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

Sat Nov 25 22:28:10 UTC 2017

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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