RADIOBEACON TRANSMITTER
ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE
Page 4-5
15 September 2003
Table 4-2 Front Panel Controls and Indicators (Continued)
PANEL MARKING/
REF
FIG
NOMENCLATURE
FUNCTION
DES
NO.
USED IN TEXT
F2
MD-1
AC POWER
Fuses line of AC power source at 4.0 (230 VAC)
amperes or 7.0 (115 VAC).
F3
MD-1
REG DC PWR
Fuses DC power source (B+ VDC) to reg15
and +24V power supplies at 2.0 amperes.
F4
MD-1
+
15VDC EXT
Fuses reg15V output, available for external
use, at 0.75 amperes.
J1
MD-1
RF MON
Provides a connection (BNC) for test equipment to
monitor a voltage sample of the RF output.
LS1
MD-1
SPEAKER
Provides an audible signal for local monitoring of the
demodulated keyed tone (identification code).
M1
MD-1
TEST
Provides meter indication of parameter selected by
TEST
switch S6 (
FWD PWR, REFL PWR, MOD %, MOD
% REF, DC CURRENT, B+ VOLTS, +24 VOLTS
and
+15
VOLTS
).
R1
MD-1
VOLUME
Adjusts loudness of speaker output.
R2
MD-1
SET MOD % REF
Adjusted for 100% modulation indication on
TEST
meter M1 when
TEST
switch S6 is set to
MOD % REF
and transmitter is operating in MCW mode.
S1
MD-1
KEYING
Selects programmed keying of modulation (KEYED
MCW) when set to
ON
. Selects continuous
modulation (MCW) when set to
OFF
. Has no
influence if
MOD
switch S2 is set to
OFF
.
S2
MD-1
MOD
Selects carrier only (CW) by turning off modulation
when set to
OFF
. Selects modulated carrier (MCW)
by turning modulation on when set to
ON
.
S3
MD-1
POWER
Master on/off switch for transmitter. Applies AC/DC
power when set to
ON
. Disconnects AC/DC power
when set to
OFF
.
S4
MD-1
CONTROL
Extends 'on/off' switching facility to a remote location
when set to
REMOTE
, provided
POWER
switch S3 is
set to
ON
.
