User's Manual
M7X and M7R Page 4-20 Installation
Back to Menu
Table 4-7 Narrow-band (A) Audio Connector Pin-Out
Pin Signal Characteristics Input or Output
1
2
NB (A) line out -
NB (A) line out +
Balanced 600 ohm, transformer coupled audio output
adjustable between -20 dBm and +10 dBm in 1 dB
steps. The factory default setting is -13 dBm.
A phantom squelch output, superimposed on the audio
lines, is available; this is a normally open solid-state
relay operating between -60 V and +60 V ac or dc, at a
maximum 100 mA.
Output
3 PTT indication
Grounding solid-state relay that indicates an active PTT.
The relay, configurable to be normally open or normally
closed, operates between -60 V and +60 V ac or dc, at a
maximum 100 mA. The factory default setting is
normally open.
Output
4
5
NB (A) line in +
NB (A) line in -
Balanced 600 ohm, transformer coupled audio input that
is adjustable between -20 dBm and +10 dBm in 1 dB
steps. The factory default setting is -13 dBm.
Phantom PTT is active when the input differs from the
reference by less than ±1 V. Maximum input is ±60 V
with respect to reference. Input draws less than 6 mA
and requires at least 1 mA to operate. Common
reference with pin 8 that is programmable to be +14, 0 or
-14 V (±1 V). The factory default is +14 V.
Input
6 NB (A) squelch
Grounding solid-state relay providing a squelch
indication output. The relay operates between -60 and
+60 V ac or dc at a maximum current of 100 mA. The
relay is configurable to be normally open or normally
closed. The factory default setting is normally open.
Output
7 Ground 0 V. -
8NB (A) PTT
PTT input that is active when input differs from reference
by more than ±10 V and inactive when input differs from
reference by less than ±1 V. Maximum input ±60 V with
respect to reference. Input draws less than 6 mA and
requires at least 1 mA to operate. Configurable as
Standard or Inverted; factory default is Standard.
Pin 8 has a common reference with pin 5 that is
programmable to be +14, 0 or -14 V (±1 V). The factory
default is +14 V.
Input