Rf Power Detector, Tx-Rx Switch - Tokyo Hy-Power HL-1.5KFX User Manual

11-3 RF Power Detector/ TX-RX Switch (PC1667)
As illustrated below, there are two RF power detectors on this board. One detects the drive signal level
from the radio and the other monitors the outgoing power and the reflected power from the load
(antenna). These detected signals are sent to the MPU -PCS1699 Main Control board, which monitors
the operating condition of the entire amplifier.
The TX-RX switch (Send-Receive switching) will switch the flow of drive power/ output power and the
incoming signal from the antenna with two high-speed relays mounted at the input and output sides of
the PA. A two-channel antenna switch (A/B) is also installed on this main board.
The limiter on this board, together with the pre-scaler on PC1675, help the MPU on the Main Control to
count the frequency of the RF drive signal.
PC 1667
INPU T
1S 2076A
PC 1675
PRES CA LER
78L05
TD 7101F
+12V
AM P D RIVE
ON AIR
DE TE CT OR
INPU T D ET
LI MITER
PO WE R AM P
SD 2933/T HP 2933
AM P O UT
O NAI R
OU TP UT D ET
1S2076A 1S2076A
21
AN T SEL
AN T A
AN T B
M ai n Co nt ro l
FO RW AR D
RE FLEC T
MP U
R F INPU T
FR EQ