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if you choose to not enter your specific MMSI number at initial start up, you can still use
many of your radio's features. However, you cannot use DSC features.
SETTING IT UP
Even though you can change your radio's settings at any time, you will probably want to
establish initial settings when you turn it on for the first time. You can adjust some of these
settings on an as-needed basis, but some settings might only be set once and not need
adjustment at all.
Acquiring GPS Location
The MHS335BT automatically acquires your current GPS location when it is turned on.
Turn on the radio and point the antenna towards the sky. It will triangulate your location and
save it.
NOTE: Do not let anything obstruct the antenna, such as a metal cabin ceiling. If the radio displays
an Unable to Aquire message, move to an unobstructed location for the antenna.
Changing the Volume
To change the speaker volume, press VOL/SQ to enter Volume Setting mode. Press ▲ to
increase the volume or ▼ to decrease it (Volume levels = 0 - 15).
Setting the Squelch Level
The MHS335BT recognizes signals as transmissions if they exceed a signal strength
threshold. Adjusting the squelch sets this threshold level. Increasing squelch requires a
signal to be stronger to be seen as a transmission. If you set the squelch too high, you
will risk not receiving transmissions that are lower than that threshold. Reducing the
squelch allows weaker signals to be accepted. However, if you lower the squelch too
much, you will hear white noise all the time.
The squelch feature reduces static on the speaker by filtering out any background
channel noise. At the lowest squelch level, the speaker plays all signals, including any
channel noise. Setting the squelch level higher filters out noise and lets only actual radio
transmissions through.
While listening to a channel, press and hold VOL/SQ to enter Squelch Setting mode. Press
▲ to increase the volume or ▼ to decrease it (Squelch levels = 0 - 15). The following
graphic shows squelch set high enough that only the strongest signals get through.
NOTE: Setting the squelch level too high may prevent you from hearing weaker transmissions. If
you are having difficulty hearing a transmission, try setting the squelch level lower.
STRONG SIG.
MEDIUM SIG.
WEAK SIG.
OPEN
Uniden MHS335 Radio Owner's Manual
E-25
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