Specifications

Pin Number: 7
Name: REMOTE TX AUD
Type: Analog Input
Description: This pre-emphasized audio input modu-
lates the transmit carrier when the REM
LED is illuminated, when the REMOTE
PTT is taken to its active state and when
no higher priority PTT has been enabled.
Impedance: 600 ohms nominal, unbalanced.
Level: Depending upon the setting of R553 (RE-
MOTE AUDIO ADJ.) on the main board,
between 25 mv and 250 mv RMS nomi-
nal at 1 kHz will produce ± 3 kHz devia-
tion.
Frequency
Response:
From 300 Hz to 3 kHz within +1/-3 dB of
a 6 dB/octave pre-emphasis curve.
Pin Number: 8
Name:
COR OUT
Type: Digital Output
Description: This is a transistor’s open collector to
ground output, which is active when a
carrier of sufficient level to operate the
BZ LED is being received.
Level: When active, this output will remain at a
voltage less than 0.8 volts while sinking
up to 50 mA. When inactive, the leakage
current is less than 500 nA at voltages up
to 50 volts. Voltages above 50 volts may
damage the output transistor and should
be avoided.
Pin: 9
Name: DISCR OUT
Type: Analog Output
Description: Buffered, unsquelched output of the re-
ceiver discriminator.
Impedance: 600 ohms nominal, unbalanced, DC cou-
pled.
Level: An on-channel signal will produce 1.3
volts DC nominal into an open circuit.
Open circuit output level is 200 mv/kHz
nominal.
Frequency
Response:
Flat within +1/-3 dB, DC to 3 kHz.
Polarity: Negative; an increase in frequency will
cause a reduction in ouput voltage.
Pin: 10
Name: INTRCNT. RX AUD
Type: Analog Output
Description: Buffered and squelched de-emphasized
audio output.
Impedance: 600 ohms nominal, AC coupled.
Level: This output will be 350 mv RMS open
circuit nominal when the receiver is re-
ceiving a noise quieted signal modulated
at ± 3 kHz by a 1 kHz tone.
Frequency
Response:
From 300 Hz to 3 kHz within +1/-3 dB of
a 6 dB/octave de-emphasis curve.
Pin: 11
Name: DATA IN
Type: Analog/Digital Input
Description: This flat (no pre-emphasis) input modu-
lates the transmit carrier when the DATA
PTT is taken to its active state and no
higher priority PTT has been enabled.
This input is designed primarily for digi-
tal (logic level) signals, but can accept
analog signals of the proper level.
Impedance: 20 kohms, DC coupled.
Level: For digital inputs, the two logic levels are
-15 to +0.5 volts and +3.5 to +15 volts.
With these levels, either standard
TTL/CMOS or RS-232 logic inputs may
be used. For analog inputs, a 100 mv
RMS signal nominal at 1 kHz will pro-
duce ± 3 kHz deviation. A capacitor in
AE/LZB 119 1882 R1B
17