[App_rpt-users] Problem getting RTCM to process received audio

Sat Nov 25 17:33:55 UTC 2017

Yes, I believe I am feeding unsquelched audio to the RTCM.  How do you
properly do the calibration procedure?

-Doug-

On Sat, Nov 25, 2017 at 9:28 AM, Jesse Lloyd <ve7lyd at gmail.com> wrote:

> Are you feeding unsquelched discriminator audio to the RTCM?
>
> The calibration needs to work before the RTCM will squelch properly.
>
> Cheers,
> Jesse
>
> On Nov 25, 2017, at 10:18 AM, Doug Kingston <dpk at randomnotes.org> wrote:
>
> I am trying to prototype a RTCM based voting system with 2 RTCMs.
> I am using two JSLM2 Data Radios as transceivers.
> Using HP8920B service monitor to drive the radios.
>
> Good news: I can get both RTCMs and both radios to transmit.  Test tones
> sound fine. Deviation good.
>
> Bad news: I can't get the RTCMs to register the incoming audio signal.  There
> is no CTCSS in these radios, so that line is not connected.  I have no COS
> signal connected either.  Just audio in/out and PTT to the radio.
>
> I have confirmed the radios are receiving and are sending audio to the
> RTCMs using an oscilloscope.  If anything the audio is way high in level.
> I measured 1v peak-to-peak when I think the RTCM is expecting 200mV.  Tried
> the 20db pad with no effect.  My suspicion is that the RTCM is a
> high-impedance input so the voltage is floating up in the absence of
> appropriate load (say from a 600 or 2k ohm).
>
> Second, I never get the green receive light on so I suspect there is
> actually some squelching or some such going on that is gating the audio
> signal off.
>
> Third, I have not been able to the the Squelch calibration or Diode
> calibration to behave.  Does this require the diagnostic cable described in
> the interface to be used?  The procedure is not documented well.
>
> I would love to see a know working config and wiring setup to confirm what
> I have done.
>
> -Doug-
>
> Current settings:
>
> Select the following values to View/Modify:
>
> S/W Version: 1.51 08/08/2017
> System Uptime: 2095.0 Secs
> IP Address: 192.168.0.75
> Netmask: 255.255.255.0
> Gateway: 192.168.0.1
> Primary DNS: 192.168.0.1
> Secondary DNS: 192.168.0.1
> DHCP: 1
> VOTER Server IP: 104.197.124.184
> VOTER Server UDP Port: 667
> OUR UDP Port: 667
> GPS Lock: 1
> Connected: 0
> COR: 0
> EXT CTCSS IN: 1
> PTT: 0
> RSSI: 0
> Current Samples / Sec.: 8000
> Current Peak Audio Level: 112
> Squelch Noise Gain Value: 0, Diode Cal. Value: 0, SQL pot 0
> Current Time: Sat  Nov 25, 2017  17:14:12.740
> Last Rx Pkt System time: <System Time Not Set>, diff: -198435452 msec
> Last Rx Pkt Timestamp time: <System Time Not Set>, diff: 0 msec
> Last Rx Pkt index: 0, inbounds: 0
>
> 1  - Serial # (1162) (which is MAC ADDR 00:04:A3:00:04:8A)
> 2  - VOTER Server Address (FQDN) (xxx.org)
> 3  - VOTER Server Port (667),  4  - Local Port (Override) (0)
> 5  - Client Password (xxx1),  6  - Host Password (xxx2)
> 7  - Tx Buffer Length (3000)
> 8  - GPS Data Protocol (0=NMEA, 1=TSIP) (0)
> 9  - GPS Serial Polarity (0=Non-Inverted, 1=Inverted) (0)
> 10 - GPS PPS Polarity (0=Non-Inverted, 1=Inverted, 2=NONE) (0)
> 11 - GPS Baud Rate (4800)
> 12 - External CTCSS (0=Ignore, 1=Non-Inverted, 2=Inverted) (0)
> 13 - COR Type (0=Normal, 1=IGNORE COR, 2=No Receiver) (0)
> 14 - Debug Level (0)
> 15  - Alt. VOTER Server Address (FQDN) ()
> 16  - Alt. VOTER Server Port (Override) (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 (600) (approx 200 ns, 5 = 1us, > 0 to ENA SC)
> 97 - RX Level,  98 - Status,  99 - Save Values to EEPROM
> i - IP Parameters menu, o - Offline Mode Parameters menu
> q - Disconnect Remote Console Session, r - reboot system, d - diagnostics
>
>
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