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PA2AGA > HDDIG 01.10.00 19:03l 224 Lines 7595 Bytes #-8629 (0) @ EU
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Subj: HamDigitalDigest 2000/264B
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To : HDDIG@EU
Date: Thu, 28 Sep 00 22:09:46 MET
Message-Id: <hd_2000_264B>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
------------------------------
Date: 27 Sep 2000 01:55:26 GMT
From: XXXXrlubash@poco.mv.com (Richard Lubash)
Subject: APRS Transmission Interval Etiquette
Being new to APRS I would like not to make too many mistakes so I have
another question. I have been experimenting with street level tracking
using APRS+SA at my home qth and a TM-D700 in a vehicle. I live in
mountainous terrain and the path from the mobile ranges from excellent
on top of hills and mountains to nonexistent in low areas. In order to
get as much detail as possible I have been keeping the auto beacon
function on the D700 at 1 minute in rough terrain. My question is what
is an appropriate transmission interval that will allow me to get
decent tracking resolution but not waste bandwidth on the APRS system.
Is there any established protocol like 1 transmission every X minutes
or is it sort of a free form thing left up to the operator.
Thanks for the help on my previous question es 73
Richard / N1VXW
-------------------------------------------------
Richard Lubash
N1VXW
email XXXXrlubash@poco.mv.com
-------------------------------------------------
ATTENTION: To stop that pesky junk mail I have
put the prefix (XXXX) at the front of my email address. To reply
remove (XXXX)
------------------------------
Date: Wed, 27 Sep 2000 08:19:54 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: APRS Transmission Interval Etiquette
Richard Lubash <XXXXrlubash@poco.mv.com.> wrote:
>Being new to APRS I would like not to make too many mistakes so I have
>another question. I have been experimenting with street level tracking
>using APRS+SA at my home qth and a TM-D700 in a vehicle. I live in
>mountainous terrain and the path from the mobile ranges from excellent
>on top of hills and mountains to nonexistent in low areas. In order to
>get as much detail as possible I have been keeping the auto beacon
>function on the D700 at 1 minute in rough terrain. My question is what
>is an appropriate transmission interval that will allow me to get
>decent tracking resolution but not waste bandwidth on the APRS system.
>Is there any established protocol like 1 transmission every X minutes
>or is it sort of a free form thing left up to the operator.
A good system will adapt the rate of transmissions to the movement of the
vehicle. I.e. when the vehicle is moving slow it will transmit less
frequently than when it is moving fast. You can then set it to "transmit
every Y minutes or when the position has moved a distance more than Y
from the previously transmitted position".
It is also possible to listen to re-transmissions via a digipeater.
When it hears back re-transmissions of its own beacons it should transmit
less frequently than when it does not hear such re-transmissions.
Rob
--
+----------------------------------+--------------------------------------+
| Rob Janssen pe1chl@amsat.org | WWW: http://www.knoware.nl/users/rob |
| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+
------------------------------
Date: Tue, 26 Sep 2000 11:33:25 -0500
From: "KA9CAR John Dewey" <ka9car@xarrl.net>
Subject: modifying phone modem for use on HF
I once read an adendum in the back of a Hayes manual that gave the proper
command sequences to use the 1200 baud mode to send ascii on the air. It
even showed how to use the "on hook" relay to key the transmitter!
I am sure I threw it out ten years ago, but it was in the back of a hays
book for an external modem.
Good Luck!
KA9CAR
Jeffrey Krehbiel <jeffrey_krehbiel@hotmail.com> wrote in message
news:8qofm1$gu2$1@nnrp1.deja.com...
> I seem to remember seeing an article some time ago that talked about
> using phone modems on HF for RTTY, AMTOR, etc. I have not been able to
> find any information on the subject, and was hoping someone else had
> heard of this and could point me in the right direction. I have a
> couple of Hayes 2400 modems that can be set for the old Bell 300 / 1200
> baud modes, and am in the mood to experiment :) Thanks!
>
> 73 de Jeff KM5KH
>
> --
> Jeffrey N. Krehbiel <jeffrey_krehbiel@hotmail.com>
> KM5KH Tulsa Oklahoma
>
> --
> Jeffrey N. Krehbiel <jeffrey_krehbiel@hotmail.com>
> PGP Key Fingerprint EA6F 2233 7BB1 A4F7 10D3 30E0 5447 0DC9 C82C 926A
>
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
------------------------------
Date: Tue, 26 Sep 2000 18:32:11 -0500
From: "Charles Brabham" <n5pvl@swb.net>
Subject: Packet Experimentors Society of Texas
General Interest articles (Packet Radio related) with a "text version"
button for newsletter editors, plus a special section on FlexNet, recognized
globally as one of the best sources of setup info for the most advanced
Packet networking system.
http://home.swbell.net/n5pvl/
Enjoy!
73 DE Charles Brabham, N5PVL
------------------------------
Date: Tue, 26 Sep 2000 17:58:48 -0000
From: "Carlos Poinho CU3FT" <cu3ft@qsl.net>
Subject: satelites
where can i find some programs to work satelites????
carlos poinho cu3ft
------------------------------
Date: 26 Sep 2000 15:50:49 GMT
From: nielsen@oz.net (Bob Nielsen)
Subject: TEKK (was Re: UHF APRS frequency?)
Does anyone have recommendations for crystal suppliers for TEKK
radios?
Bob, N7XY
On Tue, 26 Sep 2000 07:00:42 -0700, Dana H. Myers K6JQ wrote:
>horseshoestew@my-deja.com wrote:
>
>> By the way, we've standardized on frequencies around 439.000 in SoCal.
>> I think there were 438.950, 438.975, 439.000, 439.025, 439.050. If you
>> were getting a TEKK radio crystal cut - 439.025 was your best bet.
>
>I was on 439.025 for a long time with a Flexar; just couldn't hear too
>much activity out in the boonies - in fact, I think I can enumerate every
>station that ever regularly emitted a 9k6 peep out in the Antelope Valley
>on one hand, and we were all on 439.025.
>
>The TEKK radios are neat enough for a metropolitan area context but
>were not particularly effective over the relatively long distances we had
>to deak with. Land mobiles were really required.
>
>Dana K6JQ
>dana@source.net
>
>
--
Bob Nielsen, N7XY nielsen@oz.net
Bainbridge Island, WA http://www.oz.net/~nielsen
------------------------------
Date: Tue, 26 Sep 2000 07:00:42 -0700
From: "Dana H. Myers K6JQ" <k6jq@pacbell.net>
Subject: UHF APRS frequency?
horseshoestew@my-deja.com wrote:
> By the way, we've standardized on frequencies around 439.000 in SoCal.
> I think there were 438.950, 438.975, 439.000, 439.025, 439.050. If you
> were getting a TEKK radio crystal cut - 439.025 was your best bet.
I was on 439.025 for a long time with a Flexar; just couldn't hear too
much activity out in the boonies - in fact, I think I can enumerate every
station that ever regularly emitted a 9k6 peep out in the Antelope Valley
on one hand, and we were all on 439.025.
The TEKK radios are neat enough for a metropolitan area context but
were not particularly effective over the relatively long distances we had
to deak with. Land mobiles were really required.
Dana K6JQ
dana@source.net
------------------------------
End of Ham-Digital Digest V2000 #264
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