Kevin K. Custer W3KKC wrote:
A while back someone told me that the information on the cos that
is suggested for use is not really the best one to use. I believe
the gent said the rus or rui line is a better place because it
follows the Channel Guard and also has some hysteresis built in
when mobiles are in flutter.
What's the consensus?
What is the pin number for RUS or RUI, or what ever the hell it's
called?
CAS is the 'first' one in line. Carrier Activity Sense. It follows the
receiver regardless of CTCSS/CDCSS. J932 pin 18 is one reference I have
in my notes. I think that is for the base version. I think the mobile is
J904 pin 9.
RUS is the 'second' one in line. Receiver UnSquelched. It only goes high
when the correct CTCSS/CDCSS is present (in addition to the CAS) This
point should be within a few pins of J904 pin 9 (CAS)
I don't have the pin numbers in front of me, but I believe J904 is the
connector they are on. In any case, it is the connector in front of the
audio transformer beside the metering jack. The label right beside the
connector (either mobile or base version) indicates RUS, CAS, and all
other pinouts. It's been a while since I did any interfacing, but if I
recall correctly, CAS will load down *very* easily - even using newer
controllers. It can't source much current. If you don't get them from
someone else, I'll get them at work tomorrow. I've got 4 Micor manuals
here but no Mastr-IIs.
73,
Joe, KR3P
