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CX2SA > SATDIG 17.05.09 00:03l 809 Lines 27974 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: Satpc32 with 2 Transceivers (Bill Dzurilla)
2. uni_trac keps (Gerry)
3. How do you do that? (Jerry Felts)
4. Rig Ttracking (Howard Kowall)
5. Re: Dayton demos (Andrew Glasbrenner)
6. Atlantis and Hubble Photo (Clint BRADFORD)
7. Re: Tracking Friends at Dayton.. (Bob Bruninga )
8. Re: Dayton demos (Patrick STODDARD (WD9EWK/VA7EWK))
9. Re: Atlantis and Hubble Photo (GW1FKY@xxx.xxxx
10. Re: Tracking Friends at Dayton.. (Nate Duehr)
11. Gain VS Bandwidth at 2.4GHZ (Luc Leblanc)
12. Bad link (Luc Leblanc)
13. Re: Satpc32 with 2 Transceivers (Bill Dzurilla)
14. Re: Gain VS Bandwidth at 2.4GHZ (Stan W1LE)
15. Re: Tracking Friends at Dayton.. (Bob Bruninga )
16. Re: Gain VS Bandwidth at 2.4GHZ (Greg D.)
----------------------------------------------------------------------
Message: 1
Date: Fri, 15 May 2009 13:22:23 -0700 (PDT)
From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
Subject: [amsat-bb] Re: Satpc32 with 2 Transceivers
To: amsat-bb@xxxxx.xxx
Message-ID: <520672.20876.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Howard,
With Erich's kind help, I was able to get SatPC32 working last week with 2
transceivers.
I had a similar problem with the SSB sats at first. I could not hear my
downlink while the program was controlling the frequencies on the 2 rigs. It
turned out that the issue was that the default settings for some of the birds
was off (either because my rigs are off calibration or because the frequency
on the sat's transponder drifted since Erich wrote Doppler.SQF).
The fix is not difficult. With the program controlling the rigs, and with the
satellite near to its maximum elevation on a pass, tune to a clear downlink
frequency and click CAT on the program. Then start transmitting (say testing,
testing, count to 10, anything) while clicking on the up and down arrows under
"Upl. Calibr. (Hz)". When you hear your voice on the downlink in a natural
sounding tone, click "Change/Store Data File" and then click save, which
automatically changes the Doppler.SQF file. Once set correctly for each bird,
your uplink and downlink will track perfectly.
I couldn't get it right at first because I kept clicking on the 10 hz arrows.
This was insufficient, as some of the sats were over 500 hz off. But it was
easy after I started clicking the 100 hz arrows.
You can also manually review and edit the Doppler.SQF file by clicking ? and
then Auxiliary Files, but this should not be necessary.
73, Bill NZ5N
Date: Fri, 15 May 2009 11:22:53 -0500
From: "Howard Kowall" <hkowall@xxxx.xx>
Subject: [amsat-bb] Satpc32 with 2 Transceivers
To: "AMSAT-BB@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <000a01c9d579$65dbc2f0$6701a8c0@xxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Good morning everyone
Trying to run Satpc32 with a FT897d and FT817nd
The ft897nd is on the uhf antenna and the ft817nd is on the vhf antenna
it all seems to work on the FM sats but having some problems with ssb sats
AO7,VO52,FO29
The trouble I am having is on the calibration of the freq. and doppler
adjument
has anyone run into this
hopefully someone has a few pointers and tricks
Thanks to all who reply
Howard
VE4ISP
------------------------------
Message: 2
Date: Fri, 15 May 2009 16:01:08 -0500
From: "Gerry" <ve4gtb@xxx.xxx>
Subject: [amsat-bb] uni_trac keps
To: <amsat-bb@xxxxx.xxx>
Message-ID: <0B43CA99E5D2466BA4AD1B9BC5BC435F@xxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hope someone can help.Have been wintering in Arizona for past five months
and upon my return cannot seem to find a set of keps that will work, my old
system cleaning out the + and - etc now fails me . Have I missed something,
has there been a change??
73
Gerry VE4GTB/KD7MDB
------------------------------
Message: 3
Date: Fri, 15 May 2009 15:18:24 -0600
From: Jerry Felts <nr5ajerry@xxxxx.xxx>
Subject: [amsat-bb] How do you do that?
To: amsat-bb@xxxxx.xxx
Message-ID:
<21baf9ff0905151418s3dc707daxeb8efecba7ac8067@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Reading Howard's post about gtting his rig to follow each other. I use
a FT-857D for the uplink TX, and my FT-817 for the downlink. Wondering
how you get them to follow ech other? That would sure be easier than
what I do now. I'm a newbie and I'm having mixed results. For the FM
birds I just use my FT-60R and Elk antenna.
--
Jerry - NR5A - South Dakota
www.freewebs.com/nr5a
http://nr5abikeblog.blogspot.com/
http://nr5abeaconblog.blogspot.com/
------------------------------
Message: 4
Date: Fri, 15 May 2009 16:27:09 -0500
From: "Howard Kowall" <hkowall@xxxx.xx>
Subject: [amsat-bb] Rig Ttracking
To: "AMSAT-BB@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <001f01c9d5a3$e783f460$6701a8c0@xxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
I just might see if I can make a pic module to go from one transceiver to the
other
and would be able to be programmed to be able to send cat info back and fourth
to each transceiver
so it would be able to track the Doppler offset,and just with a selector
switch pick your programed sat and one rig would follow the other
Howard
VE4ISP
------------------------------
Message: 5
Date: Fri, 15 May 2009 18:19:22 -0400
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Dayton demos
To: <amsat-bb@xxxxx.xxx>
Message-ID: <BBB7788D036A418196C3AF3CF1A0EF21@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
I picked up one of the 100 that Alinco released this morning. I'll put
together a review as soon as I get home.
73, Drew KO4MA
> Hello Drew,
>
> Any word on the Alinco HT that will do full duplex 2M/70cm ??
>
------------------------------
Message: 6
Date: Fri, 15 May 2009 18:13:18 -0700
From: Clint BRADFORD <clintbradford@xxx.xxx>
Subject: [amsat-bb] Atlantis and Hubble Photo
To: amsat-bb@xxxxx.xxx
Message-ID: <A3C03B60-8E47-415B-AD6E-A893402B5283@xxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
An incredible shot of Atlantis and Hubble - with the Sun as their
backdrop ...
http://www.astrosurf.com/legault/atlantis_hst_transit.html
------------------------------
Message: 7
Date: Sat, 16 May 2009 00:07:21 -0400 (EDT)
From: "Bob Bruninga " <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: Tracking Friends at Dayton..
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>, ns1z@xxx.xx.xxxx
nate@xxxxxxxx.xxxxxxxxxxxxx@xxxxx.xxx
Message-ID: <20090516000721.AJT70236@xxx.xxxxxxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
>>>> This year you can use your DTMF HT to
>>>> report where you are hanging out at
>>>> the Hamvention to about 120 feet just
>>>> by sending two digits for your XY coordinate.
Well, maybe Dayton was not the best place to introduce this "special event"
capability <grin>... Even at the 0.25 mile scale, of the 290+ stations heard,
at least 190 of them were all within the square city block of the Hamvention
fences. That-is, Wall to wall stations on the map so cluttered you couldnt
find anyone unless you used a search function to find their call on the map! .
So position reporting was not the best application.
In this case the best application was not sending POSITION, but would be
sending FREQUENCY. This way, you dont need to know where they were (or find
them on the map), but just look at their data and CALL them by voice.
Again, APRS was not designed for "tracking", but just as a national data
channel for exchanging valuable information in the surrounding area.
Exchanging operating frequency is just as important in Ham radio as position
in many cases.
We can kill this thread here on the AMSAT-bb, now, since everyone either found
each other at the AMSAT booth or excellent banquet!
Thanks
Bob, WB4APR
------------------------------
Message: 8
Date: Fri, 15 May 2009 21:22:16 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] Re: Dayton demos
To: amsat-bb@xxxxx.xxx
Message-ID:
<2e18ad3e0905152122l1ba6e70ep219ff63fa6f3f323@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
> I picked up one of the 100 that Alinco released this morning. I'll put
> together a review as soon as I get home.
I picked up one as well, early in the morning. Need to see if any of
the Alinco dealers have accessories for it. Nice little radio, and it
is a cross-band full-duplex (for 2m/70cm - did not test with 1.2 GHz)
HT as advertised. Tuning steps as small as 5 kHz on all bands
means that - with a suitable antenna, and probably an amplifier - it
could be made to work on AO-51's L-band FM uplink. Dayton price
is $299, much better than I had expected. In Japan, Alinco's MSRP
is at 57000 yen (about US$ 600), so I thought it would be closer to
$400 even here at Dayton.
Without accessories, I disabled the full-duplex capability as not to
cause feedback on one AO-27 pass I tried with it this afternoon. I
stood on the Indiana/Ohio state line, down the street from my motel
(west of Dayton, near I-70), and tried it with an Elk log periodic.
Separate knobs for volume and VFO on each band are just like the
IC-W32A. The receiver may not be as sensitive as the IC-W32A,
or it seemed like that this afternoon. I'll play with it more, to get a
better idea of how it stacks up against other radios I've used.
I already received one comment via e-mail after that AO-27 pass
this afternoon related to the new HT. It mentioned that my audio
was low and sounded compressed. The HT has a mic gain menu
setting from 1 to 4 - 1 is "quiet", 4 is "loud" per the manual. Out
of the box, it was at 3. It has already been moved up to 4, ready
for the next time I get on the birds with it.
73!
Patrick WD9EWK/VA7EWK - currently in Richmond IN
http://www.wd9ewk.net/
------------------------------
Message: 9
Date: Sat, 16 May 2009 04:21:59 EDT
From: GW1FKY@xxx.xxx
Subject: [amsat-bb] Re: Atlantis and Hubble Photo
To: clintbradford@xxx.xxxx amsat-bb@xxxxx.xxx
Message-ID: <bc8.4d996805.373fd1a7@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
Hi Clint,
Thanks for another of your very interesting pointers on space topics.
I think that many will also find another web site mentioned on the page
shown will find it a very useful
and interesting tool.
_www.calsky.com_ (http://www.calsky.com) will give you all sorts of
information on space related objects including pass times of amateur
satellites
for your location.
Registration is not essential but will of course prove useful for news and
perhaps other essentials.
Enjoy this site, and as is common practice, do not forget to enter your own
location or co-ordinates
to get such a large amount of useful and valuable information.
Ken Eaton
GW1FKY
Amsat -UK
Amsat NA
------------------------------
Message: 10
Date: Sat, 16 May 2009 05:03:44 -0600
From: "Nate Duehr" <nate@xxxxxxxx.xxx>
Subject: [amsat-bb] Re: Tracking Friends at Dayton..
To: "Bob Bruninga " <bruninga@xxxx.xxx>, "Greg D."
<ko6th_greg@xxxxxxx.xxx>, ns1z@xxx.xx.xxxx amsat-bb@xxxxx.xxx
Message-ID: <1242471824.21432.1315755453@xxxxxxx.xxxxxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="ISO-8859-1"
On Sat, 16 May 2009 00:07:21 -0400 (EDT), "Bob Bruninga "
> In this case the best application was not sending POSITION, but would be
> sending FREQUENCY. This way, you dont need to know where they were (or
> find them on the map), but just look at their data and CALL them by
> voice.
Bob,
I know I picked on the first posting about the location tracking
earlier, so I feel compelled to give my first impression of this -- and
my first thought was: "THAT'S COOL!"
Finding what FREQUENCY someone is on is something that's amazingly
empowering to Amateurs attempting to make contacts of any sort.
So far, the hobby has been stunted in this regard -- we have what? The
hunt and pounce/spin the dial... we have dedicated frequency
infrastructure either via the technology or via "agreements" (like 'this
HF Net meets here'), and we have DX Cluster/Spotting type networks, and
that's about it... and even on those, it's somewhat "improper" for
cultural reasons to "self-spot"...
So a mechanism to tell others, "Hey I'm at a radio and I'm listening to
X frequency"... is WAY cool.
Sorry to tie up AMSAT-BB one more time with a reply -- but maybe to TRY
to keep it on-topic I'd say, "Imagine if people could say in real
time... XXX, YYY, and ZZZ are all listening to this bird because they've
sent a notification that they are, and if they're able to hear me,
they'll respond!"
It won't replace the wonder and amazement of a "raw" CQ call that gets
answered by a new Amateur voice halfway around the world, and the
contesting world would be in an uproar about that "self-spotting" if
anyone used it to help others find them during an operating "skills"
event... but for day-to-day "get 'er done" types of contacts, it's
really got some interesting potential. "I'm in the car, and I'm
listening to X" info, when you've been trying to catch up with an old
friend on the air, etc... would be invaluable.
Nate WY0X
--
Nate Duehr
nate@xxxxxxxx.xxx
------------------------------
Message: 11
Date: Sat, 16 May 2009 03:01:58 -0400
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] Gain VS Bandwidth at 2.4GHZ
To: amsat-bb@xxxxx.xxx
Message-ID: <4A0E2CA6.25408.3FA5EF1@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=US-ASCII
For those who are using WiFi 802,G beam on S band
I just found that my Pacific Wireless WIMAX VA 25 -16 antenna for 2.4GHZ has a
bandwidth starting at 2.5ghz to 2.7ghz (www.pacwireless.com)
Even if at theses frequencies things are a bit larger i'm guessing the 16db
gain figures are surely not standing at 2.4ghz. Did any one
have a ball game figures of what remains at 2.4ghz? I have no way to measure
SWR at this frequency and this is surely not optimal?
Conclusion don't jump too fast on some hamfest deal as what's good for WiFI is
not always so good at 2.4ghz!
P.S. I can use the antenna on 2.4ghz and i got fairly good signal from AO-51
when he's in S mode but i cannot get rid out of the fades.
Could be i found why?
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 12
Date: Sat, 16 May 2009 03:10:50 -0400
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] Bad link
To: amsat-bb@xxxxx.xxx
Message-ID: <4A0E2EBA.17350.4027E59@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=US-ASCII
Sorry
Bad link on my previous message copy paste this one instead.
http://r-
onetrading.com/index.php?page=shop.product_details&product_id=281&category_id=
70&option=com_virtuemart&Itemid=1#Pacific%20Wireless%20VA24-
16
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 13
Date: Sat, 16 May 2009 07:37:51 -0700 (PDT)
From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
Subject: [amsat-bb] Re: Satpc32 with 2 Transceivers
To: amsat-bb@xxxxx.xxx
Message-ID: <460503.75831.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
For the benefit of anyone who may experience a similar problem in the future,
Erich, Howard, and I had a discussion of this issue via private email. The
method I described in my prior post apparently does not work with Yaesu rigs,
because they do not allow variation of the transmit frequency while
transmitting. So Yaesu owners should do the following, per Erich, the author
of SatPC32:
"While the satellite, say FO-29, is in range for you choose that satellite
and open menu "CAT". Transmit and whistle or say "Test" etc. With the
"Downl. Corr." controls tune the RX radio until you hear your own signal
with the correct audio pitch. Then stop transmitting. You will see the
correction value in the "Downl. Corr." window. For certain reasons this
correction can't be stored automatically, however. Therefore with the
"Upl.Calibr." controls set the same correction value, but in the opposite
direction. If, i.e., you corrected the downlink by +1450 Hz correct the
uplink by -1450 Hz. Click on "Change/Store Data File" and save the uplink
calibration. In the frequency list of menu CAT you will see that only the
uplink entry changes.
When you restart the program it will start with the calibrated uplink
frequency and no downlink correction."
--- On Fri, 5/15/09, Bill Dzurilla <billdz.geo@xxxxx.xxx> wrote:
> From: Bill Dzurilla <billdz.geo@xxxxx.xxx>
> Subject: Re: Satpc32 with 2 Transceivers
> To: amsat-bb@xxxxx.xxx
> Date: Friday, May 15, 2009, 4:22 PM
> Howard,
>
> With Erich's kind help, I was able to get SatPC32 working
> last week with 2 transceivers.
>
> I had a similar problem with the SSB sats at first.? I
> could not hear my downlink while the program was controlling
> the frequencies on the 2 rigs.? It turned out that the
> issue was that the default settings for some of the birds
> was off (either because my rigs are off calibration or
> because the frequency on the sat's transponder drifted since
> Erich wrote Doppler.SQF).
>
> The fix is not difficult.? With the program
> controlling the rigs, and with the satellite near to its
> maximum elevation on a pass, tune to a clear downlink
> frequency and click CAT on the program.? Then start
> transmitting (say testing, testing, count to 10, anything)
> while clicking on the up and down arrows under "Upl. Calibr.
> (Hz)".? When you hear your voice on the downlink in a
> natural sounding tone, click "Change/Store Data File" and
> then click save, which automatically changes the Doppler.SQF
> file.? Once set correctly for each bird, your uplink
> and downlink will track perfectly.
>
> I couldn't get it right at first because I kept clicking on
> the 10 hz arrows.? This was insufficient, as some of
> the sats were over 500 hz off.? But it was easy after I
> started clicking the 100 hz arrows.?
>
> You can also manually review and edit the Doppler.SQF file
> by clicking ? and then Auxiliary Files, but this should not
> be necessary.
>
> 73, Bill NZ5N???
>
> Date: Fri, 15 May 2009 11:22:53 -0500
> From: "Howard Kowall" <hkowall@xxxx.xx>
> Subject: [amsat-bb]? Satpc32 with 2 Transceivers
> To: "AMSAT-BB@xxxxx.xxxx
> <amsat-bb@xxxxx.xxx>
> Message-ID:
> <000a01c9d579$65dbc2f0$6701a8c0@xxxxxxxxx>
> Content-Type: text/plain;? ?
> charset="iso-8859-1"
>
> Good morning everyone
> Trying to run Satpc32 with a FT897d and FT817nd
> The ft897nd is on the uhf antenna and the ft817nd is on the
> vhf antenna
> it all seems to work on the FM sats but having some
> problems with ssb sats AO7,VO52,FO29
> The trouble I am having is on the calibration of the freq.
> and doppler adjument
> has anyone run into this
> hopefully someone has a few pointers and tricks
> Thanks to all who reply
> Howard
> VE4ISP
>
>
> ? ? ?
>
------------------------------
Message: 14
Date: Sat, 16 May 2009 11:16:36 -0400
From: Stan W1LE <stanw1le@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
To: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4A0ED8D4.4000104@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello Luc,
Like any other fleamarket/hamfest/ebay item, you do not know what you have
till you get it home and and evaluated on the test bench. Bid
accordingly.....
The feed is probably a simple dipole. Take the plastic housing apart and
tune the dipole (shorten/lengthen) to where you want it.
Or, get another feed for the freqs needed.
The manufacturer may offer different freq response feeds for their same
dish.
My first gridded dish I tuned up for 2304 MHz and it performed well
afterwards.
The gridded dish on the satellite tower came with a decent VSWR at 2400 MHz.
The fades in reception of 2.4 GHz satellites are due to using a linear
polarization
and NOT a circular polarization. Try a circularly polarized feed.
Or try a H AND a V linearly polarized antenna system,
select in the shack which one to listen to.
Stan,W1LE Cape Cod FN41sr
Luc Leblanc wrote:
> For those who are using WiFi 802,G beam on S band
>
> I just found that my Pacific Wireless WIMAX VA 25 -16 antenna for 2.4GHZ has
a bandwidth starting at 2.5ghz to 2.7ghz (www.pacwireless.com)
> Even if at theses frequencies things are a bit larger i'm guessing the 16db
gain figures are surely not standing at 2.4ghz. Did any one
> have a ball game figures of what remains at 2.4ghz? I have no way to measure
SWR at this frequency and this is surely not optimal?
>
> Conclusion don't jump too fast on some hamfest deal as what's good for WiFI
is not always so good at 2.4ghz!
>
> P.S. I can use the antenna on 2.4ghz and i got fairly good signal from AO-51
when he's in S mode but i cannot get rid out of the fades.
> Could be i found why?
>
>
> "-"
>
>
> Luc Leblanc VE2DWE
> Skype VE2DWE
> www.qsl.net/ve2dwe
> WAC BASIC CW PHONE SATELLITE
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
------------------------------
Message: 15
Date: Sat, 16 May 2009 14:24:59 -0400 (EDT)
From: "Bob Bruninga " <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: Tracking Friends at Dayton..
To: Nate Duehr <nate@xxxxxxxx.xxx>, "Greg D."
<ko6th_greg@xxxxxxx.xxx>, ns1z@xxx.xx.xxxx amsat-bb@xxxxx.xxx
Message-ID: <20090516142459.AJT73665@xxx.xxxxxxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
>> In this case the best application was not sending
>> POSITION, but would be sending FREQUENCY.
>> This way, you dont need to know where they were
>>(or find them on the map), but just look at their
>> data and CALL them by voice.
> my first thought was: "THAT'S COOL!"
> Finding what FREQUENCY someone is on is something
> that's amazingly empowering to Amateurs attempting
> to make contacts of any sort.
Yes, And it is amazing that we did not realize that back when we invented
APRS. But we did add it later and after the Katrina Hurricane, we formalized
CONTACT frequency as a formal part of the APRS spec. So now as you drive down
the road, people can not only see where you are, but what freq you are
monitoring. That was the main enhancement to the new Kenwood APRS radio, the
D710, to include your voice freq in every position packet. Automatically, and
in real time, since it knows what freq the other side of the radio is tuned
to.
And as a companion to that, when the D710 sees someone's freq in their packet,
it can tune the radio there with th e press of a single button (TUNE). Thus
facilitating voice contact.
With APRStt, we hope to bring that capability to everyone with a DTMF key pad.
With just two buttons, they can alert the world where they are and what freq
they are monitoring.
One button calls up their CALLSIGN from DTMF memory, and the other button
calls up their favorite FREQ from another memory.
Another AMSAT application for APRStt in the local area is to have something
like "AO51" programmed into a DTMF memory. Then when you happen to hear AO51
in view, you just press two buttons on the APRStt channel, one for your call,
the other for the AO51 text, and then every mobile in the area can see on
their mobile display "AO51" and know it is in view right then, right there.
Even since 1998 or so, there have been automatic progrms that put out
satellite-in-view alerts to the front panels of APRS radios to show not only
the locatoin of the moving satellite, but also, its range, bearing, and
frequency AND doppler! The kenwood can even SPEAK these alerts to the driver
who is not concentrating on his APRS display.
So, APRS was never a tracking system, it was a single common INFO channel to
distribute local information of immediate interest in the local area. There
are as many applications as there are ham radio applications. Its not about
ttracking. Its about one-to-all-local distribution of info of immediate
interest.
Thanks
Bob, WB4APR
>
>So far, the hobby has been stunted in this regard -- we have what? The
>hunt and pounce/spin the dial... we have dedicated frequency
>infrastructure either via the technology or via "agreements" (like 'this
>HF Net meets here'), and we have DX Cluster/Spotting type networks, and
>that's about it... and even on those, it's somewhat "improper" for
>cultural reasons to "self-spot"...
>
>So a mechanism to tell others, "Hey I'm at a radio and I'm listening to
>X frequency"... is WAY cool.
>
>Sorry to tie up AMSAT-BB one more time with a reply -- but maybe to TRY
>to keep it on-topic I'd say, "Imagine if people could say in real
>time... XXX, YYY, and ZZZ are all listening to this bird because they've
>sent a notification that they are, and if they're able to hear me,
>they'll respond!"
>
>It won't replace the wonder and amazement of a "raw" CQ call that gets
>answered by a new Amateur voice halfway around the world, and the
>contesting world would be in an uproar about that "self-spotting" if
>anyone used it to help others find them during an operating "skills"
>event... but for day-to-day "get 'er done" types of contacts, it's
>really got some interesting potential. "I'm in the car, and I'm
>listening to X" info, when you've been trying to catch up with an old
>friend on the air, etc... would be invaluable.
>
>Nate WY0X
>--
> Nate Duehr
> nate@xxxxxxxx.xxx
>
------------------------------
Message: 16
Date: Sat, 16 May 2009 11:33:18 -0700
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
To: <lucleblanc6@xxxxxxxxx.xx>, <amsat-bb@xxxxx.xxx>
Message-ID: <BLU133-W24ABEBE06DCEEF07352AB2A95C0@xxx.xxx>
Content-Type: text/plain; charset="Windows-1252"
Hi Luc,
>
> Conclusion don't jump too fast on some hamfest deal as what's good for WiFI
is not always so good at 2.4ghz!
>
This was probably just a typo; if so, pardon the reply...
Wi-Fi and Wi-Max are different things. An antenna designed for Wi-Max
may not operate very well, as you describe, on 2.4 ghz. Wi-Fi's
802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation),
so a properly designed Wi-Fi antenna could be good for 13cm Ham
applications.
>
> P.S. I can use the antenna on 2.4ghz and i got fairly
good signal from AO-51 when he's in S mode but i cannot get rid out of
the fades.
> Could be i found why?
>
Pretty much every Wi-Fi antenna I've ever seen is linearly polarized. The
"diversity" antennas are two separate antennas, usually one vertical and one
horizontal, with separate cables going to two radios. Going circular would
seem to be a no-brain improvement for the Wi-Fi crowd, but I think I've only
seen one vendor do it.
Enjoy the new toy,
Greg KO6TH
_________________________________________________________________
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------------------------------
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End of AMSAT-BB Digest, Vol 4, Issue 226
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