Datron TW7201I, Manual

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3: Operation
TW7201I-MS 3-7
3.3 VSWR Feature
VSWR is a measurement of how much power is delivered to the antenna
system. A high VSWR reading indicates a significant impedance mismatch
between the transceiver and the antenna system. A low VSWR reading
indicates a good impedance match resulting in more power transferred to the
antenna system.
When the microphone is keyed, the LCD displays the VSWR on the second
text line (except when using ALE, TA/TC/SC and tune). If there is adequate
power transfer from the radio to accurately measure VSWR and VSWR is less
than 9:1, the LCD displays
VSWR n-1
, where n is the ratio n:1. If the ratio is
9:1 or higher, the LCD displays
VSWR 9+
. If the power out is too low for a
reliable determination of VSWR, the LCD displays
VSWR ----
.
Modes USB/LSB DATA are not available for selection unless the 5 MHz IF
board includes the 7000WB1 or 7000CW options.
Note:
The VSWR feature requires that firmware 701AU (or later version) and
Reference/Control board 001-00206 are installed.
3.4 Using Menus to Change Settings
The TW7000 provides two menus for adjusting settings. The Alpha menu is
for changing settings specific to the 7000TC option (Transcall, Selcall, and
TransAdapt). The Alpha menu also provides access to the ALE submenu,
which includes a set of functions for changing settings specific to the ALE
option.
To access the Alpha menu:
1. Press
ALPHA
to display the first function on the menu.
2. Press the number of the desired function.
3. Press
E
to enter the selection.
4. After selecting and entering a function, use the arrow buttons on the
keypad to scroll through any further selections within that function.
5. Press
E
to enter a selection.
For example, press
ALPHA 17
, then press
E
to access the ALE submenu.