STR-1000 User Guide
Sandia Research Corporation
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Figure 12. Antenna Status showing Tuned with a good SWR.
If the Antenna Status shows “Tune Failed” or a SWR value over 2.0, then selecting a different
antenna length (from the table in Section 5 above) or re-orienting the antenna may allow it to
tune properly.
When operating in the underground environment or on the surface with changing operating
conditions (people or vehicles moving close to the antenna, different location, etc.) the tuning of
the antenna may change and require a new manual tune sequence.
The Automatic Tuner Unit also senses the conditions that the antenna is operating in during
transmissions and will initiate an automatic re-tune sequence if needed. During a tuning or re-
tuning sequence (clicking heard inside the radio) voice transmissions are not possible. Allow the
sequence to finish before initiating a call.
7. Speakers and Mute
The audio from the receiver may be muted to reduce the background “hiss” on the open channel.
To change the status of the Mute, press the F1 function key. The display will change to either a
normal or inverted “V” (for voice) character, at the upper center of the Smart Handset display.
