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

Sat Nov 25 19:00:09 UTC 2017

Mine never goes solid.  It starts blinking more quickly but not as quickly
as the heartbeat LED.  I think that means the test failed.

On Sat, Nov 25, 2017 at 10:34 AM, Jesse Lloyd <ve7lyd at gmail.com> wrote:

> I flip both middle switches (2&3) down. Wait for the LED to go solid. Flip
> them back.
>
> Cheers,
> Jesse
>
> On Nov 25, 2017, at 10:33 AM, Doug Kingston <dpk at randomnotes.org> wrote:
>
> 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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