User`s manual

Tracker3 User’s Manual 14
10.2. Radio Configuration
Two special commands are available from the T3-301’s command line for setting
the radio frequency and power:
SETFREQ ttt.ttt rrr.rrr sets the transmit frequency (ttt.ttt) and receive frequency
(rrr.rrr) in MHz. Note that the frequencies must be entered in exactly the format
specified, e.g. “SETFREQ 144.390 144.390”.
SETPOWER <1-5> sets the transmitter power (approximately) in watts. Note
that older radios originally shipped with a Tracker2 board may require an
alternate form of the command, SETPOWER <00-99>, due to variations in the
radio module’s firmware. In this form, 00 is minimum power and 99 is
maximum power on a non-linear scale.
These settings are passed from the tracker to the radio’s controller, and are
retained by the radio, not the tracker. They are unaffected by profile switching.
They may, however, be changed using EXEC script commands. Use caution
when setting parameters using a script – each command may cause an erase and
rewrite of nonvolatile memory in the radio module, and the memory will
eventually wear out after many thousands of cycles.
The default settings are 144.390 MHz for transmit and receive, with a power
output of 5 watts. Deviation (set using the tracker’s TX level option) is pre-set to
approximately 3.4 kHz. You may wish to make a note of this level in case you
need to restore default settings.
For detailed radio tuning and diagnostic information, see the FC-301/D service
manual on our website at www.argentdata.com.
The T3-301 module uses M2.5 size screws for mounting.