User Manual

Vytek PTX-150
Doc Ref : 7M393-1 Version C1 Page : 9
 VYTEK - 2000
4. CONNECTION TO NETWORK
CONNECTION
Once the transmitter has been configured for the network, it is now necessary to install
the unit into the station and interface to the LIU (Line Interface Unit).
• Verify that the antenna lead is connected to the station antenna. Install a Thruline
Wattmeter in series with the transmitter and antenna lead.
• If a PSTN connection and dial Modem are available, install the dial modem and
connect it to the dial Modem port (on the rear of the transmitter). Use a standard DCE
to DTE RS232 interface cable (usually supplied with the dial modem).
• If an external frequency reference is used, select that option in software and connect
the source via a 50Ω coaxial cable and BNC male plug to the BNC socket at the rear
of the transmitter.
• Identify the appropriate data, clock and mode control connections from the LIU and
connect them to the appropriate pins on the DB37 connector at the rear of the
transmitter. The correct connections will vary depending upon the LIU used and the
mode of operation. Refer to Table 4.0.1 of pin outs for the DB37 connector.
PIN No. LIU Name FUNCTION
1 PR0 Protocol select line
5 CH4 Frequency select line
6 CH3 Frequency select line
7 CH2 Frequency select line
8 CH1 Frequency select line
11 KEY Transmitter key
15 LB TX DATA, TTL (L-Bit)
16 HB TX DATA, TTL (H-Bit, 4-level)
18 CLK Clock for synchronization data
19 GND Ground
21 ALM10 Reflected power alarm 2 (not used)
22 ALM11 Output power high alarm
23 ALM12 Output power alarm 2 (not used)
26 ALM3 TX Synthesizer alarm
29 ALM6 Output power low alarm 1
30 ALM7 Reflected power alarm 1
31 ALM8 Fan alarm
Table 4.0.1 List of the DB37 connector pins.
• Determine if PTT control is via the DB37 connector or will have to be automatic upon
the detection of data.
• If desired, check the setting for the transmitter Hang Time (time that transmitter stays
keyed on after the last data transition has occurred on the TX DATA TTL [Lbit] pin).
This function can be altered in software.
• Connect AC power to the transmitter and note that the appropriate test cycle occurs.
The transmitter is now ready to operate.