On Thu, 13 Dec 2001 "Bob Alexander" <realex@flash.net> writes:
>
> Hi Kim,
> It is not possible to get an accurate F/B measurement (or any kind
> of pattern measurement)from any rig that has the AGC turned on.
HUH? IF the S-meter is used as a fixed level indicator
in conjunction with a calibrated external step attenuator
there is no problem. N4KG (Receiver Design Engineer)
If you want to *hear* small differences, *then* you must
turn the AGC OFF.
> Also, the signal must be a constant carrier, not SSB. I am not
> familiar with the 756 but...
>
> If it has an IF output available, turn off the AGC and use a scope
> or RF voltmeter to measure the signal level as the antenna is
> switched from 0 to 180 degrees.
> The voltages can be used to calculate the F/B of the antenna.
This will work ONLY if you have sensitivity on the scope
to see the weakest signal. N4KG
> 73, Bob, W5AH
>
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