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ZL3AI > APRDIG 28.01.07 14:15l 96 Lines 3329 Bytes #999 (0) @ WW
BID : 9639-ZL3AI
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Subj: [APRSSIG] Vol 31 #31, 4/4
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<F5GOV<F4BWT<IW2OAZ<ZL2BAU
Sent: 070128/0611Z @:ZL2BAU.#79.NZL.OC #:29593 [Waimate] $:9639-ZL3AI
From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Message: 28
Date: Fri, 26 Jan 2007 09:30:28 -0800 (PST)
From: Alex Carver <agcme2002_at_yahoo.com>
Subject: [aprssig] RE: Stuck KPC3+ serial port?
Well, I tried the standard hard reset, removing the battery, the KISS break
command, and checked the cables again and this thing still won't talk to
me.
I did email Kantronics but they haven't replied yet (and I don't even know
if they will). Still open to any more ideas.
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Message: 29
Date: Fri, 26 Jan 2007 12:48:24 -0500
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: [aprssig] DIGIpeater - Network performance
No one jumped on this sentence buried in some of the earlier emails...
>1) I live in probably the highest density of APRS and voice
>repeaters on the planet, over 100 voice repeaters and I just
>checked 50 digipeaters heard on RF....
I was frying other fish at the time, but when I noticed this 50 digipeaters
heard on RF in the Baltimore-Washington DC area, it did tweak my interest.
Today, I got back to it and took a detail look at this.
Turns out, all but 5 of those digis are using the proper 2 hop paths and
are fully compliant with the New-N paradigm. Only 1 was so far out of area
as to be due to TROPO. The others all represent how powerful a 2 hop path
is on the Eastern Seaboard. Now remember, that a 2 HOP path from a
digipeater is similar to a 3 hop path from a user station, since the digi
is already at a high site, so we will see digipeaters one tier beyond where
we should be seeing 2 hop users. These two images show the digis and how
many are outside of my ALOHA circle.
http://www.ew.usna.edu/~bruninga/aprs/DC-digis.GIF
But since 2 hop users are one tier less than 2 hop digi's, most of the 240
users I hear on RF these days are within my ALOHA circle as we hoped:
http://www.ew.usna.edu/~bruninga/aprs/DC-users.GIF
Anyway, this is a lot better picture than it used to be, and even with all
that activity, there is still some quiet time for most mobiles to get in.
Those areas that are still stuck with RELAY and WIDE digiepeaters can look
forward to improvements such as we have gained here.
See http://www.ew.usna.edu/~bruninga/aprs/fix14439.html
Bob, WB4APR
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Message: 30
Date: Fri, 26 Jan 2007 09:50:29 -0800
From: Ben Jackson <ben_at_ben.com>
Subject: Re: [aprssig] PIC and telemetry question
On Fri, Jan 26, 2007 at 08:53:27AM -0500, Robert Bruninga wrote:
>>How do you get a register that may be say 234 in value, to be
>>sent as ASCII as "2" "3" and "4"
>>
>>Do you process by 100, 10 and 1's ?
>
>Yes, divide by 100, keep remainder, divide by 10, and keep
>remainder...
>Bob
No, on a PIC you count how many times you subtract 100 to get below 100,
then how many 10 to get below 10 and then the remainder is the last digit.
Or, as someone else said, you never store or generate it as '234', you keep
it in BCD (packed if necessary). The PIC has some features to help with
packed BCD. Look at piclist.com
If the answer on a PIC is ever "divide", you asked the wrong question!
--
Ben Jackson AD7GD
http://www.ben.com/
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End of aprssig Digest, Vol 31, Issue 31
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