Station in any heard list

[Angelo - IW0QHA]

Hello,

IU0CPY-1 is no listed in any "Stations heard directly by ..." on the information station page of digi, but it is present on the map !!

Someone can give me an explanation ??

73 - Angelo - IW0QHA

[Heikki Hannikainen]

Hi,

On Sat, 26 Nov 2016, Angelo - IW0QHA wrote:

> IU0CPY-1 is no listed in any "Stations heard directly by ..." on the information station page of digi, but it is present on the map !!
> Someone can give me an explanation ??

It is transmitting with a WIDE2-1 path, so aprs.fi can't tell whether it
was heard directly or whether it went through a digipeater first.

http://aprs.fi/?c=raw&call=IU0CPY-1+&limit=50&view=normal

This has been discussed many times on the group, please search for 'heard
wide2-1' for example:

https://groups.google.com/forum/#!searchin/aprsfi/heard$20list$20WIDE2-1%7Csort:relevance/aprsfi/3ReR-DpiDwo/38y7xh32MGMJ

- Hessu

[Una Smith]

APRS weather stations and iGates may be silent, that is report data to the internet but not transmit. Any APRS station may transmit yet not be received by any other stations.

I looked up IU0CPY-1 just now and there is a 6-minute old good path from it to IR0AAC-10. Also, it says it is some kind of OpenTracker, which is a low power transmitter.

Una Smith KE5CEP

[Heikki Hannikainen]

On Sat, 26 Nov 2016, Una Smith wrote:

> APRS weather stations and iGates may be silent, that is report data to
> the internet but not transmit. Any APRS station may transmit yet not be
> received by any other stations.
>
> I looked up IU0CPY-1 just now and there is a 6-minute old good path from
> it to IR0AAC-10. Also, it says it is some kind of OpenTracker, which is
> a low power transmitter.

Sorry, but I don't think this answer has anything to do with the original
question below. As Angelo said, it shows up on the map fine, it's just not
showing up on the "Stations heard directly by ..." list on the info page.
Which is due to the WIDE2-1 path.

> On Sat, Nov 26, 2016 at 05:19:39AM -0800, Angelo - IW0QHA wrote:
>> Hello,
>> IU0CPY-1 is no listed in any "Stations heard directly by ..." on the
>> information station page of digi, but it is present on the map !!
>> Someone can give me an explanation ??
>>
>> 73 - Angelo - IW0QHA

- Hessu

[Angelo - IW0QHA]

Thank you so much for your reply ... I read the tread that you specified, and I honestly do not know this "rule."

I have already written to the communities' local amateur radio to adopt only WIDE1-1 or WIDE2-2.

TNX

73 - Angelo - IW0QHA

[Matthew Pitts]

Hessu, I suspect a lot of people don't understand the technical aspects of APRS, so they don't comprehend the impact that how a station is set up can have on the display.

Matthew Pitts
N8OHU

[Heikki Hannikainen]

On Sat, 26 Nov 2016, Angelo - IW0QHA wrote:

> Thank you so much for your reply ... I read the tread that you specified, and I honestly do not know this "rule."
> I have already written to the communities' local amateur radio to adopt only WIDE1-1 or WIDE2-2.

Hi,

The "heard" statistics are not perfect, and can not be made perfect, as
APRS was not designed with these kinds of statistics in mind.

As written in the linked thread, WIDE2-1 makes a lot of sense in some
situations, and whether or not the "heard" statistics work then, may not
be really important all.

[Heikki Hannikainen]

On Sat, 26 Nov 2016, Matthew Pitts wrote:

> Hessu, I suspect a lot of people don't understand the technical aspects of APRS, so they don't comprehend the impact that how a station is set up can have on the
> display.

Right. But, I guess, if someone posts an incorrect answer which may
confuse whoever posted the original question, it might be better to say it
out aloud that the answer is not quite right.

> On Nov 26, 2016 11:36 AM, "Heikki Hannikainen" <he...@hes.iki.fi> wrote:
> On Sat, 26 Nov 2016, Una Smith wrote:
>
> APRS weather stations and iGates may be silent, that is report data to the internet but not transmit.  Any APRS station may transmit yet not be
> received by any other stations.
>
> I looked up IU0CPY-1 just now and there is a 6-minute old good path from it to IR0AAC-10.  Also, it says it is some kind of OpenTracker, which is
> a low power transmitter.
>
>
> Sorry, but I don't think this answer has anything to do with the original question below. As Angelo said, it shows up on the map fine, it's just not showing up on
> the "Stations heard directly by ..." list on the info page. Which is due to the WIDE2-1 path.
>
> On Sat, Nov 26, 2016 at 05:19:39AM -0800, Angelo - IW0QHA wrote:
> Hello,
> IU0CPY-1 is no listed in any "Stations heard directly by ..." on the
> information station page of digi, but it is present on the map !!
> Someone can give me an explanation ??
>
> 73 - Angelo - IW0QHA
>
>
>   - Hessu
>
>

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>

- Hessu

[Lynn W Deffenbaugh (Mr)]

The bottom line is this: If you want to know what stations your IGate
is receiving, look at your local IGate logs. Nothing you see via the
APRS-IS (including aprs.fi) will tell you the details about how your
station is operating.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

[Una Smith]

If someone posts an incorrect answer, then I think it is more helpful
to say not only that the answer is incorrect, but how and why.

Be that as it may...

I answered as I did because to me the original poster's question was
ambiguous. It asked how a station can be "not heard directly" yet be
"present on the map" and offered as one example a particular station.
I read it as a general question, not a specific question about that
particular station.

The phrasing of the question puzzled me and it seemed to me that some
unstated questions may be lurking in the background, that are specific
to this station. In the list of raw packets from IU0CPY-1 [1] why is
the relay station APOT30 not a link? Why does the IU0CPY-1 info page
[2] not list APOT30 as hearing IU0CPY-1 directly?

There is a raw packets page for APOT30 [3]:

2016-11-23 00:41:22 MST: APOT30>APOT30,K7SOB-13*,K3ARL-5*,WIDE2*,CLAYTN*,WIDE1*,WIDE1-2,qAR,W3OI:T#00 [Unsupported packet format]
2016-11-26 05:53:28 MST: APOT30>APOT30,9M4RDG-3*,9W2VHF-3*,9W2EW*,qAS,9W2WHT-1:`m@to^nj/]"4S}TRAVEL [Invalid characters in mic-e packet]

[1] http://aprs.fi/?c=raw&call=IU0CPY-1
[2] http://aprs.fi/info/a/IU0CPY-1
[3] http://aprs.fi/?c=raw&call=APOT30

Una Smith, KE5CEP