] > From: Ken Javor <ken.ja...@emccompliance.com> > [SNIP] > > The point of all this information is to show the controls that were in place > and see if anyone reading this can find any source of uncontrolled error > that would have been systematic, not random. The only thing I could think > of that was not perfect was the antennas were closer to the ground for the > high frequency portion of the testing then I would have liked and the cables > were not spec'd to 10 GHz. But I would think both of those would have > contributed errors that did not increase monotonically with increasing > frequency. > > Any suggestions? - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
