User Manual

PROGRAMMING
3-5
Part No. 001-3422-003
C-WORD
The C-Word programs the Auxiliary (2
nd
LO injection frequency) and selects auxiliary preselector mode.
PA = 1
NA = 584 (for 7.5 kHz resolution)
NA = 438 (for 6.25 kHz resolution
NA = 876 (for 5.0 kHz resolution)
NA = 1095 (for 2.5 kHz resolution) NOTE: applies to Band 6 only.
Where: NA = LO2 ÷ FCM
B-WORD
The B-Word programs the Fractional-N charge pump current factor (CN), the binary acceleration factors (CL/
CK) and the prescaler modulus. The value of CN should be interpolated for frequencies between the band edges.
The recommended range of CN provides the necessary spurious rejection required to meet the adjacent channel
specifications across the band.
Table 3-3 CN VALUES VERSUS FREQUENCY AND BAND
Band 4 (132-150 MHz) Band 5 (150-174 MHz) Band 6 (150-174 MHz)
Frequency Transmit Receive Frequency Transmit Receive Frequency Transmit Receive
MHz CN CN MHz CN CN MHz CN CN
132 78 91 150 150 82 95
150 88 101 174 174 93 106
CK = 0000
CL = 00
PR = 10 (selects modulus 3 prescaler)