Hi Evan, no prob’s we are all human :-)
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Looking at C27 on transmit I noticed that my oscilloscope was reporting 5v whereas my multimeter was showing 50v! All the readings below are with the multimeter including a re-done D1-6 cat.
Q3, Q4 and Q5 all look identical with SA printed on them
X6, I did notice that it’s labelled LPF _0 1 2, which I assume correspond to LPF 1 2 3, that tickled my OCD :-) I’ve used the PCB labelling below.
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|
X6 (multimeter)
|
80
|
40
|
20
|
|
?
|
RX
|
TX
|
RX
|
TX
|
RX
|
TX
|
|
_0
|
3.2v
|
3.2v
|
0
|
0
|
0
|
0
|
|
1
|
0
|
0
|
3.2v
|
3.2v
|
0
|
0
|
|
2
|
0
|
0
|
0
|
0
|
3.2v
|
3.2v
|
|
?
|
?
|
?
|
?
|
?
|
?
|
?
|
|
?
|
?
|
?
|
?
|
?
|
?
|
?
|
|
C27 (multimeter)
|
80
|
40
|
20
|
|
?
|
RX
|
TX
|
RX
|
TX
|
RX
|
TX
|
|
?
|
Vs
|
46v
|
Vs
|
50v
|
Vs
|
50v
|
|
?
|
?
|
?
|
?
|
?
|
?
|
?
|
|
?
|
?
|
?
|
?
|
?
|
?
|
?
|
|
?
|
80
|
40
|
20
|
|
Diode cat (multimeter)
|
RX
|
TX
|
RX
|
TX
|
RX
|
TX
|
|
D1
|
0
|
0
|
5.7v
|
32.7v
|
5.8v
|
34.6v
|
|
D2
|
5.7v
|
32v
|
0
|
2.7v
|
5.8v
|
34.7v
|
|
D3
|
5.7v
|
32v
|
5.7v
|
32.7v
|
0
|
0.3v
|
|
D4
|
0
|
1.3v
|
5.7v
|
32.8v
|
5.8v
|
34.6v
|
|
D5
|
5.7v
|
32v
|
0
|
92.8
|
5.8v
|
34.6v
|
|
D6
|
5.7v
|
32v
|
5.7v
|
32.8v
|
0
|
75.4v
|
?
?
Chris
73 de M0IDE
