Technical Description; Base Station Transceiver; Power Supply Section; Receiver Section - Raymarine RAY230E Owner's Handbook Manual

Technical Description

Section 4 TECHNICAL DESCRIPTION Section 4 TECHNICAL DESCRIPTION
Section 4 TECHNICAL DESCRIPTION
Section 4 TECHNICAL DESCRIPTION Section 4 TECHNICAL DESCRIPTION

4.1 Base Station Transceiver

4.1 4.1 Base Station Transceiver Base Station Transceiver Base Station Transceiver
4.1 4.1 Base Station Transceiver

4.1.1 Power Supply Section

4.1.1 Power Supply Section 4.1.1 Power Supply Section
4.1.1 Power Supply Section 4.1.1 Power Supply Section
This equipment is rated for 13.6 VDC but can operate within a voltage
range of 11.6 - 15.6 VDC. In case the input supply voltage exceeds 15.6
VDC, the over-voltage detection circuit (D18, Q27) cuts off the relay (RL1)
to the main power supply. Reverse connection of the power supply is
protected by a diode (D17) in the relay circuit.
Pressing the Power switch on the main unit turns on the power supply via
the relay circuit. This consists of Q26 on the main RF PCB, and Q301,
D301, and IC305 on the main control PCB and is switched by Q28, Q30,
Q33, and Q34). Only the CPU system is powered on. The RF circuit (Q29,
Q30 and Q331) remains off until the power switch is pressed on the handset.
At that time, the full system is operational.

4.1.2 Receiver Section

4.1.2 Receiver Section 4.1.2 Receiver Section
4.1.2 Receiver Section 4.1.2 Receiver Section
The RAY230/RAY230E is equipped with two receiver units: one for All
Channels and another exclusively for Channel 70.

4.1.2.1 Antenna Switching

4.1.2.1 Antenna Switching
4.1.2.1 Antenna Switching 4.1.2.1 Antenna Switching 4.1.2.1 Antenna Switching
The RF-signal passes through the low-pass filter to the RF pre-amplifier
(Q16) via the antenna switching action of D1 and D2. When receiving a
signal, diodes D1 and D2 are non-conductive.

4.1.2.2 Pre-amp, Splitter (binary distribution)

4.1.2.2 Pre-amp, Splitter (binary distribution) 4.1.2.2 Pre-amp, Splitter (binary distribution)
4.1.2.2 Pre-amp, Splitter (binary distribution) 4.1.2.2 Pre-amp, Splitter (binary distribution)
A bifilar wound distribution circuit (L37, R89) is furnished for the RF signal
because the radio is equipped with two built-in receivers (All Channels
and Channel 70). Since the pre-amplifier is used only to compensate for the
losses caused by this circuit, the amplifier is set at a low gain level. A
BALUN system assuring low losses is adopted for the distribution circuit.
4-1