I.SITE III User Manual
© SWISSPHONE Wireless AG
Version 1.1
Page 9/20
3.4.2
Transmission Unit
The Tait TM8105 transmission module is approved for ETSI 300113, which makes it suitable for
local radio broadcasting. The transmitter is designed for digital data transmission. The modulation
method employed for this is DFSK (Direct Frequency Shift Keying).
The following four transmission units are available.
G
e
neral:
In order to avoid damaging the transmitter, ensure the following:
•
The prescribed power rating of 90-240VAC, 50-60Hz must never be exceeded.
•
The high frequency output must be connected at 50
Ω
.
•
Proper earthing and protection against lightning surges must be provided.
If an antenna is being used, we recommend to mount it several meters removed from the
transmitter to avoid feedback.
Note:
You can configure the output strength of the transmission module to suit your requirements.
Excess Temperature Protection:
When the operating mode is ‘Continuous Transmission’ and the environmental temperature is
above 55°C, the transmitter automatically reduces its output strength to a safe operating level.
3.4.3
Controller Board
The controller board handles communication via the Ethernet LAN interface, acting as a server for
external clients and accepting transmission requests. These requests trigger POCSAG
transmission via the transmission unit. Additionally, status and fault signals coming from the
transmission unit and the power supply are compiled and displayed on the controller board, as well
as being reported back via the Ethernet LAN interface.
The board is powered using a 3.3.VDC voltage regulator.
In order to provide more informative transmitter monitoring, every transmission is accompanied by
a range of status messages:
Status Information
SI01-3 (optional) Input I1 edge-triggered, potential-free 5-15V, debounced (open/closed)
SI04 (optional)
Service contact (door contact, open/closed)
SI05
Operating temperature in degrees Celsius, decimal two-digit
SI06
Fault status (when fault messages present)
Fault Status Messages
FS01
Unstable transmission frequency (PLL Unlocked)
FS02
Fault in transmission unit TX (High FWD/Low REV Power or TX Excess
Temperature)
FS03
No operating voltage present (AC Power Fail)
FS04 (optional)
Operating voltage of backup battery below threshold value (ACCU Low)
FS05
Incorrect transmitter keying (TX Not Allowed)
Frequency
Frequency
Transmission
strength
Channel spacing
Standard
VHF 4m
66-88MHz
1 to 25W
12.5/20/25kHz
ETSI 300113
VHF 2m
136-174MHz
1 to 25W
12.5/20/25kHz
ETSI 300113
UHF
400-470 MHz
1 to 25W
12.5/20/25kHz
ETSI 300113
UHF
450-530 MHz
1 to 25W
12.5/20/25kHz
ETSI 300113
