[arm-allstar] Anyone running RTCM?

[Chuck]

The  delay necessary depends on the network delay of the worst site.  No
audio is lost during the delay as it is in a buffer.
If all sites are connected via point to point wireless data 5.6Ghz, then
the network delays are minimal and the overall delay may only be a couple
hundred milliseconds at most, but if you try using the Internet to
interconnect sites then variable Internet delay could require several
hundreds of milliseconds overall delay.  On my system using good quality
Internet connections we usually only hear one syllable of our own
transmission on unkey, if we talk up to the unkey.  But if you stop talking
0.2 seconds before unkeying then you don't hear yourself.  When we were
using the 5.6 Ghz point to point links it was less then a syllable that
could be heard. (lightning took out the 5.6Ghz system so we fell back on
our backup Internet connectivity)
The voting is flawless if the RTCM's are properly connected to the
discriminator of the radios, and the setup instructions are followed.
There is alternate code available to eliminate squelch closing noise if you
don't like the default.
Chuck WB9UUS


On Thu, Sep 10, 2015 at 4:18 PM, Mike / W5JR <w5jr.lists at gmail.com> wrote:

> I want to know how bad (long) is the delay from a person speaking until
> the audio appears on the transmitter. From all of the info available to me
> - including having previously owned an RTCM - it seems like a second or
> more. I'm pretty sure our club users would not like hearing a snippet of
> their own voice after unkeying and unlikely to embrace it. However,
> improved handheld access could rule the day. And we don't have "wired"
> internet at the repeater site further exacerbating the observed delay.
>
> tnx
> Mike / W5JR
> Alpharetta GA
>
> On Sep 10, 2015, at 4:41 PM, Chris Zenchenko <wb9rsq at gmail.com> wrote:
>
> I’d love to hear of some nodes running the voting. I have no interest in
> multiple transmit sites but the voting could really make a difference.
>
> I’ve never heard a good analog controller based one yet.
>
> Nobody takes enough care to balance the audio and match the receiving and
> transmitting equipment.
>
> Even slight differences in models or levels makes voting sound poor to me.
>
> If you have a channel with a longer path you get noise and you can usually
> tell when a system votes to that channel.
>
> Maybe the RTCM makes voting possible.
>
> I’d want to listen for days and even weeks before I plunked down dollars.
>
>
>
> *From:* arm-allstar-bounces at hamvoip.org [
> mailto:arm-allstar-bounces at hamvoip.org <arm-allstar-bounces at hamvoip.org>] *On
> Behalf Of *Sam Skolfield
> *Sent:* Thursday, September 10, 2015 3:32 PM
> *To:* ARM Allstar <arm-allstar at hamvoip.org>
> *Subject:* Re: [arm-allstar] Anyone running RTCM?
>
>
>
> 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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>
>
>
> --
>
> KJ6QFS
> Sam Skolfield
>
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