30 Supported Features
4.27 External Speaker
The Consolette supports connection on its rear panel to the 8-ohm mobile speaker. The mobile
speaker cable must be modified in order to connect to the 14-pin terminal connector, J103 pins 1
(EXT_SPKR+) and 2 (EXT_SPKR-).
NOTE: EXT_SPKR- and EXT_SPKR+ should never be grounded. If they are grounded, this will
damage the radio.
This speaker provides receive audio and alert tones but not transmit audio. The speaker may be
configured using APX CPS to either maintain a fixed volume, or to track the O5 volume knob.
Additionally, there is an external speaker active output which indicates when the external speaker
is unmuted. EXT_SPKR_ACTIVITY (driven low when valid audio activity is present on the
secondary speaker) is located on the DB25 Accessories Connector J104 pin 23.
The normal operation of the external speaker can be configured to be overridden by:
• connection of a Headset to the Consolette when tracking local speaker.
• activation of the MUTE_IN signal to the rear of the Consolette.
• activation of the Speaker Mute Button from the front panel when tracking local speaker.
4.28 Audio Jack
The Consolette supports a dedicated connection for use with a powered speaker or a computer
soundcard input. This output is a fixed level “line out” audio output at a nominal 300mVrms. This
audio includes receive audio and alert tones (no transmit audio). When there is no valid audio, this
audio path is muted.
NOTE: Refer to the external equipment’s manual to ensure its maximum input audio specification
is not exceeded.
The connection is a dedicated 3.5 mm audio jack provided at the rear panel of the Consolette. A
three-conductor 3.5 mm TRS (tip, ring, sleeve) connector or stereo plug should be used in
conjunction with this jack. The Consolette does not provide a true stereo output at this jack;
however, the same receive audio and alert tones are supplied to both the right and left speaker
connections.
4.29 Crossmute Operation
The Consolette supports a Crossmute Interface on the DB25 connector on the rear panel.
Crossmute allows an automated method of muting a Consolette while a second Consolette in
close proximity is transmitting. This prevents noise due to RF desense from being heard on the
speakers of the nearby, non-transmitting units.
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