Entering Password; Align" Menu; Low-Power Adjustment; Table 9 Alignment Mode Frequencies - Motorola Spectra Service Manual

3. Exit the RAC Menu:
After editing the repeater names and IDs, scroll
through the repeater list by pressing Mode until "EXIT"
is shown on the display. Press HOME to return to the
"RADIO" display. Press Mode again to return to normal
radio operation.

XVI. ENTERING PASSWORD

To enter TST FREQ, CH TEST, or ALIGN menus, a
password will be requested before you can actually
enter those modes. To get to these menus, proceed
as you would to enter the "MODE" menu (see para-
graph II). With "MODE" displayed, press Mode to scroll
to the "TST FREQ", "CH TEST", or "ALIGN". Press
HOME; the display shows "PSWD_ _ _ _" and the first
space after "PSWD" blinks. Press VOL and Mode but-
tons (or keypad, if present) to enter the password.
The password defaults to the last four digits of the
radio's serial number. However, the password may
be changed, and all front panel programming dis-
abled, with the radio service software package.
Press HOME to enter the password. If you fail to
correctly enter the password, the previous display
returns, and you must press HOME again and reenter
the password correctly. If another attempt fails, turn off
the radio to exit, and reenter the front panel program-
ming mode, this time noting the correct final four digits
of the serial number.
If the password has been changed, obtain the new
password from your supervisor.
XVII. "ALIGN" MENU
The "ALIGN" menu requires entry of the password
number (see paragraph XVI.); however, if entered once
for test mode or control head test, a password entry is
not required again.
For trunked radios, place the microphone in the
hangup clip (grounded) while in the "ALIGN" menu to
unsquelch the radio and allow receiver measure-
ments to be made.
The parameters that can be aligned in this mode
are transmit power out, reference oscillator warp, and
deviation.
Press Mode to scroll through these menu
choices:
1. Select "LO POWER" for front panel low-level trans-
mit power output adjustment.
2. Select "HI POWER" for front panel high-level (rated)
transmit power output adjustment.
NOTE
NOTE
NOTE
3. Select "REF OSC" for front panel reference oscilla-
tor frequency adjustment.
4. Select "DEV" for front panel transmitter deviation
adjustment.
5. Select "EXIT" to return to the "ALIGN" display.
XVIII. LOW-POWER ADJUSTMENT
CAUTION
The radio transmit power is adjusted and tested
at the factory under tightly controlled conditions
with the most accurate test equipment available
and should rarely require field adjustment.
Each radio is set to the proper output level
while connected to an accurate 50-ohm load
impedance. Once the power level has been
set, the internal power control/protection circuit-
ry will reduce the power output whenever a load
impedance significantly different from 50 ohms
is sensed. If adjustment is required, be sure
the load impedance is as close as possible to
50 ohms to ensure proper radio operation. Set-
ting power to a level higher than rated power
will reduce radio lifetime, and adds no percepti-
ble improvement in system performance.
With "LO POWER" displayed, press HOME to enter
the adjustment mode.
"LO 1 XXX," where the "1" represents the applicable
test mode transmit frequency (see Table 9. Alignment
Mode Frequencies) to be used, and "XXX" represents
the current low-level transmit power output setting in
radio memory. There is no direct correlation between
the value of "XXX" and the actual power in watts; how-
ever, the power level increases with the "XXX" value.
Press Mode up to change to "L03XXX", which is the
highest test frequency.
Table 9. Alignment Mode Frequencies
Test Frequency Receive Frequency
First 935.0125 MHz
Second 938.0000 MHz
Third 940.9625 MHz
When setting or measuring RF power at 900 MHz,
you must follow these guidelines to avoid measurement
errors due to cable losses or non-50-ohm connector
VSWR:
1. All cables should be very short and have Teflon
dielectric.
2. Attenuators and 50-ohm loads should have at least
25dB return loss.
3. Mini UHF-to-N adapter 58-80367B21 can be used
at the antenna connector. All other connectors
should be N-type. No other adapters, barrel connec-
tors, etc., should be used.
The display will show
Transmit Frequency
896.0125 MHz
901.9875 MHz
940.9875 MHz
25