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Ext In ter com Switch, Level Con trol, and In -
di ca tor: This switch en ables the wired in ter -
com in ter face when "IN", and dis ables it when
"OUT". For RTS in ter coms, the "IN" po si tion
is chan nel A and the "OUT" po si tion is chan -
nel B. A screw driver ad just able con trol is pro -
vided to con trol the in put level of the wired
in ter com.
Aux il iary Au dio En able Switch, Level Con -
trol, and In di ca tor: The switch en ables and
dis ables the Aux il iary in ter face when "IN" and
"OUT", re spec tively. The func tion of the level
con trol here is the same as that de scribed for
the in ter com.
REAR PANEL (Re fer to Fig ure 4)
Trans mit and Re ceive An tenna Con nec tors:
At tach 5/8-wave an tennas (sup plied) to these
con nec tors. An tenna color should match the
con nec tor color dot.
Trans mit Switch: Slide switch that al lows the
op er a tor to se lect one of three trans mit modes.
In the "OFF" po si tion, the trans mit ter is al ways
off. This mode may be used if the base is func -
tion ing solely as a mon i tor. In the "CONT" po -
si tion, the trans mit ter is al ways on. This
con tin u ous mode is rec om mended over the
"RE MOTE" mode. In the "RE MOTE" po si -
tion, the trans mit ter is en abled only when one
or more portables are ac tive.
Head set Mi cro phone Se lect Switch:This
switch al lows the user to se lect ei ther an
Electret or Dy namic mi cro phone.
In ter com Con nec tors: Con nec tions to in ter -
face the BTR-300 with a wired in ter com sys -
tem.
Aux il iary Out put/In put Con nec tors: Can be
used for 2-way (four wire) in put and out put to
the BTR-300 or as a sim plex in put or out put.
Typ i cal uses are 4 wire low level in ter com's,
tape re cord ers, pub lic ad dress in puts or out -
puts, or when op er at ing two BTR-300 units si -
mul ta neously.
Power Jack: For ex ter nal AC wall sup ply
adap tor (sup plied) or any fil tered 12 to 14
VDC/600 mA source, or 13.0 VAC RMS/600
mA source.
Speaker Jack: Al lows the user to con nect an
ex ter nal speaker (8 ohms min i mum) to the unit.
Speaker Gain Con trol: Screw driver ad just -
able. Ad just the gain con trol clock wise to in -
crease speaker gain or coun ter clock wise to
de crease speaker gain.
NOTE: Leave set ting coun ter clock wise if no
speaker is at tached.
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