PRESIDENT JOHNSON II VOX 12/24 V, Owner'S Manual

Page: 33 / 56

33
D) TECHNICAL CHARACTERISTICS
1) GENERAL
- Channels : 40
- Modulation modes : AM/FM
- Frequency ranges : from 26.965 MHz to 27.405 MHz
- Antenna impedance : 50 ohms
- Power supply : 13.2 V / 24 V
- Dimensions (in mm) : 170 (W) x 150 (D) x 52 (H)
- Weight : 1 kg
- Accessories supplied : microphone UP/DOWN with support,
mounting cradle, screws and fused power
cord.
2) TRANSMISSION
- Frequency allowance : +/- 300 Hz
- Carrier power : 4 W AM / 4 W FM
- Transmission interference : inferior to 4 nW (- 54 dBm)
- Audio response : 300 Hz to 3 KHz in AM/FM
- Emitted power in the
adjacent channel : inferior to 20 µW
- Microphone sensitivity : 3.0 mV
- Drain : 2 A (with modulation)
- Modulated signal distortion : 1.8 %
3) RECEPTION
- Maxi. sensitivity at 20 dB
sinad : 0.5 µV - 113 dBm (AM/FM)
- Frequency response : 300 Hz to 3 kHz in AM/FM
- Adjacent channel selectivity : 60 dB
- Maximum audio power : 3 W
- Squelch sensitivity : minimum 0.2 µV - 120 dBm
maximum 1 mV - 47 dBm
- Frequency image rejection
rate : 60 dB
- Intermediate frequency
rejection rate : 70 dB
- Drain : 400 mA nominal / 1000 mA maximum
E) TROUBLE SHOOTING
1) YOUR CB RADIO WILL NOT TRANSMIT OR YOUR
TRANSMISSION IS OF POOR QUALITY
- Check that the antenna is correctly connected and that the SWR is
properly adjusted.
- Check that the microphone is properly plugged in.
- Check that the programmed configuration is the correct one ( see p.
52 ).
2) YOUR CB RADIO WILL NOT RECEIVE OR RECEPTION IS
POOR
- Check that the
Local
function is not activated
- Check that the squelch level is properly adjusted.
- Check that the programmed configuration is the correct one ( see p.
52 ).
- Check that the volume is set to a comfortable listening level.
- Check that the microphone is properly plugged in.
- Check that the antenna is correctly connected and that the SWR is
properly adjusted.
- Check that you are using the same modulation mode as your corre-
spondent.
3) YOUR CB WILL NOT LIGHT UP
- Check the power supply.
- Check the connection wiring.
- Check the fuse.
F) HOW TO TRANSMIT OR RECEIVE A MESSAGE
Now that you have read the manual, make sure that your CB Radio
is ready for use (i.e. check that your antenna is connected).
Choose your channel (19, 27).
Choose your mode (AM/FM) which must be the same as that of your
correspondent.
Press the «push-to-talk» switch and announce your message «Attention
stations, transmission testing» which will allow you to check the clearness
and the power of your signal. Release the switch and wait for a reply.
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