From: g@crcomp.net   
      
   Liz Tuddenham wrote:   
   > Jeroen Belleman wrote:   
   >> Liz Tuddenham wrote:   
      
      
      
   >> > My VNA will also function as a TDR and I have a telephone-testing TDR   
   >> > for longer lines.  If all else fails, a square-wave signal generator and   
   >> > an oscilloscope will work too.   
   >> >   
   >>   
   >> Having used both VNAs and TDRs for cable length measurements, I've   
   >> always found the VNA measurements much superior to those of a   
   >> TDR. My HP8753 would resolve 1 degree @ 1GHz with ease. That   
   >> corresponds to a little under 3ps. TDRs are much too noisy to   
   >> do that.   
   > [...]   
   >   
   > My VNA is a relatively cheap hand-held device but it is good enought for   
   > the measurements I want to make and a lot better than the previous   
   > rule-of-thumb and guesswork method.   
      
   My VNA collection also includes a cheap hand-held device. Because ...   
   why not?   
       One of the hams in my club uses his VNA exclusively for SWR   
   measurements. So he simply skips Smith charting altogether.   
       On the other hand, it's all about the Smith chart for me. The VNA's   
   sort of a shortwave Swiss Army knife you can use as you see fit.   
      
   Your combo square-wave signal generator and oscilloscope as a TDR is   
   intriguing. Thank you for sharing.   
      
   --   
   73, Don, KB7RPU                                           veritas    _|_   
                                                             liberabit   |   
   https://www.qsl.net/kb7rpu                                vos         |   
      
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