What
does a high gain 3G Antenna do?
Provided
that you are within the 3G/HSDPA signal range a higher gain antenna
will provide you with higher data rates as your signal to noise ratio
is increased, thus a better transfer rate can be achieved.
A high gain antenna mounted outside in a fixed position will also
result in a more stable signal.
Please
bear in mind that the 3G/HSDPA data rate will also be affected by the
number of subscribers on line at a particular time, so you may have
great throughput in the mornings and late evenings and during the day
this may drop.
What
lightning protection should be used?
When
using the LPDA-A0021 there is a DC short built into the antenna which
will help with vicinity strikes, but the pole which the antenna is
mounted on must be properly grounded. This means that it must be
mounted on an aluminium pole with a copper strap running down the pole
into an appropriate spike (or 3 spikes) into moist soil. An additional
aluminium pipe can be mounted horizontally above the antenna to take
the brunt of any direct strikes.
Gas arrestors or polyphaser devices can also be fitted inline to further suppress any surges
What
is the difference between a YAGI and a LPDA?
A
yagi antenna typically can only cover 1 of the 3 cellphone bands
(900MHz/1800MHz or 3G, 1950-2170MHz). GPRS is transmitted on 900/1800
bands, 3G/HSDPA on the UMTS 2000MHz band. Very likely that yagi is not
made for the 3G band in which case it may actually REDUCE the signal at
3G and enhance GPRS. Best to use a broadband antenna such as an LPDA
(log-periodic dipole array). These antennas do all the bands and may
solve the problem.
Will the Antenna increase the 3G signal strength and reduce 'inactive' connection periods?
Regarding inactive periods the following (simplified) explanation: The base stations normally does power control. It operates on a contention basis and the better connected users will shut out those on the margin of the signal in peak periods. To reduce these inactive times a high gain antenna will definitely help, in the sense that the mast will interpret it as a better connection.
Cellular
antennas and your
health?
Antennas
do transmit and receive electromagnetic waves, they do not amplify the
signal they merely focus the signal. Using an antenna which is mounted
outside actually moves the radiation away from where people reside and
thus minimise any possible effects radiation could have. A Cellphone
used during a normal call, when placed against ones ear, exposes you to
far more radiation than an antenna a few meters away from you.
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