Many years ago I built a circuit which used op amps to make
diodes into "perfect rectifiers" -- rectifiers that would be
linear at very low voltages. Antenna analysers also have the
same problem. The real problem may be building a rectifier that
works at very low voltages when at low power and continues to
work at high voltages when at high power.
Cheers - Bill, AE6JV
sOn 12/12/13 at 6:21 PM, [email protected] (Don Wilhelm) wrote:
If all things are perfect, there would be no difference. But
in the practical, physical world, there are differences. In
the question you have posed, there is the wattmeter diodes to
consider. When the forward voltage is quite small, as would be
the case at lower power levels, there may not be enough
rectified voltage for a good indication of reverse power - that
will lead to erroneous results that may cause higher SWR
indications when the power is increased.
-----------------------------------------------------------------------
Bill Frantz |Security, like correctness, is| Periwinkle
(408)356-8506 |not an add-on feature. - Attr-| 16345
Englewood Ave
www.pwpconsult.com |ibuted to Andrew Tanenbaum | Los Gatos,
CA 95032
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