Codan 8525B Series Technical & Service Manual

4-38 Technical Description 8525B/8528 Technical Service Manual
Issue 6 Publication No: 15-02036
4.14.3 L—Lower Sideband Operation
Individual channels can be programmed to operate on LSB in lieu of the
normally programmed USB. The LSB crystal must be fitted as for option
LU. The required facilities are programmed into the EPROM.
4.14.4 M—CW Facility
A 3.2mm jack socket can be fitted to the transceiver rear panel and
connected to pin 3 of P2 on the Microprocessor Controller PCB (08-02451).
This provides the connection for an external morse key.
4.14.5 PH—Headphone Output
A 6.4mm switched jack socket can be fitted to the transceiver front panel
and connected to the loudspeaker circuit as shown in 04-02453. This
provides the connection for a headset. Insertion of the jack in the socket
breaks the loudspeaker circuit, thus muting the loudspeaker. The headset
signal is attenuated slightly by a 330Ω resistor in the line, thus making it
unnecessary to adjust the volume when changing to or from headset
operation.
4.14.6 R—Extended/Remote Control Interface
A 15-way connector can be fitted on the transceiver rear panel to provide the
connections for an extended or remote control head to be used in addition to
the controls on the transceiver front panel. The connector is included in the
normal build standard of transceivers manufactured specially for remote or
extended control only. The circuit is described in Section 4.6.3.
4.14.7 AD—Antenna Driver
Option AD enables Type 8525B/8528 Series Transceivers to be used with
Codan Automatic Tuning Whip Antennas Type 8558 while still retaining
the capability of using antennas with preset tuning.
The option consists of a single PCB (Antenna Driver PCB Assembly
(08-04285). The PCB plugs into J202 on the Mother Board of the
transceiver after disconnecting the ribbon cable previously connected to this
plug. The ribbon cable, which carries the antenna control facility to J201 on
the rear panel of the transceiver, is then connected to a plug (P1) on the
Antenna Driver PCB. Two further connections are made: J2 of the Antenna
Driver PCB is connected to J1 of the Microprocessor Board and J3 of the
Antenna Driver PCB is connected to P4 on the PA and Filter Board.
(Refer to Circuit Diagram 04-02724)
The inclusion of the option is indicated to the microprocessor in the
transceiver when the IO device, IC3, on the board responds to being polled,
on the I
2
C bus to its Clock and Data lines, when the transceiver is switched
on.

Codan 8525B Series Specifications

General

Brand	Codan
Model	8525B Series
Category	Transceiver
Language	English