Product information Wireless data loggers
Transmitting range and repeaters
To increase the distance between the base unit and the data loggers, the
HD35RE...
repeaters are used. More repeaters in cascade can be used
(“multi-hop” network). Depending on the RF frequency band, the typical transmitting range between two devices in open field (
the range
could be reduced if there are obstacles between the devices
) is:
TAB. 2:
transmitting range
HD35AP / HD35APS
HD35APR / HD35APW
HD35AP3G… / HD35RE…
HD35APG…
HD35APD
868 MHz frequency band
HD35ED... with internal antenna
300 m
300 m
180 m
HD35ED... with external antenna / HD35RE...
>500 m
>500 m
180 m
902-928 MHz frequency band
HD35ED... with internal antenna
180 m
180 m
180 m
HD35ED... with external antenna / HD35RE...
>500 m
>500 m
180 m
915.9-929.7 MHz frequency band
HD35ED... with internal antenna
300 m
---
---
HD35ED... with external antenna / HD35RE...
>500 m
---
---
>500 m
>500 m
300/180 m
300/180 m
PC
USB
Database
HD35ED...
HD35ED...
HD35EDW...
HD35EDW...
HD35AP...
HD35RE...
The repeaters are available in two versions:
-
HD35RE
: in housing for indoor, with external power supply and rechargeable internal backup battery;
-
HD35REW
: in IP 67 waterproof housing, with internal not rechargeable battery.
HD35REW is a low power repeater designed for environments where the external power supply is not available. To preserve the battery
life, the use of HD35REW repeaters is recommended in systems with not a large number of devices and that do not transmit the meas-
urements frequently.
Designing the system it should be taken into account that between a HD35REW repeater and a HD35ED... data logger or between two
HD35REW repeaters, only HD35REW repeaters can be interposed (HD35REW does not act as repeater for HD35RE).
RF signal repeater
More repeaters in cascade can be used
16
