- 15 -
ITEM U.U.T.
SETTING
ADJUST
POINT
MEASUREMENT
BIAS Current
Set radio to CH 19 USB TX mode.
Modulation Off.
Connect current meter to TP7(+) and TP9 (-)
Connect current meter to TP7 (+) and TP8 (-)
VR12
VR10
50 mA
100 mA
SSB APC
Set radio to CH 19 USB RX mode.
Connect Multimeter to TP7.
VR17 12.5
VDC
SSB TX Power Connect “short PCB” to TP7, TP8 and TP9.
Connect RF Power Meter to antenna jack.
Set radio to CH 19 USB TX mode.
AF signal 30mV, 1 KHz to microphone.
Set RF PWR Fully Clockwise.
Set MIC GAIN Fully Clockwise.
L40,L42,
L43,L44
MAX > 12W
Spurious Emission
Minimum.
Balance Power
Between CH1 and
CH40.
SSB ALC
Set radio to CH 19 USB TX mode.
AF signal 30mV, 1 KHz to microphone.
VR13
11.5 W
SSB Carrier
Balance
Set radio to CH 19 USB TX mode.
Set MIC GAIN Fully Counter Clockwise.
Connect Oscilloscope to antenna connector.
VR6
Spurious Emission to
Minimum.
AM TX
High Power
Set radio to CH 19 AM TX mode.
Modulation Off.
VR14
3.8 W
AM TX
Low Power
Set RF POWER fully counterclockwise.
VR18 0.5W
RF Power
Meter
Set radio to CH 19 AM TX mode.
Set RF POWER fully Clockwise.
Set SWR/MOD/PWR Switch to PWR
position.
VR9
For a needle reading
of “4” on TX PWR
scale.
AM Modulation
Meter
Set radio to CH 19 AM TX mode.
AF signal 30mV, 1 KHz to microphone.
Set MIC Gain fully Clockwise.
Set SWR/MOD/PWR Switch to MOD position
VR16
For a needle reading
of 95% on the
Modulation scale.
Frequency
Counter Adjust
Set radio to CH 19 AM RX mode.
Set CLARIFIER Control to 12 o’clock.
VC1 on
frequency
counter
Display should be
27.1850
4.1.3 RECEIVER ALIGNMENT
Summary of Contents for DX 2547
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Page 13: ...13...
Page 17: ...17 Figure 4 1 Transmitter test setup Figure 4 2 Receiver test setup...
Page 20: ...20...
Page 23: ...23 PART LIST...
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Page 39: ...39 DX 2547 MAIN PCB...
