JETStream jt270m User Manual page 11

internal speaker is muted when an earphone or
external speaker is connected to this jack
Antenna: The SO-239 mount connection is on the left
of the rear panel of the transceiver. The antenna
system is composed of an antenna, feedline, and
ground network components. Carefully consider your
antenna system installation for best results with this
transceiver. For instance, be sure the antenna you will
use matches your desired operating frequencies.
Selecting an appropriate antenna is beyond the scope
of this manual. Do not transmit without first
connecting an antenna. Doing so may damage the
transceiver.
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