23
Cooling of the transceiver is provided by two fans. One
is located within the electronics unit and provides
forced air cooling of the whole transceiver. The second fan is
mounted on the front of the electronics unit and provides
cooling for the high power components in the 25kW
Modulator.
RF Head
24
The RF Head contains a 25kW magnetron, Circulator
and a Waveguide outlet.
25
The Low Noise Front End (LFNE), (CTX-A323), Diode
(pulse) Limiter and Filter Shim do not form part of the
RF Head, but functionally complete the RF path. The LFNE
(CTX-A323) comprises an RF Amplifier, Balance Mixer,
Local Oscillator and IF Head Amplifier.
An tenna Turn ing Mech a nism
26
A separate Antenna Turning Mechanism is required
for the Downmast Transceiver.
27
Two versions of the turning mechanism can be used
with the transceiver (CTX-A8)
(1) Low Speed (CAE-A30-6), which employs a 24V dc
motor and rotates the antenna at 24rpm. The
Transceiver power supply switch SW2 is set to ON
to provide a +26V output to the motor.
(2) High Speed (CAE-A30-5), which employs a 36V
brushless dc motor and rotates the antenna at
40rpm. The Transceiver power supply switch SW2
is set to OFF to provide the 36V dc output to the
motor.
28
Either version of the turning mechanism can be fitted
with 1.3m, 1.8m or 2.4m antennas.
May 01
7d.4
Original
KH 2020
Chap 7d
Содержание Kelvin Hughes Nucleus 3 5000 Series
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