ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
6-4
November 1999
Part No. 001-7780-500
Figure 6-3 Connecting DC Power
6.1.6 REMOVING TRANSCEIVERCOVER
NOTE: The transceiver cover needs to be removed
only if the frequency and squelch adjustments
described in Sections 6.2.1 and6.6 need to be reset.
The frequency and squelch noiselevel adjust-
ments are made by manually resetting controls on the
RF board. Toaccess these controls, proceed as
follows:
1. Remove the battery, belt clip, and ba ck cover as
described in Section 1.11.
2. An externalpower supply must then be connected to
the transceiver as shown in Fi gure 6-3.
6.2 TRANSMIT FREQUENCY AND POWER
6.2.1 FREQUENCY ADJUSTMENT
Frequency adjustment should be performedwith
the ambient temperature nearthe TCXO calibration
reference of 77° F (25° C). This ensures that the
frequency will be within tole rance at the temperature
extremes. Proceed as follows:
NOTE: The transmitter immediately keys when the
following function is selected. To turn the transmitter
on and off, click the “Toggle”button (see screen
which follows).
1. Connect a wattmeter and dummy load to the antenna
jack as shown in Figure 6-1.
2. Click the “Complete Tune”button to automatically
go from one adjustment to the next or click the
“Tune” button in the “TxPower” box to perform
only this adjustment.
3. Monitor the transmit frequency with a communica-
tions monitor set to the frequency displayed on the
screen.
4. At room temperature, this frequency should be
within± 400 Hz. If readjustment is required, remove
the cover as described in Section6.1.6 and adjust
R73 (see Figure 6-3)f orthe correct frequency. This
also adjusts the receive frequency.
Transmit PowerAdjustment Screen
6.2.2 POWER OUTPUT ADJUSTMENT
Set the high and low poweroutput by clicking the
arrows or moving the button in the scroll bar.The rela-
tive power level is indicated by the number in the box.
Set the high and low power levels as follows:
High Power Level = 3.0 watts
Low Power Level =1.0watt
6.3 MODULATION BALANCE
1. If manually selecting each test, click the “Tune”
buttonin the “Modulation Balance” box. Otherwise,
this function is selectedautomatically when the
“Complete Tune” buttonis clicked.
2. Viewthe transmit modulation waveform onthe CRT
of a communication monitor.If applicable, set the
monitor for de-emphasis off, high-passfilter off,
low-pass filter3 kHz, and FM peak detection active.
7.5 VDC
Power Supply
(–) Neg
(+) Pos
R73
(Freq Adj)
R13
(Sq Lvl Adj)