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UHF-FM Synth. Power Transmitter 70TX-E2The 70TX-E2 is a professional 500mW narrow band FM radio transmitter according toEN 300113 and has been improved in many respects compared to its predecessor 70TX-E. Theinnovative concept combines the advantages of the DDS with those of the synthesizer in a uniqueway. The signal digitization offers a resolution of 12 bit. Further signal processing is completelydigital. The result is an almost perfect RF signal with excellent transmission characteristics forboth analog and digital signals.
The package volume was reduced by 50% compared to the 70TX-E. The 70TX-E2 is now one ofthe smallest synthesizer UHF transmitter modules with 500 mW transmission power. The moduleis therefore particularly suitable for portable and mobile applications. At the same time, the powerrequirement dropped by more than 10% at full transmission power. To optimize powerconsumption, the integrated SPI interface can be used to reduce transmission power from500 mW to 1 mW. Other parameters can also be changed during operation via SPI (frequencyand start channel). The RF power amplifier is largely immune to mismatch at the antenna due toextensive protective measures.
When changing the operating states (power on and frequency change) usually occurs broadbandinterferences (called transients), which hinder the simultaneous use of multiple radio links in
the near area. With the 70TX-E2, even the adjacent channels are not disturbed under these
conditions. Together with the short settling time, the module is therefore predestined for use in
TDMA or frequency hopping applications. The two available standby modes reduce the startuptime and the amount of the required components to a minimum.
In combination with our 70RX-M2 or 70RX-S2 receivers, very long range radio systems can beset up for simplex or half-duplex operation. Together with our control module FSM24 the free field
range is over 5000 meters.
Features Applications
Narrow band multi channel transmitter Remote control systems
very small size Data communication
low current consumption Industrial applications
Data rate up to 9600 Bd Telemetry systems
Compliance to RED (2014/53/EU) Alarm systems
EN 300220 and EN 300113 Security systems
Real size
Rev. 01
UHF-FM Synth. Power Transmitter 70TX-E2
Specifications:
Communication Simplex
Frequency range 433,0625 – 434,7875 MHz 12.5 / 25 kHz spacing
Optional frequency range 250 – 550 MHz Spacing on customers request
Number of channels 139 at ISM, else up to 256 with SPI programming up to 1000
Output power 350 mW at 50 Ω / 5 V 500 mW at 50 Ω / 6 V
Adjustment range 1 mW - 500 mW in 1dB steps
Output power standby mode none
Modulation FM narrow band
ACP unmodulated typ. 65 dB
Data rate DC – 5 kHz (9600 Bd)
Deviation standard: ± 2.4 kHz (± 50 Hz) at 25 kHz spacing
± 1.0KHz - ± 2.5 kHz (± 50Hz) adjustable by SPI (planned)
Temperature range –40°C...+80°C (with TCXO)
Supply voltage 4.7 – 8.0 V max. 4.5 – 12 V (only with duty cycle)
Supply current < 270 mA (± 30 mA) at 5 V < 290 mA (± 30 mA) at 6 V
< 250 uA (Low power mode) < 17 mA (Standby mode)
Settling time < 25 ms (Voltage on)
Settling time from standby typ. 4 ms (Standby mode) < 25 ms (Power saving mode)
Hopping Time < 10 ms (for a 800 kHz hop)
Dimensions 49.2 x 24.9 x 9,7 mm with lashes 60.0 x 24.9 x 9.7 mm
Weight 20 g
Material stainless steel with M3 mounting lashes
Antenna connector SMA optional SMB, MCX, MMCX or coax
Approvals RED EN 300220 + 300113 433.0625 - 463.0625 MHz
FCC / CAN planned
UHF-FM Synth. Power Transmitter 70TX-E2
Dimensions and interface:
54,0
mm
7m
m
3,2
mm
49,2
m
60,0
mm
r=2m
m
35,3
mm
13,9
mm
9,7
mm
5,7
mm
35,3
mm
13,9
mm
45,8
2m
m3,3
8m
m
24,9mm
SMA: 32,9mmSMB: 31,6mmMCX: 30,7mm
20,65mm
19,05mm
Compatible plugs for SMD available
D0
D1
D2
D3
D4
D5
D6
D7
GND
LDMod
Vdd
TX/RX
Audio
RSSI
Mute
UHF-FM Synth. Power Transmitter 70TX-E2
Interface description:
Mute not connected at this module
RSSI Input: Power saving in standby mode (internal pullup to 3.0V)
Pin open = power saving off (17mA, settling time 4 ms)
Pin to ground = power saving on (< 250uA, settling time 25 ms)
Audio not connected at this module
TX/RX Input: Standby function (internal pullup to 3.0V)
Pin open = standby mode, RF power off (17 mA or < 250 uA)
Pin to ground = transmit mode (TX), RF power on (290 mA at 6 V)
There is no timing to consider. The module generally suppresses the occur-rence of transients when operating states change. The module only needs to
be put into standby mode before the supply voltage is switched off.
Vdd Input: Power supply of the module
4,7 – 8.0 V DC stabilized, minimum voltage 4.5 V, absolute maximum
voltage 12.0 V (only allowed with duty cycle), internal low noise and low drop
voltage stabilization to 4.6 V, no reverse voltage protection
MOD Input: Modulation (analog or digital)
TTL compatible 5 Vpp (with a DC Offset of 2.5 V or AC coupled)
The input is DC capable. Shifting of the DC-Offset therefore changes thetransmission frequency. The unconnected input has a DC offset equal to halfthe nominal modulation voltage. Either the incoming modulation signal musthave the same DC offset or be coupled via a capacitor (we recommend 1uF).However, a capacitor cuts off low frequencies of the spectrum.The nominaldeviation of 2.4 kHz is achieved at a modulation voltage of 5 Vpp. A lowermodulation AC voltage reduces the available deviation of the module.
LD Output: Lock detect indicator (open collector)
This output indicates if the synthesizer is locked (3.0 V if locked, else 0.0 V).
GRD Ground of the module (also connected to the metal case)
D0 – D7 Frequency setting, based on the bit pattern (internal pullup to 4.5 V)
Output of the lowest possible frequency if not connected. Grounding of theweighted pins D0 - D7 rises the frequency stepwise (f.e. at 12.5 kHz raster:D0 12.5 kHz, D1 25 kHz, D2 50 kHz,..., D7 1.6 MHz). The easiest way of theimplementation is a DIP-switch which is connected to DO – D7 and groundedon the other side. The corresponding table to set up your desired frequency isavailable on our homepage.
frequency=start frequency+raster∗∑i=0
7
(Di∗2i)
