Re: [PLUG] PLUG Fusion room or DMR Talkgroup

[Jim Fisher <jedijf@myfisher.org>]

DMR HOSELINE example TAC310: https://hose.brandmeister.network/group/310/

On 5/17/19, Keith C. Perry <kperry@daotechnologies.com> wrote:
> I think we're talking about two different experiences here because we're
> using pi-star differently.  I just did some testing and found out what was
> going on.
>
> Dynamic talkgroups, if you don't explicitly disconnect from them (I don't)
> are kept until timeout on the BM master for you.  You can see which ones you
> are connected to under "Active BrandMeister Connections" when you click
> "Admin".  In order to have static talkgroups, you have to login to the
> BrandMeister self-care portal.  From there you can add the talkgroup(s) you
> want static.
>
> Now that I've seen that in action again, I'm not sure I want to always
> switch to another talkgroup I have static just because what I'm listening to
> is idle.  I have to think about that.
>
> "That is part of it.  Another big issue is with mic gain.  Most DMR
> handsets do not have a mic level meter, and hams have this tendency to
> overdrive mic audio on every mode, even though just about every
> license question pool has questions about why you shouldn't do that
> and why it is actually illegal on some modes, and the DMR ID
> registration webpage makes you swear by your firstborn to turn down
> your mic gain."
>
> LOL, yea, that's part of developing a consistent technique for your mic
> discipline.  Not all mics are created equal as well.  I could tell you tell
> you stories about a working with vocal artists and trying to explain to them
> what they are doing wrong in terms of mic placement.  Its funny, just like
> when I went to digital recording in my studio, I can tell when people are
> probably overdriving their mics on the radio.
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> Keith C. Perry, MS E.E.
> Managing Member, DAO Technologies LLC
> (O) +1.215.525.4165 x2033
> (M) +1.215.432.5167
> www.daotechnologies.com
>
> ----- Original Message -----
> From: "Rich Freeman" <r-plug@thefreemanclan.net>
> To: "Philadelphia Linux User's Group Discussion List"
> <plug@lists.phillylinux.org>
> Sent: Friday, May 17, 2019 8:39:58 PM
> Subject: Re: [PLUG] PLUG Fusion room or DMR Talkgroup
>
> On Fri, May 17, 2019 at 6:01 PM Keith C. Perry
> <kperry@daotechnologies.com> wrote:
>>
>> That is not my understanding of how dynamic and static talkgroups work-
>> that's a repeater terminology but if there is a way to do put a list of
>> talksgroups in to monitor, I might try doing that so I don't have to
>> switch to different one's manually when I think to do so.
>
> In Brandmeister repeaters and hotspots are basically treated the same.
> The main difference is that hotspots generally only support one
> timeslot and are simplex.  You can have static and dynamic groups on
> either.
>
> The network sends the hotspot/repeater any traffic on any dynamic or
> static talkgroups it is subscribed to.  For dynamic talkgroups after a
> timeout period it is unsubscribed, and static talkgroups are, well,
> static.  In the event of a conflict I think BM decides what to send to
> the hotspot based on what channel was last active and whatever other
> rules it has.  The hotspot just broadcasts whatever it gets, so if it
> has 10 groups subscribed each call might be going out on a different
> group.  Then the radio unsquelches when it hears a call on the
> selected group, or it unsquelches for everything if it is set to
> monitor/promiscuous.
>
>>
>> Yea, its the loss factor that you don't need much of to be unreadable.
>> That happens quite a bit on talkgroup 91 with international stations and
>> of course mobile users.  Part of that is operating procedure too.  People
>> don't realize with digital you really do need some lead time so that the
>> communication goes out clean and consistent.
>
> That is part of it.  Another big issue is with mic gain.  Most DMR
> handsets do not have a mic level meter, and hams have this tendency to
> overdrive mic audio on every mode, even though just about every
> license question pool has questions about why you shouldn't do that
> and why it is actually illegal on some modes, and the DMR ID
> registration webpage makes you swear by your firstborn to turn down
> your mic gain.
>
> On SSB more audio gain does get you more output power, though if the
> compression goes crazy you get less intelligibility (without
> compression you overdrive the finals which is even worse).  On FM more
> audio gain causes over-deviation, which is illegal and probably gets
> clipped on the receiver's filter reducing intelligibility, and it
> doesn't actually increase power at all.  On any digital mode too much
> audio gain causes clipping, which just about everybody on this list
> has probably heard and it basically just makes you about as
> intelligible as a buzzsaw.
>
> One thing I do like about the md380tools firmware is that you can
> display a mic level when you're transmitting, and it always ends up
> being too hot even with the lowest settings, causing me to move the
> mic away from my mouth, which I'm sure everybody listening
> appreciates.  I suspect all those cheap DMR radios have the same
> problem, and you just don't realize it when you're transmitting unless
> you get an honest signal report.
>
> --
> Rich
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-- 
jim fisher
Jedijf
AJ3DI
www.aj3di.com/
www.myfisher.org

"Do, or do not. There is no 'try.'"
  --  Jedi Master Yoda
___________________________________________________________________________
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