Specifications
REPEATER PERSONALITY
It may be necessary to reprogram the personality of the
MASTR III or IIe repeater. Refer to TQ-3353 (Version 9.0
or later). Select “GETC” from the Control Screen to access
the GETC Data Screen.
Follow the instructions for making a change to the
Current Personalities Screen and select the CNI field.
Setting the field selection to YES disables the High Speed
Data audio routing and routes the Channel Guard tones to
and from the CNI GETC.
Use the procedures described in TQ-3353 and download
the revised personality data into the MASTR III or IIe
repeater.
DIP SWITCH SETTINGS
Three DIP switches on the GETC Logic Board must be
properly set for CNI operation. S1-1 thru S1-7 and S2-1
thru S2-4 set the CNI’s transmitting frequency for MASTR
II and IIe repeaters. S3-1 through S3-5 select the channel
number which is normally set to Channel One.
Set the GETC DIP switches using the following
procedures (refer to Figure 11):
1. Set S1-1 thru S1-7 and S2-1 thru S2-4 to the
repeater’s operating frequency (except MASTR
III). Refer to the Station GETC manual, LBI-
38988, for the DIP switch settings which
correspond to the operating frequency.
2. Set S1-8 to the Closed position (not used).
3. Set S2-5 to the Closed position (Conventional
Failsoft enabled).
4. Set S2-6 thru S2-8 to the Closed position.
5. Set S3-1 to Open and S3-2 thru S3-5 to the Closed
position. This sets the CNI GETC for operation on
channel number 1.
6. Set S3-6 thru S3-8 to the Closed position. This
sets the GETC to the normal trunked message
mode.
MODEM ALIGNMENT
Use the following steps to set up the basic audio line
levels. If the CNI GETC is linked to a multisite system
other than the CEC/IMC (i.e. Data Gateway), different
levels may be required. Consult the applicable system
installation manual for the required levels.
1. Ensure jumpers are installed on J11 and J12 pins 1
& 2.
2. Apply power to the GETC.
3. Adjust the receive level by monitoring U18 pin 1
(refer to Figure 12) and adjusting the receive level
potentiometer R1 (located on the GETC Logic
Board) for 400 mVpp as measured with an
oscilloscope (85 mVrms if using an RMS
Voltmeter).
4. Verify the presence of demodulated signal data at
monitor jumper wire for MASTR II or IIe.
5. Adjust the transmit level potentiometer R2 for the
maximum output level allowed by the phone line,
microwave link, or equivalent communication line.
For telephone lines linking the CNI GETC to the
CEC/IMC Uplink GETC, adjust R2 for .77 Vrms
(0 dBm) measured across J6-8 and J6-9 (TB10-1
and 2). For microwave links, adjust R2 for -10
dBm across J6-8 and J6-9.
6. Initialize the modem by pressing S4 (on the GETC
Logic Board) to reset the CNI GETC or cycle the
GETC Shelf’s operating power.
7. Verify proper modem initialization and operation
by observing the CNI GETC front panel LED’s.
Proper operation is indicated by illuminating LED
indicator L1.
Be sure the DIP switch settings correspond to the
Personality data created.
NOTE
In MASTR III repeaters the operating frequency is
programmed directly into the MASTR III’s
personality. Set S1-1 thru S1-7 and S2-1 thru S2-4 to
the Closed position.
NOTE
Figure 11 - CNI GETC Switch Settings
LBI-38986
17