[aprssig] 6 m APRS

Ev Tupis w2ev at yahoo.com
Thu Mar 9 07:55:05 CST 2017


For Sale: Motorolla Syntor 6 meter FM transceiver
* ALREADY MODIFIED FOR 1200 BAUD PACKET OPERATION
* Tuned to 53.530 MHz simplex
* 100 watts
$100+shipping from zip code 14420

Reply direct if interested.
Ev, W2EV

      From: Kenneth Finnegan <kennethfinnegan2007 at gmail.com>
 To: TAPR APRS Mailing List <aprssig at tapr.org> 
 Sent: Thursday, March 9, 2017 1:17 AM
 Subject: Re: [aprssig] 6 m APRS
   
6m APRS is a pretty interesting idea. I try and keep my events on UHF repeaters, but we inevitably end up needing VHF simplex frequencies (I shake a fist at the CA UHF band plan), so getting something off of 2m/440 would be pretty nice.
Just to make sure, we're talking about 1200baud Bell 202 on a 25kHz channel here? 50.620MHz is listed as the packet calling frequency, but I suspect anyone building an APRS network on it would be more use on that frequency than even the packet calling frequency has seen in the last decade anyways, and APRS is kind of packet calling-ish, so we're ok with that? I've gotten chewed out for putting a 20 minute interval voice beacon on 2m calling before, but as far as I can tell there's no winning on 146.520 anyways...
I've spent a few minutes trying to sketch out a few different configurations you might want for cross-routing between 144.390 and 6m like Jess is talking about, and I keep coming back to the fact that APRS is meant to be local only, so there isn't much argument for dense mode flooding between 144.390 and a longer range band. I also don't think I'd recommend users to start setting up their trackers with 7 hop paths to begin with. That just seems like something that would ultimately want to be changed to a 2 hop path in the unlikely scenario a network actually materializes on 50.620MHz. 
Sharing objects/messages between EOCs seems like the most likely use case (after headless trackers), which I think is in line with Bob's proposal for it being primarily a headless tracker band. A network consisting entirely of headless trackers and terminals/I-gates on the network at EOCs for viewing the headless trackers and trading messages with the limited number of other terminals on the band. No weather stations, no 
There might be an argument for routing traffic from the 6m net to 144.390 with the entire path trapped (so it only goes out direct), but that's probably only for areas for want of more traffic on 144.390. Any area with already decently mature APRS traffic levels would probably only use 6m as an I-gate-only net and rely on implicit RF-gating to route between the two bands at best.

--
Kenneth Finnegan
http://blog.thelifeofkenneth. com/
On Mon, Mar 6, 2017 at 8:04 AM, Robert Bruninga <bruninga at usna.edu> wrote:

We think that 6m APRS is an ideal applicataion... especially when 100W
mobile low-band surplus radios are so cheap.  A guy got 100 of them for $10
each.  But then he had to modify them and add TNC's.

Although this is ideal for mobile for longer distances than 2m, the problem
is there will never be enough infrastrucuter for travel out of area except
in local areas that embrace it.

A better idea for 6m radio is for emergency APRS communications at all
operatinos centers.  Hams will want to use 2m and 70c bands for voice and so
we do not want APRS messaging and tactical situational awareness objects to
interfere.

SO best to have 6m APRS at all emergency comms sites as a 3rd band for
interchange between all emergency comm sites.  The sites will of course,
MONITOR 144.39 national frequency so they can see all incoming APRS tactical
situation, but their messaging between emergency centers on 6m would not
interfere with other voice ops on 2m and 70cm.

Bob, WB4aPR

-----Original Message-----
From: ve2gqf at gmail.com [mailto:ve2gqf at gmail.com]
Sent: Monday, March 06, 2017 10:46 AM
To: WB4APR at amsat.org
Subject: 6 m APRS

Hi Bob,

My name is Gilles, VE2GQF and live in Sherbrooke, Québec and an aprs
enthousiat since the begening !

We are interested to try APRS on 6 m band in Quebec province. Is it a good
idea ? Is this mode on this band is always used ?  Internet seem to be have
no large information about it ?

I'm going to Florida in few days, is there always any 6 m APRS Igate near
Washington and  Georgia - If yes I will transmet APRS 6 m beacon in my trip.


Thank's for your answer and sorry if my english is not good, this is not my
first langage.


73's Gilles ve2gqf

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