5.3 Outline of Boards
5-5
Table 5.3.1 Outline of each board
Unit Board
Main
function
CPU
(05P0773)
Consists of CPU, DSP, CODEC, and DDS. 2nd IF: 37.5 kHz
from CH70 RX, TX/RX, DUP RX board is demodulated by
digitization. Audio signals are digitized just the same, is
modulated on this board, and is outputted to TX/RX board
with 45 MHz.
TX/RX
(05P0774A/B)
Consists of TX/RX circuit. 05P0774A, SIMP-equipped
FM-8800S, and 05P0774B are installed in DUP-equipped
FM-8800D. The difference is whether there is a connector for
DUPLEXER.
- RX circuit: receives RX signal of 150 MHz, converts it into
2nd IF: 37.5 kHz and outputs it into CPU board.
- TX circuit: converts modulated signal of 45 MHz from CPU
board to TX frequency and outputs 25 W.
CH70 RX
(05P0775)
Has the same function as CH70 WR. This converts DSC RX
signal of 156.525 MHz into 2nd IF:37.5 kHz and outputs it
into CPU board.
DUP RX
(05P0777)
Is installed in FM-8800D. This board receives the signal when
DUP CH is selected, converts RX signal of 160 MHz into 2nd
IF: 37.5 kHz, and outputs it into CPU board.
DUPLEXER
Is installed in FM-8800D. DUPLEXER prevents TX signal to
entering RX circuit and makes DUPLEX communication
possible by carrying out TX with LPF of 157.5 MHz and RX
with HPF of 160.6 MHz.
POWER
(05P0776)
O15 VDC from input power of +24 VDC and is
equipped with over voltage protection, low voltage protection,
and over-current protection.
PANEL
(05P0772)
Consists of LCD, KEY SW, and their lighting. LCD dot
numbers are 160 x 160. ** 26 characters x 20 lines.
FM-8800S
FM-8800D
RTC
(05P0804)
Added to the Russian Ver.
On the RTC board, use for Time stamp (Date and Time) in the
[LOG] menu.
JUNCTION BOX:
IF-8810
JUNCTION
(05P0790)
Functions as a junction between the Transceiver unit and
Remote station, GPS, VDR and Wing-MIC.
DMC INTERFACE:
IF-8820
DMC IF
(05P0778)
Non-use for the Russian Ver.
Makes a communication with the Transceiver unit CPU and
interfaces DMC-5 and a Remote stations.
HANDSET:
HS-2003
HANDSET
(05P0780)
Is to be connected to the Transceiver unit and uses Condenser
MIC.
HS CONT
(05P0781)
Sends a result of key operation to the Transceiver unit CPU
and the Transceiver unit responds to its result.
KEY
(05P0715)
Consists of lighting circuit of key and LED.
HANDSET:
HS-8800
LCD Module
(MFM-073Q10)
A total dot numbers are 91x72. Indication will be within 13
digits x 7 lines.
REMOTE
(05P0779)
Consists of DISTRESS ALERT BUTTON and AF AMP.
REMOTE
STATION: RB-8800
TB (05P0782)
Functions as a junction between a Remote stations
REMOTE
STATION: RB-8810
TB (05P0798)
Functions as a junction between a Remote stations
Summary of Contents for FM-8800
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