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If power is continuously supplied to
the scanner for at least 24 hours, the
memory backup circuit maintains the
channels stored in memory for up to 5
days. If power is disconnected and the
memory backup circuit becomes too
weak to save the scanner’s program-
ming,
MEMO
LOSS
appears again
when power is reconnected until you
reprogram the scanner.
CONNECTING AN
EXTERNAL SPEAKER
OR HEADPHONES
In a noisy area, an extension speaker
or pair of monaural headphones (Cat.
No. 21-549 or 20-210) might provide
more comfortable listening. Use an 8-
ohm external speaker capable of han-
dling 3 watts of power.
Plug the speaker cable’s or head-
phones’
1
/
8
-inch plug into the
EXT SP
jack on the back of the scanner.
Caution:
Do not turn the scanner’s
volume all the way up while using
headphones. The headphones could
be damaged.
Note:
Plugging in an external speaker
or headphones disconnects the scan-
ner’s internal speaker.
Listening Safely
To protect your hearing, follow these
guidelines when you use headphones.
• Do not listen at extremely high
volume levels. Extended high-vol-
ume listening can lead to perma-
nent hearing loss.
• Set the volume to the lowest set-
ting before you begin listening.
After you begin listening, adjust
the volume to a comfortable level.
• Once you set the volume, do not
increase it. Over time, your ears
adapt to the volume level, so a
volume level that does not cause
discomfort might still damage your
hearing.
(add corrected illus F13. Add
external speaker and callout
EXT SP and arrow to jack)
20-147.fm Page 12 Tuesday, August 3, 1999 3:23 PM