Transmit-Receive (Reciprocity) Trouble Shooting - impro HRR901 Installation Manual

External Antenna (HRR901-0-1-GB-XX)
This model is recommended when an installation calls for special antenna
considerations. This Impro Quad Receiver has its internal antenna bypassed and is
configured for direct connection to any of the various suitable antenna types available
(i.e.: high gain, Omni-directional, yogi etc.). An appropriate antenna must be selected
by the installer to complete the installation.
External Antenna Basic Requirements
Frequency ..............................
Impedance .............................
Connector ..............................

Transmit-Receive (Reciprocity) Trouble Shooting:

The Impro Quad Receiver has a built-in LED RSSI (Received Signal Strength Indicator)
bar graph. Before permanently mounting the Quad Receiver (or the external antenna
for HRR901) to a surface, it is recommended that the RSSI is checked with the
receiving antenna temporarily held in its proposed mounting position, and the Impro
Quad Transmitter at the expected point of entry or exit.
RSSI (Received Signal Strength Indication)
Strong ....... Installation is perfect, no need to change anything
Average ..... Installation is good enough for nominal operation
Weak ......... Consider installing the Quad Receiver in another location to
No Signal .. There is no reception at the current location. Refer to all of the
Figure 2: Radiation Pattern for the HRR900's integrated antenna
In Figure 2, the 3-D isometric radiation pattern (extreme right) is achieved with the
HRR900 Impro Quad Receiver mounted flat against the wall, right near the top, with the
internal antenna facing downwards. The green volume represents the direction of
maximum sensitivity.
HRR300-0-0-GB-01
improve operation
above installation considerations or check the installation for faults
433.92 MHz
50 Ω
SMA Male (Straight preferred)
April 2013 Page 4