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ZL3AI > APRDIG 25.10.03 15:05l 239 Lines 8790 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Oct 23, 3/3
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: OpenTracker PCB run
From: "Scott Miller" <scott@opentrac.org>
Date: Thu, 23 Oct 2003 13:47:18 -0700
X-Message-Number: 19
Heh... just had a mental image of a Republic F-84 Thunderjet running PIC
Basic...
>You CAN do a bytecode interpreter, running on a token language stored in
>EE, which you can modify at run-time.
>I did that in an F84 a few years ago.
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Subject: Relay vs wide
From: Robbie WA9INF <mwrobertson@comcast.net>
Date: Thu, 23 Oct 2003 16:07:47 -0500
X-Message-Number: 20
I wish everyone could come to terms with the RELAY,WIDE,WIDE2-2 versus
WIDE,WIDE2-2 when mobile and driving thru different parts of the country.
I am watching K0NY-7 travel thru west bound on I-90 and he was getting
in pretty well as long as he was heard by some very well established
WIDE digipeaters..
Now he is in range only to some of our RELAYs that would get his packet
to a WIDE and he is not making it to anything!
Should we have to turn our RELAYs into WIDEs now? Or how do we get ahold
of the gentleman and tell him we still honor the original and very
sensible protocol of RELAY,WIDE,WIDE2-2
So long K0NY-7 , you were on our screens briefly, :-)
Robbie
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Subject: Re: SMART digi paths
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 23 Oct 2003 18:30:01 -0400 (EDT)
X-Message-Number: 21
On Wed, 22 Oct 2003, Ev Tupis (W2EV) wrote:
>I thought that your proposal was to assume that Smart-routing will take
>place only if requested by the transmitting station, otherwise, no
>UNPROTO re-writing would occur. If that's still true, then NOAUTO is
>not necessary.
THis is true. I guess I put it in there, because my experience so far is
that we can never get everyone to agree to anything. Thus for those
sysops that insist on doing their own mungling of other peoples paths,
they should at least respect a request to NOT mungle their path...
>If your proposal was to assume that Smart-routers will - as a default
>setting - relaunch frames with the shortest path to an IGate, then,
>IGATE is not necessary and NOAUTO becomes useful again.
>
>What is your intent, Bob? I'm a bit confused, but trying to understand.
Yes, the former. I have abandoned the idea of the premptive forwarding
or a RELAY packet to an IGate. Wes's arguments convinced me that
mungling paths is a slippery slope down which I do not want us to go...
>PS...What is "NOAUTO" an abbreviation for?
It measn do nothing automatically to this path.
bob
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Subject: Re: OpenTracker PCB run
From: "Andrew McDade" <amcdade@senet.com.au>
Date: Fri, 24 Oct 2003 08:07:29 +0930
X-Message-Number: 22
Gday,
>An AVR will do that. Mega 8 or above.
>
>Otherwise, I'm not aware of a PIC that can modify it's code space.
A 16F876 , 16F877 can modify their own code space , just to name 2 of many.
Regards .. Andrew .. VK5EX
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Subject: Re: SMART digi paths
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 23 Oct 2003 19:16:13 -0400 (EDT)
X-Message-Number: 23
On Thu, 23 Oct 2003, Henk de Groot wrote:
>LOCAL - Local only (one, maybe 2 hops depending on the terain).
>
>Note: This is different than only RELAY because that is always one hop, and
>it is different than RELAY,WIDE because that is always two hops. The number
>of hops for LOCAL depends on the terain, if you are in a vally you may need
>2hops to spread the packet to the local area, if you hit the digi on a
>hill-top you may need one hop.
But the differnce between the original sender just using RELAY,WIDE and
using RELAY,WIDE,LOCAL actually makes the path LONGER -all-the time.
SO it is a net loss. And the only time it will be used is when it hits a
smart digi? What, one in 10? For the other 90% of the time that he may
not be hitting a smart-digi, he has to have his minimum path of
RELAY-WIDE. My conclusions remains, that LOCAL as a directive is useless
when just RELAY,WIDE (the new paradigm nominal "local path") will do
just as well in the long run...
Bob
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Subject: Re: D700 data cable
From: "Shanon Lee Herron" <ka8spw@comcast.net>
Date: Thu, 23 Oct 2003 19:23:28 -0400
X-Message-Number: 24
I call it a "let go to listen" switch, not a PTT. Any lid can use a PTT,
takes experience to know how to "LGTL"...
73, Shanon KA8SPW
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Subject: RE: [amsat-bb] AO-40 data mode... APRS???
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 23 Oct 2003 19:29:36 -0400 (EDT)
X-Message-Number: 25
On Thu, 23 Oct 2003, Eric Christensen wrote:
>This brings up a good point... Is anyone doing APRS on AO-40? If not, is
>there a problem with doing that?
Here is what I want to do with AO-40 (The only long term viable satellite
in orbit right now). It uses the weak-signal PSK-31 mode to be best
compatible with AO-40:
1) On each continent (or on schedule) an APRS-SATGATE station maintains a
constant uplink which is streaming any APRS-IS traffic intended for AO-40.
2) This provides a signal that APRS users can "lock onto" whenever AO-40
is in view. Due to the high doppler of AO-40, this APRS "pilot signal"
gives them something to always find and it establishes the reference for
all other APRS users (using PSK-31). Lets say the users tune this APRS
pilot signal to 1000 Hz on their display.
3) Now then, because the frequency is clearly established only as an
offset to the pilot, this means the APRS-SATGATE will always be able to
knnow where to listen for any APRS data transmitted up to it. Lets say
then that the SATGATE listens for APRS encoded PSK-31 signals at 1500 Hz.
And any APRS data it hears there, it will inject into the APRS-IS just
like any other IGate.
4) All we need are this:
a) The satgate software to keep the pilot uplink streaming any APRS-IS
traffic intended for AO-40 on the uplink
b) USER PSK-31 software that will "LOCK" the display to a single pilot
signal and then vary its own uplink tones to maintain a constant
offset by where it see's itself in the dwonlink.
The two-markers in DIGIPAN are ideal. Hook thre red one on the pilot,
and then use the blue one to show where you want to operate. Then QSY
your radio until you land there. THen hit a "LOCK" button...
c) Then we need to re-visit the exact PSK-31 protocol for sending some
APRS data. I worked all that up back years ago, but not sure I can find
it. Is there some other standard that has evolved into standard use.
Remember, we dont need 10' accuracy when we are looking at the whole half
the earth at a time. So positions are just the 4 or 6 digit grid square.
But we do need a way to indicate that a message is to be an APRS message
for the APRS IS>.. so that it can be converted to packets at the
satgate...
Bob, WB4APR
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Subject: Re: D700 data cable
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 23 Oct 2003 19:50:15 -0400 (EDT)
X-Message-Number: 26
On Thu, 23 Oct 2003, Charles H. Rahe, II asked about the Kenwood D700:
>Also can the internal TNC and an ext. TNC be used at the same time?
Yes, as the PCSAT command station, I have an external KPC-9612 connected
to the DIN connector for both 1200 and 9600 baud. This combined with the
internal 1200/9600 baud TNC, gives me 3 simultaneous data streams from
PCsat that I can collect at the same time.
PCsat (and so will PCSAT2) has two separate downlinks and each downlink
can have 1200 and 9600 baud packets. That's why I need so many...
de WB4APR, Bob
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Subject: aprs1
From: "Darrell Sutton" <dsutton@visi.net>
Date: Thu, 23 Oct 2003 22:45:51 -0400
X-Message-Number: 27
Who sends the APRS-1 messages telling users to get registered. I am running
winaprs reg. for years and this progam tells me I need to register..
----------------------------------------------------------------------
Subject: Re: OpenTracker
From: Adi Linden <adil@adis.on.ca>
Date: Thu, 23 Oct 2003 22:45:10 -0500 (CDT)
X-Message-Number: 28
>A couple more items... first, the current draft of the schematic is at
>http://www.opentrac.org/opentracker-schematic.png. Second, I'd like to
What processor is on there?
Adi
--
Adi Linden | va3adi | va3adi@adis.ca | http://adis.ca
+-----------------------------------------------------------------+
IRLP Node 2590 in Sioux Lookout, Ontario
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