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DX 949
CHAPTER 1
SPECIFICATIONS
1.0 GENERAL
Model DX
949
Frequency Range
26.965 - 27.405MHz.
Emission Modes
AM/USB/LSB
Frequency Control
Phase Lock Loop (PLL) synthesizer.
Frequency Tolerance
±
0.005 %.
Frequency Stability
±
0.001 %.
Operating Temperature Range
-30
°
C to +50
°
C.
Microphone
Plug-in dynamic; with push-to-talk switch and coiled
cord.
Input Voltage
13.8V DC nominal
±
15%.
Current Drain : Transmit (AM full mod.)
<3.5A.
Current Drain : Receiver (Squelched)
<0.5A.
(Max. audio output)
<1.0A.
Antenna Connector
UHF, SO239.
Dimensions
2-3/8”(H) x 7-7/8”(W) x 9-1/4”(D).
Weight 5
lb.
1.1 TRANSMITTER
RF Power Output
AM : 4W SSB : 12W
RF Transmit Modes
AM/SSB
Modulation
High and low level Class B, Amplitude Modulation :
AM and SSB
Spurious Emissions
-55 dB.
Carrier Suppression
-55 dB.
Audio Frequency Response
300 to 2500Hz
Antenna Impedance
50 Ohms.
Output Indicators
Meter shows relative RF output power, SWR and AM
Modulation. Transmit LED glows red when
transmitter is in operation.
1.2 RECEIVER
Sensitivity For 10dB S/N (AM)
<0.5
µ
V
Sensitivity For 10dB S/N (SSB)
<0.25
µ
V.
IF Frequency
AM : 10.695 MHz 1st IF, 455 KHz 2nd IF.
Image Rejection
-65 dB.
Adjacent Channel Selectivity
-60 dB.
RF Gain Control
45 dB adjustable for optimum signal reception.
Automatic Gain Control (AGC) Figure Of Merit
100 mV for 10 dB Change in Audio Output
Squelch
Adjustable; threshold less than 0.5
µ
V.
Noise Blanker
RF type.
Audio Output Power
2 watts into 8 Ohms.
Audio Frequency Response
AM and SSB : 300 to 2500 Hz.
Built-in Speaker
8 Ohms, round.
External Speaker (Not Supplied)
8 Ohms; disables internal speaker when connected.
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
Summary of Contents for DX 949
Page 1: ......
Page 13: ...12 DX 949 CIRCUIT DIAGRAM...
Page 14: ...13 CHAPTER 4...
Page 18: ...17 Figure 4 2 Receiver test setup...
Page 19: ...18 Figure 4 3 Main PCB Adjustment Locations CHAPTER 5...
Page 23: ...22...
Page 29: ...28 DX 949 MAIN PCB REMARK SOLDER SIDE WHITE...
Page 33: ...32...
Page 34: ...33 AT0949040A...
Page 35: ...34...
