Installing the Station Transponder Units on Site
122
Setting Station Transponder Unit Levels for a Radio-based System
It may turn out that the factory default settings on the Station Transponder Units in your
system are adequate and you do not need to do any adjustments in order to get adequate
audio levels from the radio receivers. If you do need to make level adjustments at the
individual stations, the procedure which follows will provide uniform levels compatible
with most PA systems.
♦
Setting the Station Transponder Unit Levels for Radio
1. Attach the oscilloscope probe to
R149
(near J4-pin3) on the transponder board of
the unit being adjusted. Attach the ground lead to
R148
.
2. Confirm that the receive audio level coming from the radio is nominally 0.4 Vp-p,
with the peak audio level no more than 1.0 Vp-p. If necessary, adjust the controls
in the radio receiver to get the audio within this range.
3. Attach the oscilloscope probe to
R134
(near relay K2) on the transponder board of
the unit being adjusted. Attach the ground lead to
R133
.
4. From an FSA Console position, select the target Station Transponder Unit and
send it an Alert. While the alert tones are being played at the unit, use the
TONE
control (
R61
) to adjust the peak tone level to 2.2 Vp-p (0 dBm). (The tone levels
can be readjusted later with
R61
, if necessary.)
5. Clear the
Alert
at the FSA Console position and set the
VOICE
control (
R87
) to
approximately the 1/4 CW (clockwise) position. (1/4 of its range from fully CCW)
6. At the console position, select
Alert with PA
for the target Station Transponder
Unit. When the alert ends and the operator starts speaking in a normal voice, adjust
the
AUX RX
control (
R137
) for the knee of compression at
R134
. (approximately
0.4 Vp-p) (The voice levels can be readjusted later with
R137
, if necessary.)
7. At the console position, select
Alert with PA
for the target IP station transponder.
When the alert ends and the dispatch operator starts speaking in a normal voice,
adjust the Voice Control
R87
for a 2.2 Vp-p (0dBm) level at
R134
.
8. At the console position, have the operator clear the
Alert with PA
for the target
Station Transponder Unit.
9. (MIC Level - for handset option only) At the station unit, move the oscilloscope
probe to
R139
on the transponder board (close to J4-pin 11). Lift the handset, press
Note
The following procedure assumes two things: 1) the radio receiver
is the only source of voice audio supplied to the Station
Transponder Unit, and 2) that there is an external PA amplifier
between the Station Transponder Unit and the loud speakers in the
station.
Tip
The following steps are only necessary if your Station Transponder
Unit has a handset. If you do not have a handset, the following 9
through 12 are unnecessary and you may skip to step 13 to finish
the procedure.
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 ...
