[arm-allstar] Anyone running RTCM?

[Sam Skolfield]

Dave,

My system is VHF high band, but I have no transmitters.

The other system I make reference to was UHF. While it's simulcasting
wasn't great, it was better others, and it's voting was/is FLAWLESS.
Amazing squelch action as well. Not just your run-of-the-mill half-ass DSP
squelch masked by audio delay.





On Fri, Sep 11, 2015 at 12:07 AM, David McGough <kb4fxc at inttek.net> wrote:

>
>
> Hi Sam,
>
> Thanks for the info. I figured that loud overlapping TX signals would
> cause problems, even with the TX frequency synchronized.  I expect getting
> a simulcast system working acceptably well on VHF, particularly low-band,
> might be about impossible....I guess that's one advantage the higher
> frequencies (800MHz and above) have--controlling the antenna pattern and
> signal strength in any given direction is MUCH easier!
>
> BTW, what band was were you all using? ...Again, just wondering. I'm
> building a wide coverage 10M repeater right now.
>
> 73, David KB4FXC
>
>
> On Thu, 10 Sep 2015, Sam Skolfield wrote:
>
> > David,
> >
> > The warble was bad with overlap ( sounded like CTCSS warbling, could have
> > been carrier)
> >
> > A note to all - No matter how fast your "network" is ( all your stuff
> could
> > be on a table in front of you, with nothing but CAT-5 cables and an
> > ethernet switch), the TX buffer on the RTCM and voter.conf will not go
> low
> > enough for your users to "duplex" without echo. Period. People cried
> about
> > this on the main email group, and a firmware update was made for the RTCM
> > that lowered its minimum allowed TX buffer value, but it's still too high
> > to duplex.
> >
> > That being said, the voting action with RTCMs is SUPERIOR! Works very
> well.
> > I have a system with several receivers scattered throughout a series of
> > mountainous canyons,  tied in with 900MHz and 5GHz and it works
> perfectly.
> > Using a BBB as a server.
> >
> > 73
> >
> >
> >
> >
> > On Thu, Sep 10, 2015 at 2:15 PM, David McGough <kb4fxc at inttek.net>
> wrote:
> >
> > >
> > > Hi Sam,
> > >
> > > Just for my own curiosity, what was the problem with overlapping
> transmit
> > > sites? (I'm assuming the audio sync wasn't quite perfect?)
> > >
> > >
> > > 73, David KB4FXC
> > >
> > >
> > >
> > > On Thu, 10 Sep 2015, Sam Skolfield wrote:
> > >
> > > > It works, but not perfectly. If you have minimal overlap, it's
> > > acceptable,
> > > > but once your coverage starts to overlap, it gets hairy. Typical of
> any
> > > > simulcast system to a certain extent, but perhaps a little worse than
> > > > others.
> > > >
> > > > There is a high-level system that used to simulcast from two big
> mountain
> > > > tops using RTCMs (BIG overlap) and it was  really rough whenever you
> were
> > > > in earshot of both transmitters.
> > > >
> > > > I will say that the voting using RTCMS is absolutely fantastic. I
> have
> > > had
> > > > amazing results.
> > > >
> > > >
> > > >
> > > > On Thu, Sep 10, 2015 at 4:24 AM, Steve Wright <
> stevewrightnz at gmail.com>
> > > > wrote:
> > > >
> > > > > I just read that the RTCM simulcast multi-transmitter system
> actually
> > > > > DOESNT work.
> > > > >
> > > > > Can anyone shed light?
> > > > >
> > > > >
> > > > > S
> > > > >
> > > > > _______________________________________________
> > > > >
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> > > > >
> > > > > Visit the BBB and RPi2 web page - http://hamvoip.org
> > > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > > _______________________________________________
> > >
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> > >
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> > >
> >
> >
> >
> >
>
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>
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>
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>



-- 
KJ6QFS
Sam Skolfield
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