C148GTL DX ALIGNMENT PROCEDURE
1. Test Equipment Required
a) VTVM (Fuli scalę; IV DC with RF Probe)
b) RF Output Power Meter.
c) Spectrum Analyzer.
d) Frequency Counter (0-30MHz).
e) DC Pcwer Supply (13.8V, 2Amp>.) .
f) 50 ohm load and Attenuator.
g) Oscilloscope (0-30MHz).
h) AF Oscillator.
i) DC Ammeter.
2. Alignment Procedure
Alignment of Transmitter Section
STEP
PRESET ТО ADJUSTMENT PROCEDURE
1
TX. Mode.
Band SW: Mid
CH : 19
Mode : USB
Mic. VR: CW
CH9 : OFF
Coarse : Center
VRll
Rénové PC-834 (PCB) and connect DC Am
meter to TP9(+) and TP8(-). Adjust for
50mA reading.
2
Same as Step 1.
VR10
Connect DC Ammeter to TP9(+) and TP7(-)
and adjust for 50mA reading.
3 Same as Step 1,
except Mic input
30mV.
VR12
L53
Restore PC-834. T u m VR12 to Mac. CW.
and t u m the core of L53 to the obttcm.
4 Same as Step 3. L52, 54, 55
Adjust for Max. reading on RF VTVM.
5 Same as Step 3.
L53
Set the Band: HI, CH40. And adjust for
Max. reading on RF VTVM, then t u m the
Band: LOW, CH 1, readjust for mimimum
différence in output power.
6
Same as Step 1,
except;
Mode : AM
Mic input 90% irod
L44
Adjust for Max. reading on RF VTVM.
40
To Next Page
Loading...
