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Re: Re:Number of hams worldwide?



Bob,

This is the first time I have heard of APRS-Voice-Alert.
Makes sense if all NON-Digipeating stations ran a PL of 100.
It would let you know of local activity for sure!
Can APRS-Voice-Alert generate a PL somehow, or does the user just run the 
PL?
I am assuming the radio is set up with encode/decoded CTCSS.

Where can I find out more info on this?
Sounds pretty useful!

73, Scott

----- Original Message ----- 
From: "Robert Bruninga" <bruninga@usna.edu>
To: <amsat-bb@AMSAT.Org>; <kd6ozh@AMSAT.Org>; <mlhammond@charter.net>; 
<kd6ozh@verizon.net>
Sent: Saturday, October 30, 2004 5:17 PM
Subject: Re: [amsat-bb] Re:Number of hams worldwide?


> >...that means 1 in 1000 people that could be hams are.
>
> I've always used the number of 1 in 500 in the USA
>
> This means when you are driving down the interstate,
> you pass another ham on average about once every
> 10 minutes.  BUT you can go all day and not get a QSO.
>
> and just listening to "52" never works unless you are
> calling CQ every 2 minutes because of  your relative
> 140 MPH crossing speed and the short range of direct
> comms.
>
> This is why APRS-Voice-Alert works so well.  Its an
> automatic Proximity Radar that will always alert you to
> another APRS-Voice Alert station in range.  Voice
> Alert is nothing more than setting CTCSS-100 on
> the North Americal APRS frequency of 144.39 that is
> in use everywhere.
>
> Of course that frequency is wall-to-wall packets from
> digipeaters, BUT NONE OF THEM ARE USING PL-100
> except the other mobile APRS-Voice-Alert stations, who
> just so happen to be also LISTENING for voice calls
> with CTCSS-100.  So no-one hears anything on the channel
> unless they are SIMPLEX range to another APRS-Voice-Alert
> station.  Then in a crossing situation they may hear  at most
> two or three once-a-minute  "braps" which alerts them to:
>
> 1) Another HAM in range LISTENING with CTCSS-100
> 2) You KNOW he has the radio on and is listening
> 3) You KNOW he is in range
> 4) You KNOW he is looking for a QSO
> 5) Bingo, instant QSO for the 3 or 4 minutes you are in range.
>
> Believe me, it sure beats 52.  And EVERY APRS operator
> is on 144.39 so there is no ambiguity.  So even if you are
> not a user of APRS, but are on a LONG drive and get
> tired of hearing nothing on "52".  Then simply QSY your
> voice rig to 144.39 and set CTCSS-100.   All the packets
> will be silenced and you wont hear anything.  But if you
> DO hear a packet, then it is from soneone else who
> IS LISTENING for a voice call!
>
> Of course, onnce you make contact, then QSY to "52"
> so that you dont have to fight all those packets!
>
> de Wb4APR, Bob 
----
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