8525B/8528 Technical Service Manual 1-1
Publication No: 15-02036 Issue 6
1 General Information
1.1 Introduction
The Type 8525B Series and 8528 Series transceivers feature synthesized
frequency generation and have sealed membrane controls. The two series
differ only in control and display facilities. All differences are in the front
panel and the controlling EPROM. All transceiver functions are controlled
by a central microprocessor, enabling facilities such as clarifier, emergency
call, etc to be included as standard fit.
The 8525B comprises two versions: one for front panel control and one for
extended control. The extended control transceiver has a blank front panel
and is connected by up to 100 metres of cable to an 8530 control head. The
control head may also be used with the front control version allowing for
both local and extended control. Channel capacity of the 8525B is 99 single
or two-frequency simplex channels in EPROM, and channel display is by a
two-digit LED whose brightness is controlled by ambient illumination.
The 8528 series comprises two basic models: the land-based 8528 and the
marine 8528S. Two versions of each model are available: one for front
control and one for extended control. The extended control transceiver has a
blank front panel and is connected by up to 100 metres of cable to an 8532
or 8531S control head. The control head may also be used with the front
control version allowing for both local and extended control.
Channel capacity of the 8528 is 501 single or two frequency simplex
channels in EPROM and 99 channels in EEPROM. Transmit frequencies
may be front-panel entered by a qualified technician or where permitted, by
the operator. Receive frequencies may be entered by the operator.
The 8528 series has a twenty-digit liquid crystal display showing the
transmit and receive frequencies and channel number, or selective call send
and receive identification. Selective call addresses may be entered by
keypads on the 8528.
For transmission power in excess of 100W, the internal PA in the 8528S is
replaced by a PA driver and an external HF4000 series PA is used. The
external PAs are covered in a separate Technical Service Manual.
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