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3-2
• BPF TABLE
• While operating on the 144 MHz and 430 MHz bands
The RX signal from the antenna connector ([ANT2]) is passed
through the power/SWR detect circuit (D651 and D661) and
LPF (L591 to L593, C591 and C592).
144 MHz BAND SIGNAL
The RX signal is passed through the LPF (L541 to L543,
C542 to C547) and TX/RX SW (RL531).
When the attenuator is turned ON, the RX signal is also
passed through the 20 dB attenuator (D551 and D552).
The RX signal is then passed through the BPF (MAIN UNIT
: D553 to D556, L552, L553 and C553) and applied to the
pre-AMP (Q551).
The amplifi ed signal is passed through another BPF (MAIN
UNIT: D557 to D560, L557 and C561), RX mute (D181 and
D182), BPF (MAIN UNIT: D3272, L3271, L3272, C3271 to
C3273) and LPF (L3261 to L3263, C3261 to C3267), and
then applied to the 1st RX IF circuit.
430 MHz BAND SIGNAL
The RX signal is passed through the HPF (L441, L442, C441
to C443), mute SW (D433 and D434) and TX/RX SW (D422
to D424).
When the attenuator is turned ON, the RX signal is also
passed through the 18 dB attenuator (D451 and D452).
The RX signal is then passed through the BPF (MAIN UNIT
: D454, L452 and C454) and applied to the pre-AMP (Q451).
The amplifi ed signal is passed through the 2-staged BPF
(MAIN UNIT: D455, L453, C468 and D456, L454, C473), and
applied to the RF AMP (Q481).
The amplifi ed signal is passed through the RX mute (D181
and D182), BPF (D3272, L3271, L3272, C3271 to C3273)
and LPF (L3261 to L3263, C3261 to C3267), and then ap-
plied to the 1st RX IF circuit.
Filter
Operating frequency
(MHz)
Filter switches
Components
Control line
(Active High)
B0
0.030000 to 1.599999
D3111 D3112
L3112, C3112, C3113, C3115
B0
B1
1.600000 to 1.999999
D3121 D3122
L3103 to L3106, C3102 to C3106
B1
B1 and B2
2.000000 to 3.399999
D3121 D3122 and D3131 D3132
L3103 to L3106, C3102 to C3106
and
L3132, L3133, C3132 to C3137
B2
B1 and B3
3.400000 to 6.899999
D3121 D3122 and D3141 D3142
L3103 to L3106, C3102 to C3106
and
L3142, L3143, C3142 to C3146
B3
B1 and B4
6.900000 to 13.899999
D3121 D3122 and D3151 D3152
L3103 to L3106, C3102 to C3106
and
L3152, L3153, C3152 to C3156
B4
B1 and B5
13.900000 to 20.899999
D3121 D3122 and D3161 D3162
L3103 to L3106, C3102 to C3106
and
L3162, L3163, C3162 to C3166
B5
B1 and B6
20.900000 to 39.999999
D3121 D3122 and D3171 D3172
L3103 to L3106, C3102 to C3106
and
L3172, L3173, C3172 to C3176
B6
B1 and B7
40.000000 to 59.999999
D3121 D3122 and D3181 D3182
L3103 to L3106, C3102 to C3106
and
L3182, L3183, C3182 to C3187
B7
B1 and B8
60.000000 to 74.799999
D3121 D3122 and D3191 D3192
L3103 to L3106, C3102 to C3106
and
L3192, L3193, C3192 to C3196
B8