Scherrer UHF Tx700Pro User manual

MANUAL
Transmitter, Pro & Lite
Receivers, Long Range & Normal range
Rev 1.0
Rev Date. 09/03/2016

1
Indhold
Foreword TSLRS................................................................................................................................................. 3
Foreword Transmitter ....................................................................................................................................... 3
Technical Specs.................................................................................................................................................. 3
Tx700Pro........................................................................................................................................................ 3
Tx700Lite ....................................................................................................................................................... 4
Inputs/Output connectors Tx700Pro............................................................................................................... 4
Tx700Lite ....................................................................................................................................................... 4
Hardware specifications .................................................................................................................................... 5
Tx700Pro........................................................................................................................................................ 5
Tx700Lite ....................................................................................................................................................... 6
TX BATTERY LIFE ............................................................................................................................................ 6
Physical Dimensions .......................................................................................................................................... 7
Tx700Pro........................................................................................................................................................ 7
Tx700Lite ....................................................................................................................................................... 7
Legal Information .............................................................................................................................................. 7
Adapter wiring................................................................................................................................................... 7
Binding in details ............................................................................................................................................... 8
Change unique ID code...................................................................................................................................... 8
Tx700Pro........................................................................................................................................................ 8
Tx700Lite ....................................................................................................................................................... 8
Output Power selection button......................................................................................................................... 9
Tx700Pro........................................................................................................................................................ 9
Failsafe............................................................................................................................................................... 9

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Compatibility TX-RX........................................................................................................................................... 9
Compatible RC's................................................................................................................................................. 9
Head Tracker.................................................................................................................................................... 10
Tx700Pro...................................................................................................................................................... 10
Tx700Lite ..................................................................................................................................................... 11
Compatible Head trackers............................................................................................................................... 12
Option Board ................................................................................................................................................... 12
Tx700 Pro..................................................................................................................................................... 12
Modem Setup Option Board ........................................................................................................................... 12
Tx700Pro...................................................................................................................................................... 12
How to get best range ..................................................................................................................................... 13
LED indicator.................................................................................................................................................... 13
Range Check .................................................................................................................................................... 13
Known Limitations........................................................................................................................................... 14
Foreword Receivers......................................................................................................................................... 15
Physical and technical specifications............................................................................................................... 15
Rx700 Normal Range ................................................................................................................................... 15
Rx700 Long Range ....................................................................................................................................... 16
Binding............................................................................................................................................................. 17
Failsafe foreword............................................................................................................................................. 17
The 3 Failsafe in detail..................................................................................................................................... 17
Ch12/PPM options........................................................................................................................................... 18
RSSI output ...................................................................................................................................................... 19
Connectors Servo............................................................................................................................................. 19
Serial Debug Output ........................................................................................................................................ 19
Special Features Configurations ...................................................................................................................... 21
Channels on Normal Range ......................................................................................................................... 22

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Antenna setup ................................................................................................................................................. 23
Bad antenna position .................................................................................................................................. 24
Firmware upgrading ........................................................................................................................................ 25
Option Board for RX LR 7.01............................................................................................................................ 28
LED indicators.................................................................................................................................................. 29
Abbreviations................................................................................................................................................... 30
FPV general trouble shooting guide ................................................................................................................ 33
Design hints: ................................................................................................................................................ 33
Radio Technical knowledge ............................................................................................................................. 35
Warning and Disclaimer ......................................................................................Error! Bookmark not defined.
Foreword TSLRS
In this manual you will find guides to setup your system, tips to get most out of your system and how to
trouble shoot you problems. If you want to get a quick answer to your question you can go and see our FAQ
list, which contains all kind of questions we have received both simple and more technically oriented.
Foreword Transmitter
Here you will find the information which is needed to make your transmitter perform at the very best both
for Tx700Pro and for the Tx700Lite. Notice if the Pro or the Lite is not listed under a subject, it means that
it’s the same for both.
Technical Specs
Tx700Pro
RF Output power: 500mW/1000mW/2000mW.
RF Output connector: BNC female.
The transmitter power is user selectable via easy to access 3 way switch.
(We recommend using “low” power mode, so power up is possible in case of an out of range situation will occur)
The transmitter can handle full power, continually no time limit.

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The antenna output is designed for 50 Ohm load; however the transmitter stage is specially protected and
can handle full power at both open and shorted antenna.
It is normal to perform range check with antenna removed and 500mW setting.
Tx700Lite
RF Output power: 500mW
RF Output connector: SMA female
RF Input: DIN 4
The Antenna output is designed for 50 Ohm load.
The PPM input signal can be either constant frame repeat time, or variable, Positive or Negative
polarisation. The special double speed Futaba PPM signal is also accepted, Auto detects and auto handle.
The main PPM signal must contain from 4-12 servo channels, if main PPM signal has under 4ch it will be
refused.
Note: Graupner call each way a servo travel for a channel, so in Graupner terms a 24 Channel setting
handle 12 servos, and is what we call a 12 channel signal.
Inputs/Output connectors
Tx700Pro
DIN 3 pin female screw type for POWER and MAIN-PPM input
The female DIN connector seen from outside the TX
Tx700Lite
Power input connecter
Power input connecter is centre positive

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DIN 4 pin female screw type for POWER and MAIN-PPM input
Stereo Jack for Audio Demodulator Input, and Head-Tracker PPM input
The top of the connector is Head-Tracker PPM input (shorted HT)
The Ring of the connector is AUDIO input from the wireless video system receiver.
Ground is common for both signals.
Shielded cables are recommended to avoid cross talk.
Hardware specifications
Tx700Pro
Supply voltage 5-25V for 500mW power
Supply voltage 6-25V for 500mW-1000mW-2000mW power
Supply power usage is 3 times the transmit power.

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Supply current at 20V (500mW x 3 = 1.5W / 20V = 0.075 Ampere)
Supply current at 10V (500mW x 3 = 1.5W / 10V = 0.15 Ampere)
Supply current at 6V (2000mW x 3 = 6W / 6V = 1 Ampere)
Tx700Lite
Supply voltage 5-25V for 500mW power
Supply current at 20V (500mW x 3 = 1.5W / 20V = 0.075 Ampere)
Supply current at 10V (500mW x 3 = 1.5W / 10V = 0.15 Ampere)
TX BATTERY LIFE
The TX unit draw about 1.5W as mentioned at 500mW out, to find the current it draw we use ohms law.
Examples: Watt / Supply Volt = Current, the supply voltage can be anything from 6-25V.
Example with a 3S lipo: 1.5W / 11V = 0.126A
To find the time you can run with a given battery size, take your battery mAh and divide with current usage
also in mA. Example: 1000mAh / 126mA = 7.9 hrs, remember to keep a good safe margin, some batteries
like LIPO do not like to be fully empty.
When using the power-up feature, input supply power will also go up. The unit has about 30-40%
efficiency, so an easy rule is the input usage is 3 times as much power as the output power. At 2W RF out;
the TX unit consume almost 6W, this means 4W is radiated as heat.
The TX unit can deliver 500mW out at only 5V as supply voltage; it will stop working at 3.3V or under.
For 1W and 2W output, you need supply voltage of at least 6V. Maximum is 25V!
Peak operating heat sink temperature -40C to + 80C
Suggested Operating heat sink range -20C to + 60C
PPM input, both main PPM and HT PPM, level 1.5Vpp to 10Vpp.
AC or DC coupled, this means it is also JR and Graupner student signal compatible. However for serious
stable long range flight, it is recommended to use a 3-5V DC coupled PPM signal for best stable signal to
noise margin.

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Physical Dimensions
Tx700Pro
Height: 32mm
Width: 74mm
Length: 100mm
Weight: 280 gram
Tx700Lite
Height: 25mm
Width: 55mm
Length: 85mm
Weight 128 gram
Legal Information
The radio system is using frequency hopping, random sequence with very short time slots. The time pr
channel is only 15mS, which means it apply to the 10mW pr average channel regulation in EU and many
other areas. This means the 500mW peak setting can be used legally without any radio amateur licence.
Note* The Tx700Lite is CE approved and certified.
Adapter wiring
Futaba
JR/Graupner
Multiplex
Naked (only for Tx700Pro)

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Binding in details
The binding function stores the TX signal unique ID code and PPM frame rate and number of servos into the
receiver; this must be done every time the number of servos is changed on the RC unit. (or another RC with
PPM system)
The binding process is the same on Tx700Lite.
To bind:
1. Power off, Tx and Rx.
2. Hold down bind button on Tx.
3. Power up the Tx, (we assume right plane memory is recalled on your RC unit).
4. Power up receiver, make sure both antennas are connected and within 20 meter / 65 feet distance.
5. Wait 1-2 sec, see the RX LEDs go from lit into fast blink mode.
6. Power off Tx (Rx is still on).
7. Power on Tx (Rx is still on).
8. Test all servo functions on plane works and have ultra fast and smooth response.
9. With TX on, try to power OFF and ON the Rx and prove it lock to the Tx very fast after power on.
Instruction video on how to bind and store failsafe - http://www.youtube.com/channel/UCS2wXoorQHQaYmoSLE5_esg
If you use external battery for the LRS TX, then the binding procedure is a little bit different, leave the RC
unit on ALL the time and connected to the LRS TX, the power on/off to the TX as mentioned in the binding
procedure is only the LRS TX, now it will work, the binding mode is only activated when button is held down
while power to the LRS TX is applied.
Change unique ID code
Tx700Pro
Remove the top lit, inside the TX unit you find a DIP switch with 8 tiny white buttons, which can be slide up
or down.
Tx700Lite
Remove the top lid with the bind button and led. Now pull the board out slowly from the other end. Inside
the Tx unit you find a DIP switch with 8 tiny white buttons which can slide up or down.

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Note: The text ID code next to it. If you need to create a take-over mission, then the two TX units must have
the same ID code to be accepted by the RX. If you need to fly side by side with a friend, just be sure you use
different ID code. After ID code change, a new bind must be performed.
Output Power selection button
Tx700Pro
The 3 way transmit power switch is located near the antenna connector on the top, where it is most easy to
access while in flight. Move the connector close to the antenna connector for low power mode. It is
recommend to use as little as possible power, so power-up is possible in case an out of range situation is
experienced, this way it is possible to regain control and fly back home.
Failsafe
The same push button on the top is used both for binding, and to store Failsafe into the receiver.
When the button is pressed while the TX is powered on it’s in the binding process.
When the TX is in normal flight mode, the button is used to store failsafe.
The failsafe procedure is explained on page 18.
Compatibility TX-RX
All versions of TSLRS RX units can be binded and work together with any versions of TSLRS TX units.
Since the over air signals are kept the same from the very start. The TSLRS system parts is NOT TX-RX
compatible with any other brands of long range systems, we all use our own radio modulation system.
Compatible RC's
Any Radio Control remote system with PPM output should be able to used, check your manual for student
out, and if it is compatible with PC simulators and other types of RC systems, then you know you got a PPM
signal and not a special un-compatible digital signal. The PPM signal can be any polarity, and also variable
speed, and even the special Futaba double speed mode is supported. See our RC compatible chart to
secure that your RC works.

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Head Tracker
The Head tracker input must be 6 channels PPM. It accepts positive or negative polarization, variable or
fixed frame rate auto detect and auto handle. Channel 5 and 6 are the two HT (PAN/TILT) signals. They are
added after the used MAIN-PPM channels. In case the main PPM signal got 12channels in it, there are no
free channels to use. Then the two HT signals will be merged into channel 10 and 11, leaving channel 12
free to use for the main PPM. The reason for this is easy to understand, look at the receivers: the channel
12 connector can be either PPM out or servo channel 12 out, the different output mode is configured on
the RX, in case you need PPM out and use a HT at the same time, you need off course the HT signals to be
on ch. 10-11 where normal servo connectors exist.
Tx700Pro
The head tracker input is integrated in the Tx700Pro

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Tx700Lite
With the Tx700Lite –the head tracker input is integrated in the cable

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Compatible Head trackers
The Fat Shark, M.I.G. Tracker, Magnetic Inertial Gyro
Or any other type with the required signals, see Head Tracker section above.
Option Board
Tx700 Pro
The extra add on board called Option-Board can be installed by the user.
The extra features are:
Firmware upgrade via USB connector.
Both the TX main board, and the Option board CPU can be upgraded with this option board.
Data Demodulator and PC USB interface, for UAV systems. (live 2 way data is then possible)
Voltage monitor with audio alarm.
THIS SECTION WILL BE UPDATED WHEN THE OPTION BOARD IS RELEASED.
Modem Setup Option Board
Tx700Pro
The Audio signal is 1200 Baud FSK from a video receiver, the level can be from 200mV to 2000mV
adjustable on the upgrade board trimmer, adjust trimmer for carrier LED LIT, find the two points where the
LED is not lit, and set it in the middle of that for best margin to both sides. Install FTDI232 VCD driver on the
PC, run your UAV control software to display live flight parameters.
THIS SECTION WILL BE UPDATED WHEN THE OPTION BOARD IS RELEASED.

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How to get best range
Archived range is only the result of the wanted signal to noise ratio. Local noise emitters are the most
common way to ruin good receiver’s capabilities to pick up weak signals at long range. The system got a
transmitter to receiver calculated line of sight range of over 100km. We know at least one customer who
actually performed a full flight over 100km out and back. To be able to get the full possible range this
system can deliver, you need to be very sure nothing on your plane emit noise in the used frequency band,
if it does it will affect the range. This means also it is very easy to detect using range checks.
LED indicator
Constant light = PPM ok, power supply ok
Blinking LED = Power supply ok, but no valid PPM
No Light = No power supply voltage
Range Check
Can be done just like any conventional RC systems and please follow the following steps:
1. Unmount the TX antenna and set it to low power.
2. Expect 4-10 meters of range.
3. Check you have same (short) range with motor on/off and with video cams and video transmitters
on/off.
4. If no change in the range result, then mount TX antenna again and fly.
5. If any unit on your plane affect your range, you are supposed to seek and fix it, if you want to take
full advantage of the systems capabilities, or at least obtain a system with best possible signal to
noise margin.

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Known Limitations
Landscape variations and noise pollution in the flight area is known to shorten the range of any wireless
link. Use at least 1/10 of the distance as height. For example at 3 km/1.8mile, distance stays 300
meters/984 feet up, to get full range.
The Tx700Pro with will provide you with a signal to 100km/62 miles range depending on power selection
and on which receiver is used.
This Tx700Lite with 500mW will provide you with a signal to 25 km/15.5 miles range depending on which
receiver is used.

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Foreword Receivers
Here you will find the information which is needed to make your receiver perform at the very best. Both
the long range receivers and normal range receivers will be listed under each subject.
Physical and technical specifications
Rx700 Normal Range
The receiver board: 26 x 54mm.
Weight: 6.5 gr. (8.5 grams including wire)
Sensitivity: -102dBm.
Input supply voltage range: 4-10V.
Servo signal pulse output: 3.3V positive.
Radio band: 433 & 444 MHz multi band and multi frequency hopping system.
Temperature range: -40C to +70C tested.
Receiver 8ch - optimized input filter so it can co-exist with strong 2.4 GHz on board video transmitters.
Wire antenna mounted directly on the Rx.
The extra pin in ch 12 connector is RSSI out. Ch 12 connector is also PPM out when < 12ch are used.
PPM out is the same as sum-signal and this is of course fully compatible with MikroKopter controller board,
all RX have this SUM and RSSI out.

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Rx700 Long Range
This receiver have improved input filter and makes it now even better attenuation for 900 - 1300 - 2400
video transmitters. This is virtually impossible to jam. The Rx700LR also have improved distance of the
servo connector and now all 12 can be mounted at the same time and no bending or problems.
The receiver have the following dimensions:
Width: 34 mm.
Length: 62 mm. including angled connector.
Height: 10 mm.
Weight: 16 gr.
The receiver uses a Double LNA (Low Noise Amplifier) frontend with fast signal switch so it uses the best
signal.
Two MCX connector coax dipole wire antennas come with each RX t –Weight: 5.4 grams each.
The extra pin in ch 12 connector is RSSI out. It’s now buffered so loading of the RSSI out is uncritical, 1k
ohm Zout. It is also filtered to avoid less jumpy OSD readings.
CH 12 connector is also PPM out when < 12ch are used (auto mode is the default).
PPM out is the same as sum-signal and this is off course fully compatible with MikroKopter controller board
and all RX types and models have this.
Sensitivity: -113dBm to -114dBm
Input supply voltage range: 4-6V (Rx uses 134mA at 5V)
Servo signal pulse output: 3.3V positive
Radio band: 433 & 444Mhz multi band and multi frequency hopping system.
Temperature range: -40C to +70C tested

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Binding
The binding function stores the Tx signal unique ID code and PPM frame rate and number of servos into the
receiver; this must be done every time the number of servos is changed on the RC unit. (or another RC with
PPM system). The binding procedure is explained on page 8.
Failsafe foreword
The push button on the top of the TX is used both for binding, and to store Failsafe into the receiver.
When the button is pressed while the TX is powered on the unit is binding. When the TX is in normal flight
mode, the button is used to store failsafe.
The different modes of failsafe in the receiver manual are:
The “Normal”
The “Sequential”
The “None”
All kinds of FAILSAFE storing and testing should be carefully performed with the plane firmly grounded.
It’s normally good use full failsafe style to program the plane to shut of motor and turn slowly to the left
side. Some FPV/UAV systems can use other settings; the user should know what is best for his usage.
Always test if it’s working as expected before a flight – Test if recall the wanted function and recover again
when the TX is powered back on.
The 3 Failsafe in detail
The normal kind of failsafe is one set of servo positions stored in the receiver. This setting will be recalled
and used when the radio signal is lost for about 1 second. To store a set of servo positions, push and hold
the button for 1 second and then release it. Please be sure not to push it again the next 5 seconds.
The “Sequential” works almost the same way. The difference is that you push the button again under 5 sec
after release to store the next set of servo positions. This can be repeated 3 times to use all 3 servo
memories. They are recalled in same order as stored, and when/if the radio signal is recovered the return
to normal flight is the reverse way.

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The procedure is as follows:
The radio signal is lost - recall 1, recall 2, recall 3.
Radio signal back, - recall 2, recall 1, live.
It will run scan mode which means, if a good package is received while it is in recall 2 state, it will go directly
to recall 1 and then back live. Each recall state take about 0.3 seconds then it recall the next state. This
special kind of failsafe can be used to handle special features on some multi rotor flight controller boards to
activate the RTH or safe landing procedures, depending on how you moved your switches while you stored
the fail safes.
The “None” is when the receiver doesn’t have any positions stored at all. In this way nothing will be
recalled and it will simply hold last known good position of all servos. To clear the failsafe memory, hold the
button for 5 sec.
A little side note on failsafe storing. The Receiver will lose radio link and recall failsafe settings while you
activate a storing. The reason is the kind of memory used for this is a bit slow and while the CPU waits for
the saving it’s not able to maintain a perfect hoping sequence. This is perfectly normal but it is not normally
seen when you only store one set of positions, since the values you recall while you hit save are mostly the
same as your active positions.
Ch12/PPM options
The signal CH12/PPM - If you use under 12ch you will always get PPM out of the ch12 connector. However
if you need PPM out and use 12 channels then you simply configure it to be in PPM OUT (See special
features configurations for guidelines how to do this).

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RSSI output
The little extra PAD over the CH12 connector is the RSSI output and you the bottom pin row for ground.
This is an analogue voltage that reveals how strong the signal is from the TX. Many OSD types can use this
voltage to display a calibrated 0-100% readout on the screen display. The Min and Max voltages are a little
bit different from RX to RX, so you must perform a new calibration if you swap a receiver in your system.
Connectors Servo
Look carefully at the connector pins and the PCB. The edge rows are all GROUND, the centre row are +5V
and all top pins are the servo channels out.
Serial Debug Output
The upgrade connector pin out
1 = GROUND (2, 3, 6 are not connected)
4 = Radio data (do not connect anything to this pin in flight mode)
5 = Debug data output
The debug out is a 3.3V serial signal, can be used for OSD or onboard flight recorders,
The data format is very simple, 9600 Baud 8N1.