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ZL3AI > APRDIG 11.01.04 05:42l 137 Lines 5327 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Jan 06, 3/3
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: RE: Any way to limit range of rcvd stations using internet
From: Jeff King <jeff@aerodata.net>
Date: Tue, 6 Jan 2004 21:58:07 -0500
X-Message-Number: 23
So, the answer is Yes? Sounds like it to me.
--
Jeff King, jeff@aerodata.net on 01/06/2004
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Subject: RE: Any way to limit range of rcvd stations using internet
From: "AE5PL Lists" <HamLists@ametx.com>
Date: Tue, 6 Jan 2004 21:15:14 -0600
X-Message-Number: 24
I would say the two perform different functions. AFilter provides
logging and filtering in both directions. javAPRSFilter reduces the
bandwidth used between the server and client and it reduces client
overhead by filtering the APRS-IS stream going to the client. While, in
my estimate, 95% of the day-to-day filtering needed by most hams can be
accomplished with server-side filtering, there are still instances where
client-side filtering can do certain things, such as logging, that can't
be done on the server.
Mark gave a good description of one of the key differences between
AFilter and javAPRSFilter, but there are other differences as well as
stated above.
73,
Pete Loveall AE5PL
pete@ae5pl.net
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Subject: Re: World-wide APRS frequencies/coverage
From: "John Langtry, VE3NEC" <ve3nec@sympatico.ca>
Date: Tue, 06 Jan 2004 21:33:17 -0500
X-Message-Number: 25
Bonjour Robert,
The frequency of 144.390 was first "standardized" in Canada; largely though
the efforts of Pierre VA3PM (Director & FSM of the Radio Amateurs of
Canada), many years ago now.
There was a large debate (somewhat heated I might add), when it was decided
to QSY. (pro's and con's were hotly contested, and the e-mails that flew
back and forth, became "unseemly").
I personally credit Jeff KA9VNV's really nice approach. He very quitely,
made a web-site http://dididahdahdidit.com/ to show how each State &
Province were making out with the "QSY". No comments, only colours (very
nice touch, Jeff).
So now it became the "challenge" to QSY our gear, and see it appear on
Jeff's web site. (No arguments, just a change of colour on a map for all to
see.) This is subtile and masterly logic; Congratters again, Jeff.
However, Robert, what you see on Jeff's web-site are for Cananda and the
United States only. As you have seen from other e-mails, this frequency is
either not available, or all ready in use, elsewhere in the World. But
Europe are trying to get to the same place that we are, but with much
difficulty, as they're governments are much more restrictive than would be
found in North America. (Bands vary from Region to Region).
Perhaps, some day, (yeah right) when Jeff has time, he will expand his
efforts from just North America to the World.
The snag here is that both Jeff (in the U.S.) and I (in Canada) have more
than *full time* jobs (that pay the bills, and put food on the table) and
only a small amount of time to devote to our hobby.
I hope, that in part, this answers your questions; I don't have the *final*
answer ! :)
Mes salutation et vy 73 de John VE3NEC
905-873-8715
----------------------------------------------------------------------
Subject: RE: Any way to limit range of rcvd stations using internet
From: "Bill Diaz" <william.diaz@comcast.net>
Date: Tue, 6 Jan 2004 22:51:46 -0600
X-Message-Number: 26
Jeff,
AFilter is much more than an APRS IS filter. It provides the user the
ability to filter the APRS IS via an extensive GUI and to log desired
packets to disk.
The logging capability is used often used for specialized purposes such as
weather logging and analysis, telemetry logging etc.
You can set up multiple GeoFiltered areas to limit the feed to those
geographical areas of interest. You can pass satellite packets or an
unlimited number of specified stations from outside your GeoFiltered areas.
Very easy to pass and log NWS-Warnings, Watches, Advisories, for specific
NWS stations and /w/w/a types. You can pass and log all wx station packets,
or just those in your GeoFiltered areas.
AFilter is bi-directional. It can optionally filter and log outgoing as
well as incoming packets. You can create APRS Objects, Ping APRS stations
and ping IP addresses with AFilter. It has a built in Chat program that
works with AChat servers.
I don't think that you can compare AFilter with the Java filtered ports
since it provides a full GUI, extensive logging capabilities and other
features that are simply not possible to obtain from a full or filtered
server.
When used in conjunction with AFilterX, it can also serve the filtered data
to multiple clients. This capability allows users to set up specialized
servers such as SatGates, Wx only servers, etc. The AFilter / AFilterX
installation requires a total of about 2.5MB of HD space. It is compiled,
not interpreted code, and was designed to work with Win98 and above.
BTW, the very first Citizens Weather server used AFilter and AFilterX to
accept CW station weather and pass it to the APRS IS.
ALogger provides capabilities similar to AFilter, but was designed solely
for logging purposes.
AFilter, AFilterX and ALogger can be downloaded from http://www.wa6oft.com
Bill KC9XG
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