[App_rpt-users] Odd CTCSS behavior on RTCM

Chris Bunting chris at lancnet.com
Fri Jun 13 12:41:21 EDT 2014


It is 5 volts high and 0 volts low, Motorola MTR2000, so no issues
there, which is why I'm perplexed
Thanks,
Chris Bunting
Lancaster Networks, LLC | Lancaster Towers, LLC
717-459-4321


On Fri, Jun 13, 2014 at 12:18 AM, Tim Sawyer <tim.sawyer at mac.com> wrote:
> You may in fact need a transistor circuit. The RTCM CTCSS needs to have very
> near rail voltages. If your radio isn’t pulling the CTCSS input to very
> close to zero volts it won’t work. So do check your CTCSS output while
> connected to the RTCM. Make sure it goes to zero and build a circuit if not.
> I like to use VN10K’s for that.
> --
> Tim
> :wq
>
> On Jun 12, 2014, at 7:12 PM, Chris Bunting <chris at lancnet.com> wrote:
>
> tried every setting, and upgraded to 1.46, no dice. I'm going to try
> and build a transistor circuit for it and see if that helps
> It would be nice if there was a readme file that explained what the
> voter-plus.cry file vs voter-smt.cry was, and some updated docs on the
> actual rtcm... they are heavily out of date and aren't very detailed.
>
> also a changelog would be nice?
>
> Thanks,
> Chris Bunting
> Lancaster Networks, LLC | Lancaster Towers, LLC
> 717-459-4321
> Thanks,
> Chris Bunting
> Lancaster Networks, LLC | Lancaster Towers, LLC
> 717-459-4321
>
>
> On Thu, Jun 12, 2014 at 2:59 PM, Tim Sawyer <tim.sawyer at mac.com> wrote:
>
> If your CTCSS signal goes low with a tone you want to set the RTCM CTCSS to
> inverted.
> --
> Tim
> :wq
>
> On Jun 12, 2014, at 11:02 AM, Mark Johnston <markjohnston73 at gmail.com>
> wrote:
>
> 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 -
>
>
> "Got Root?"
>
> How many software engineers does it take to change a light bulb?
> None. It's a hardware problem.
>
>
> Unix is user friendly. It's just very particular about who it's friends are.
> WINDOWS: Will Install Needless Data On Whole System
> MICROSOFT: Most Intelligent Customers Realize Our Software Only Fools
> Teenagers.
>
>
> A ntennas
> P oorly
> P laced
> L acks
> E ngineering
>
> The best way to accelerate a computer running Windows is at 9.81 m/s².
>
> "I get paid to support Windows, I use Linux to get work done."
>
>
>
> 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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