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3.6 BK (Break-in) Connection
BK (Break-in) connection is necessary when the FS-1503 is installed together with an HF
receiver or transceiver. The BK circuit functions to mute the receiver when it and the FS-1503
are operated together. With no BK connection, the receiver may generate unwanted noise or its
front end may be damaged by strong signals when the radio is transmitted.
Necessary parts
The BK function requires the CONTROL Kit, which consists of the CONTROL Board, con-
nector assy., gasket and washer. Install the board following the illustration on page 3-6. For
connections, see the interconnection diagram on page S-1.
Contents of CONTROL Kit OP05-41 (Code no. 005-920-330)
emaNepyT.oNedoCytQ
BCPLORTNOC9540P50000-148-5001
)3(teksaG3-2210-920-50348-780-0011
.yssArotcennoC6480S50913-521-0001
rehsaW5.0x0.22x2.61948-108-0001
3.7 Telex Filter (Bandpass Filter)
The Telex filter is installed on the TX/RX Board. Install it as shown in the figure below.
TX/RX BOARD
05P0666
Solder Telex
filter to FL3.
Note direction
on underside of
filter.
OUT IN
E E
FL3
This filter has been
mounted at factory
on the FS-1503A.
Figure 3-4 TX/RX Board, installation of Telex filter