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using an HP 8405A to measure SWR ?
On Sun, 01 Jan 2006 03:25:23 GMT, Owen Duffy wrote:
On Sat, 31 Dec 2005 18:14:04 -0800, dansawyeror wrote: why the tee as described, doesn't the 8405A have a tee probe? Dan, my reason for this question is that you do not seem to have a load independent sample of the forward wave (if you are referencing measurements to the A probe). Ideally you would use a dual directional coupler, otherwise, you need to isolate the A sample from load impedance variations and reflections using a largish attenuator for example. If you are working the ratios out entirely from the B probe, eg B probe measurements on s/c and unknown load, then the A measurement becomes unimportant. Note that while this approach can give you enough info to measure rho and calculate SWR, it will not permit phase measurements. This approach dumbs the instrument down to a single channel RF voltmeter. Owen -- |
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