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6.5.1 Descriptions
The tuner consists the PA control, the matching unit and CS unit. The PA control controls the
tuning and store the tuning data for each channel. The matching unit consists the forward/return
wave sensor, antenna current sensor, Ci, L, Co, Cp, Cs and relays. The CS unit ground the
antenna when the RBK signal is not activated (High).
In case of the NFC-296 there is no CS unit. The Cs capacitance in the matching unit is always
passed when the RBK signal is not activated to ground the antenna through the T2 in the
matching unit.
When tuning the tuner check the VSWR by the preset tuner setting. If the VSWR is over than
about 1.7, the tuner starts the tuning otherwise keeps the preset setting.
6.5.2 Signals from/to the other units.
From/
Connecter
Pin
To
Name
No.
TB1
PA
NAH-
692
695
TB10
698
(NFC-896)
J2
(NFC-296)
TB 3
TB 4
94
NQD-
Console
4190
terminal
1
1
55, 56
2
2
57, 58
3
3
59
4
4
60
5
5
61
6
6
62
7
6
1
7
6
M-J-J RF OUT
Signal
name
+12V
DC power source for the tuner.
GND
DC power return.
TXD
Serial data transmission.
RXD
Serial data reception.
Prohibit
-PA MUTE
Transceiver.
ANT CURR
Antenna current analog data.
The antenna grounded at the CS UNIT
RBK
when not activated (High).
The antenna grounded through the
RBK
tuner when not activated (High).
Coaxial cable center conductor
RF OUT
Coaxial cable shield
Description
the
transmission
of
the
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