[Allstar Digital] Off topic

[Mike Zingman]

Robert,

The video you reference is showing how the ThumbDV/DV3000 can be used for
DStar.  This has been done by several developers before, but it is not for
DMR.

Mike


On Wed, Feb 10, 2016 at 10:56 AM, Robert Newberry <N1XBM at amsat.org> wrote:

> Real cool, I do not know how to write code or software, but it seems that
> it's not hard to imagine an iPhone or Android app connected to dmrlink as a
> peer...or something similar along those lines such as iaxrpt app.
>
> If I understand things right, there is a guy on YouTube by the name of
> Budd Churchward who did something similar.
>
> N1XBM
> Apparare Scientor
> Paratus Communicare
> Allstar Node # 27086, 41540, 41812, 42086, 42658
>
> On Feb 10, 2016 10:43 AM, "Mike Zingman" <mike.zingman at gmail.com> wrote:
>
>> Since this is an ASL list, this is off topic, but may interest some
>> members.  So here goes.
>>
>> Yesterday I decided to try a simple experiment and it worked better than
>> I had expected.  I conducted my first QSO on DMR without any RF hardware at
>> all.  Basically just like the DVDongle/ThumbDV for DStar is used (WinDV or
>> DummyRepeater).  It looks like:
>>
>> Mic/Speaker on PC <---> DMRGateway <---> DMRlink <--- BM or SANDBOX
>>
>> DMRGateway talks directly with the ThumbDV to both encode and decode the
>> AMBE data.  The audio and data paths look like:
>>
>> TX - Mic audio is pulled from the sound card as 8KHZ PCM and feeds the
>> encoder.  PTT is controlled by either VOX or a keyboard toggle.  The AMBE
>> is then encapsulated in IPSC frames and passed on to DMRlink to send to the
>> network.
>>
>> RX - DMRlink sends us AMBE frames.  AMBE audio is decoded by the ThumbDV
>> and the 8KHZ PCM is sent to the sound hardware.
>>
>> This is the same as the ASL solution with USRP except that there is no
>> ASL and no USRP ;-)
>>
>> And it works!  The sound is clean.
>>
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>>
>>
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