Sailor RM2042 Technical Manual page 74

5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS
CH70 CARRIER VHF CARRIER
DETECT DETECT
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
5V SUPPLY
The 5V supply is generated from the battery voltage by the series voltage regulator U11.
This regulator is of the type 78L05AC, which is able to deliver a current of about 50mA without any heat
sink.
10V SUPPLY
The 10V supply is generated from the battery voltage by the series voltage regulator U10, which is of the
type LP2951C. The output voltage is determined by four feed back resistors (R121 to R124) and is
adjustable by means of the trimming resistor R124.
The LP2951C has a build-in facillity for generating an error signal, when the output voltage drops more
than 5% with respect to the programmed output voltage. This error signal is watch every one milli second
by the microprocessor to ensure a controlled power down sequence.
PAGE 5-18
AF SIGNAL MODULATION
DETECT DETECT
0 0
1 0
0 1
1 0
0 1
1 0
0 1
1 0
REMARKS
No carrier detected at CH70 receiver,
and no carrier detected at ext. VHF.
Af signal detected because of noise.
Non existing combination.
No carrier detected at CH70 receiver,
byt carrier detected at ext. VHF.
AF signal detected from ext. VHF.
No carrier detected at CH70 receiver,
but carrier detected at ext. VHF.
No AF signal detected from ext. VHF.
Carrier detected at CH70 receiver,
and no carrier detected at ext. VHF.
AF signal detected from CH70 receiver.
Carrier detected at CH70 receiver,
and no carrier detected at ext. VHF.
No AF signal detected from CH70 receiver.
Carrier detected at CH70 receiver,
and carrier detected at ext. VHF.
AF signal detected from CH70 receiver.
Carrier detected at CH70 receiver,
and no carrier detected at ext. VHF.
No AF signal detected from CH70 receiver.
RM2042
9341