Cecil Moore wrote:

Tam/WB2TT wrote:

"Galilea" wrote

When analysing wideband impulse signals from a wideband antenna I have
realised that the average signal magnitude is not zero. I have
thought this
is because the reactance of the antenna at different frequencies
varies and
since it is a wideband antenna there can be energy measured since it
is only
for an extremely small period of time of 2-4 us. However, I am not
sure and
would greatly appreciate the views of this newsgroup.

Are you saying the DC value is not 0 ?


He seems to be saying the DC value is not 0 for a sampling
time period of 2-4 uS which would of course be true for a
sine wave if, e.g., an odd number of positive cycles were
sampled along with an even number of negative cycles. Or
if the frequency was lower than 250 kHz. Plus all the
signals and noise are superposed.

Chances are fair that something is doing some rectifying somewhere.

ac6xg