RADIOBEACON TRANSMITTER
ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE
Page 4-12
15 September 2003
Table 4-7 RF Synthesizer PWB (A9) Controls
PANEL MARKING/
REF
FIG
NOMENCLATURE
FUNCTION
DES
NO.
USED IN TEXT
E1/E2/E4
MD-3
♦
RF Drive Internal/External
Shunt posts that select the source of the RF drive
signal. Refer to the RF synthesizer PWB’s service
instruction manual for further detail.
E3
MD-3
♦
PDM Selection
Not used in NDB transmitters.
E5
MD-3
♦
Balanced Drive Matching
7-position shunt post that allows matching of the
balanced drive signal.
Set to E5:A for NDB
transmitters.
R32
MD-3
♦
SYMMETRY
Not used in NDB transmitters.
R41
MD-3
♦
IPM BAL
Not used in NDB transmitters.
S1
MD-3
♦
X 1000
Rotary 10-position BCD switch that selects the carrier
frequency’s thousands digit (either ‘0’ or ‘1’), in kHz.
S2
MD-3
♦
X 100
Rotary 10-position BCD switch that selects the carrier
frequency’s hundreds digit, in kHz.
S3
MD-3
♦
X 10
Rotary 10-position BCD switch that selects the carrier
frequency’s tens digit, in kHz.
S4
MD-3
♦
X 1
Rotary 10-position BCD switch that selects the carrier
frequency’s units digit, in kHz.
S5
MD-3
♦
X 0.1
Rotary 10-position BCD switch that selects the carrier
frequency’s tenths digit, in kHz.
S6:1/2/3
MD-3
♦
IPM Correction Capacitance
Not used in NDB transmitters.
S6:4
MD-3
♦
IPM Correction
Enable/Disable
Set to closed (disabled) for NDB transmitters.
♦
- Refer to the RF synthesizer PWB’s service instruction manual to locate referenced item.
