[SI-LIST] AW: Re: SMA cable for TDR

At a length of 3 feet phase stability over frequency and bending radius is a 
must to achieve consistency and repeatability. Shorter cables have more margin, 
thats why we use Port extender cables on our TEK to keep the coax cable short 
even though the TEK is 3 feet away from the DUT.

Aside from the connector and the manufacturer of the cable assembly the most 
important part for phase stability is the cable itself. My recommendations are 
Gore Phaseflex, H+S SUCOFLEX 400 (attention: only the brandnew 400 family ist 
phase stable over bending) and Silverline by Times Microwave. I'm sure there 
are also other cables, but I havn't worked with those.

BR
Gert


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Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im 
Auftrag von QU Perry
Gesendet: Dienstag, 28. Oktober 2008 22:16
An: steve weir; Zabinski, Patrick; Mark Randol; Chris Cheng
Cc: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: SMA cable for TDR

Thanks everyone for the suggestions on/off list. I had quite a few leads to 
pursue.

I'm not looking for super high bandwidth cable, but it needs to be better than 
the cheap blue semi-rigid cable I'm using now. It's a pain to try to find some 
matching cables (I have seen some terrible mismatch in delay and attenuation  
even though they all measured 3 feet). I'm also concerned about bend radius and 
the impact on measurement consistency.

Steve/Chris: I did search for Gore cable on Ebay and there are some nice cables 
out there, just did not find anything that suit my needs. :)

Pat: agree that good quality cable is important together with good calibration 
practice for model extraction purpose. I have seen the impact of these factors 
on my measurement results.

Mark: thanks for the 3.5mm suggestions. That's also recommended by Gore 
engineer. 

Regards

Perry

======================================= 

Perry Qu 

Design & Qualification, Alcatel-Lucent Canada Inc.

600 March Road, Ottawa ON, K2K 2E6, Canada 

DID: 613-7846720  Fax: 613-5993642 

Email: perry.qu@xxxxxxxxxxxxxxxxxx 

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