User's Manual

3. Port description and technical data
+5-8V DC supply voltage of the modul without reverse voltage protection
minimum 4.8V DC, maximum 8 V DC (continous wave)
absolut maximum rating 11V DC only with duty cycle (pay
attention to the heating of the modul)
Metal case ground of the modul
St.by standby pin of the modul to improve a faster startup time
open pin = transmitting mode, grounded pin = standby mode
If you don`t use this function let the pin unconnected!
Do not put some voltage to this input!
Mod. modulation input of the modul is calibrated to TTL signals
maximum input voltage 2.5V DC + 2.5V sin(nωt)
Ant. antenna output of the modul (impedance 50 Ω)
Modulation frequency 0 - 5 KHz
Modulation input impedance > 4.7 KΩ
Supply current 330 mA (+ / - 100mA, depends on load)
RF – output power 27 dBm +/- 1.5 dB conducted
Frequency deviation +/- 2.5KHz with TTL signal at the modulation port
Frequency accuracy + / - 1.5 KHz
Temperature stability + / - 2.5 KHz (- 20°C .. + 55°C)
4. Restrictions
- Do not supply a higher modulation input level to the modulation input as specified
in 3.
- Do not use the 70TX-D radio modul to transmit voice
- Do not build illegal spy devices using the 70TX-D radio module
- Do not operate the modules at lower or higher supply voltages as specified
- Do not put reverse voltage to the modul (it will be damaged)
For any further question, comments or advices, please contact HM-Funktechnik at
[e-mail]