User's Manual

17
Antenna Noise cont.
Elimination
1. Test or have tested the antenna lead for any breaks or shorts.Signs of crimping, .
. kinking, fraying or rust usually indicates damage to the cable.Replace the
antenna or cable if necessary.
Ignition Noise
A popping or crackling noise heard through the speakers. The noise will vary as the
engine rpm varies,The noise will Only be present with the engine running
Elimination
1. Install an L.C. Filter Network in the power lead of the radio. The filter should
be rated at minimum 3 amps.
2. Inspect spark plug and distributor cable for signs of wear or damage. Replace as
. necessary using resistor cable only. Metal conductor ignition cables increase
. static interference.
NOTE: Do not use spark plug or distributor noise filters as these can create more
problems than they can s
olve. They decrease the quality of the spark generated by
the spark plugs and they may create more static than they eliminate.
Accessory Noise
A popping heard when the lights, turn indicators, windshield wipers, cigarette lighter,
etc. are switched on indicate a vehicle wiring deficiency. Most occurrences are
minor and preset no risk to the stereo system other than the annoyance to the lis-
tener. However, severe cases may damage the speakers, minor occurrences can be
remedied. A professional must attend to severe occurrences, as they presen
t a
threat to not only the stereo system but to the vehicle wiring itself.
Elimination
1. Install an L.C. Filter Network in the power leads of the USA 740 radio. The filter
should be rated at a minimum of 3 amps.
2. If the noise persists, consult a professional automotive service technician.
Radio Specifications
FM Section
Tuner Type . . . . . . . . . . . . . . . . . . . . . . . . .PLL
Frequency Range . . . . . . . . . .87.5-107.9 MHz
Usable Sensitivity . . . . . . . . . . . . . . . . .12.5dBf
Quieting Sensitivity . . . . . . . . . . . . . . . . . .4uV
T.H.D . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8%
AM Section
Frequency Range . . . . . . . . . . . .530-1710KHz
S/N Ratio . . . . . . . . . . . . . . . . . . . . . . . . .50dB
Selectivity . . . . . . . . . . . . . . . . . . . . . . . . . 25dB
Audio Section
Output Channel . . . . . . . . . . . . . . . . . . 45 X 4
Output Impedance . . . . . . . .4ohm per speaker
Response . . . . . . . . . . . . . . . . . . .30Hz-I8KHz
General
Power Supply . . . . . .12VDC Negative Ground
Speaker impedance . . . . . . . . . . . . . .2-8 ohm
Stand-By Current . . . . . . . . . . . . . . . . . .<2mA
Chassis ...
.
3
/4"
IF Frequency.......................10.7MHz
Sensitivity ...............................2.6V
S/N Ratio ...............................67dB
Capture Ratio........................1.5dB
Separation..............................35dB
IF Frequency......................
450KHz
Sensitivity............................. 2OuV
System Power.........Max 300 Watts
THD ..........................................1%
Note: All specifications are subject
to change without notice.
200mm(7- )(w) X 50mm (2")H
X 150mm (5-
7
/8")(D)
To charge mobile phones through
to USB interface max 1000mA.....