User's Manual Part 2
Table Of Contents
- Maintenance
- Introduction
- Scheduled Maintenance
- Unscheduled Maintenance
- Introduction
- Tools, Materials and Test Equipment Required
- T6T VHF Amplifier Procedures
- Top and Bottom Covers
- Removing and Refitting the Interface Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Power Supply Modules
- Removing and Refitting the Combiner BIT Module
- Removing and Refitting the PA Modules
- Removing and Refitting the Front Panel PCB
- Removing and Refitting the Cooling Fans
- T6T VHF Drive Assembly Procedures
- Removing the Top Cover
- Removing and Refitting the Processor Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Drive Module
- Removing the Bottom Cover
- Removing and Refitting the PA Control Module
- Removing and Refitting the Power Supply
- Removing and Refitting the Front Panel PCB
- Virtual Front Panel (VFP)
T6T 300 Watt VHF Transmitter Page 95 Installation
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 shown below and detailed in Table 24.
Table 24 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 LCD. 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 maximum,
configurable normally open or normally closed. 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 28 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
maximum, configurable normally open or normally closed.
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.
18
915
Pin-out of Facilities connector looking into the mating face of
the chassis mounted socket.
A suitable free plug is detailed in Table 14 on page 70.