RF FM-2ST User manual

OPERATING INSTRUCTIONS
FM-2ST FM MODULATOR
FM-2 is a frequency agile FM stereo modulator for FM broadcast band.
SELECT
MHz
LOCK
8 8
RF OUT
DOWN
DC IN
FM-2
FM Modulator
AUDIO IN
L/MONO
AUDIO IN
RIGHT
25570 TEIJO FINLAND
RF TUOTE OY
15V 450 mA
74 mm
103 mm
INSTALLATION
FM-2 must be installed in a dry and locked room.
The modulator can be installed on the wall by using fixing
holes.
The dimension are shown in figure 1.
Sufficient air current must pass around the unit.
Figure 1.
Audio signal is connected to AUDIO IN L/MONO and AUDIO IN RIGHT connectors (RCA-female).
RF OUT is connected to network via tap or combiner.
The modulator is supplied with the power supply, which is connected to DC IN connector. LOCK led is showing
the power is connected.
PROGRAMMING
FM-2 is programmed with the push buttons UP, DOWN and SELECT. In the Table 1. are the functions, which
can be programmed.

PARAMETER DISPLAY EXPLAIN
Output frequency 88...108 FM-2 output frequency with 100 kHz steps
Deviation AL -6…+6Volume
Audio mode STER Stereo
mono Mono
Output level L 0...-20 Attenuator 0...20 dB
Table 1.
Press UP, DOWN and SELECT push buttons down. At first release UP and DOWN push buttons. Then
release SELECT push-button. Reading on the display is the output frequency.
The frequency can be changed by push buttons UP and DOWN. The output frequency is digits on the display.
After selecting the output frequency wait about 4 seconds until the LOCK led lights up and the frequency is
stored.
Press SELECT push button (within 15 seconds after LOCK led has lighted up) to adjust output level.
Select the required value by UP and DOWN push buttons. The selected value is stored when LOCK led is
lighted up.
SPECIFICATION
RF
Modulation FM max. + 75 kHz
Stereo CCIR Pilot tone
Output frequency 88...108 MHz
Tuning steps 100 kHz
Output level 128 dBµV (about 100mW), adjustable -20dB/75ohm
Spurious products < 60dbc
Output impedance 75 ohm
Audio
Nominal input level 0,5 Vrms @75kHz dev.
Frequency response 40 Hz…15 kHz + 0,5 dB
Distortion < 0,5%
Pre-emphasis 50us
Signal to Noise ratio > 40 dB
Input impedance 10 kohm
General
Power max. 15V/450mA
Operating temperature -10...+50 oC
Dimensions 110 mm H*130 mm W*40 mm D