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CX2SA > SATDIG 29.06.10 21:13l 705 Lines 24957 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: HF Satellite Relay (Joe)
2. WD9EWK - 2010 Field Day (Patrick STODDARD (WD9EWK/VA7EWK))
3. Re: HF Satellite Relay (Greg D.)
4. AMSAT-UK Colloquium 31 Jul/1 Aug - Hotel booking deadline
(Jim List)
5. Re: Negai Reentred?? (Masahiro Arai)
6. Re: Pass prediction algorithm (Kai Gunter Brandt)
7. Re: HF Satellite Relay (i8cvs)
8. Re: Pass prediction algorithm (Robert Bruninga)
9. Re: HF Satellite Relay (Robert Bruninga)
----------------------------------------------------------------------
Message: 1
Date: Tue, 29 Jun 2010 00:24:29 -0500
From: Joe <nss@xxx.xxx>
Subject: [amsat-bb] Re: HF Satellite Relay
To: amsat-bb@xxxxx.xxx
Message-ID: <4C29838D.6020502@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Looks like freqs used were right around 2 gig and just above 2 meters
too. according to this book
http://books.google.com/books?id=_azf94TByF8C&pg=PA4&lpg=PA4&dq=frequencies+us
ed+in+project+echo&source=bl&ots=FmCl7J7Mix&sig=eUfFCrcaFQ4lz-5gBS7nt1JLBfg&hl
=en&ei=t4IpTOryEsL_nAfjp52MAQ&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCoQ
6AEwAw#v=onepage&q=frequencies%20used%20in%20project%20echo&f=false
Joe WB9SBD
Near Space Sciences
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 6/29/2010 12:03 AM, Greg D. wrote:
> Well, it's finally happened. We've come full circle. They've reinvented
Echo-1.
> http://en.wikipedia.org/wiki/Project_Echo
>
> Of course, that one was 10x larger. What makes this a 10m (band)
operation? I expect it would work on the higher bands too, especially with
the smaller size. What band did they use ~50-ish years ago?
>
> Greg KO6TH
>
>
>
>> From: bruninga@xxxx.xxx
>> To: amsat-bb@xxxxx.xxx
>>
> Cancel
>
>> Date: Mon, 28 Jun 2010 13:44:45 -0400
>> Subject: [amsat-bb] HF Satellite Relay
>>
>> Heard today of a Passive HF relay satellite being proposed.
>> Wondered if Hams could relay off of it.
>>
>> It's a 10m diameter sphere.
>> I assumed a 10m signal and 1000 Watts
>> And antenna gains at both ends of 10 dB.
>> Unless I made a dumb error, it looks impossible?
>> I get a received signal of -170 dBm
>> Compared to a good HF receiver of -122 dBm
>> So its 48 dB down in the noise.
>> Going to narrow band, could improve things, but the Doppler of
>> +/- 600 Hz would make that difficult.
>>
>> Anyway, if someone else wants to double check the link budget
>> using the radar range equation, go for it.
>>
>> The beauty of this system is that it is perfectly spherical, so
>> the reflection coefficient would be constant within 1 dB. That
>> is the advantage over trying to use the ISS or other large
>> rocket body... They vary by 20 dB making communication by
>> reflection impossible.
>>
>> Oh, and it would be in space for 30 years or more. So with
>> something that reliable, it would be worth developing an amateur
>> capability to use it.
>> It is not designed for comms, but as a calibration sphere for
>> over the horizon radars that have LOTS more power and LOTS more
>> gain than we do.
>>
>> Bob, Wb4APR
>>
>>
>> _______________________________________________
>> 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
>>
>
> _________________________________________________________________
> The New Busy is not the old busy. Search, chat and e-mail from your inbox.
>
http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL:
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> _______________________________________________
> 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: 2
Date: Mon, 28 Jun 2010 22:52:09 -0700 (PDT)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] WD9EWK - 2010 Field Day
To: amsat-bb@xxxxx.xxx
Message-ID: <688977.6679.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
Field Day was fun, even if my "contest" was only a Saturday event.
I did not stay out for the whole time, but enjoyed being in the
mountains in a forest playing radio. I also had a chance to make
some QSOs on HO-68 about an hour or so before the start of Field
Day. A good way to avoid the 111F/44C heat in my home city of
Phoenix.
On my way to my Field Day site, I stopped in Flagstaff AZ near the
I-17/I-40 junction to sneak in on an HO-68 pass at 1645 UTC. I
parked in a parking lot west of the junction and the Northern Arizona
University campus in grid DM45de, and made 7 QSOs before the satellite
was out of range. After that, I packed up my gear and finished my
driving to my Field Day spot.
I parked at the same place I used for Field Day last year, the Garland
Prairie Vista picnic ground in the Kaibab National Forest. This picnic
area is 20 miles/32km west of Flagstaff AZ, along old US-66 in grid
DM45ag. Along with last year's Field Day, I have worked from along the
road just west of here at the DM35xg/DM45ag grid boundary several times
in the past couple of years. I set up my station in the back of my
truck, catching some shade and enjoying the occasional breeze through
the forest. There have been some forest fires near this area, but those
were some distance away from me. I worked HF and 6m, along with the
satellites, enjoying the much cooler weather at this site. This year,
for the first time, I made some SSB satellite QSOs. :-)
I had a VO-52 pass right at the start of Field Day, 1800 UTC Saturday.
It was a shallow pass, and at that time the satellite was only up a
few degrees from the horizon to the southwest. No luck in completing
a QSO in the 4 or 5 minutes of the pass that started Field Day, but
I'd get a QSO on VO-52 later. Off to HF and - when I heard activity -
6m to log some QSOs before SO-50 and AO-27 passes to the west starting
at 2112 UTC.
I was able to make my SO-50 QSO with W0NT in Colorado before AO-27
started up. Then a quick QSO on AO-27 with "neighbor" WA2DFI in
another part of Arizona took care of my QSOs for 2 of the 3 FM birds.
A few stations called for me toward the end of the pass after I made
my QSO. I responded, so they could get their QSOs on AO-27. These
additional AO-27 QSOs were listed on my ARRL and AMSAT logs, but not
counted in the score for either event. I then went back to HF for an
hour, before an AO-7 pass at 2242 UTC. Lots of stations, but the 7-
degree pass at my location proved to be a barrier. No QSOs logged on
this pass, but I had 2 more AO-7 passes later. Back to HF and 6m...
Between 0018 UTC and 0110 UTC, I had passes on AO-51 followed by
AO-7 and FO-29. I was able to get Alvaro XE2AT on AO-51, something
on the order of a miracle with all the stations trying to get on
there. Then over to AO-7, which - once again - was as busy as 20m
SSB. Near the end of the pass, Rick VE4AMU was able to hear me
well enough to make a QSO. Then the fun really started on FO-29.
FO-29's pass to my east, starting at 0055 UTC, was what I hoped it
would be for my Field Day effort. During that 15-minute pass, I was
able to work 4 stations. It was easier for me to find my 5W signals
in the downlink, and hold it for the QSOs I made. I know there were
many more stations I did not work on that pass, but these QSOs got me
excited for more satellite passes an hour or so later.
Before the last group of satellite passes in the hour starting around
0222 UTC, I copied the W1AW Field Day bulletin on 17m SSB. After that,
I packed the HF/6m side of my station and got ready for 3 more passes -
AO-7 at 0222 UTC, then FO-29 at 0240 UTC, and VO-52 at 0308 UTC. The
first two passes were to my west, and VO-52 was on a pass to my east.
When AO-7 came up, I was able to quickly find myself in the downlink
and started calling CQ. Throughout the 20-minute pass, I made 5 QSOs!
The most-productive satellite pass I worked all day. As AO-7 was going
away, FO-29 was coming up. Despite hearing myself through the bird
and alternating between calling CQ and trying to answer other CQ calls,
I made no QSOs. Not a problem, since I had one more pass I wanted to
work as the sun was setting. VO-52 was loud, with many stations just
like I heard on the earlier AO-7 and FO-29 passes. Near the end of
the pass, WI9MRC in Wisconsin patiently asked for repeats in order to
complete our QSO. This was my only VO-52 QSO, but it was fun to slug
it out with my 5W radios trying to make that QSO happen.
When VO-52 went away, I turned on a couple of flashlights to help see
as I dismantled the satellite station and pack things in my truck for
the drive down I-40 to a truck stop for food and fuel, followed by
the 2-hour drive home.
For ARRL Field Day, I logged 49 QSOs on bands between 40m and 6m plus
the satellites. For AMSAT Field Day, 14 QSOs on 6 satellites - 6 on
AO-7, 4 on FO-29, and one each on the other 4 (AO-27, AO-51, SO-50,
VO-52). All done on battery power with a pair of 12V/20Ah jumpstart
battery packs, 5W transmitter power, without generators or running off
my truck's electrical system. No world records, but spending the day
in the mountains playing radio was a lot of fun. The SSB satellite
activity, in particular, was a great test of my skills in advance of
my trip to Canada next weekend.
I used an IC-703 HF/6m transceiver at 5W with an Outbacker Joey HF/VHF
vertical for my HF and 6m work, and my Elk Antennas handheld 2m/70cm
log periodic as my satellite antenna. I swapped between different
radios for the FM satellites (an IC-2820H 2m/70cm FM mobile radio,
throttled back to 5W) and SSB (two FT-817NDs, connected to the log
periodic through a diplexer). My ARRL web site soapbox entry for this
year's Field Day, along with some photos, can be seen at:
http://www.arrl.org/soapbox/view/7117
I've worked Field Day with my call as a 1B/1-op/Battery station every
year since 2001, and since 2006 on the satellites. My ARRL score won't
be as big as in 2009 with a slightly-lower QSO count, but being able to
log those SSB satellite QSOs meant I achieved the goal I set for myself
for this year's Field Day. And, as always, having fun at the same time.
Field Day is always a fun time for me, and I look forward to the 2011
event. Thanks to all the stations that made QSOs with WD9EWK, whether
on the satellites or on HF or 6m. 73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 3
Date: Mon, 28 Jun 2010 23:45:25 -0700
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: HF Satellite Relay
To: <amsat-bb@xxxxx.xxx>
Message-ID: <BLU133-W24273028CF4256873657C2A9CB0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hmmm, S-band is probably too noisy for the really weak return signal. It
might be physically too small for L-band, though that's a pretty quiet
place. Maybe something on C-band? C-C Rider on Balloon Bounce?
If this thing works, I wonder how big a balloon we can stuff into a Cubesat?
Greg KO6TH
> Date: Tue, 29 Jun 2010 00:24:29 -0500
> From: nss@xxx.xxx
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: HF Satellite Relay
>
> Looks like freqs used were right around 2 gig and just above 2 meters
> too. according to this book
>
http://books.google.com/books?id=_azf94TByF8C&pg=PA4&lpg=PA4&dq=frequencies+us
ed+in+project+echo&source=bl&ots=FmCl7J7Mix&sig=eUfFCrcaFQ4lz-5gBS7nt1JLBfg&hl
=en&ei=t4IpTOryEsL_nAfjp52MAQ&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCoQ
6AEwAw#v=onepage&q=frequencies%20used%20in%20project%20echo&f=false
>
> Joe WB9SBD
> Near Space Sciences
>
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
>
> On 6/29/2010 12:03 AM, Greg D. wrote:
> > Well, it's finally happened. We've come full circle. They've
reinvented Echo-1.
> > http://en.wikipedia.org/wiki/Project_Echo
> >
> > Of course, that one was 10x larger. What makes this a 10m (band)
operation? I expect it would work on the higher bands too, especially with
the smaller size. What band did they use ~50-ish years ago?
> >
> > Greg KO6TH
> >
> >
> >
> >> From: bruninga@xxxx.xxx
> >> To: amsat-bb@xxxxx.xxx
> >>
> > Cancel
> >
> >> Date: Mon, 28 Jun 2010 13:44:45 -0400
> >> Subject: [amsat-bb] HF Satellite Relay
> >>
> >> Heard today of a Passive HF relay satellite being proposed.
> >> Wondered if Hams could relay off of it.
> >>
> >> It's a 10m diameter sphere.
> >> I assumed a 10m signal and 1000 Watts
> >> And antenna gains at both ends of 10 dB.
> >> Unless I made a dumb error, it looks impossible?
> >> I get a received signal of -170 dBm
> >> Compared to a good HF receiver of -122 dBm
> >> So its 48 dB down in the noise.
> >> Going to narrow band, could improve things, but the Doppler of
> >> +/- 600 Hz would make that difficult.
> >>
> >> Anyway, if someone else wants to double check the link budget
> >> using the radar range equation, go for it.
> >>
> >> The beauty of this system is that it is perfectly spherical, so
> >> the reflection coefficient would be constant within 1 dB. That
> >> is the advantage over trying to use the ISS or other large
> >> rocket body... They vary by 20 dB making communication by
> >> reflection impossible.
> >>
> >> Oh, and it would be in space for 30 years or more. So with
> >> something that reliable, it would be worth developing an amateur
> >> capability to use it.
> >> It is not designed for comms, but as a calibration sphere for
> >> over the horizon radars that have LOTS more power and LOTS more
> >> gain than we do.
> >>
> >> Bob, Wb4APR
> >>
> >>
> >> _______________________________________________
> >> 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
> >>
> >
> > _________________________________________________________________
> > The New Busy is not the old busy. Search, chat and e-mail from your inbox.
> >
http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL:
en-US:WM_HMP:042010_3
> > _______________________________________________
> > 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
> >
> >
> >
> _______________________________________________
> 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
_________________________________________________________________
Hotmail has tools for the New Busy. Search, chat and e-mail from your inbox.
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en-US:WM_HMP:042010_1
------------------------------
Message: 4
Date: Tue, 29 Jun 2010 08:22:18 +0100
From: "Jim List" <jimlist@xxxxxx.xx.xxx>
Subject: [amsat-bb] AMSAT-UK Colloquium 31 Jul/1 Aug - Hotel booking
deadline
To: <amsat-bb@xxxxx.xxx>
Message-ID: <002701cb175b$ce9a90d0$6bcfb270$@xx.xxx>
Content-Type: text/plain; charset="US-ASCII"
Hi Folks,
I have just checked with the hotel, the Holiday Inn at Guildford, and they
have reminded me that they will release our dedicated rooms on 9 Jul. So
there isnt a great deal of time to be sure of a room.
Please contact Emily Morris in the Hotel's Business Centre on +44 (0) 1483
784437 emily.morris@xxx.xxx.
Further info, prices etc is at http://www.uk.amsat.org/content/view/32/42/
Last year there were still rooms available after the deadline, but one or
two delegates left it too late, and ended up in hotels in other parts of
Guildford.
SO PLEASE MAKE YOU BOOKING WITHIN THE NEXT WEEK TO BE SURE OF AVAILABILITY
73 Jim
G3WGM
Hon Sec AMSAT-UK
------------------------------
Message: 5
Date: Tue, 29 Jun 2010 21:31:37 +0900
From: Masahiro Arai <m-arai@x.xxxxx.xx.xx>
Subject: [amsat-bb] Re: Negai Reentred??
To: amsat-bb@xxxxx.xxx
Message-ID: <201006291231.AA00273@xxxxx.x.xxxxx.xx.xx>
Content-Type: text/plain; charset=iso-2022-jp
According to the Space Track, NEGAI reentered at 26th June.
As I reported before, Keps data shows the reentry day is around 21th
June.
Which is true, Keps data or Recent Satellite Decays on Space Track???
73
Masa JN1GKZ
>
>Here is the last two keps.
>
>#1
>NEGAI
>1 36575U 10020C 10169.93468623 .00761412 -54972-5 10000-3 0 301
>2 36575 029.9693 027.9688 0018320 250.4600 189.6837 16.33780746 4648
>
>Epoch: 10/06/18 22:25:57
>element set: 30
>perigee altitude: 173.2km
>
>
>#2
>NEGAI
>1 36575U 10020C 10172.70653775 .99999999 -60602-5 75369-3 0 299
>2 36575 029.9702 005.8364 0011956 035.9119 324.7358 16.63263503 5106
>
>Epoch: 10/06/21 16:57:25
>element set: 29
>perigee altitude: 99.7km
>
>
>Epoch is #1 < #2
>Element set is #1 > #2
>
>Which is the latest keps??
>
>
>73
>
>
>Masa JN1GKZ
>
>
>
>>
>>Japanese CubeSat Negai (object ID number:36575) reentered??
>>
>>The latest keps which is element set number 29, epoch 10172.70653775
>>shows Negai's perigee altitude is under 100km. There is no official
>>info (eg. Space Track) but I guess Negai already reenterd.
>>
>>Does anyone have reenter info??
>>
>>
>>73
>>
>>Masa JN1GKZ
------------------------------
Message: 6
Date: Tue, 29 Jun 2010 15:49:44 +0200
From: Kai Gunter Brandt <kai.brandt@xxx.xxx.xx>
Subject: [amsat-bb] Re: Pass prediction algorithm
To: amsat-bb@xxxxx.xxx
Message-ID: <4C29F9F8.2030405@xxx.xxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 06/28/2010 10:27 PM, Robert Bruninga wrote:
> And if it is like the original APRSdata.EXE, those are encoded
> with a leading % sign so that the D700 radio with a voice chip
> will actually SPEAK "HIGH" and "LOW" so you never even have to
> look at the radio.
>
>
Is there a list of those words for the TM-D700 ?
sending %HIGH to the TM-D710 is just spelling each letter :o/
Kai Gunter
LA3QMA
------------------------------
Message: 7
Date: Tue, 29 Jun 2010 20:05:41 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: HF Satellite Relay
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>, "Bob Bruninga"
<bruninga@xxxx.xxx>, "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <002d01cb17b5$b0262380$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Greg, KO6TH
Echo-1 A was a passive communication satellite launched on 12 august 1960
in a circular orbit at 1519 - 1687 km and it was a balloon 30.5 meters in
diameter made of 0.0127 mm thick metallized mylar polyester film to reflects
signals transmitted from the earth at 960 MHz and 2390 MHz
Echo-1 A was also carrying two VHF TLM beacons at 108.000 and 108.03 MHz
with a power of 45 mW and I was receiving both of them for several days
using a homebrewed downconverter with two low noise triodes 6AN4 in a
cascode input stage and a simple three elements yagi.
At that epoch time the 108 MHz band was used only for aeronautical and space
communications but not for FM broadcasting as novadays so that it was free
of interfering signals and man made noise and the only existing noise was
the galactic noise.
By the way in the early 1960 it was my first received satellite signal and
it was very exiting to receive the 45 mW beacons using only a three elements
yagi and a downconverter with a noise figure at best of 6 dB while to see
the balloon as a bright star by naked eye flying in the night.
For more technical informations on ECHO-1 ,ECHO-1A and ECHO-2 look at
the following web page:
http://msl.jpl.nasa.gov/QuickLooks/echoQL.html
73" de
i8CVS Domenico
----- Original Message -----
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
To: <bruninga@xxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Tuesday, June 29, 2010 7:03 AM
Subject: [amsat-bb] Re: HF Satellite Relay
>
> Well, it's finally happened. We've come full circle. They've reinvented
Echo-1.
> http://en.wikipedia.org/wiki/Project_Echo
>
> Of course, that one was 10x larger. What makes this a 10m (band)
operation? I expect it would work on the higher bands too, especially with
the smaller size. What band did they use ~50-ish years ago?
>
> Greg KO6TH
>
>
> > From: bruninga@xxxx.xxx
> > To: amsat-bb@xxxxx.xxx
> Cancel
> > Date: Mon, 28 Jun 2010 13:44:45 -0400
> > Subject: [amsat-bb] HF Satellite Relay
> >
> > Heard today of a Passive HF relay satellite being proposed.
> > Wondered if Hams could relay off of it.
> >
> > It's a 10m diameter sphere.
> > I assumed a 10m signal and 1000 Watts
> > And antenna gains at both ends of 10 dB.
> > Unless I made a dumb error, it looks impossible?
> > I get a received signal of -170 dBm
> > Compared to a good HF receiver of -122 dBm
> > So its 48 dB down in the noise.
> > Going to narrow band, could improve things, but the Doppler of
> > +/- 600 Hz would make that difficult.
> >
> > Anyway, if someone else wants to double check the link budget
> > using the radar range equation, go for it.
> >
> > The beauty of this system is that it is perfectly spherical, so
> > the reflection coefficient would be constant within 1 dB. That
> > is the advantage over trying to use the ISS or other large
> > rocket body... They vary by 20 dB making communication by
> > reflection impossible.
> >
> > Oh, and it would be in space for 30 years or more. So with
> > something that reliable, it would be worth developing an amateur
> > capability to use it.
> > It is not designed for comms, but as a calibration sphere for
> > over the horizon radars that have LOTS more power and LOTS more
> > gain than we do.
> >
> > Bob, Wb4APR
> >
> >
> > _______________________________________________
> > 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
>
> _________________________________________________________________
> The New Busy is not the old busy. Search, chat and e-mail from your inbox.
>
http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:W
L:en-US:WM_HMP:042010_3
> _______________________________________________
> 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: 8
Date: Tue, 29 Jun 2010 14:25:44 -0400
From: "Robert Bruninga" <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: Pass prediction algorithm
To: "'Kai Gunter Brandt'" <kai.brandt@xxx.xxx.xx>,
<amsat-bb@xxxxx.xxx>
Message-ID: <3493AB2D36F946089D83C5FE9ADA011D@xxxxx.xxxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
> sending %HIGH to the TM-D710 is just spelling each letter :o/
There is a list of codes somewhere. To speak one of the pre-set
words, you just include the text %XX where XX is a two byte HEX
value of the word you want spoken. I guess you could just try
all 256 codes and write down the words spoken? Should be the
same voice chip as in the D700.
Bob
WB4APR
> And if it is like the original APRSdata.EXE, [the
> elevation of the satellite object is]... encoded
> with a leading % sign so that the D700 radio with
> a voice chip will actually SPEAK [the elevation]
> "HIGH" and "LOW" so you never even have to
> look at the radio.
------------------------------
Message: 9
Date: Tue, 29 Jun 2010 14:30:25 -0400
From: "Robert Bruninga" <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: HF Satellite Relay
To: "'Joe'" <nss@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <46500EED7D874B11B4C2EA6B6EDBE95B@xxxxx.xxxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
>> They've reinvented Echo-1.
>> http://en.wikipedia.org/wiki/Project_Echo
>>
>> Of course, that one was 10x larger.
> What makes this a 10m (band) operation?
> I expect it would work on the higher bands ...
This one is not a full surface sphere, but a bucky-ball wire
frame with about 4 foot thin sides to each polygon making a 10
meter diameter very open structure. SO anything higher in freq
just goes right through.
Bob, WB4APR
------------------------------
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End of AMSAT-BB Digest, Vol 5, Issue 284
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