Codan 9105 / X2


General Specifications

Frequency Range 2 to 18 MHz.

Channel Capacity 10 channels. Any combination of single or dual

frequency simplex.

Frequency Generation Frequency synthesiser with 10 Hz resolution:

controlled by plug-in EEPROM.

Operating Modes Single sideband (J3E).

Programmable USB, LSB or front panel


Frequency Stability USB: 2(3)ppm

LSB: (2(3)ppm +10 Hz) }-10C to +60C

Long term ageing 1ppm per year.

Crystal reference oven warm up time 1 minute.

Programming Frequencies and options are programmed via the

microphone socket and 3-wire RS232 interface

using XP programming software and an IBM

compatible PC.

Cloning Channel frequencies and options can be copied

from one transceiver to another via the

microphone socket.

Controls Power ON/OFF and Volume.

Channel select.



Mute ON/OFF/Tune.

Emergency Call: RFDS 880/1320 Hz. (Australia


Indicators Power On/Transmit.





RF - UHF connectors: Qty 2 (programmable).

Antenna Control.

Extension Loudspeaker.

RF Input/Output


50 W nominal.

Supply Voltage 12 V DC nominal, negative earth.

Normal operating range 10.5 to 15 V.

Maximum operating range 9 to 16 V approx.

Reverse polarity protection.

Supply Current Receive : no signal 360 mA.

Transmit: refer to Transmit Specifications.

Environment Ambient Temp.

-10C to +30C

+30C to +60C

Relative Humidity


From 95% at +30C to

30% at +60C

Derate upper ambient temperature by 1C per

330 m above sea level.

Cooling Convection.

Size and Weight Transceiver only:

230 mm W x 75 mm H x 290 mm D 2.5 kg

With mounting cradle:

250 mm W x 90 mm H x 290 mm D 3.0 kg

Depth measurements include rear




Receiver Specifications

Type Dual conversion, superheterodyne.

IF Frequencies 45 MHz and 455 kHz.

Sensitivity 0.3(0.4) mV PD -117(-115) dBm for 10 dB

SINAD with > 50 mW audio output.

Input Protection Will withstand 50 V RF from 50 W.

Selectivity Greater than 70(65) dB at -1 kHz and +4 kHz

reference SCF USB.

Pass Band -6(-8) dB 300 to 2700 Hz

Ripple 2(4) dB pp 500 to 2500 Hz

Desensitisation 10 dB SINAD reduced to 7 dB SINAD.

-1 and +4 kHz (ref SCF) 65(60) dB

10 kHz 85(80) dB

50 kHz 100(95) dB

Image Rejection Better than 90(80) dB.

Spurious Responses Better than 90(70) dB.

Self Generated Signals > 0.3 mV PD:

3652, 5478, 7304, 9130, 10956, 14608 kHz.

Cross Modulation A signal 85(80) dB above a signal producing

10 dB SINAD, modulated 30% and removed at

least 20 kHz from the wanted signal will

produce an increase in receiver noise of less than

3 dB.

Blocking As for desensitisation.

Intermodulation To produce a third order intermodulation

product equivalent to a wanted signal producing

10 dB SINAD, two unwanted signals greater

than 30 kHz removed from the wanted signal

must have a level greater than 82(80) dB above

the wanted signal. Third order intercept +7(4)

dBm, not affected by AGC.

AGC Less than 6 dB variation in output for input

variation between 1.5(2.5) mV and 100 mV PD.

Fast attack, slow release.

AF Power and


2.5 W into 8 W 5% THD

5.0 W into 4 W 5% THD

8.0 W into 2 W 5% THD.

Clarifier 50 Hz up to 5 MHz

10 ppm above 5 MHz

Clarifier is automatically reset to mid-frequency

with channel change.



PA Board-Thanks to Stuart Blackshaw



Transmitter Specifications

Type All solid state.

Power Output 100 W PEP 0.5 dB may be internally set to

any output between 125 and 25 W PEP.

CW or single tone approx. 60% of PEP.

(Average ALC control).

Duty Cycle 100% normal speech.

Supply Current 2-tone/CW 8 to 12 A

Average speech 6 A

Average speech for battery life calculations.

Protection Safe under all load conditions by limiting

reflected power to 10 W PEP and limiting PA

transistor collector voltage swing.

Thermal protection against excessive heatsink


AF Response Overall response of microphone and transmitter

rises approximately 6 dB/octave 300-2700 Hz.

Electrical input -6(8) dB, 300-2700 Hz.

Ripple 2(4) dB pp, 500-2500 Hz.

Spurious and

Harmonic Emissions

55(48) dB below PEP.

Carrier Suppression 60(50) dB below PEP.

Unwanted Sideband 50(45) dB below PEP (400 Hz).

70(65) dB below PEP (1 kHz).


(2 tone test)

100 W 30(26) dB below each tone.

36(32) dB below PEP.

125 W 27(26) dB below each tone.

33(32) dB below PEP.

ALC A 10 dB increase in signal input above

compression threshold produces less than 0.5 dB

increase in power output.

Maximum ALC range greater than 30 dB.

ALC attack time approximately 1 ms.

Residual Noise 65(55) dB below PEP of selected channel.

Microphone Dynamic type with push-to-talk switch fitted in

the case.



Processor/IF Board- Thanks to Stuart Blackshaw