I'm wondering if there's any equation or computer software which
compares the signal-to-noise ratio of two antennas under something
similar to the following scenario:
There is equal noise (eg static) coming from all azimuths and
elevations.
How does the signal-to-noise ratio compare when trying to receive
an additional signal coming from a single azimuth/elevation
which is on the main lobe of the antenna to another (or
isotropic) antenna?
Perhaps it would be something like comparing the root-sum-square
values that do NOT include the main lobe along with the gain
numbers(?).
I thought of this after seeing the pattern of two different antennas
with nearly identicle shape, just one 2 dB stronger in ALL directions.
Doesn't seem like the antenna with the gain would improve signal-to-
"noise picked up by the antenna" ratio on receive. A number like I
described would be useful in comparing two more diverse topband
receive antennas...
73, Bill K0HA
--
FAQ on WWW: http://www.contesting.com/topband.html
Submissions: topband@contesting.com
Administrative requests: topband-REQUEST@contesting.com
Problems: owner-topband@contesting.com
|