STR-1000 User Guide
Sandia Research Corporation
Page
15
of
17
Figure 13. Mute status on display.
Receive audio will always be available on the Smart Handset speaker. At times, it may be useful
to have audio also come out of the built in speaker on the body of the radio. To change the
speaker function, press had hold the F1 function key until the display beeps and turns off or turns
on the speaker as desired. Figure 7 shows the location of the speaker icon – when visible the
speaker on the body of the radio is active, if the speaker icon is not visible then the audio will
only be in the Smart Handset.
If the received signal strength is very low, “opening” or turning off the mute may allow
successful communications that might be “clipped” or interrupted or not received at all with the
mute function active. This is often the case when approaching the limit of a particular
transmission path for a given frequency and antenna combination.
8. Backpack
The STR-1000 is supplied with a backpack for carrying the radio and storing the antennas not in
use. On the surface or in large passages underground, the pack may be worn in the normal
fashion on the back. Underground in smaller passages, wearing the pack on the front of the body
will allow the user to crawl on hands and knees without having the pack drag or get stuck on the
ceiling of the passage. In even smaller passages, the pack may be taken off and pushed along the
travel route as the user belly crawls through the passage.
The pack has access holes to either side of the top carrying handle which provide access to pass
the Smart Handset cord and the antenna through to the radio (Figure 14). This will allow the
pack zippers to remain closed during travel.
During extended transmit conditions or excessive heat conditions, the pack zipper should be
opened to allow air to circulate, cooling the radio case. In case of excess heat which may cause
the radio to self protect (not transmit), remove the radio from the backpack to increase the
cooling circulation.
