135
Model 26 Backup in a Voice over Radio System
Model 26 FFSK Transmit Level
This procedure will require personnel at both the Model 26 location and at one of the
Model 6203 station locations.
♦
Setting the Model 26 FFSK transmit level:
1. At the Model 26, connect the laptop (or PC) to the serial programming port of the
Model 26. Set Switch 7 on the rear of the Model 26 to the
ON
position (places the
unit in the programming mode). Hit the
SPACE
bar three times to open the Model
26 Main menu.
2. Enter a “
7
” to open the {7} FFSK Test Menu.
3. Enter a “
1
” to initiate the FFSK test mode. The Model 26 should key its radio and
transmit for 30 seconds and then unkey. If you finish making adjustments before
30 seconds is up, you can cancel the test by hitting any character key on the
computer keyboard. If you require more time to make the adjustments, enter the
“
1
” again to repeat the test tone.
4. While the FFSK test tone is being transmitted by the Model 26, use the service
monitor to measure the deviation of its radio transmitter. Adjust the
FSK XMIT
pot (R79) on the back of the Model 26 for a deviation of 2.5 kHz (assuming wide
band and a full channel deviation of 5 kHz). If the signal cannot be set low enough,
move
JP10
in the Model 26 from position
B
to
C
. If the signal cannot be set high
enough, move
JP10
from position
B
to
A
.
5. When finished making adjustments, let the test signal time-out or stop the test.
6. Leave the laptop attached to the Model 26 and leave it in the FFSK Test menu for
now.
Tip
Do not try to set Model 26 or Model 6203 transmit or receive levels
based on FFSK packets exchanged in normal polling. To do so can
lead to erroneous level settings. Only set levels while using the test
tones generated by both units.
Caution!
Some radios exhibit a roll-off of the audio at higher
frequencies. If this roll-off is severe enough, it can compromise
the data integrity of the FFSK packets. The radios used and the
interface to them should be configured to provide a flat
frequency response (as much as possible).
!
Содержание 025-9581M
Страница 1: ...Fire Station Alerting System Installation and Maintenance 025 9581M ...
Страница 6: ...6 025 9581M ...
Страница 40: ...Creating Console Positions 40 025 9581M ...
Страница 45: ...45 Installing the VoIP Gateway Server ...
Страница 78: ...Configuring Station Transponder Units 78 025 9581M ...
Страница 124: ...Installing the Station Transponder Units on Site 124 025 9581M ...
Страница 146: ...Using a Model 26 Fire Station Dispatcher for System Backup 146 025 9581M ...
Страница 188: ...Appendix C Using a Model 620x in a Model 26 based System 188 025 9581M ...
Страница 196: ...Fire Station Alerting System Installation and Maintenance 196 025 9581M ...