4
Fig.3 Standard modem set-up
Fig.4 shows the complete system including the home-base modem.
Fig.4 System diagram. The diagram
does not include the optional DAT re-
corder
Standard Modems — Field Modem
The modem used in the field must be intelligent enough to provide
error correction, but dumb enough not to interpret any of the commu-
nication nor to add anything by sending messages to the sound level
meter (see APPENDIX 1: Selection of Field Modem).
Testing a number of modems, Brüel&Kjær has found the Multitech
MT2834ZDX to be the best choice, and recommends only that for field
use.
Brüel&Kjær does not provide technical support for other modems.
PC running
Evaluator
Type 7820
Hayes ¤ Compatible
Modem
Dumb Auto
Answer Modem
(Multitech MT 2834ZDX)
B&K 2236
or 2260
980001e
Brüel & Kjær Type 2260
0
?
dB
Microphone Extension Cable
AO 0441 (3m)
AO 0442 (10m)
Sound Level Analyzer
Type 2260
+
–
Outdoor Microphone Kit UA 1404
(Preamplifier ZG 0026 and
Microphone 4189, from 2260)
12V Battery
QB 0051
Panasonic
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grmowjgfpktjpw
Lightweight
Tripod
UA 0801
Tripod
UA 0587
Sound Level
Calibrator 4231
Mains Power Supply
ZG 0386 (EU)
ZG 0387 (UK)
ZG 0388 (US)
Mains Adaptor
(included with
Multitech Modem)
Mains Power
Evaluator 7820
Community noise
calculations
Notebook/PC
TOSHIBA
Battery Charger
ZG 0404
MT2834ZDX
Field modem
Multitech
Home-base Modem
Hayes
®
compatible
Telephone
system
Case Type 3592
970551e
Cable for
12V Supply
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