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TS-2000/X
CIRCUIT DESCRIPTION
The 118~174MHz signal distributed to the sub-receiver unit passes through a variable tuning filter and is amplified by the second amplifier (Q24). Then, it passes through the 2-pole variable tuning BPF, and the 220~300 MHz signal is amplified by Q23 and is then input into the mixer (IC5) for the sub-band common to the VHF and UHF bands. The 1pole and 2-pole BPFs for the sub-band VHF also controls the tuning frequency by the output from the D/A of the TX-RX1 unit (X57-605). The incoming signal from the UHF band antenna terminal enters the UHF section of the final unit (X45-360), passes through the HPF and LPF and goes to the TX-RX2 unit (X57605). Then, it passes through the 12dB ATT circuit and goes to the pre-amplifier (Q14). The amplified receive signal is distributed to the paths of the main and sub-receiver sections by the L distribution circuit. The signal distributed to the main receiver section passes through the 3-pole variable tuning BPF and is amplified by the second amplifier (Q21). Then, it passes through the 3-pole variable tuning BPF and is input into the mixer (IC4) for the main band. This 3-pole x 2 stage BPF for the UHF also controls the tuning frequency by the output from the D/A of the TX-RX1 unit (X57-605).
Filter X51-315 VHF ATT �12dB Final X45-360 UHF ATT �12dB L108~111,137 L116~119,133 TX-RX 2 (X57-606 A/11) D10 D22 D24 LO1RX 183.895~ 418.105MHz D9 Q14 D23 Q21 Q30 D48 XF1 IC4 41.895MHz Q42,43
Q22 D46
The 438~450MHz signal distributed to the sub-receiver section passes through the SAW filter (L29), is amplified by the second amplifier (Q25), and passes through another SAW filter (L50). The 300~438MHz and 450~512MHz signals are amplified by Q19 and goes to the mixer (IC5) for the sub-band.
� E, E2 destinations
Then, the signal passes through the 12dB ATT circuit and the 2-pole BPF (band-pass filter) and enters the pre-amplifier (Q15). The amplified receive signal is distributed to the paths of the main and sub receiver sections by the L distribution circuit. The signal distributed to the sub-receiver section passes through a variable tuning filter and is amplified by the second amplifier (Q22). Then, it passes through the 2-pole tuning BPF, and goes to the mixer (IC5) for the sub-band common to the VHF and UHF bands. The 1-pole + 2-pole BPFs for the sub-band VHF also control the tuning frequency by the output from the D/A of the TX-RX1 unit (X57-605). The signal distributed to the sub-receiver section passes through the SAW filter (L29), is amplified in the second amplifier (Q25), passes through another SAW filter (L50) and goes to the mixer (IC5) for the sub-band.
Q15
L23,24 Q24 L47,55
RIF Q61 RIF
Q38 D49 Q44 LO31 31.200MHz
X57-605
Fig. 5 Main band receiver section
Filter X51-315 VHF ATT �12dB D96 Q23 Final X45-360 UHF D97 D90 L29 Q25 L50 D91 D82
D24 D10 Q15 D22 D95 D101 L28 Q22 L44,52 D46
ATT �12dB
D9 Q14 D20 D92 D81 D23
Q19 D93
D94
TX-RX 2 (X57-606 A/11)
IC5
14
Fig. 6 Sub band receiver section
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