[App_rpt-users] Odd CTCSS behavior on RTCM

Thu Jun 12 18:53:05 UTC 2014

I have a working RTCM on one of the machines I take care of.

My setting are:

S/W Version: 1.46 03/04/2014

12 - External CTCSS (0=Ignore, 1=Non-Inverted, 2=Inverted) (1)

13 - COR Type (0=Normal, 1=IGNORE COR, 2=No Receiver) (0)

When I do a menu 98 with no signal I get

GPS Lock: 0

Connected: 1

COR: 0

EXT CTCSS IN: 0

PTT: 0

RSSI: 0

With a signal no pl I get

GPS Lock: 0

Connected: 1

COR: 1

EXT CTCSS IN: 0

PTT: 0

RSSI: 118

With a signal with PL I get

GPS Lock: 0

Connected: 1

COR: 1

EXT CTCSS IN: 1

PTT: 1

RSSI: 160

So this shows that CTCSS works fine here.

From: app_rpt-users-bounces at ohnosec.org [mailto:app_rpt-users-bounces at ohnosec.org] On Behalf Of Mark Johnston
Sent: Thursday, June 12, 2014 2:03 PM
To: Chris Bunting
Cc: app_rpt-users at ohnosec.org
Subject: Re: [App_rpt-users] Odd CTCSS behavior on RTCM

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 <mailto: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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