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Ultra Low-Current Wireless Audio Discriminator
Installation Instructions
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The GFD-40W is a battery powered, ultra low current wireless
audio discriminator, sensitive to sounds above the cutoff
frequency of approximately 5 kHz. It is primarily designed to
detect the breakage of any type of glass. When activated by a
sound in the proper frequency range, the GFD-40W triggers a
plug-in, low power UHF transmitter module that sends a coded
alarm signal to the control panel.
The detection sensitivity can be adjusted with an on-board
RANGE control, so that an alarm would be triggered only in
response to sounds of sufficient amplitude. A jumper link on the
PC board is used for temporary activation of a DETECTOR LED,
which serves as a sound level monitor (see para. 3.5).
The transmitted RF signal consists of a SYSTEM code and a
CHANNEL code that perform the following functions:
•
The SYSTEM code serves as a password – the remote
receiver ignores RF signals other than the correctly coded
ones. A code match between the GFD-40W and the remote
receiver is obtained by selecting identical settings on an
8-position CODE switch in both units. It is possible to select
256 different system codes (see para. 3.3).
•
The CHANNEL code
determines which one of the
remote receiver's outputs
will be activated by the
transmitted RF signal. This
code is selected by
presetting the GFD-40W
4-position "CHANNEL"
selector (see para. 3.4).
Both detector and transmitter
are powered by an internal 9
Volt alkaline or lithium battery
housed within the unit's case.
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ACOUSTIC
Detection Range: Up to 35 ft (10 m)*.
Cutoff Frequency: 5 kHz nominal
Microphone: Electret condenser.
* Varies with room shape, acoustics, temperature and humidity.
ELECTRICAL
Battery: 9-volt alkaline or lithium type.
Current Drain: 0.008 mA in standby.
Battery Life: Up to 2 years in standby; calculation is based on
initial full battery capacity of 0.5 Ah and operating conditions
within the limits of battery specifications.
Note: Although the battery should last 1 - 2 years, it is a good
practice to replace it every 12 months.
Visual Indicators:
ALARM LED - lights upon alarm.
DET. LED - indicates detection of ambient noise.
Testing: Built-in LED for ambient noise monitoring.
WIRELESS
Frequency (MHz): 315, 304, 404, 418, 433.92 or other
frequencies per local requirements.
Transmission Duration: 2 seconds
System Code: 8-bit digital word, 256 combinations, pulse width
modulation.
Channels: 4 channels, switch-selectable.
ENVIRONMENTAL
Operating Temperatures: 0°C to 50°C (32°F to 122°F).
Storage Temperatures: –20°C to 60°C (-4°F to 140°F).
PHYSICAL
Dimensions (H x W x D): 110x63x25mm (4-5/16 x 2-1/2 x 1 in.).
Weight: 67 gr ( approx. 2-1/2 oz).
Color: White.
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The GFD-40W should be positioned close to and facing toward
the expected forced entry points (door, windows etc.). It is
inadvisable to mount the unit on the wall through which intrusion
could occur.
There should be a clear acoustic path between the unit and the
protected area. Do not mount the unit behind walls or around
corners from the area to be covered, as the signal it receives will
be reduced. Any coverings or decorations (drapes, blinds etc.)
should be in place and taken into consideration during
adjustment.
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The detector unit is suitable for surface mounting, using the
mounting knockouts provided in the base (see Figure 1).
A. Unpack the GFD-40W and save the nylon bag with the round
plastic cap for later use (see para. 3.7).
B. Remove the screw which secures the front cover to the case.
C. Punch out two diagonally opposed mounting knockouts (see
Figure 1 for knockout locations).
Figure 1. Inside View
