KMT TXS User manual

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
latest version of this instruction manual → txs_manual.pdf
latest version of the TXS datasheet → txs_datasheet.pdf
TXS INSTRUCTION MANUAL 0002 2015 specificationssubject to change without notice Page 1 (10)
Dimensions
76.2 x 50.8 x 20 mm
S
-BAND TELEMETRY TRANSMITTER
TXS
INSTRUCTION MANUAL
OUTLINE DRAWING
Mounting Hole
Ø 3.4 mm

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
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TXS INSTRUCTION MANUAL 0002 2015 specificationssubject to change without notice Page 2 (10)
INSTALLATION INSTRUCTION
The bottom surface must be securely attached to a baseplate capable of dissipating the power produced by
the device. This mounting baseplate must be flat, smooth, and clean.
Mounting Material
4x cylinder head hexagon screw stainless steel A2 DIN 912 M3x20
4x spring lock washer stainless steel A2 DIN 127 3mm
4x washer for cylinder head screws stainless steel A2 DIN 433 for M3
Cooling
VERY IMPORTANT !
► The device must be cooled adequately !
► The device must be mounted on a heat sink.
► A thermal compound between module and heat sink is obliged for low thermal contact resistance.
Recommended is the thermal interface sheet material Graftech HT-2505
datasheet → txs_cooling_material_hitherm.pdf
distributor → RS Components
► Heat sink flatness should be less than 100 μm
a heat sink that is not flat or particles between module and heat sink may cause too much mechanical
stress
► If you operate the device without adequate cooling the reliability will be drastically reduced.
Please do not underestimate the produced dissipation heat !
Antenna Connector
In most cases SMA connectors are applied with far too much torque. It is strongly recommended to use a
SMA torque wrench:→ fairviewmicrowave_torque_wrench.pdf

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
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TXS INSTRUCTION MANUAL 0002 2015 specificationssubject to change without notice Page 3 (10)
ISOLATION CONCEPT
There are 3 isolated areas:
(1) Power Supply Input
(2) System Controller & RF Modulator
(3) RF Amplifier (connected to case)
To prevent damage caused by ESD events overvoltage protection devices are connected between the iso-
lated areas. For this the voltage between the isolated areas must not exceed 47Volt.

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
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TXS INSTRUCTION MANUAL 0002 2015 specificationssubject to change without notice Page 4 (10)
MODULATION
ATTENUATORS:
There are two attenuators to adapt to different input voltages and to set
the desired FM deviation.
The input attenuator range is 14 db in steps of 2 dB.
The main attenuator range is 31.5 db in steps of 0.5 dB.
The modulation level calculator should be used to calculate the proper
attenuator settings: txs_modulation_calculator.xls
INPUT LEVEL RANGE:
For digital modulation set input attenuator to 2
PREMODULATION FILTER:
The main premodulation filter is a phase-linear 5th-order lowpass set to 10MHz in the "-10" version and
6MHz in the "-6" version. In the digital section there is an additional 5th-order Gaussian lowpass filter to
achieve perfect pulse shaping and sideband suppression.
Inp.Attenuator
Gain
min.InpVoltage
typ.InpVoltage
max.InpVoltage
dB
mVpp
mVpp
mVpp
0
0,795
1000
1258
3901
2
0,631
1258
1584
4911
*
4
0,501
1584
1995
6183
*
6
0,398
1995
2511
7784
*
8
0,316
2511
3161
10
0,251
3161
3980
12
0,200
3980
5010
*
14
0,159
5010
6307
*
* max. Input Voltage (single ended) =
4100 mVpp

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
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TXS INSTRUCTION MANUAL 0002 2015 specificationssubject to change without notice Page 5 (10)
POWER SUPPLY
SERIAL INTERFACE RS232 NONE-INVERTED TTL LEVEL
The power supply operating range is 10 Vdc to
36 Vdc. The power supply input is gavanically
isolated (floating) against all other parts of the
device.
To prevent excessive static voltages between
the different isolated areas of the device 48
Volt overvoltage protectors are connected
across the isolation barriers. So the maximum
voltage between the return levels of the differ-
ent isolated areas must not exceed 47 Volt.
The power supply input is reverse polarity pro-
tected up to -47 Vdc.
The none-inverting TTL level serial interface
can be directly connected to the UART port of
an external microcontroller, or via a TTL/USB
adaptor to any PC with USB connection.
An easy to use USB adaptor is available as
accessory.
The default UART setting is 57600,N,8,1.

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
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TXS INSTRUCTION MANUAL 0002 2015 specificationssubject to change without notice Page 6 (10)
MODULATION INPUT ANALOG SINGLE ENDED
MODULATION INPUT ANALOG DIFFERENTIAL
The single ended analog modulation mode is
the most commonly used input type for video
transmitters.
The analog differential input can be used with
twisted pair cable connection or if maximum
signal-to-noise ratio is requested.

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
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TXS INSTRUCTION MANUAL 0002 2015 specificationssubject to change without notice Page 7 (10)
MODULATION INPUT ANALOG SINGLE ENDED WITH OFFSET
MODULATION INPUT DIGITAL SINGLE ENDED (TTL)
The single ended analog modulation input with
offset allows the direct dc-coupled connection
to an analog source with 1.65 V dc offset (this
is ½ of the commonly used 3.3V supply).
The TTL level input can be used with digital
signal sources.

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
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TXS INSTRUCTION MANUAL 0002 2015 specificationssubject to change without notice Page 8 (10)
MODULATION INPUT DIGITAL DIFFERENTIAL (RS422)
The RS422 input is suitable for longer distanc-
es with twisted-pair cable. This mode guaran-
tees the best noise immunity performance.

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
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SERIAL INTERFACE PROTOCOL DESCRIPTION
THIS MANUAL IS UNDER CONSTRUCTION !
A detailed protocol description will be included in one of the next docu-
ment versions. Please check → txs_manual.pdf for updates.
Quick startup guide:
(1) you'll need a non-inverting TTL-level RS232 connection:
TxD(PC) to RxD(TXS)(Pin6)
RxD(PC) to TxD(TXS)(Pin13)
GND(PC) to GND(TXS)(Pin11)
(2) start terminal software 57600,N,8,1
(3) connect power supply
TXS will send status screen:
RESET; EEPROM_CS=ED85; '?' = HELP MENUE
====[ TXS-S1-P6-Z-X ]==========================================================
PIC24FJ64GB004; SW=TXS1; V=001; SN=012345; FREQ=2250.000000; STEP=0.200000;
INP=ANA_SINGLE; POL=POS; ATT1=04.00; ATT2=01.50; DCC=OFF; PWR=9;
-------------------------------------------------------------------------------
(4) single character commands:
'?' = help screen
ESCAPE(27) = abort command sequence in progress
RETURN(13) = status screen
(5) command protocol:
parameter + control character + RETURN(13)
Example (change frequency to 2300 MHz):
"2300F" + RETURN
(6) choose input configuration:
factory setting is analog single ended, 2Vpp for +/-2.6MHz deviation
** until now all changes are temporarily **
So you can try out several configurations without affecting the saved settings.
(7) save the current setting in nonvolatile EEPROM:
send “OPEN” + RETURN this will open the EEPROM write mode
the TXS answers “_OK” (screen display is “OPEN_OK”)
send “SAVE” + RETURN this will save the current setting in the EEPROM
the TXS answers “_OK” (screen display is “SAVE_OK”)

KMT - Kraus Messtechnik GmbH
Gewerbering 9 Tel. [phone] www.kmt-telemetry.com
D-83624 Otterfing Fax [phone] [e-mail]
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COMMANDS:
Command Format: pppppp[CR] (pppppp = Parameter, [CR] = ASCII 13)
[CR] without parameter = Status; [ESC] = abort current action;
--------------------------------------------------------------------------
Change Frequency: 2250F[CR] (2200=2.2GHz; 2300=2.3GHz)
--------------------------------------------------------------------------
Attenuator 1: 200A[CR] Attenuator 2: 1000B[CR]
'(' or ')' = change Input-Attenuator (1) in single steps
'-' or '+' = change Main-Attenuator (2) in single steps
Parameter: Value in 0.01dB (example: 200 = 2dB)
ATT1: The input attenuator range is 14 db in steps of 2 dB.
ATT2: The main attenuator range is 31.5 db in steps of 0.5 dB.
--------------------------------------------------------------------------
Modulation Polarity: 0V[CR] (0=positive; 1=inverted)
--------------------------------------------------------------------------
DC Compensation Mode: 0D[CR] (0=OFF, 1=ON)
--------------------------------------------------------------------------
Power Step: 9P[CR] (0=OFF; 8=LOW; 9=HIGH)
--------------------------------------------------------------------------
Input Configuration 4C[CR] (0=OFF; DIGITAL: 1=RS422; 2=TTL; ANALOG:
4=SINGLE_ENDED_ZERO; 5=DIFFERENTIAL; 6=SINGLE_ENDED_WITH_OFFSET)
--------------------------------------------------------------------------
Restart Device: RESET[CR]
--------------------------------------------------------------------------