[aprssig] Regional Voice Alert VHF/UHF Plan C.
Robert Bruninga
bruninga at usna.edu
Wed Dec 5 12:44:45 EST 2007
OK, plan C (for the alternate APRS local channel to support
priority local emergency and special event operations).
This one is just a single VHF radio, and a KPC-3+TNC and a
simplex voice recorder (About $10?). Lets see if this works...
1) RX on 144.99, TX on 144.39 normal digi
2) Voice recorder records any PL100 VOICE on input
3) KPC3+ mute ckt ignores recording of PL100 packets
4) Voice recorder repeats only voice on 144.39
This gives:
A) Priority to local APRS data on 144.39
B) QRM free higher reliability local APRS input
C) Ability for VAlert to cover broad area
D) All of this on Band-A of D700 or using only a single band
APRS radio.
E) D700 band B's can support all other comms.
F) Lets local APRS operators shift 144.39 +600 in support of
this emergency event or special event and have priority
communicaitons which includes the occasional area-wide Voice
Alert. All on Band A of a D700 or D7 or on a single band VHF
APRS radio.
Bob, Wb4APR
> -----Original Message-----
> From: Robert Bruninga [mailto:bruninga at usna.edu]
> Sent: Wednesday, December 05, 2007 12:00 PM
> To: bruninga at usna.edu; 'TAPR APRS Mailing List'
> Subject: Regional Voice Alert VHF/UHF Plan B.
>
> Still pondering... another idea for the ultimate local
dedicated
> APRS support system using a pair of VHF and UHF transceivers
and
> KPC-3+ TNC is to configure them for this arrangement:
>
> 1) VHF and TNC Acts as 144.99 ==> 144.39 digi
> 2) UHF input gives regional Voice Alert out on 144.39
> 3) Mobile VAlert from 144.99 goes to UHF voice output
>
> Here is what you get:
>
> Netcon or anyone can call everyone in the region on Voice
Alert
> via the UHF input. Mobiles can QSY their A-Band and APRS to
the
> 144.99 input (keeping 144.39 output so they still see
> everything). But being on the 144.99 local input, their
packets
> have 95% less QRM and are much more reliable and when they are
> digipeated onto 144.39, they get local priority.
>
> While their mobile TX is on 144.99 (where the channel is now
95%
> clear), any of their Voice Alert transmissions on their radio
A
> side will not QRM anyone on 144.39, but their voice will be
> relayed on the UHF output.
>
> So these APRS operators now have full PRIORITY local APRS
> digital communications AND local wide area APRS VOICE (back
> channel) communications on the A side of their radio and their
B
> side can still be used for their other needs.
>
> Oops.. I guess they need to listen to the UHF channel to hear
> the other non-simplex APRS voice Alert comms from the cross
band
> repeat. So this kinda takes away from the freedom of band B.
>
> Hummh.. Need a plan C. Next message...
>
> Bob, WB4APR
>
>
> > -----Original Message-----
> > From: aprssig-bounces at lists.tapr.org
> > [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Robert
> Bruninga
> > Sent: Wednesday, December 05, 2007 8:19 AM
> > To: 'TAPR APRS Mailing List'
> > Subject: RE: [aprssig] Solar Powered Digi's and Voice Alert.
> >
> > >> One way to greatly facilitate TEAM operation on
> > >> APRS is to put up a cross band transceiver for
> > >> area-wide VOICE alert. The input is on UHF
> > >> (with PL) and the output is on the APRS channel
> > >> with PL-100.
> >
> > > ... Do you envisage it being used like a wide area
> > > pager or something like that?
> >
> > Hey, that is a pretty good analogy. In fact, here is
another
> > idea to greatly improve APRS performance in a SPECIFIC
> > geographical area, such as to support your local ARES/RACES
> > county communications:
> > 1) Install the above cross band repeater for voice alert
> > 2) Add a DIGI at the same location on 144.99 (if avail)
> >
> > When a local net is activated, the call goes out on Voice
> alert
> > asking everyone to QSY to the local APRS packet channel.
And
> > the voice alert cross band can also output on that channel.
> > Here are benefits:
> >
> > 1) The local channel does not have the QRM from out of area,
> so
> > the channel load drops to only 5% of what it normally is.
> This
> > improves APRS reliability by a factor of 20 or more, even
low
> > power trackers can
> > Be operating there without being clobbered.
> >
> > 2) With the 95% additional free-air time, the brief
> voice-alerts
> > will have a much much less chance of colliding with anyone.
> >
> > 3) Mobile D700 users now get full voice alert info, full
local
> > APRS coverage, and their BAND-B is still available for their
> > other needs.
> >
> > Something like that.
> >
> > Bob, WB4APR
> > >> This way, voice alert is extended far beyond
> > >> simplex to actually cover your entire local
> > >> area. This way, all APRS stations can
> > >> instantly make a voice alert to ALL stations
> > >> in the area, no matter what they are doing
> > >> with their other radios.
> > >>
> > >> Of course, this is pandora's box. Over use,
> > >> by one or more individuals could drive everyone
> > >> nuts and cause them to turn off voice alert.
> > >> But in my mind, it is a GREAT backup emergency
> > >> alert system. If rarely used...
> > >>
> > >> Think of it as an APRS 911 system.
> > >> IE, never used, but available for when you
> > >> really need it.
> >
> >
> > _______________________________________________
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> > aprssig at lists.tapr.org
> > https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> >
>
>
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