QCX assembly Rev 1.08
125
Location
Voltage Comment
+ supply terminal
11.98
As I already mentioned: a 12V supply
Clk0 test pin
~1.70
The Clk0 pin in normal operation has a 3.3V peak-peak
squarewave with 50% duty cycle. The DVM is measuring
the average of that. Measuring here makes a lot of nasty
noise in the audio.
Clk1 test pin
~1.70
The Clk1 pin in normal operation has a 3.3V peak-peak
squarewave with 50% duty cycle. The DVM is measuring
the average of that. Measuring here makes a lot of nasty
noise in the audio.
Left side of C2
3.40
This is the voltage of the Si5351A supply, pins 1 & 7
Right side of D2
4.96
This is the +5V regulated supply
T1 pins 1, 2, 3 & 4
0.00
T1 pins 5, 6, 7 & 8
2.36
Top side of C43
2.28
C43-46 are the QSD integrating capacitors. The voltage
across each one differs slightly. The following
measurements show these small differences.
Top side of C44
2.44
Top side of C45
2.42
Top side of C46
2.30
IC5 pin 1
2.64
IC5a output, the pre-amp I output
IC5 pin 2
2.46
IC5 pin 3
2.26
IC5 pin 4
0.00
IC5 pin 5
2.28
IC5 pin 6
2.46
IC5 pin 7
2.44
IC5b output, the pre-amp Q output
IC5 pin 8
11.67
This is the supply voltage minus the voltage drop caused by
the reverse polarity protection diode D3
IC6 pin 1
2.44
IC6a output
IC6 pin 2
2.44
IC6 pin 3
1.63
IC6 pin 4
0.00
IC6 pin 5
1.55
IC6 pin 6
2.44
IC6 pin 7
2.44
IC6b output
IC6 pin 8
11.67
IC7 pin 1
2.64
IC7a output
IC7 pin 2
2.64
IC7 pin 3
1.99
IC7 pin 4
0.00
IC7 pin 5
1.89
IC7 pin 6
2.64
IC7 pin 7
2.64
IC7b output
IC7 pin 8
11.67
IC8 pin 1
2.46
IC8a output
IC8 pin 2
2.46
IC8 pin 3
0.65
IC8 pin 4
0.00
IC8 pin 5
0.67
IC8 pin 6
2.48
IC8 pin 7
2.48
IC8b output
Summary of Contents for QCX 5W CW
Page 9: ...QCX assembly Rev 1 08 9...
Page 10: ...QCX assembly Rev 1 08 10...
Page 12: ...QCX assembly Rev 1 08 12...
Page 50: ...QCX assembly Rev 1 08 50...
Page 105: ...QCX assembly Rev 1 08 105...
