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[aprssig] CNSP-18 via ISS can work (FREQ MAP)

Steve Daniels steve at daniels270.eclipse.co.uk
Wed Dec 5 13:29:14 UTC 2012


You can have it in a different format png is a standard format though.
If we assume that you want to be received by a ground based station, it
could be done the other way around and mark areas not in range.

Steve Daniels
Amateur Radio Callsign G6UIM
Torbay Freecycle  Owner
http://uk.groups.yahoo.com/group/torbay_freecycle
APRSISCE/32 Beta tester and WIKI editor http://aprsisce.wikidot.com
 

-----Original Message-----
From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
Of Robert Bruninga
Sent: 05 December 2012 04:49
To: TAPR APRS Mailing List
Subject: Re: [aprssig] CNSP-18 via ISS can work (FREQ MAP)

> Great use of the map, will update it, unless you can
> send me the full size map and save me the effort.

I could not seem to save the format you used, so best I could do was a
screen capture and then hand draw the LAT/LONG lines by eyeball using
PAINT..

Painting all the oceans a color and marking them with 145.825 is one
method, but assumes zero range to shoreside digis.  DOing a 10 mile
off-shore line would be for small boats, 15 miles for ships, 100 miles
for aircraft, or 400 miles for balloons... so  you see deciding twhere
to draw the boundaries is problematic.

Maybe bet not to draw any special oclean area, but just put the text
145.825 in the middle of each of the big oceans?

Bob, Wb4aPR
>
> Steve Daniels
> Amateur Radio Callsign G6UIM
> Torbay Freecycle  Owner
> http://uk.groups.yahoo.com/group/torbay_freecycle
> APRSISCE/32 Beta tester and WIKI editor http://aprsisce.wikidot.com
>
>
> -----Original Message-----
> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
> Of Robert Bruninga
> Sent: 05 December 2012 00:54
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] CNSP-18 via ISS can work (FREQ MAP)
>
> I overlayed a sketch of three 145.825 LAT/LONG boxes on G6UIM's APRS Freq
> Map that could shift FREQS over the Atlantic with 3 IF-THEN lines for the
> three freqs 144.39, 145.825, and then 144.800.
>
> See: http://aprs.org/transatlantic-freqs.GIF
>
> Bob, Wb4APR
>
> -----Original Message-----
> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
> Of Steve Daniels
> Sent: Tuesday, December 04, 2012 6:41 PM
> To: 'TAPR APRS Mailing List'
> Subject: Re: [aprssig] CNSP-18 via ISS can work
>
> The idea proposed is to switch frequency based on Longitude, set two
> longitudes, if you are West of both transmit on 144.390, west of one and
> east of the other transmit on 145.825, east of both transmit on 144.800.
> Easily implemented, cycling through the frequencies "wastes" two thirds of
> the beacons, when you are using low mass kit and have limited battery life
> you really need every beacon to hopefully be received. As you are
> attempting
> to gate through people who don't know you exist, and even asking people
> who
> do know to constantly sit at the radio changing frequency is a bit much.
>
> When using the ISS you hopefully hit a satgate, and the ISS of course, but
> with a reasonable beacon rate you stand a chance, which is better than
> nothing at all. And of course with the footprint of the ISS can can more
> easily organise a few stations to monitor.
> Transalantic flights take a few hours so you would hopefully get some
> packets through and received on a pass of the ISS that's also within range
> of the USA or Europe.
>
> At least one designer is hoping to implement a scheme
>
>
> Steve Daniels
> Amateur Radio Callsign G6UIM
> Torbay Freecycle  Owner
> http://uk.groups.yahoo.com/group/torbay_freecycle
> APRSISCE/32 Beta tester and WIKI editor http://aprsisce.wikidot.com
>
>
> -----Original Message-----
> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
> Of Robert Bruninga
> Sent: 04 December 2012 23:02
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] CNSP-18 via ISS can work
>
>> I can't think of any way to have the [ISS]radio capture
>> the Balloon's packets reliably since there would be so
>> much traffic...
>
> No, the only time the ISS is needed is away from land and there is no
> other traffic out there.  Also, the ISS digi already supports WIDEn-N
> digipeating as it is, so it would work as long as the radio was switched
> to 144.39 or whatever freq the balloon was on.
>
> But then the coordination to get the ISS crew to do such a simple thing at
> exactly the right pass over the middle of the atlantc, would take a
> month's planning.... IE, practically impossible.
>
> The easy fix is to have trans-atlantic balloons ALTERNATE between
> 144.39/(144.80) and 145.825 on every other packet just for this case.
> Then no one has to do anything, but monitor the ISS when it passes over
> the Atlantic.
>
> Bob, Wb4APR
>
> --- John Ronan  wrote:
>
>> Afternoon,
>>
>> Silly question,
>>
>> Would there be any possibility to get the ISS to listen for
>> trans-atlantic balloons, even if just to verify if they are
>> still transmitting?
>>
>> Cheers
>> John
>> EI7IG
>
>
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