2
SPECIFICATIONS
Operating Voltage
5.5-15 VDC
Operating Current
3 mA
PTT Output Current
250 mA
Audio Output Level
0-750 mV(rms)
Audio Output Impedance
1 K or 50 K
Twist
0-3 dB
Max Tone Distortion
2%
Interkey Time (Auto PTT)
2 seconds
Adjustment Pots
1 Turn
Operating Temperature
-30° to +60°C
Dimensions with Bezel Frame (standard)
2.4" x 1.9" x 0.4"
Dimensions without Bezel Frame
2.0” x 1.5" x 0.25"
GENERAL INFORMATION
The TT-9 is a 12-digit DTMF dial encoder with snap-dome keypad in a mountable bezel frame. The TT-9 will
automatically assert the PTT output when a button is pressed and hold the PTT output for 2 seconds for
subsequent digits to follow. The DTMF tones are generated out the TX Audio Output for as long as the key is
pressed.
The following diagram shows the DTMF tone pairs generated when a particular digit is pressed. For example
when the 1 digit is pressed the TT-9 will generate 697 Hz and 1209 Hz simultaneously.
1
2
3
4
5
6
7
8
9
*
0
#
697 Hz
770 Hz
852 Hz
941 Hz
1209
Hz
1336
Hz
1477
Hz
