Without a manual in front of me I assume you are speaking of
RXMUTE which is the control lead which the CG board affects. RX Mute
"Floats" high in absence of pull down from many sources. If you are
connecting that point to something in your controller which has resistance
to ground greater than about 47k, it may not allow rxmute to swing.The
pullup is very low current and comes from the IFAS board module itself.
The theory of how this subsystem works is .. Any external force (
including CG, dcg, external controllers etc) with open collector feeds may
pull down the rx mute line and mute the rx and clamp everything shut. When
valid status occurs, all sources release pulldown on rxmute and the audio
opens and everything in the downstream subsystems happens. ( Like repeat,
or line drive or whatever....)
The output of the channel guard board is an open collector pull to
ground ( or lack there of if you prefer ). Valid detect = open from what
was pull to ground ( or not low if I am not explaining it well... it IS NOT
HIGH at that point either, just lack of low....)
I just pulled the LBI to check your jumpers,
Unless you provide your own pullup, H41-42 must be installed... as
that is the normal source of pullup on the rx-mute control line.
Doug Bade
Cleveland Comms.
KB8GVQ
At 09:48 AM 9/7/2004, you wrote:
>I cannot get the CG card to work in a base/rptr MastrII. I've tried 2
>dip switch and 1 versatone CG card and Pin 5 on J908 does not swing
>above ~.24mV on correct tone inject (supposed to go to +4v when
>correct tone is active). I do NOT have H68-69 jumpered or
>H41-42. On the 10v card, I have H1-2 and H1-3 jumpered. Also using
>the remote audio card but that shouldn't be a problem. I think this
>is a jumper problem.
>
>Any help will be appreciated.
>
>John/N4SJW
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