I'm still trying to debug my problem with the Top Ten band decoders and my
K3 (s). When I put a volt meter on the band data output pins of the K3's
ACC connector, I don't see any positive voltage (all the pins read zero).
When I connect the ACC pins to the Top Ten decoder via an appropriate cable
(thus bringing the decoders pull-up resistors into the picture), I see a
non-zero voltage on the "high" pins, but only between 1.6 and 2.2 volts -
not 5 volts. Without the connection to the K3 in place, the same pins
measure 5 volt (due to the pull-ups).
Is this normal - in particular, is it normal not to be able to measure a
positive voltage on the "high" pins of the ACC connector with nothing other
than the meter attached? I realize that these are "open collector", but I
would have expected to read some positive voltage.
***dan, K6IF
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