Furuno FAX-408 - Manual (Page 35)

3. INSTALLATION
25
External receiver connection
An external receiver may be used in place of the internal receiver. In this case, the receiver should
have a local oscillator with very good frequency stability. Connect the external receiver to the EXT
AF IN terminal at the rear of the set. This terminal operates against an input of greater than
50 mV. Excessive input is protected with a protective circuit. However, if direct current is used,
input should be passed through a non-polarized capacitor of about 1 µF.
3.3.3 Whip or wire antenna
If the preamp unit is not used, a matching box is required. Connect a feeder line between the
antenna and matching box. Attach a connector to the coaxial cable and connect it between the
receiver and the antenna. Use coaxial cable RG-10/UY or
RG-12/UY.
How to attach M-connector
1. Remove sheath by 30 mm.
2. Make the length of the conductor 23 mm. Expose braided shield by 5 mm.
3. Insert coupling ring onto cable.
4. Insert plug assembly onto cable.
5. Solder braided shield and plug assy. through hole in plug assy.
6. Tighten coupling ring to plug assy.
EXTERNAL
RECEIVER
1
μ
F capacitor
EXT AF IN
FACSIMILE
RECEIVER
(+)
(-)
Sheath
Conductor
Insulator
Braided
shield
Plug assy.
Contact sleeve
Cut conductor here.
Solder both
sides of hole.
Coupling ring
Solder here.
30 mm
5 mm 2 mm