T6T VHF 100 W Transmitter
Page 20
Installation
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Facilities Connector
The Facilities connector is a 15-way D-type filtered socket used for connecting to associated parts of a
system. The connector pin-out is detailed in Table 11.
Table 11 Facilities Connector
Pin Number
Signal
Characteristic
1
Ground
0 V.
2
E-BIT (input)
An external BIT input that connects from any ancillary equipment
having a compatible BIT alarm output.
When this input is active, the transmitter’s front panel Alarm indicator
flashes and an E-BIT message is displayed on the display. The input is
TTL having a 4.7 kohm pull-up resistor to 5 V. The input is
configurable from the front panel to be active high or low.
3
PTT output
Grounding solid state relay. +60 to -60 V, ac or dc, 100 mA max,
configurable n/o or n/c. Activated 35 ms (±1 ms) before the start of the
power ramp up to allow for the antenna relay pull-in time.
4
External VSWR input
Used to indicate an external VSWR fault. TTL input with 4.7 kohm pull-
up to 5 V. Configurable active high or low.
5
6
Antenna change-over
(output)
Antenna change-over
common (output)
Solid state relay linked to pin 6. See
Fig 11
for further detail.
Solid state relay linked to pin 5.
7
Not used
-
8
Ground
0 V.
9
Output supply
This output is between 21.6 and 32 Vdc (nominally 28 V) fused at
500 mA.
10
Inhibit (input)
Active signal prevents the transmitter keying. TTL with 4.7 kohm pull-
up to 5 V. Configurable active high or low.
11
BIT interruptive test
(input)
Active signal initiates a BIT test. TTL with 4.7 kohm pull-up to 5 V.
Configurable active high or low. Must be asserted for >300 ms.
12
Not used
-
13
Ready (output)
An output that is active when the radio is ready to transmit and no
faults are detected. Open collector NPN transistor grounding output,
200 mA max, configurable n/o or n/c.
14
Tape (output)
An audio output for connection to a recording system. 0 dBm fixed
output into 600 ohm for 90% modulation depth.
15
Reserved (output)
Do not connect to pin 15 unless advised to do so by Park Air.
1
8
9
15
Pin-out of Facilities connector looking into the mating face of
the chassis mounted socket.
A suitable free socket is detailed in
Table 2 on page 3
.
Summary of Contents for T6T
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