User's Manual

70-STR1700-000 Rev A.1 STR-1700 O&M Manual
7
TABLE 2-4 AUDIO/CONTROL CONNECTOR PIN ASSIGNMENTS
PIN SIGNAL DESCRIPTION AND CHARACTERISTICS
2
Ground
Ground for the external interface side of the EIC card as well as
all externally driven signals or power inputs via the
Audio/Control Connector.
4
Receive Audio
Recovered audio signal output from the radio. Approximately 1 V
p-p into a 600 ohm resistive load for 300 to 3000 Hz outputs.
7
Transmit
Enable (i.e.,
Push-to-Talk)
Places the radio into transmit mode when low (i.e., grounded) or
receive mode when high or floating. Input will support 20 mA
current or 28 volt stand-off.
8
Serial
Programming
Interface
Half-duplex serial line utilized to program frequencies,
bandwidths and output power selections into the STR-1700. This
interface should only be utilized with the SRI provided
programming interface cabling/software.
9
Radio +5 VDC
VCC from the main radio unit. THIS OUTPUT IS PROVIDED AS A
MONITOR POINT ONLY!!! May be utilized to validate that the STR-
1700 is in a power on state.
10
Serial
Programming
Interface
Half-duplex serial line utilized to program frequencies,
bandwidths and output power selections into the STR-1700. This
interface should only be utilized with the SRI provided
programming interface cabling/software.
11
Ground
See “Ground” description above.
12
Power On/Off
Control
Toggle control for radio on/off control. Reference the notes
that follow this table for further description.
13
Radio Ground
Ground for the internal interface side of the EIC card as well as
all internal radio logic of the STR-1700. Note – do not connect
this signal to an external ground. Signal is provided only to be
used in conjunction with Power On/Off Control as described below.
14
Channel
Select 2
Control signal which when combined with “Channel Select 0” and
“Channel Select 1” forms a 3-bit binary channel selection
control. Input will support 20 mA current or 28 volt stand-off.
See table that follows for channel selection definitions.
17
Transmit
Audio
Audio signal input to the radio when transmit operation is
active. Signal exhibits a 10 K Ohm input impedance. An 80 mvolt
RMS input produces approximately 60% rated deviation for input
frequencies from 300 to 3000 Hz.
18
Ground
See “Ground” description above.
19
Channel
Select 0
See “Channel Select 2” description above.
20
+13.6 VDC
+13.6 VDC power input to the EIC. This power is utilized for
external interface logic only and is wholly isolated from the
primary input power to the STR-1700.
21
Ground
See “Ground” description above.
22
+13.6 VDC
See “+13.6 VDC” description above.
23
Channel
Select 1
See “Channel Select 2” description above.
Pins not listed within this table are all defined as no connects.
When the “Power On/Off Control” signal is momentarily connected to “Radio Ground” and
then released, it causes the power on/off state of the STR-1700 to toggle. This can be
utilized in conjunction with the “Radio +5 VDC” signal to insure the STR-1700 is
powered on for operation. Note that STR-1700 units will maintain the power on/off
state across removal of the primary power to the radio. As such, users need not
utilize this control signal but may simply always leave the STR-1700 in a powered on
state. When delivered from the factory, STR-1700 units are left in a power on state.