Recently several of our customers have began asking for impedance 
     testing to be performed at various frequencies, from 200 Megahertz to 
     1 Gigahertz.  
     
     From what I have been told about TDR operation, the device works with 
     a carrier frequency of between 10 Megahertz and 20 Megahertz, and a 
     response frequency in the "X-band" of approx. 1.5 to 2 Gigahertz. 
     
     Can anyone shed some light on what TDR test frequencies are and how 
     they should be specified?
     
     Hal Brown
     Zycon Corp.
     [log in to unmask]
     (408)261-4019 voice
     (408)244-6349 fax.