Discussion:
Recommended Message Packet Length (PacLen) through satellites?
Alan
2014-09-01 18:59:33 UTC
Permalink
I have seen some of Bob's discussions WRT to terrestrial use, and the various HTs which many people use. Is there a different recommend maximum Packet Length for communicating via the various packet satellites? Some TNCs and emulators, as well as programs such as UISS, have options for this.

73s,

Alan
WA4SCA
Lynn W. Deffenbaugh (Mr)
2014-09-01 19:10:58 UTC
Permalink
Shorter is always better when it comes to APRS packets. And when doing
APRS satellites, shorter gives you a much better chance to get through.
"Hi" has a better chance than "Hello" which is still better than
"Greetings fellow Earthing...".

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
Post by Alan
I have seen some of Bob's discussions WRT to terrestrial use, and the various HTs which many people use. Is there a different recommend maximum Packet Length for communicating via the various packet satellites? Some TNCs and emulators, as well as programs such as UISS, have options for this.
73s,
Alan
WA4SCA
_______________________________________________
aprssig mailing list
http://www.tapr.org/mailman/listinfo/aprssig
Steve
2014-09-01 22:19:03 UTC
Permalink
As Lynn says the shorter the better. Use compressed for the location part.
A lot of people are trying to use the same channel at the same time, when a
pass happens. So shorter packets give everyone a better chance.

If you see someone trying to use the Mailbox you may just as well give up.
Generally the entire pass is taken up with connect retries, it being
connected mode rather then unconnected.

Steve G6UIM

-----Original Message-----
From: aprssig-bounces-***@public.gmane.org [mailto:aprssig-bounces-***@public.gmane.org] On Behalf
Of Lynn W. Deffenbaugh (Mr)
Sent: 01 September 2014 20:11
To: TAPR APRS Mailing List
Subject: Re: [aprssig] Recommended Message Packet Length (PacLen) through
satellites?

Shorter is always better when it comes to APRS packets. And when doing
APRS satellites, shorter gives you a much better chance to get through.
"Hi" has a better chance than "Hello" which is still better than
"Greetings fellow Earthing...".

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
Post by Alan
I have seen some of Bob's discussions WRT to terrestrial use, and the
various HTs which many people use. Is there a different recommend maximum
Packet Length for communicating via the various packet satellites? Some
TNCs and emulators, as well as programs such as UISS, have options for this.
Post by Alan
73s,
Alan
WA4SCA
_______________________________________________
aprssig mailing list
http://www.tapr.org/mailman/listinfo/aprssig
Steve
2014-09-01 22:32:46 UTC
Permalink
I started a VHF world map of APRS Frequencies a while ago, and it took a
fair bit of time to get as far as I did. It's not complete as it's difficult
to find and get a response from various clubs around the world. If you know
the frequency please let me know
Loading Image...

steve
G6UIM
Robert Bruninga
2014-09-01 23:34:41 UTC
Permalink
And I maintain a copy of Steve's map on the main APRS.org page, but with
the actual frequenceis labeled on the map for easier reading.

aprs.org
Post by Steve
I started a VHF world map of APRS Frequencies a while ago, and it took a
fair bit of time to get as far as I did. It's not complete as it's difficult
to find and get a response from various clubs around the world. If you know
the frequency please let me know
http://aprsisce.wdfiles.com/local--files/doc:frequencies/APRSVHFworldmap.png
steve
G6UIM
_______________________________________________
aprssig mailing list
http://www.tapr.org/mailman/listinfo/aprssig
John Gleichweit
2014-09-04 17:41:19 UTC
Permalink
Why doesn't it surprise me in the least that APRS is forbidden in Yemen and North Korea?
Post by Steve
I started a VHF world map of APRS Frequencies a while ago, and it took a
fair bit of time to get as far as I did. It's not complete as it's difficult
to find and get a response from various clubs around the world. If you know
the frequency please let me know
http://aprsisce.wdfiles.com/local--files/doc:frequencies/APRSVHFworldmap.png
steve
G6UIM
_______________________________________________
aprssig mailing list
http://www.tapr.org/mailman/listinfo/aprssig
Steve
2014-09-04 18:04:09 UTC
Permalink
Well amateur Radio as a whole is forbidden, not just APRS. I just put APRS
as it was an APRS map.



Steve

G6UIM



_____

From: aprssig-bounces-***@public.gmane.org [mailto:aprssig-bounces-***@public.gmane.org] On Behalf
Of John Gleichweit
Sent: 04 September 2014 18:41
To: TAPR APRS Mailing List
Subject: Re: [aprssig] APRS VHF World Map



Why doesn't it surprise me in the least that APRS is forbidden in Yemen and
North Korea?



On Monday, September 1, 2014 3:32 PM, Steve <steve-fxvOwWI06ENIuCIm0BRNBpz/***@public.gmane.org>
wrote:



I started a VHF world map of APRS Frequencies a while ago, and it took a
fair bit of time to get as far as I did. It's not complete as it's difficult
to find and get a response from various clubs around the world. If you know
the frequency please let me know
http://aprsisce.wdfiles.com/local--files/doc:frequencies/APRSVHFworldmap.png

steve
G6UIM

Alan
2014-09-01 23:38:56 UTC
Permalink
All true of course. I was wondering if there were any quantitative recommendations.

73s,

Alan
WA4SCA


<-----Original Message-----
<From: aprssig-bounces-***@public.gmane.org [mailto:aprssig-bounces-***@public.gmane.org] On Behalf Of Steve
<Sent: Monday, September 01, 2014 5:19 PM
<To: 'TAPR APRS Mailing List'
<Subject: Re: [aprssig] Recommended Message Packet Length (PacLen) through satellites?
<
<As Lynn says the shorter the better. Use compressed for the location part.
<A lot of people are trying to use the same channel at the same time, when a
<pass happens. So shorter packets give everyone a better chance.
<
<If you see someone trying to use the Mailbox you may just as well give up.
<Generally the entire pass is taken up with connect retries, it being
<connected mode rather then unconnected.
<
<Steve G6UIM
<
<-----Original Message-----
<From: aprssig-bounces-***@public.gmane.org [mailto:aprssig-bounces-***@public.gmane.org] On Behalf
<Of Lynn W. Deffenbaugh (Mr)
<Sent: 01 September 2014 20:11
<To: TAPR APRS Mailing List
<Subject: Re: [aprssig] Recommended Message Packet Length (PacLen) through
<satellites?
<
<Shorter is always better when it comes to APRS packets. And when doing
<APRS satellites, shorter gives you a much better chance to get through.
<"Hi" has a better chance than "Hello" which is still better than
<"Greetings fellow Earthing...".
<
<Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
<
<
<On 9/1/2014 2:59 PM, Alan wrote:
<> I have seen some of Bob's discussions WRT to terrestrial use, and the
<various HTs which many people use. Is there a different recommend maximum
<Packet Length for communicating via the various packet satellites? Some
<TNCs and emulators, as well as programs such as UISS, have options for this.
<>
<> 73s,
<>
<> Alan
<> WA4SCA
<>
<>
<> _______________________________________________
<> aprssig mailing list
<> aprssig-***@public.gmane.org
<> http://www.tapr.org/mailman/listinfo/aprssig
<>
<
<_______________________________________________
<aprssig mailing list
<aprssig-***@public.gmane.org
<http://www.tapr.org/mailman/listinfo/aprssig
<
<_______________________________________________
<aprssig mailing list
<aprssig-***@public.gmane.org
<http://www.tapr.org/mailman/listinfo/aprssig
Kenneth Finnegan
2014-09-02 02:14:05 UTC
Permalink
Post by Alan
All true of course. I was wondering if there were any quantitative recommendations.
Short of any official documentation for a specific satellite, I'd
defer to APRS v1.0.1 chapter 14:

"The message text may be up to 67 characters long, and may contain any
printable ASCII characters except |, ~ or {."

--
Kenneth Finnegan, W6KWF
http://blog.thelifeofkenneth.com/
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