LBI-33057
11
Table 3 - Maximum Transmitter Frequency Errors*
And Typical VCO Tx Tuning Voltages
CHANNEL
(
MHz
)
TOLERANCE*(Hz)
LOWEST (MHz)
HIGHEST(MHz)
VCO TUNING
VOLTAGE (TX)
485.012500
±
1213
485.011287
485.013713
1.5 Vdc
500.00000
±
1250
499.998750
500.001250
2.5 Vdc
504.987500
±
1263
504.986237
504.988763
3.5 Vdc
* Based on specified
±
2.5 ppm over the entire operating temperature range
5. Repeat the 12 dB SINAD sensitivity and distor-
tion check for the LOW and HIGH-side test
channels. See Table 2.
TRACKING AND CHANNEL DATA
The personality memory in the radio includes dis-
tinct areas which are reserved for Tracking and Channel
Data.
Tracking Data establishes individual radio parame-
ters and tailors the operation of the unit across the band.
The parameters are: high RF power, low RF power,
modulation level and receiver squelch opening. This data
is programmed into the EEPROM on the Control Board
at the factory after the front
and rear
covers are
"married". The PC Programmer allows alteration of this
data if necessary.
Channel Data is the individual channel information
such as TX and RX frequencies, CG information, CCT
information, and the four previously mentioned parame-
ters. This data is stored in the EEPROM on a per channel
basis as each channel is programmed. The PC Program-
mer allows alteration of this data on a per channel basis.
Low, middle and high-side of the band values are
programmed into the radio for each Tracking parameter.
When a channel is added to the radio, the Programmer
reads the Tracking Data stored in the radio and calcu-
lates necessary values for each parameter using a linear
interpolation technique. The Programmer then stores the
newly calculated values in the Channel Data area of
memory along with the associated channel information.
Changing the Tracking Data in the radio will not alter
Channel Data of previously programmed channels.
Tracking Data should not normally be altered; however,
it may be necessary to reprogram some of the values after
aligning circuitry, or replacing modules or other compo-
nents which obsolete the previously programmed values.
Settings for each parameter are listed in Table 4. If
Tracking Data is altered for the above reason, it will be
necessary to reprogram all channels to establish the new
default data for each channel. See the Programming
Manual for further information on altering Tracking and
Channel Data.
Digital values stored for the PWR SET analog volt-
age are one example of tracking information. As no two
transmitter stages are exactly matched, the PWR SET dc
voltage will be slightly different with any two radios to
produce the same power output. Tracking and Channel
Data allows the microprocessor to tailor the PWR SET
line for RF stage gain differences from unit-to-unit and
across the band.
Table
4 - Tracking Data Parameters
PARAMETER
FACTORY
SETTING
HEX
VALUE*
High Power
3.0 Watts
81
Low Power
1.0 Watt
3F
Modulation
±
2.4 kHz **
15
Squelch Open-
ing
8-10 dB SINAD
A3
* Listed HEX values are approximate; final pro-
grammed values will vary from unit-to-unit and will
need to be adjusted as such.
** EXT MIC HI = 1 kHz, 110 mVrms
TROUBLESHOOTING
Troubleshooting procedures for the Rear Cover As-
sembly are located in this manual. See the manuals spe-
cific to the Front Cover Assembly, the Control Board or
the Aegis Module for detailed troubleshooting procedures
