Galaxy DX-939 Manuel du propriétaire - Page 2
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CHAPTER 1 SPECIFICATIONS
GENERAL
Model
DX-939
Channels
40
Frequency Range
26.965 ~ 27.405 MHz
Emission
AM
Frequency Control
Phase-Lock-loop (PLL) Synthesizer
Frequency Stability
0.001%
Temperature Range
-30°C to +50°C
Input Voltage
13.8 VDC
Antenna Impedance
50 Ohms
Speaker Impedance
8 Ohms
Size
7 7/8" (W) x 9 1/4" (D) x 2 1/8" (H)
Weight
5.5 lbs.
TRANSMITTER
RF Power Output
AM : 4W
Frequency Response
300 to 2500 Hz
Frequency Tolerance
0.005%
Spurious Emission
Better Than -55 dB
Unwanted Sideband
Better Than -55 dB
RECEIVER
Sensitivity for 10 dB (S+N)/N
AM : 0.5 uV
Squelch Sensitivity
Less Than 0.5 uV
Audio Power Output
2W @ 10% Distortion
Image Rejection Ratio
-65 dB
AGC Figure of Merit
100 mV for 10dB Change in Audio Output
Audio Response
300 to 2500 Hz
± 1.0 KHz
Clarifier Range
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
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CHAPTER 2 INSTALLATION
LOCATION
Plan the location of the transceiver and microphone bracket before starting the
installation. Select a location that is convenient for operation and does not interfere
with the driver or passengers. In automobiles, the transceiver is usually mounted
the dash panel with the microphone bracket beside it.
MOUNTING THE RADIO
The transceiver is supplied with a universal mounting bracket. When mounting
the bracket and radio to your car, make sure it is mechanically strong. Also, provide
a good electrical grounding connection to the chassis of the vehicle. Proceed as
follows to mount the transceiver:
1. After you have determined the most convenient location in your vehicle, hold
the transceiver with mounting bracket in the exact location desired. If nothing
will interfere with mounting it in the desired position, remove the mounting
bolts. Before drilling the holes, make sure nothing will interfere with the
installation of the mounting bolts.
2. Connect the antenna cable plug to the standard receptacle on the rear panel.
Most transceiver antennas are terminated with a type PL-259 plug and mate
with the ANT receptacle.
3. Connect the red DC power input wire (with the fuse) to +13.8V DC. This wire
extends from the rear panel. In automobile installation, +13.8V DC is usually
obtained from the accessory contact on the ignition switch. This prevent the set
being left on accidentally when the driver leaves the car and also permits
operating the unit without the engine running. Locate the accessory contact on
most ignition switches by tracing the power wire from the AM broadcast
receiver in the car.
4. Connect the black lead to –13.8V DC. This is usually the chassis of the car.
Any convenient location with good electrical contact (remove paint) may be
used.
5. Mount the microphone bracket on the right side of the transceiver or near the
transceiver, using two screws supplied. When mounting in an automobile,
place the bracket under the dash so that microphone is readily accessible.
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