8525B/8528 Technical Service Manual General Information 1-3
Publication No: 15-02036 Issue 6
Oven warm-up
time
1 minute.
Controls Sealed membrane switches.
Indicators Refer to illustrations for details.
8525B: All indicators except Tx
automatically dimmed for low ambient
light levels.
8528: All indicators except Tx may be
manually dimmed by front panel controls
if required.
Transmit/Receive
Switching
Approximately 20ms using the Option
PS connection. Transmit/receive
frequencies may be separated by up to
1MHz.
Connectors RF—UHF connector
Extended/Local control (Option R)
required for Control Head operation or
remote control.
Antenna control
Extension Loudspeaker
External Selective Call (Option PS)
External Alarm (for Options SDE and
SDEM) and/or unswitched battery for
remote control (Option PP)
Note: Options PS and PP are mutually
exclusive.
RF Input/Output
Impedance
50 ohms nominal.
Supply Voltage 12V DC nominal, negative earth. Normal
operating range 10.5 to 15V DC.
Maximum operating range 9 to 16V DC.
Overvoltage
Protection
Shutdown at 16V DC (nominal) for
duration of overvoltage.
Supply Current 8525B: Receive, no signal 400–550mA
8528: Receive, no signal, display
illumination on: 400mA; off: 340mA
Transmit: see section 1.2.3
Environmental Ambient
Temperature
Relative Humidity
–30°C to +30°C 95%
+30°C to +60°C from 95% at +30°C
to 30% at +60°C
Derate upper ambient temperature by
1°C per 330m above sea level.
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