[aprssig] Ham radio, Advertise!
bruninga at usna.edu
Mon Oct 29 15:19:23 CDT 2007
> Ya...Andy, WA3PBD rebroadcasts the shuttle audio
> in the Pittsburgh Area. Great idea for a new APRS
> object! I'm already putting out a repeater object
> - is it possible to do two?
Don't want the ISSrtx object transmitted except when there is
mission audio... This should be possible by setting a spare TNC
for say 5 minute beacons (local only) and then connecting the
external-carrier-detect to the voice re-transmitter.
Whenever the ISS audio transmitter keys, then it removes the
external carrier detect, and the TNC sends out the ISSrtx beacon
every 5 minutes while it remains active. Then shuts down all
the rest of the time.
This makes it real-time, just like APRS is supposed to be. Not
a bunch of stale beacons about non-changing things... Neat. I
think there are a lot of places that sometimes retransmit the
audio, though most of us don't know where or when.
This kind of capability should be easy to implement with a spare
TNC and low power transmitter. A really slick trick could set
the ISS-AUDIO-RETX transceiver for SPLIT mode with TX on the ISS
re-trans frequency and RX on 144.39. Then by just closing the
"REV" button contacts, this same transmitter could TX the packet
on 144.39 and then drop the REV button and then transmit the ISS
audio on its TX freq. A little circuit should be able to do
> On 10/29/07, Robert Bruninga <bruninga at usna.edu> wrote:
> During the 5 hour drive back from the AMSAT conference
> Western PA I was bored and scanning to find something to
> my mobile rig. After a long time, finally found a very
> on 145.62 just east of New Stanton.
> As signals got stronger, it sounded more like pirates...
> work crew working on some maintenance prject. This was
> bunch of pirates on ham radio in an unused portion of
> I was running APRS and GPS and was getting excited
> about turning
> this into a short DF mission (using signal strength
> was getting a clearly increasing signal..
> Then I thought. Hummh... I've heard that sound
> Sounds like scuba divers. You can hear them breathing..
> Duh. Was space station crew out on an EVA! I was
> re-broadcast of the ISS audio, complements of a local
> the wilderness of western PA.
> Which gets me to the topic of this post.
> It pays to advertise! If something is going on in HAM
> put out a LIVE APRS beacon on-air. Let people see it.
> supposed to be the single clearing house of where to
> this information live in real time)...
> A simple once-every-10-minute local-direct APRS beacon
> inform everyone live in the vicinity of that
> it is on the air now... Live... This is needed whether
> strangers passing through, or locals on their way to get
> who forgot that today was EVA day.
> Live advertising of real-time happenings on APRS is a
> all of ham radio. APRS was never intended as an end in
> It was supposed to be the catch-all information
> resource for the
> local area. A mobile seeing one of these beacons can
> alterted and participate in the event... In the new
> D710, he can even QSY with the press of one button if
> also contains the frequency.
> APRS is TWO-WAY. Everything in ham radio should be
> LIVE local direct on APRS for the benefit of local
> Here is how I would advertise Space Station Audio on
> 1) Give it the object NAME of "ISSrtx-xx"
> 2) Give it an approximate position
> 3) Include the local RE-TX frequency in the comment
> This APRS object will flash on the front panel of the
> D700 or HAMHUD as ISSrtx... and not just some other
> The position information causes the radio to display the
> direction, and distance to the transmitter for the
> the mobile. The frequency info shows him where to tune.
> the freq is in the right format, then the new Kenwood
> auto-tune to it. You can put this object in ANY local
TNC as a
> BEACON TEXT. Here is how:
> BT ;ISSrtx-xx*111111zDDMM.hhN/DDDMM.hhWE 145.620MHz
> Station audio.
> UNPROTO APRS (direct)
> BEACON 10 minutes
> Notice I added "xx" (I'd use "wP" in this case for
> to fill out the 9 byte object name field so that when
> picked up by the global APRS system, then this object
> unique from any other similar site. To see if your
> choice is already in use, just check FINDU.COM:
> And you will see everyone else's object choices, so you
> choose two unique "xx" characters for your system too.
> Hook this TNC and spare 144.39 Transmitter to the same
> the system controlling the ISS audio. This way, it is
> automatic. If this system is re-transmitting space
> audio, then the APRS advertising beacon will be on the
> Since this stuff is quite rare, I might even suggest
> automatied beacon go out once every 5 minutes, so that
> out for a short trip won't miss it. Remember, it is a
> simplex direct packet from a high location that can hear
> local users, so therefore it will avoid any collisions
> impact local channel load.
> Many of us can only find time to play HAM radio while
> So, please advertise. Let us know what is happening
> your area. There certainly are enough old TNC's out
> nothing else that could be put into such use.....
> Oh, and if you need a BEACON in a pinch, you can use
your D7 or
> D700 to generate the object. Here's how:
> Please do NOT beacon any such object farther than it can
> used. This is important, because out of area,
> 1) It is QRM to anyone beyond its range
> 2) If it was digipeated, it has double the collision
> 3) The Txing station if digipeated cannnot hear a clear
> Bob, WB4APR
> aprssig mailing list
> aprssig at lists.tapr.org <mailto:aprssig at lists.tapr.org>
> Charles L. Mills
> Email: w3yni1 at gmail.com
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