Taken with my previous post, just remember this about SWR and resonance.
Resonance is just the frequency where the inductive reactance cancels
the capacitive reactance, BUT, some of the total may not be from the
antenna alone. That can be seen where the SWR does not null at the same
frequency where reactance is zero. And some of that could be imbalance
in the SWR bridge measuring circuit. Items like Bird wattmeters are no
more accurate than 5 per cent generally, and
if SWR bridges are that good, feel lucky. There must be a reason you
generally don't see them rated for accuracy. For one thing they can be
frequency dependent, depending on quality of bridge construction.
Stuart
K5KVH
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