STR-1000 User Guide
Sandia Research Corporation
Page
13
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17
6. Antenna Tuning
The STR-1000 has an efficient Automatic Tuner Unit (ATU). After the desired antenna is firmly
attached to the radio body and the desired operating channel is selected, the antenna should be
“tuned”. Press the F3 function key (or the number 1 key on the keypad which says tune) and the
antenna status page will display. If the display says that the antenna is “Unturned” pressing the
PTT with a short press will initiate the tuning process (PTT tunes is also displayed on this
screen).
The display will change to state “Tuning…” and a series of clicks will be heard inside the radio,
followed by a beep. The antenna status page will change to show a number after “SWR:”. If
this number is 2.0 or less, then the tuning was completely successful and transmissions may
begin.
Figure 11. Antenna Status – Un-tuned and during Tuning.
After tuning or if the antenna was previously tuned on the frequency selected, the display will
show the antenna status as “Tuned” along with the SWR number. See Figures 11 and 12.
