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Hydro Logger H1
User manual
FIEDLER
electronics for ecology
25
4.3.
Antenna and its location
The device with built-in GSM/GPRS communication module includes an an-
tenna. It is worth taking care to position the antenna well. With a better signal,
the current consumption of the device is significantly reduced. The unit can
communicate with lower transmit power, there is no connection dropout, no re-
peated connection attempts and the unit can enter power saving mode earlier.
When the unit is battery operated, it is recommended to always install the best
possible antenna to reduce energy consumption and extend the unit's operating
time, even for situations where the signal is above the critical threshold.
When installing the station, it is important to take care of the appropriate loca-
tion of the GSM antenna also from the point of view of its surroundings. Placing
the equipment, including the antenna, in enclosed concrete spaces or all-metal
cabinets rapidly reduces the characteristics and reception capabilities of the sig-
nal. In these cases, it is advisable to move the antenna out of the enclosure.
Reliable GPRS and SMS communication requires a GSM field strength at the an-
tenna location of at least 25% of the optimum required strength measured by
the unit during installation.
In case of lower signal strength, it may happen that some GPRS data sessions
will not take place at the set time, but only on other days with better conditions
for GSM signal propagation.
Antennas are typically supplied with an antenna coaxial cable of defined length.
This cable can be extended if necessary. However, with each metre of cable
there is signal attenuation, and it is recommended to use cables with low atte-
nuation per metre for extension.
OVERVIEW OF GSM ANTENNAS
Depending on the type of mechanical design of the H1 unit's housing, the station
is supplied with one of the following list of available GSM antennas with SMA-
M connector:
AGSM-3dB-SMA
AGSM-9dB-SMA
AGSM-1dB-SMA
AGSM-3dB/P-SMA
attachment: mag-
net
cable: 3m
Suitable for
wardrobe:
-A, -AZ, -AK,-S, -SZ
attachment: mag-
net
cable: 3.5m
Suitable for
wardrobe:
-S, -SZ
attachment: -
Cable.
Suitable for panel
mounting:
-P
Mounting: M12
cable: 3m
Suitable for
wardrobe:
-N, -NZ
B a t t e r y - p o w e r e d
u n i t s
E n c l o s e d s p a c e s
M i n i m u m G S M
f i e l d s t r e n g t h
A n t e n n a c a b l e
Содержание H1
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