[Allstar Digital] MMDVM Lessons learned so far.

[Steve Zingman]

 http://mmdvm.blogspot.com/2016/01/levels-and-deviation.html?m=1


-------- Original message --------
From: Corey Dean <n3fe at repeater.net>
Date: 01/09/2016 6:41 PM (GMT-05:00)
To: Digital linking using Asterisk and app_rpt <
allstar-digital at lists.keekles.org>
Subject: Re: [Allstar Digital] MMDVM Lessons learned so far.

That is the part I was missing.  Thank you!  That clarified things up for
me!

Sent from my iPhone

> On Jan 9, 2016, at 6:33 PM, REDBUTTON_CTRL <jrorke at cogeco.ca> wrote:
>
> Since DMR uses a wide band channel to 2 the 2 slots, therefore you will
need a radio that does wide band (5khz/25 khz).
>
> Other C4FM modulation schemes use narrow band like P25 and (Con)fusion.
> RQ
>
>> On 1/9/2016 5:57 PM, Steve Zingman wrote:
>> We have not narrowed that down yet. We are Using Tait T2xxx radios. One
of the things we need to try is both the wide and narrow setting. We have
not et even confirmed that 3.88 is optimal.
>>
>>> On 01/09/2016 05:52 PM, Corey Dean wrote:
>>> So I am assuming a wide band transmitter instead of narrow?
>>>
>>> Sent from my iPhone
>>>
>>>> On Jan 9, 2016, at 5:47 PM, Steve Zingman <szingman at msgstor.com> wrote:
>>>>
>>>> Mike and I have been working with the MMDVM and the Home Brew Repeater
code for a couple of weeks.
>>>> It's very early in the process and I think that unless you like to try
to hit at least 3 moving targets, I suggest people wait. The MMDVM is a
Arduino  Due and a small analog board. The modem firmware runs on the Due.
The analog board does some filtering and level control. We are running a
early prototype board from Jim KI6ZUM. Jim has some new boards in the
works, so right now waiting or build your own is the only choice.
>>>>
>>>> The software is early and buggy, as any new software is. Jonathan
G4KLX has done a phenomenal job so far and it only will get better. The
test software ONLY works in duplex mode, which is a problem because if your
transmit data is not right, you will not get too far with receive. Kind of
a catch 22. Jonathan G4KLX says that the deviation should be 3.88 KHz. So
on my IFR 1200S that works out to a hair under 4KHz. (analog meter). Now
that we have the transmit working OK, not great but OK, we will start on
receiver.
>>>>
>>>> More to follow.
>>>>
>>>> For INAD, Steve N4IRS
>>>> --
>>>> "Anything is possible if you don't know what you are talking about."
>>>> 1st Law of Logic
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