[App_rpt-users] Odd CTCSS behavior on RTCM

[Mark Johnston]

I have noticed my CT decode is not working on the RTCM's either, no one
seems to know why... even the mfg.

Mine takes it from carrier mode or something, even though I know the ctcss
line is working
for whatever reason the rtcm will not honor the signal - i.e. anyone
without a PL can bring up the system, yet noise and such does not cause any
issues, I had an interference issue with my repeater, as it is at home now,
test site before I get it up on the mountain and I would get feedback,
causing it to loop, now with the RTCM this doesnt happen, it's almost like
a smart squelch anyway even signals a bit off freq don't seem to trip it
up.. anyhow Maybe PL is not really usable with the RTCM??? No one seems to
be able to answer why that is either.


Maybe in your case the RTCM is sinking too much current?
what settings do you have for the RTCM? btw...


12 - External CTCSS (0=Ignore, 1=Non-Inverted, 2=Inverted) (1)
13 - COR Type (0=Normal, 1=IGNORE COR, 2=No Receiver) (1)
14 - Debug Level (0)
17  - DSP/BEW Mode NOT SUPPORTED
18 - "Duplex Mode 3" (0=DISABLED, 1-255 Hang Time) (1/10 secs) (0)
19 - Simulcast Launch Delay (0) (approx 200 ns, 5 = 1us, > 0 to ENA SC)
20 - Ext. CTCSS Input Threshold (0) (0-1023)

One thing I noticed was the #20 but I can't seem to set it to anything...
unclear what that is for then.

also im on S/W Version: 1.46 03/04/2014
Seems to be more stable but not sure if it would help you at all -


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On Mon, Jun 9, 2014 at 6:46 PM, Chris Bunting <chris at lancnet.com> wrote:

> Running version 1.41 .
> Have 2 rtcms connected to mtr2000 , thunderbolt gps , pretty standard
> setup.
> My simulcast is working great, however I can't get ct decode to work
> properly. It's either in carrier mode or it doesn't work .
>
> Odd things happen when I put what I assume is the correct settings in the
> ct and for config on the rtcm. The rx light flashes and sometimes let's a
> signal thru , but my repeater sorta goes flaky like the rtcm is pulling the
> line down and flaking it out. The voltage pulsates on the CTCSS line and
> the repeater receiver light goes out when it is actually receiving a
> signal. Very odd .
>
> Is 1.41 the best version? Any ideas what I'm doing wrong??
> I'm using the rdstat2 pin on the MTR for CTCSS decode and it reads 5 volts
> when receiving a valid pl .
>
> Thanks in advance
> N3FYI
>
>
>
> --
> Sent from My iPad
>
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