129
MAP27 Wireless Interface Option
There are no audio gain adjustments in the Map27 wireless interface module, audio
always passes straight through the WIM.
Required Tools
• A PC or laptop with a serial port and Windows XP
• Zetron M827Base for Windows (version 3.60.146 or later)
• Serial cable (straight-through serial extension cable)
• Small flat bladed screw driver to adjust gain pots on front of MAP27 card
(0.12” max blade width)
• At least one configured MAP27 radio that can be connected
• A digital voltmeter able to read low AC sine wave levels (about 77 mV RMS)
M427 to Console Audio Level Adjustment
This procedure causes the M427 to output a test tone so that the Rx gain at the MAP27
channel card can be adjusted. The
Fluke 189 True RMS (Digital) Multimeter
or equivalent
device has the accuracy required for the measurements in this procedure. An oscilloscope
can also be used to perform this test, provided it has sufficient accuracy to measure such
small audio signal levels.
1. Connect the
COM1
serial port on the PC or laptop to the M427 front panel serial
port using a straight cable.
2. Start the Zetron utility program
M827Base
.
3. Click
FILE
,
CONNECT
,
SITE LIST
,
CONNECT
in order to select the
Communications Utility
and connect to the M427 being setup.
4. Once connected, click
TELCO LEVELS
,
LINE
,
AUDIO TO PHONE
in order
to select the
LEVELS
menu and navigate to the dialog that outputs a tone.
5. Set the M427 output slider level to
28
.
6. Click the
ON
radio button to turn on the test tone.
7. At the S4000 MAP27 channel card, connect the AC meter to the front panel
RX
and
GND
test points.
8. At the S4000 MAP27 channel card, adjust the 4-wire
RX
pot until the meter reads
245 mV (= -10 dBu). 245mV is a RMS level which corresponds to -10 dBu for sine
waves. For sine waves the "peak to peak" level is 2.825 times higher than the RMS
level, so it would be 692 millivolt peak to peak for -10 dBu (= about 700 mVpp).
9. Click
OFF
at the PC to turn off the test tone.
10. Close the
Levels
menu.
11. Click
FILE
,
DISCONNECT
.
12. Close the
M827Base
program.
This completes the M427 to console audio level adjustment. The Rx level now set should
be such that a sine wave 60% radio channel deviation causes a -20 dBu level (77 mV
RMS) at the MAP27 Rx test point. This is the same Rx level as the dual channel card
audio level setup (see
Содержание 4000 Series
Страница 1: ...Series 4000 Communication Control System Installation and Configuration 025 9533Y...
Страница 6: ...6 025 9533Y...
Страница 28: ...Introduction 28 025 9533Y...
Страница 88: ...Common Control Equipment Installation 88 025 9533Y Figure 22 Console Duplex Wall Jacks...
Страница 110: ...Common Control Equipment Installation 110 025 9533Y...
Страница 172: ...Console Installation 172 025 9533Y...
Страница 192: ...Audio Level Adjustments 192 025 9533Y...
Страница 230: ...Accessory Installation 230 025 9533Y...
Страница 236: ...Console ANI Programming 236 025 9533Y...
Страница 339: ...339 RSMP Operation Figure 99 Main Screen...
Страница 350: ...Radio System Management Program 350 025 9533Y...
Страница 362: ...Appendix B Troubleshooting 362 025 9533Y...
Страница 417: ...417 Index wiring accessories 164 wall jack 86 wiring diagram for M4219 244 X XMT button labels 332 XP settings 247...
Страница 418: ...Index 418 025 9533Y...