1. Codan 5700 Series C-Band Transceiver
The Codan 5700 series C-Band transceiver is a high performance, low cost satellite earth station. It is ideally suited to single or multi-carrier rural and remote area telephony and data communications. It is based on field-proven, high reliability (200,000 hr MTBF) microwave modules and is covered by a three year warranty.
The transceiver complies with major international standards for C-Band equipment. It provides exceptional multi-carrier performance, low transmit spurious signal levels and has very low transmit gain variation over the operating temperature range and very low power consumption.
Being fully sealed, the transceiver is ideally suited for operation in the world’s more remote and harsh environments and can be directly mounted on a wide range of earth station antennas.
Technical Overview

2. 5700 Series C-Band Transceiver Components
type 5700 Converter Module
SSPA types W W W W W W
5712H - 120W
LNA & TRF
type 5582 Power Supply Units
Up/Down Converter
The Converter uses synthesiser outputs from two phase locked loops to produce the required SHF LO. For a single synthesiser converter only one synthesiser is provided and it’s outputs are actively split to produce required Tx and Rx SHF LO’s. The frequency is set in 1MHz increments. The module also provides automatic gain versus temperature compensation. This feature is integrated with the SSPA module to provide excellent overall system compensation over a wide temperature range (-40oC to +55oC).
Solid State Power Amplifiers
The transceiver is available with either a 5W, 10W, 20W, 30W, 40W, 60W or 120W SSPA. All low power SSPA modules feature a single GaAs FET output power stage which provides high DC power efficiency and excellent multi-carrier intermodulation performance. The 60W and 120W SSPA’s use an advanced combining network to efficiently combine a number of modules to provide the required otput power with very low AC power consumption. The combination of low power consumption and high speed activation makes the transceiver ideal for solar powered systems.
LNA and TRF
The LNA and TRF are usually mounted directly on the antenna feed Rx port. The transceiver is designed to interface to LNAs that require power via either the LNA’s RF output connector or a separate power/alarm connector.
Mains Supply Module
The Mains Supply Module provides DC power to the transceiver from a 50/60Hz, 115/230V AC source. It contains a simple transformer/rectifier supply, with over current protection. The robust design of the module enables the transceiver to operate reliably in the presence of fluctuations in the mains supply.

3. C-Band Transceiver Block Diagram
LNA
SSPA
Up/Down Converter
Power Supply
AC Mains
Antenna
TRF
Transmit IF Input (70/140MHz)
OMT
Receive IF Output (70/140MHz)
Monitor & Control
Tx RF (6GHz)
Rx RF (4GHz)+ LNA Pwr
SSPA Pwr & Control
48V DC Power
This block diagram shows how the modules in the Codan C-Band low power (up to 40W) transceiver described in the previous slide are interconnected to form a complete outdoor mounting system. The higher power transceivers do not require a separate power supply as the SSPA accepts AC mains and powers the Up/ Down Converter.
The Up/Down Converter Module operates on 48V DC as does the low power SSPA. The LNA operates on 15V DC and its power is fed via the Rx RF coaxial cable.
Some antennas may have the TRF built into the antenna feed or OMT (Otho-Mode Transducer). An external TRF is not required on these antennas.

4. HPA Transceiver Block Diagram
LNA
SSPA
Up/Down Converter
AC Mains
Antenna
TRF
Transmit IF Input (70/140MHz)
OMT
Receive IF Output (70/140MHz)
Monitor & Control
Tx RF (6GHz)
Rx RF (4GHz)+ LNA Pwr
SSPA Control
48V DC Power

5. C-Band Converter Module
Not on CE converters
Converter Features
Transmit Path
- Tx IF impedance selection - Tx IF level adjustment - Cable compensation (not included on CE-marked converters) - Tx IF switch - Temperature compensation system (SSPA and Converter temperature sensors) - Dual conversion - Tx path amplifier shut-down when any PLL unlocked
Receive Path
- LNA power via RF cable facility - Dual conversion - Rx IF level adjustment - Rx IF impedance selection
Synthesizers
- All synthesizers locked to 10MHz reference - Dual or single synthesiser - SHF Oscillator shared between transmit and receive
Control/Power
- 48V DC for SSPA fed via Converter - Microprocessor control - SSPA fan powered & monitored from Converter

6. C-Band Converter Module
Transmit Side
Receive Side

7. IF Paths Tx IF input attenuator Rx IF output attenuator
25dB typical range, 1 dB steps.
10dB gain from Tx IF input to Tx RF output of converter at attenuator setting of 0dB.
Rx IF output attenuator
45dB gain from Rx RF input to Rx IF output of converter at attenuator setting of 0dB.
Tx IF switch - controlled by:
Warm-up timer
Tx IF path - 25dB adjustment range (30dB adjustment on non-CE marked converters) - Gain specification is 10±2dB at minimum attenuation
Rx IF path
- 25dB adjustment range (30dB adjustment on non-CE marked converters) - Gain specification is 45±2dB at minimum attenuation
Tx IF switch
If the Timer Over-ride is OFF, the warm-up timer will keep the Tx IF switch off (i.e.. transmission will be inhibited) until the warm-up period expires. This period varies from 30 seconds through to 14 minutes depending on ambient temperature at switch on.
If the Timer Over-ride is ON, the Tx IF switch will be on (i.e.. transmit will be enabled) as soon as the transceiver is turned on. Note that when operating in this mode, transmissions may be off frequency until the reference oscillator has warmed up.
IF Impedance
Set by user to either 50Ohms or 75Ohms

8. Tx IF Path Cable Compensation No longer available with CE market converters
Provides up to 1.2dB boost (70 MHz) or 2.5dB boost (140MHz) in 16 steps
Suits over 120m (400ft) of low loss Belden 9913 coax
Ideal for DAMA systems - constant EIRP across entire IF band
Cable Compensation (not in CE-marked converters)
The cable compensation system will typically flatten the frequency response of the transmit IF cable to within ±0.2dB over the 70 or 140MHz IF bands. It also automatically compensates for most of the cable loss. Refer to Table 5.9/5.10, “Cable compensation settings” in the User Manual for full details on the types and lengths of cables that can be compensated.
If you are using a cable not listed in the table, refer to the manufacturer’s data for your cable to locate the cable which is closest in performance to your cable and simply use that column in the table. For reference, the typical performance (loss) figures (at 100MHz) for the cables listed in the manual, are:
RG58A/U, RG223/U: 15.8dB/100m RG8A/U: 6.2dB/100m
Andrew FSJ1-50A: 5.9dB/100m Belden 9913: 4.6dB/100m

9. Tx IF Path Temperature Compensation
Compensates for gain variations of SSPA and Converter
Selectable for 5W, 10W or higher SSPA’s (via SPT5, 6 or 7)
±1.0dB level stability over -40oC to +55oC
Look-up tables in EPROM
Uses temperature sensors in SSPA and Converter
Temperature Compensation
Temperature compensation is set using the RS232/RS422 interface, if you have a 5W SSPA (SPT4), for a 10W SSPA (SPT5) and for a 20W/ 30W or 40W SSPA (SPT6). User defined fields are factory set utilizing temperature v gain coefficients and labeling data provided be the customer.

10. Synthesisers All oscillators locked to 10MHz oven controlled reference
10MHz Reference Warm-up timer
5-14 minute warm-up from cold switch-on (14 mins. at -40C !)
30 second warm-up if power interrupted momentarily
Timer Over-ride
RS232 (SRO1)
Allows transmission immediately from switch-on
Warm-Up LED flashes
Beware frequency accuracy!
SHF oscillator signals: Up and Down paths
Fixed 2225 MHz offset for single synthesiser models only
Step size 1MHz in both single & dual synthesiser models
10MHz Reference Oscillator
All synthesizers are phase locked to the 10MHz reference for best frequency accuracy.
The reference oscillator is oven controlled for high frequency stability. Since the oven takes time to warm up when first switched on, the reference oscillator will be slightly off frequency initially. For this reason, the warm-up timer inhibits transmission until the oscillator is on frequency. This error is normally only of concern for narrow channel spacing or low rate carriers (e.g.. SCPC companded FM or digital carriers at or below about 128kbps). For other applications, either the initial frequency error can be tolerated by the modems or the error will not cause interference to other carriers using the transponder. In these cases, the Timer Override facility can be used to allow transmission immediately from power on.
Warm-up from cold can take up to 14 minutes, however at normal room temperatures the warm-up time will only be 5-10 minutes.
If the 5700 has been operating for some time and there is a short power interruption, the oscillator oven will remain warm and transmission will be re-enabled after only 30 seconds or so after power is reconnected.

11. LNA Connections LNA power source is DIP switch Selectable (LNA+15V)
LNA Power via Rx RF input
LNA alarm and voltage shut down if >250mA
LNA alarm if <50mA or short circuited
Take care when testing at this input (turn off DC or use DC block)
LNA Power via separate connector
Current limited (max 400 mA)
LNA alarm relay contact input
LNA Power via Rx RF Input
To provide an LNA fault indication when the LNA is powered via the Rx RF input, the LNA current is monitored in the Converter. If the current is less than 50mA or greater than 250mA, an LNA fault is indicated on the LNA FAULT LED.
Take care when connecting signal generators to the Rx RF input during Converter testing. Either turn off LNA+15V switch to remove the 15V DC power from this connector or use a DC Block (eg. California Amplifier model C40100). The 15V LNA supply is shutdown if current in excess of 250mA is drawn, but it is still wise to take care when connecting sensitive and expensive test equipment.
LNA Power via LNA Power/Alarm Connector
The maximum LNA supply current drawn from the LNA power/alarm connector must be less than 0.4A in order not to overload the internal regulator. Take care when wiring this connector as the DC supply provided at this point is not current limited and over 3A can flow under short circuit or fault conditions.
An input is also provided for a form ‘A’ alarm relay contact (single relay contact closure to ground, open on fault). Refer to the User Manual, Figure 5.7 for the pin connections on this connector.

12. SSPA Connections Low Power SSPA Interface High Power SSPA Interface
48V DC - via fuse in Converter
SSPA temperature sensor for gain compensation
SSPA Fail
SSPA over temperature alarm
Fan Supply (+12V)
High Power SSPA Interface
110/220V AC Mains Input
48V DC to Converter
Fan Supply
Converter monitors current from fan to detect fan fault
Fault monitoring can be disabled (SFE0) for SSPA’s without a fan
Not available with high power SSPAs (self-monitoring by SSPA)
All the low power SSPAs operate from 48V DC fed via the Converter. This supply is fused by the main Converter supply fuse (accessible behind the front access cover) and is fully floating and not connected to earth (chassis) of the SSPA or Converter. All high power SSPAs operate from 110/220V AC mains and feed 48V DC to the Converter.
The temperature sensor for low power SSPA’s provides an indication of the SSPA case temperature to the Converter temperature compensation circuit, this ensures the RF ouput level does not vary any more than ±1dB over temperature variations.
The SSPA Fail and SSPA Temperature Fault alarms are signaled by open collector transistors in the SSPA. The appropriate transistor is turned off if a fault occurs, providing fail-safe alarm signaling. If you disconnect the SSPA from the Converter, both the SSPA and Temperature fault conditions are indicated on the Converter and Interface Unit fault LED’s.
The +12V DC fan supply in the low power SSPAs is provided by the internal power supply in the Converter and is referenced to ground (chassis). Fans are powered by an internal power supply inside the High-power SSPA. Fan faults in low power SSPAs are detected by monitoring the current drawn by the fan. If the fan current measured is below 200mA or above 600mA a fan fault is indicated. In High Power SSPAs fan faults are detected within the SSPA only and not relayed to the converter. The fan fault setting in the converter must be disabled in high power configurations or a FAN fault will be indicated.

13. SSPA Block Diagram
FAN
FROM CONVERTER
TEMP. SENSOR
TEMP. FAULT
SUPPLY FAULT
SSPA ACTIVATE
DC IN
SUPPLY AND LOGIC
SWITCHED MODE
SENSOR
TEMP.
OVER
OVER TEMP.
UNDERVOLTAGE
OVERCURRENT
-3V2
6V5 SWITCHED
10V SWITCHED
10V3
VOLTAGE
UNDER
5V1
6V5
OUTPUT BIAS
FAULT DETECTION
NEGATIVE RAIL GENERATOR
INPUT BIAS
RF INPUT
The SSPA block diagram shown above is “generic”. The differences between the 5W, 10W, 20W, 30W and 40W versions are minor and are mainly related to the output GaAs FET stages.
Main Features:
N-connector or Waveguide output versions
Input isolator for good input VSWR
Internal output isolator for output GaAs FET protection and good output VSWR
Single output GaAs FET for low intermods and low power consumption
Operates from 48V DC (fully floating)
All bias supplies are generated internally
Fan supply provided separately by Converter Module (10,20,30W,40W SSPA’s)
5W SSPA’s are convection cooled - no fan
Two temperature sensors: over temperature detection and gain compensation
Separate fault outputs for: - Fault in GaAs FET bias conditions - Excessive case temperature
SSPA Activate input is fast acting (<10ms)

14. Low Power SSPA (1) N-connector or Waveguide output options
Internal input isolator for good input VSWR
Internal output isolator for protection and good O/P VSWR
High system gain: 74dB (10W to 40W SSPA’s) nominal
Operates from 48V DC (fully floating)
All bias supplies are generated internally
Fan supply provided separately by Converter Module
Internal fault monitoring of GaAs FET bias conditions
Automatic shut-down if:
Bias fault detected when SSPA on - needs to be manually reset
SSPA case temperature is >75oC, automatically resets when SSPA cools down
The SSPA output power is rated at 1dB gain compression (not saturation) and is guaranteed. The ratings are:
5W SSPA: +37dBm 10W SSPA: +40dBm
20W SSPA: +43dBm
30W SSPA: +44.8dBm
40W SSPA: +46dBm
The SSPA’s are available in either coaxial (‘N’ connector) or waveguide (WR137) output versions.
An output isolator provides good output VSWR and protects the output GaAs FET in the event of a poor load VSWR. The isolator dissipation rating is higher than the SSPA output power and will withstand an output short or open circuit indefinitely.
For the protection of the expensive output GaAs FET’s, the SSPA is shut down if a bias fault occurs or if the case temperature becomes excessive.
The transceiver is unable to determine if the SSPA module is operating correctly unless it is activated. If a bias fault is detected after activation, the SSPA module is internally inhibited and the SSPA Fault LED comes on. The SSPA Fault LED will remain on until you rectify the problem and reset the SSPA fault (by momentarily selecting SSPA Inhibit or momentarily turning the transceiver to Stand-by mode).
An SSPA over temperature fault will only occur when the SSPA is activated (i.e.. when it is dissipating power), however this fault cannot be reset manually and will continue to be indicated even if the SSPA is inhibited. When the SSPA module cools down, this fault resets itself and the SSPA module will be automatically re-activated (provided SSPA Activate is selected and the SSPA is not inhibited).

15. Low Power SSPA (2) Two temperature sensors:
Over Temperature shut-down
Gain v Temperature compensation (in Converter) High MTBF fan standard on10W, 20W, 30W and 40W SSPA’s
5W SSPA’s are convection cooled - no fan
Maintenance
Check heatsink fins for obstructions (webs, nests, insects etc.)
Clean heatsink to remove dust, dirt, grime etc.
Recommendation - check at least once per year
The fans used on the 10W, 20W 30W and 40W SSPA’s have a high MTBF (the manufacturer specifies 70,000 hours at 40oC) but field experience has proven the MTBF to be many times greater than this in practice.
In the event of a fan fault or an airflow blockage, the SSPA will continue to operate until an over temperature shut down occurs. The SSPA will turn on again when the SSPA case cools down. This allows the earth station to continue to provide some level of service under fault conditions. Long term operation in this mode is not recommended as FET life and performance degradation can occur with continued operation at high temperatures.
For convection cooled SSPA’s (5W SSPA) in particular, the cooling efficiency of the heatsink can be degraded if the heatsink airflow is obstructed (eg. by spider webs, wasp nests etc.) or the heatsink becomes excessively coated with grime or atmospheric fallout.
For both fan cooled and convection cooled SSPA’s, the heatsink should be regularly checked (eg. once per year, more often in dusty or high pollution areas - field experience is the best guide) and cleaned if necessary.

16. High Power SSPA Available in 60W and 120W Completely sealed assembly
WR137 waveguide output
Internal Temperature compensation
Full monitor & control from 5700 Up/Down Converter
DC power supplied to the Up/Down Converter from SSPA
SSPA’s can also be operated in a stand alone configuration via front panel controls or serial commands
The 60W and 120W SSPA’s are only available with waveguide output flanges due to the high power.
As a transceiver the high power SSPAs supply regulated 48V DC power to the Converter. For this reason the converter MAINS/ BATTERY dip switch MUST BE SET TO BATTERY or the converter will not power up.
Unlike the lower powered Codan SSPA’s the 60W and 120W have internal temperature compensation circuitry, therefore the 5700 converters SSPA temperature compensation must be turned off to ensure correct temperature compensation over the full temperature range.
Fan faults are internally monitored by the high power SSPAs and will not show a fan fault on the converter module. To avoid a Fan fault being displayed on the front panel of the converter disable the Fan fault monitoring via the serial interface of the converter.
The 60W and 120W SSPA’s are also able to be used in a stand alone configuration. Codan supplied, Windows based software allows the configuration of the SSPA parameters such as attenuation settings, muting (inhibit), activation etc. The stand alone SSPA’s are also available in a 1:1 configuration.

17. 5582 Mains Power Supply
Switch Selectable operation from 115V AC or 230V AC %/+20%
Transceiver uses wide input range DC-DC converters
Provide low power consumption
High efficiency over full 37V to 76V range
Simple design ensures high reliability.
toroidal power transformer and bridge rectifier combination
The type 5582B Power Supply Units are reliable, robust units designed to provide nominal 48V DC from the available AC mains. They feature a wide AC input voltage range and low power dissipation. These power supply units are based on a toroidal power transformer and bridge rectifier combination rather than a direct mains-input switch-mode system to provide high reliability in the presence of mains transients and fluctuations often experienced at remote sites.
The power supply DC output voltage varies with the AC input voltage from appprox 37V DC output at nominal mains less 15% (98V AC or 196V AC) to 76V DC nominal mains plus 20% (138V AC or 276 AC). Both the Converter and SSPA’s use wide input voltage range DC-DC converters which provide high efficiency over the entire 37V to 76V DC input range.
The 5582 can supply up to 300W of DC power.

18. Transceiver Controls Power SSPA DIP Switches Off - All circuits off
Stand-by - Only reference oscillator and microprocessor on
On - Operational mode
SSPA
Inhibit
SSPA cannot be turned on remotely (Serial or Control Input)
Remote
SSPA on only if turned on remotely (Serial or Control Input)
Activate
SSPA on unless inhibited remotely (Serial or Control Input)
DIP Switches
Power Control
When the transceiver POWER switch is in the OFF position, all internal circuits are off and RS232/RS422 operation is not possible.
In the STANDBY position, the microprocessor and the reference oscillator are powered, allowing RS232/RS422 operation and the reference oscillator oven to warm-up. If Timer Override is selected, the WARM-UP LED will begin to flash for the duration of the warm-up time.
When the POWER switch is in the ON position, all Converter circuits are turned on and SSPA operation is allowed. Note that this mode can also be selected by RS232/RS422 command (System On - SSO1), by the opto-isolated “System On” input or by setting the type 5570 Remote Controller to ON.
SSPA Control
The SSPA may be inhibited from activation by: * the SSPA INHIBIT switch on the Converter module or the Remote Controller * the opto-isolated SSPA Inhibit input * an RS232/RS422 command (PA Inhibit - SPI1) * an SSPA fault or temperature fault
The SSPA module may be activated (provided it is not inhibited) by the following: * the SSPA ACTIVATE switch on the Converter module or the Remote Controller * the opto-isolated Req SSPA activate input * an RS232/RS422 command (PA Activate - SPA1)
Note: For CE-compliant operation, the new power up command (SPU1) will ensure the converterdoes not activate the SSPA after power interruption, unless SPA1 is re-sent or the front panel switch is set to activate, or the opto-isolated Req SSPA activate is asserted
Note: A fan fault does not inhibit activation of the SSPA module, however an over temperature condition or SSPA fault does inhibit activation. The over temperature fault resets itself automatically, but the SSPA fault must be reset manually.

19. Front Panel Indicators
Power
Stand-by - Only reference oscillator and microprocessor on
On - Operational mode
Warm-Up - In warm-up mode, flashes if Timer Override selected
SSPA
SSPA On - SSPA on!
Fault
Conv
One or more phase locked loops in the Converter are unlocked
LNA
LNA fault detected (current sense at Rx RF input or fault input)
SSPA fault (only detected when SSPA is activated)
Temp
SSPA case temperature too high
Fan
Fan not operating or too slow (low power transceivers only)
When you switch the transceiver from OFF to Stand-by mode, there will be no faults indicated. When you switch the transceiver to the operating mode (ON) the Converter, LNA, SSPA, Temperature and Fan fault LEDs indicate the status of these items. Note that the SSPA and Fan fault LEDs continue to indicate a fault until they are reset. When you switch the transceiver from ON to Stand-by, the fault LEDs will indicate the faults that were present prior to switching to the stand-by mode.
Indicator Color Description
STAND-BY yellow indicates that the transceiver is in the stand-by mode.
ON green indicates the transceiver is in the operating mode.
WARM-UP yellow indicates the transceiver is in warm-up mode (flashes if the warm-up timer is overridden).
SSPA ON yellow indicates the SSPA module is activated.
CONV red indicates one or more Converter module PLL’s are unlocked.
LNA red indicates the Low Noise Amplifier has failed.
SSPA red indicates the Solid State Power Amplifier module has failed to operate after activation.
TEMP red indicates the SSPA module has exceeded the maximum operating case temperature.
FAN red indicates the SSPA cooling fan is not operating (low power SSPAs only)