[TowerTalk] TDR recommendations?

[Rob]

Greetings,

Suggest an HP 3586 level meter.  You can cut lines to within a 1/4 of an inch for phasing 
accuracy.  

.. 73  Rob VE6TR


On Sat, 17 Mar 2007 21:19:08 -0700, Jim Lux wrote:

>At 08:11 PM 3/17/2007, Howard Klein wrote:
>>I'm looking for recomendations for least expensive but dependable TDR's
>>usable for antenna phasing. Any comments on the  Riser Bond 1205CXA or
>>Tecktronix 1503 both of which are available on Ebay in the $500 range or
>>other suggestions.
>>Howard..K2HK
>
>
>For phasing?
>So, say you want 10 degree accuracy at 30 MHz.. that's a time delay 
>of 33 ns/36 or about 1 ns precision.
>
>Might be easier to use an antenna analyzer, short the end of the 
>coax, and look for the dips.  A lot more precision at the expense of 
>a bit more time.
>
>Any sort of CW measurement (i.e. antenna analyzer, impedance bridge, 
>etc.) is going to have a much better SNR than a pulsed measurement, 
>and the inherent precision of the measurement will be better.
>
>A TDR is real nice if you're looking for bumps in the response from 
>bad connectors or crimps in the dielectric, and even then, these 
>days, a good vector impedance bridge and some software to turn the 
>frequency sweep into time domain would probably be a better way to do it. 
>
>
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