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ZL3AI > APRDIG 21.06.03 18:50l 243 Lines 10445 Bytes #999 (0) @ WW
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To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Friday, June 13, 2003.
1. Re: VOICE ALERT for Europe
2. PIC accessory for Mobile APRS
3. Re: VOICE ALERT for Europe
4. Better than 52 simplex
5. Re: aprssig digest: June 12, 2003
6. Re: VOICE ALERT for Europe
7. Re: VOICE ALERT for Europe
8. Re: Better than 52 simplex
9. Re: PIC accessory for Mobile APRS
10. ProtoPath List - WinAPRS v2.61
11. Re: PIC accessory for Mobile APRS
12. Re: ProtoPath List - WinAPRS v2.61
13. test - please ignore this message
14. findU network problem
15. Re: VOICE ALERT for Europe
16. Digis and UI-digis
17. APRS+ KipSS & AGWPE Info
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Subject: Re: VOICE ALERT for Europe
From: Alex <kr1st@amsat.org>
Date: Fri, 13 Jun 2003 07:26:50 -0400
X-Message-Number: 1
Thanks, Wes. I thought the problem was something bigger than that.
73,
--Alex KR1ST
Wes Johnston wrote:
>What I'm trying to say is that a HOME station can accidentally send a PL
>tone. The will cause mobiles to think they are hearing another mobile when
>in fact it's a home station (and could also be unmanned). It just adds to
>the QRM.
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Subject: PIC accessory for Mobile APRS
From: Bob Bruninga <bruninga@usna.edu>
Date: Fri, 13 Jun 2003 09:40:23 -0400 (EDT)
X-Message-Number: 2
Here is the ideal PIC accessory for Mobile APRS
This is for the D700 (After my annual 1600 mile round trip to Alabama where
I always have a chance to experience APRS mobile and RE-THINK some
things.)...
Back when I always had APRSdos in the car, APRS did exactly what it was
designed to do and what I wanted and needed while mobile. But now that I
only travel with the D700, I realize I am missing a lot and can think of
some easy travel aids:
Imagine a three button device on the dashboard. It performs three things:
1) Automatically places ur band-B freq into ur APRS status text
2) Will QSY your radio to any frequency sent to you by someone
else in their status text
3) Will beep whenever you are on a collision course with another
APRS mobile. Or within X miles
Driving for 800 miles down I-81 and I-24 from Maryland to Alabama, it was
pleasing to see almost 50% of the 40 stations on my D700 on Friday evening
late were mobiles and a large number of them were truckers. Many were 100
to 200 miles away but a dozen or so were more or less along the same route
and half of them likely (over the next 8 hours) to pass right by us.
Guess what. I was only able to raise one of them. None had Voice alert.
There was no way to know what freq they were on. We just passed in the
night. The one, stumbled across me, becuase I had my Band-B in my Status
text. Again, his initial reaction to my explaination of Voice Alert was
disinterest and rejection. But since I was mostly explaining it to another
APRS fixed station, after a half hour of tidious explaination, the fixed
station finally figured it out, and the trucker who had long since signed,
came back on and said... Oh! Now I see! (he'd apparently continuted to
listen. He couldnt wait to set it up on his next stop and tell his other
trucker buddies.
From Baltimore MD, to Northern Alabama, 850 miles I never once heard ANY
voice-alert packet. So no one can complain about the noise! (Voice Alert
is a MUST for the open road).
What I now realize is that apparently, Voice Alert as a systematic means of
having a back-channel on which to contact another APRS mobile op, just
doesnt come across obviously on first explaination.
WELL ANYWAY! The point of this email is the Collision Detection PIC
Processor.
COLLISION DETECTOR: Rather than scanning up and down in the LIST of my
D700, I quickly realized how neat it would be to have something always
looking at new posits as they came in, and comparing them to my course and
speed and then instantly assessing if they were on a collision course and
then BEEPING me. This way, I'd know of a "meeting" situation minutes or
hours in advance. When a new posit comes in, it beeps as follows in Morse
Code:
._ . Approaching. >100 miles 50 minutes notice
._ .. Approaching, < 50 miles 25 minutes notice
._ ... Approaching, < 25 miles 12 minutes notice
._ .... Approaching, < 10 miles 5 minutes notice
._ ..... Approaching, < 5 miles 2 minutes notice
It also has a radar feature that beeps whenever any station not just a
mobile gets within 10 miles (simplex). Then it beeps "P" for Proximity.
The Beep lets you glance at the front panel of the radio to see who...
STATUS=BAND-B: This is one of the buttons. Whenever you QSY your radio
while driving and find a new freq to monitor, just push the STATUS=BAND-B
button and it will instandly read the freq in band B and stuff it into your
STATUS text. This way, APRS is always telling everyone where you are
operating.
AUTO-QSY: This button when pressed causes the PIC to scan the top station
in the list for a FREQUENCY and then to QSY the band B to that frequency
and PL. If the top most station does not have a frequency, then it moves
on down the list until it finds one. This is because you may hear and see
someone new come on the front panel of the radio, but you may not react
fast enough, and by then the station you want to talk to has moved down in
the list.
This little device sits on your dashboard in a mini-radio shack box just
large enough for the 9v battery to pwer it. It only needs two buttons and
an ON/OFF switch and a LED and a Beeper. (though I'm sure we will think of
lots more for it to do.)... It has only a 3 conductor wire to the radio
where it is connected to the radio serial port. Thats all there is to it!
Now, who wants a new PIC project
de WB4APR@amsat.org, Bob
PCsat WEB page http://www.ew.usna.edu/~bruninga/pcsat.html
ISS-APRS FAQ: http://www.ew.usna.edu/~bruninga/iss-faq.html
CUBESAT Designs http://www.ew.usna.edu/~bruninga/cubesat.html
APRS LIVE pages http://www.ew.usna.edu/~bruninga/aprs.html
APRS SATELLITES http://www.ew.usna.edu/~bruninga/astars.html
MIM/Mic-E/Mic-Lite http://ssdl.stanford.edu/mims/
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Subject: Re: VOICE ALERT for Europe
From: Bob Bruninga <bruninga@usna.edu>
Date: Fri, 13 Jun 2003 09:53:37 -0400 (EDT)
X-Message-Number: 3
On Thu, 12 Jun 2003, Alex wrote:
>Perhaps folks are chasing a ghost? Is using a 100Hz tone for CTCSS in
>Europe a real problem?
Yes. We in the USA are surrounded by 60 Hz harmonics in everything RF.But
in Europe they are surrounded by an RF environment saturated with 50 Hz
harmonics.
The reason for CTCSS-100 is to keep your squelch CLOSED all the time unless
someone calls you on voice alert. If you run CTCSS-100 in Europe your
squelch opens up falsely sometimes due to all the 50 Hz harmonics.
Thus, it will be muchbetter to run voice alert 136.5 in Europe. I wish I
had thought of this before proposing 100 for USA...
bob
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Subject: Better than 52 simplex
From: Bob Bruninga <bruninga@usna.edu>
Date: Fri, 13 Jun 2003 10:09:21 -0400 (EDT)
X-Message-Number: 4
APRS Voice Alert is not just for APRS users. It is for any mobile HAM
in simplex range of us that wants to contact us. It should become common
knowledge for all mobile operators.
---------- Forwarded message ----------
From: Bob Bruninga <bruninga@usna.edu>
To: amsat-bb@AMSAT.Org
Better than 52. Travelers Mobile Radar!
If you're on a long trip and cant find anyone to talk to just activate
your mobile HAM "radar" detector. Many APRS mobiles run what is called
"voice alert" on 144.39 MHz. This means they are LISTENING with CTCSS
100. Thus, they never hear anything unless someone is within SIMPLEX
range of them and calls with CTCSS-100.. Its like a radar detector. If
you pass within simplex range of someone else with VOICE-ALERT, even if
they are not talking, you will hear an occassional ping because their once
a minute packet is also transmitted with CTCSS-100. (136.5 europe).
Normally this is just for APRS mobiles, but I just realized that even if
you are not running APRS, but just want to see if anyone is in simplex
range while driving, anyone can tune there and listen. If you hear a
packet break your CTCSS 100 squelch, then you know he is in SIMPLEX range
and he is also LISTENING on the speaker for a call with PL 100.
This is better than 146.52, because of the automatic "pings" by each such
mobile. You can drive all day listening to 52 and pass within range of
dozens of others, but if no one calls CQ once every two mintues or so, you
may never find each other. (Two cars passing at 60 MPH are beyond mobile
range in 5 minutes.
With APRS Voice Alert you have three guarantees:
1) One of his radios is ALWAYS ON.
2) One of his radios is ALWAYS tuned to 144.39
3) If he has set VOICE ALERT, then he has the VOLUME UP and
will hear you if you set CTCSS-100.
But if you call on 144.39 voice alert, you MUST state "calling on Voice
Alert", otherwise, he will assume you came in on his normal voice radio
and he will come back to you, but on the other radio because he has no way
of knowing otherwise.
Note also that you must set CTCSS 100, or you will be driven crazy by all
the packets. Remember, VOICE ALERT is only a CALLING channel. You must
immediately QSY to a voice channel for QSO. 144.39 is a packet channel
only. This Voice Alert process is only a convenience for mobile
operators.
NOTE, Never set PL 100 from a fixed APRS station. No one wants to hear
your pings unless you are STITTING THERE ACTIVELY looking for a QSO. In a
mobile, if the APRS rig is on, he is there and his volume is up and he is
listing. Thus VOICE-ALERT is considered to be a "live" process only.
Just what APRS was designed to be in the first place.
de WB4APR@amsat.org, Bob
PCsat WEB page http://www.ew.usna.edu/~bruninga/pcsat.html
ISS-APRS FAQ: http://www.ew.usna.edu/~bruninga/iss-faq.html
CUBESAT Designs http://www.ew.usna.edu/~bruninga/cubesat.html
APRS LIVE pages http://www.ew.usna.edu/~bruninga/aprs.html
APRS SATELLITES http://www.ew.usna.edu/~bruninga/astars.html
MIM/Mic-E/Mic-Lite http://ssdl.stanford.edu/mims/
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