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

Sat Nov 25 22:36:50 UTC 2017

My squelch noise gain value of 0 from the output of 98 (status) seems
wrong...

On Sat, Nov 25, 2017 at 2:28 PM, Doug Kingston <dpk at randomnotes.org> wrote:

> But, I still have the original audio problem.  Tried connecting a AF
> generator with 200mv signal and still have no audio signal registering on
> the display.  I really think this is something about the squelch setting.
>
> -Doug-
>
> On Sat, Nov 25, 2017 at 12:43 PM, Doug Kingston <dpk at randomnotes.org>
> wrote:
>
>> I figured this out...
>>
>> As you said, after a reset, the RTCM defaults to DHCP.  The firmware
>> reset also resets the serial number which is used to create the MAC address
>> so your DHCP mapping will change if you change the serial number or its
>> reset (default is 1234).  Once you find the new DHCP assigned address, you
>> can telnet in, change the serial number back and the RTCM will return to
>> its original MAC address (and DHCP assigned IP normally).
>>
>> Wireshark is your friend...
>>
>> -Doug-
>>
>> On Sat, Nov 25, 2017 at 12:24 PM, Jesse Lloyd <ve7lyd at gmail.com> wrote:
>>
>>> They default to DHCP and if that fails i think its 192.168.1.11? Cant
>>> recall. I use a serial cable to get it going.
>>>
>>> Cheers,
>>> Jesse
>>>
>>> On Nov 25, 2017, at 1:02 PM, Doug Kingston <dpk at randomnotes.org> wrote:
>>>
>>> I did a Firmware Reset by setting SW2-1.  Now its lost my IP settings
>>> (not surprising).  What are the default IP settings for a firmware reset
>>> RTCM?
>>>
>>> On Sat, Nov 25, 2017 at 11:27 AM, Jesse Lloyd <ve7lyd at gmail.com> wrote:
>>>
>>>> Yup. So your levels are either too hot or too low coming in. Throw a
>>>> test tone on the receiver and measure your audio level with a scope or dmm
>>>> on the input to the RTCM.
>>>>
>>>> Cheers,
>>>> Jesse
>>>>
>>>> On Nov 25, 2017, at 12:00 PM, Doug Kingston <dpk at randomnotes.org>
>>>> wrote:
>>>>
>>>> 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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>>>>>
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>>
>>
>
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