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ZL3AI > APRDIG 12.04.07 07:04l 235 Lines 8606 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 34 #9, 3/6
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Message: 14
Date: Mon, 9 Apr 2007 15:55:57 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: RE: [aprssig] Telemetry format
>The existing format could be condensed to:
>
>a1122334455d00
>compare to
>111,222,333,444,555,bbbbbbbb
Actually, when you put the 36 bytes of the typical 2 hop header in front of
it, plus say 10 sync bytes and 4 bytes of serial number, the packet length
is then actually a comparison between 64 versus 78 which is only a savings
of about 18%
But I do agree that we do need an expandable telemetry set. What about:
T#SSSS,112233445566778899... To the end for any number of 8 bit hex pairs
T#SSSS;111222333444555666777888999AAABBB... To the end for any number of up
to 12 bit values.
The serial number is human readable. The comma implies 2 byte 8 bit HEX
values. The Semicolon implies 3 byte 12 bit HEX values... Making the
serial number be 4 bytes avoids any match to the existing T#SSS, format.
Using that delimiter as an indicator of the byte count can be extended to
single byte and to 4 or more bytes or BCD or whathave we...
WB4APR, Bob
------------------------------
Message: 15
Date: Mon, 9 Apr 2007 16:03:52 -0500
From: "John Habbinga" <kc5zrq_at_gmail.com>
Subject: Re: [aprssig] SSID for RF only Station with backup power
This week I'll be installing a larger battery backup system at my
Digipeater/Internet Gateway/Telpac Gateway site. It's not really designed
to power the system for an extended period. It has two 12V 95Ah batteries,
but it will be powering a computer, two radios and the wireless network
sytem. My guess is that it will run for an hour or so before losing power.
In that time period, if we decide the station is important enough, then we
have a small gasoline generator we can carry to the site.
In the scenario above, would my station use the same APRS symbol that you
are proposing?
------------------------------
Message: 16
Date: Mon, 09 Apr 2007 17:09:53 -0400
From: "Richard Amirault" <ramirault_at_verizon.net>
Subject: Re: [aprssig] SSID for RF only Station with backup power
----- Original Message -----
From: "Bill Vodall WA7NWP" >
(snip)
>Given that, I think it would be interesting to pull up on the map (via
>Internet or whatever) the other "APRS Emergency Op Stations" either
>locally or nationally thus the question about a unique symbol or SSID.
Personally I don't think those stations need anything special.. they will
be the ones that show up on your screen as still active under those
circumstances.
Richard Amirault, Boston, MA, USA
http://n1jdu.org
http://n1jdu.org/Fandom/science.htm
------------------------------
Message: 17
Date: Mon, 09 Apr 2007 14:16:34 -0700
From: "Stephen H. Smith" <wa8lmf2_at_aol.com>
Subject: Re: [aprssig] SSID for RF only Station with backup power
kc5zrq_at_gmail.com wrote:
>This week I'll be installing a larger battery backup system at my
>Digipeater/Internet Gateway/Telpac Gateway site. It's not really
>designed to power the system for an extended period. It has two 12V
>95Ah batteries, but it will be powering a computer, two radios and the
>wireless network sytem. My guess is that it will run for an hour or
>so before losing power. In that time period, if we decide the station
>is important enough, then we have a small gasoline generator we can
>carry to the site.
190 Ah can only power this for an hour?? What are you using -- vacuum
tube radios?? Take a look at my ham server at:
I am powering a PC, two TNCs, and three transceivers (a TS-50, a VHF
monobander and a UHF monobander), a Linksys router and a cable modem on a
total of 7.5 AMPs at 12.6 VDC. The computer's monitor is a Samsung 192MP
19" flat panel with a built-in TV tuner that also runs directly from 12VDC.
Normally it is off, but when turned on it only adds about 1.5A to the
drain.
With you battery setup and only 50% discharging the batteries, my setup
would run for at least half a day or more.
------------------------------
Message: 18
Date: Mon, 9 Apr 2007 16:18:06 -0500
From: "John Habbinga" <kc5zrq_at_gmail.com>
Subject: Re: [aprssig] SSID for RF only Station with backup power
>Personally I don't think those stations need anything special.. they will
>be the ones that show up on your screen as still active under those
>circumstances.
This is true. I recall that there was one working digipeater in New
Orleans that was on the air through out the Katrina aftermath. However, I
never saw anyone using it.
------------------------------
Message: 19
Date: Mon, 9 Apr 2007 16:34:04 -0500
From: "John Habbinga" <kc5zrq_at_gmail.com>
Subject: Re: [aprssig] SSID for RF only Station with backup power
I'm sure that it will run longer, but I'm not making any guarantees to my
local ham community that it will run longer. I don't know the exact
specifications on the Wireless network equipment that I'll be connecting to
it. I think there are five dishes (transceivers) associated with it. As
to how much current that will draw, I just don't know. My hope is that it
will run long enough to decide if we want to continue using it, and then
connect the generator.
------------------------------
Message: 20
Date: Mon, 09 Apr 2007 14:33:35 -0700
From: "Stephen H. Smith" <wa8lmf2_at_aol.com>
Subject: Re: [aprssig] SSID for RF only Station with backup power
kc5zrq_at_gmail.com wrote:
>>Personally I don't think those stations need anything special.. they
>>will be the ones that show up on your screen as still active under
>>those circumstances.
>
>This is true. I recall that there was one working digipeater in New
>Orleans that was on the air through out the Katrina aftermath.
>However, I never saw anyone using it.
Probably because all the home and mobile clients were underwater......
------------------------------
Message: 21
Date: Mon, 9 Apr 2007 16:38:20 -0500
From: "John Habbinga" <kc5zrq_at_gmail.com>
Subject: Re: [aprssig] SSID for RF only Station with backup power
>Probably because all the home and mobile clients were underwater......
Yes, but I was hoping that some of the rescue and relief crews going into
the area would make use of it. It seems to me that if you had a fleet of
boats throughout the city plucking people off of rooftops, APRS would be a
benefit to the people coordinating those efforts.
------------------------------
Message: 22
Date: Mon, 9 Apr 2007 18:17:26 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: RE: [aprssig] SSID for RF only Station with backup power
>>Given that, I think it would be interesting to pull
>>up on the map... the other "APRS Emergency Op Stations"
>>... thus the question about a unique symbol or SSID.
>
>Personally I don't think those stations need anything
>special... they will be the ones that show up on your
>screen as still active under those circumstances.
True, but its better to not wait until the emergency happens to find out
who is prepared for an emergency...
It is true, that we cannot account for every possible combination of
emergency power and station type, I think it is worthwhile to have an
alternative energy designation. I was going to look for one in the table,
but we are just running out...
So I propose the following:
* Being there are less than 7 APRS symbols left
* Being that there are many many more ideas to go
* Therefore, APRS must expand its symbol set by using OVERLAYS
* We need concurrence from all authors on receipt of an overlay:
- Receipt on all existing "overlyable characters works"
- Receipt on any other symbol will not break anything
- Eventually receipt of the overlay may be displayed somehow
- An overlay on a base symbol can trigger a different symbol
I will post this proposal to the APRS1.2 addendum page:
http://www.ew.usna.edu/~bruninga/aprs/aprs12.html
Bob, WB4APR
------------------------------
Message: 23
Date: Mon, 09 Apr 2007 17:42:29 -0500
From: "Robbie, wa9inf" <mwrobertson_at_comcast.net>
Subject: [aprssig] Internet to APRS email
Hi,
The subject came up by a couple of friends as to the possibility of
revisiting the capability of APRS traveler's friends reaching them via an
email, directed to a special moderated clearing address...
This was in place several years ago, with a few moderators, my being one of
them, but it suddenly disappeared, the plug was pulled..
I would be willing to volunteer again to be one of the moderators if this
isn't against some rules and someone can see a way to reactivate it.
I can see some great benefits, as well as some pitfalls...
Robbie
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