MITSUBISHI ELECTRONICS AMERICA, INC.
ST200 Series Technical Support Manual
29
January 2000
♦
Background noise at either the MT end or the other user end may couple into the
communications link if at a high enough volume. Background noise may sound like garble
or be misconstrued as cross-talk or echo by the MT or PSTN end-users. Since the MT is
voice activated, this “garble” would only come through when the MT user is speaking.
♦
Signal propagation to and from the satellite inserts a noticeable delay into voice
communications. This delay is approximately 400 milliseconds from the time one party
speaks until the other party receives audio. For short question and answer type
communications the two-way delay is close to a one second, round trip from one speakers
perspective, without considering the time it takes a speaker to formulate their response.
Although this delay is noticeable, user expectations and discipline can easily overcome the
issue. Dealers should be familiar with this delay and help set customer expectations. The
propagation and processing delay should have little or no user impact on digital dispatch
(since it is half-duplex), data communications, or facsimile services.
♦
All Mitsubishi MTs are single channel communications devices. Users cannot switch
between handsets and data equipment while actively engaged in calls.
OmniQuest® Battery
•
The length of standby time possible on the internal battery depends upon the specific
configuration settings of the MT for Backlight Mode Selection (FCN52) and Sleep Mode
(FCN 54). The general relationship of standby time to these settings is shown below (setting
Auto Power Off (FCN53) to Enable will also affect overall battery time):
SLEEP MODE (FCN 54)
BACK LIGHT MODE (FCN52)
STANDBY TIME*
Enable
OFF
8 hrs.
Enable
10 sec
will vary
Enable
ON
4 hrs.
Disable
OFF
4.5 hrs.
Disable
10 sec
will vary
Disable
ON
3.5 hrs.
*
Using NiMH battery @25
o
C and beginning of battery life
•
The optimal storage temperature of 25
o
C results in a discharge rate of roughly 60% per
month for the internal NiMH battery. Therefore, a battery which has been on the shelf for
one month should provide ~ 36 minutes of transmit time which would then degrade to ~ 22
minutes after two months of storage.
6.0 Installation
The installation of a Mitsubishi MT is simple, however, performing a correct installation is
extremely important.
Mitsubishi Electronics cannot offer rules or step-by-step procedures for every variation in site
conditions and customer requirements. However, MT configurations allow significant
