User's Manual

Page 46
M Series Data Radio – User Manual
© Copyright 2004 Trio DataCom Pty. Ltd.
Part H – TVIEW+ Management Suite - Programmer
two methods for setting the power.
• Using Factory Calibration
To use the factory calibration of the radio the desired power is set
immediately using the OK button in the dialogue box. This
method permits the transmit power to be set without energising
the transmitter. Note that although the transmit power has been
adjusted it must be written to the unit using the “Write” function to
ensure it is retained after a power on reset.
• Using a Power Meter
To overcome manufacturing variations in the power setting a
more accurate setting of power can be achieved by the selecting
the “Test With Meter” button in the dialogue box. This displays
another dialogue box warning the user that the transmitter is about
to be energised and that the power meter used should be able to
handle at least 10 Watts from the modem.
Selecting OK in this warning dialogue box will energise the
transmitter which will also be indicated by the red transmit LED
on the unit. The power is adjusted using the up/down keys until
the required power level is obtained. Selecting OK will retain the
power setting and turn the transmitter off.
Note: Although the transmit power has been adjusted it must be
written to the unit using the modem “Write” function to ensure it
is retained after the unit is rebooted.
Selecting “stop test” will stop and leave you in power adjust
box. “Cancel” will stop test and take you back to the main
window.
Receiver
The receiver can be configured for receive frequency and mute level.
Frequency
The required receive frequency in MHz can be entered in the display
field. The programmer checks that the selected frequency is in the
range for the particular model of radio and provides warnings if not.
Mute Adjust
The currently selected mute level is displayed in the main window
below the button in dBm. The mute level can be adjusted by selecting
this button which displays a dialogue box. The up/down keys, or a
typed in value, can be used to select the required mute level in dBm
steps. Whilst a session is in progress with a unit the mute level
adjustment is live. Selecting OK will retain the mute level setting. Note
that although the mute level has been adjusted it must be written to the
unit using the “Write” function to ensure it is retained after the unit is
rebooted.
The mute level should be set to assist the unit in filtering out unwanted
signals. Unwanted signals can be the result of background noise or
interference. The mute level should be set at a level above these
unwanted signals and at a level low enough to detect the wanted
signal. Detection of a received signal above the mute level is indicated
by the “RxSig” LED on the unit.
Due to normal manufacturing variations the actual mute level may
vary by several dBm to that selected. If a more accurate adjustment
is required an unmodulated signal of the correct frequency and desired
threshold level can be applied to the radio modem’s antenna connector.
Modulation
The currently selected modulation scheme is displayed in the main
window below the select button. The modulation scheme can be
adjusted by selecting this button which displays a dialogue box. The
desired modulation scheme can then be selected from the pull-down
menu in the dialogue box and retained using the OK button. Please
select the modulation scheme as directed by your license conditions
or suggested by your local regulatory authority.