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CX2SA > SATDIG 08.08.11 19:31l 757 Lines 24368 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. iss beacon receive and vhf preamp (N. Mahdinejad)
2. ARISSat deployment direction? (Rich Dailey)
3. Re: ARISSat deployment direction? (jmfranke)
4. Re: ARISSat deployment direction? (Roland Zurmely)
5. Re: ARISSat deployment direction? (Alan P. Biddle)
6. Re: ARISSat deployment direction? (Rich Dailey)
7. Re: FUNcube Dongle firmware update (Mineo Wakita)
8. receive beacon in l band and s-band (N. Mahdinejad)
9. Fwd: Fw: antenna rotator test (N. Mahdinejad)
10. Re: gps accuracy (Patrick STODDARD (WD9EWK/VA7EWK))
11. Diamond A430S15 Antenna Dimensions (Sion Chow Q. C. (9W2QC))
12. Beam Elevation (mm0kjg)
13. Re: Beam Elevation (Lowell White)
14. Re: W1AW/5 Taos, NM (Ollie Eisman)
15. Re: gps accuracy (Patrick STODDARD (WD9EWK/VA7EWK))
16. ARISSat TLM test WAV file pointer (PA3GUO)
17. Re: Beam Elevation (Bob Bruninga )
----------------------------------------------------------------------
Message: 1
Date: Mon, 8 Aug 2011 17:01:27 +0430
From: "N. Mahdinejad" <n.mahdinejad@xxxxx.xxx>
Subject: [amsat-bb] iss beacon receive and vhf preamp
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<CAH27MAO80sW1JD09EnRwZfU8=805r+C=WCM_dJ5BA9yzhGSVPQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
Dear amsat members.
I have some question about receiving beacon signal from ISS.
Could you please help me?
1. What is the difference between ISS, ARISS and ZARYA? Is these
different satellites or 1 satellite with 3 name?
2. Which of them is easier to receive beacon from them?
3. Frequency of beacon signal of ISS is in VHF band. Is it available
without preamp? I use 2 preamp. One for VHF and 1 for UHF band. But the
preamp in vhf band isn?t on. I mean that icom receiver could not supply it.
I activate preamp in vhf band in set menu of icom radio. The uhf band
preamp on and I use it. But for vhf when I push the preamp button in front
panel of icom the preamp writing is visible for 2 seconds and then
turned off and isn?t visible.
Any help would be gratefully appreciated.
Beat Regards.
N.Mahdinejad
------------------------------
Message: 2
Date: Mon, 08 Aug 2011 08:44:17 -0400
From: Rich Dailey <richdailey@xxxxxxxxxx.xxx>
Subject: [amsat-bb] ARISSat deployment direction?
To: amsat-bb@xxxxx.xxx
Message-ID: <7.0.0.16.2.20110808081748.02434a88@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I've seen several comments and reports stating the deployment was
against the ISS velocity vector. Why do I see arissat out ahead of ISS
by a few hundred miles? Keps are current, and 3 tracking programs are in
agreement. Can someone provide enlightenment? tnx...:-)
Rich, N8UX.
------------------------------
Message: 3
Date: Mon, 8 Aug 2011 08:58:58 -0400
From: "jmfranke" <jmfranke@xxx.xxx>
Subject: [amsat-bb] Re: ARISSat deployment direction?
To: <amsat-bb@xxxxx.xxx>, "Rich Dailey" <richdailey@xxxxxxxxxx.xxx>
Message-ID: <DBC1DAF5C5E6422186D903B397204967@xxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
With the speed reduction, the satellite drops to a lower orbit. The lower
the orbit, the less time it takes to go around the Earth, hence it passes
satellites in higher orbits.
John WA4WDL
--------------------------------------------------
From: "Rich Dailey" <richdailey@xxxxxxxxxx.xxx>
Sent: Monday, August 08, 2011 8:44 AM
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] ARISSat deployment direction?
> I've seen several comments and reports stating the deployment was
> against the ISS velocity vector. Why do I see arissat out ahead of ISS
> by a few hundred miles? Keps are current, and 3 tracking programs are in
> agreement. Can someone provide enlightenment? tnx...:-)
>
> Rich, N8UX.
>
> _______________________________________________
> 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: 4
Date: Mon, 8 Aug 2011 06:04:49 -0700 (PDT)
From: Roland Zurmely <py4zbz@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat deployment direction?
To: AMSAT <amsat-bb@xxxxx.xxx>
Message-ID:
<1312808689.57167.YahooMailNeo@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
That's right! See why here :
http://www.qsl.net/py4zbz/satelite/atrito.htm
Sorry, is in Portuguese. Use the google translator.
73 de Roland PY4ZBZ
------------------------------
Message: 5
Date: Mon, 8 Aug 2011 08:09:52 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat deployment direction?
To: "'Rich Dailey'" <richdailey@xxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <3E110C6847D34D86831580B44F1F7A3F@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Rich,
Orbital dynamics are not all that intuitive. Hand waving answer: By
kicking it off the tailgate, it was deployed into a _slightly_ lower orbit.
You can see that showing up in your tracking programs as well. However,
objects in lower orbits have shorter periods. At 370 km the ISS is about 90
minutes, while satellites at 36,000 km take a day, and are geosynchronous.
In fact, as the nominal altitude of the ISS, a single kilometer change of
height results in a 19 second difference per day in the AOS. That has been
adding up.
73s,
Alan
WA4SCA
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Rich Dailey
Sent: Monday, August 08, 2011 7:44 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ARISSat deployment direction?
I've seen several comments and reports stating the deployment was
against the ISS velocity vector. Why do I see arissat out ahead of ISS
by a few hundred miles? Keps are current, and 3 tracking programs are in
agreement. Can someone provide enlightenment? tnx...:-)
Rich, N8UX.
_______________________________________________
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: 6
Date: Mon, 08 Aug 2011 09:30:01 -0400
From: Rich Dailey <redailey1@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat deployment direction?
To: amsat-bb@xxxxx.xxx
Message-ID: <7.0.0.16.2.20110808092804.0243b440@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Thanks to John, Roland, and Alan for answering this. Makes perfect sense,
I was having a head-scratching moment though. Enlightenment received and
appreciated!
N8UX.
At 09:09 AM 8/8/2011, you wrote:
>Rich,
>
>Orbital dynamics are not all that intuitive. Hand waving answer: By
>kicking it off the tailgate, it was deployed into a _slightly_ lower orbit.
>You can see that showing up in your tracking programs as well. However,
>objects in lower orbits have shorter periods. At 370 km the ISS is about 90
>minutes, while satellites at 36,000 km take a day, and are geosynchronous.
>In fact, as the nominal altitude of the ISS, a single kilometer change of
>height results in a 19 second difference per day in the AOS. That has been
>adding up.
>
>73s,
>
>Alan
>WA4SCA
>
>
>
>-----Original Message-----
>From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
>Behalf Of Rich Dailey
>Sent: Monday, August 08, 2011 7:44 AM
>To: amsat-bb@xxxxx.xxx
>Subject: [amsat-bb] ARISSat deployment direction?
>
>I've seen several comments and reports stating the deployment was
>against the ISS velocity vector. Why do I see arissat out ahead of ISS
>by a few hundred miles? Keps are current, and 3 tracking programs are in
>agreement. Can someone provide enlightenment? tnx...:-)
>
>Rich, N8UX.
>
>_______________________________________________
>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
------------------------------
Message: 7
Date: Mon, 8 Aug 2011 23:07:49 +0900
From: "Mineo Wakita" <ei7m-wkt@xxxxxxxxx.xx.xx>
Subject: [amsat-bb] Re: FUNcube Dongle firmware update
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000301cc55d4$920e7330$0300a8c0@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-2022-jp";
reply-type=original
Hello Howard,
Thanks for a new firmware version of FCD.
http://www.ne.jp/asahi/hamradio/je9pel/fcd_upde.htm
JE9PEL, Mineo Wakita
------------------------------
Message: 8
Date: Mon, 8 Aug 2011 18:54:20 +0430
From: "N. Mahdinejad" <n.mahdinejad@xxxxx.xxx>
Subject: [amsat-bb] receive beacon in l band and s-band
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<CAH27MAMSXrvBpnQ4wPYmrKY=Vsd+L02ru6Kq4t15v-cHE5bw6g@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Dear Amsat members.
is there any one who can recive beacon or telemtry signal of amateur
satellites in l or s band.
if yes please say the names of these satellites.
in amsat website " operational oscar satellite status" only the co-65, ao-51
and so-33 has signal in l band but all of them is non operational.
is there any satellite out of these names that we could recive their beacon
or telemetry signal?
I am lloking forward to hearing from you.
Best Regards.
N.Mahdinejad.
------------------------------
Message: 9
Date: Mon, 8 Aug 2011 19:07:17 +0430
From: "N. Mahdinejad" <n.mahdinejad@xxxxx.xxx>
Subject: [amsat-bb] Fwd: Fw: antenna rotator test
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<CAH27MAO=hcwaMq6EqW9sTiimJS3-hnNG-tUJYK8TzS+kVRLHog@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
---------- Forwarded message ----------
From: N. Mahdinejad <n.mahdinejad@xxxxx.xxx>
Date: Mon, Aug 8, 2011 at 7:07 PM
Subject: Re: Fw: [amsat-bb] antenna rotator test
To: i8cvs <domenico.i8cvs@xxx.xx>
Dear Domenico.
there is something not clear for me.
could you please tell me step by step what should i do for antenna pointin
accuracy test with sun noise?
I know that
1. predict the azimyth and elevation of sun versus time due to my
groundstation latitude and longitude.
2. point the antennna to that az and el
3. set the ferequency of my reciver to the sun noise ferequency. for e.g
because my antenna is in s band i shoul set the receiver to 2304 MHz. and
also my receiver must be s band reciver..
4. now i should move the antenna +-5 degree in both az and el direction to
hear maximum niose.
5. where the maximum niose is the right angel and the diffrence between
stage 2 angles with these angles is pointing accuracy.
is there steps true?
Im lloking forward to hearinh from you.
any help would be gratefully appreciated.
Best Rinejad@xxxxx.xxx>
> > Sent: Saturday, August 06, 2011 4:07 PM
> > Subject: Re: [amsat-bb] antenna rotator test
> >
> >
> > > Hi, N.Mahdinejad
> > >
> > > Please find here included the program NOISE.EXE by wich you can
> calculate
> > > how much Sun Noise you can receive from the Sun at about 2.5 GHz
> > >
> > > To get the daily WWV Solar Flux in sfu (Solar Flux Units) go to the
> > > following internet page.
> > >
> > > http://www.swpc.noaa.gov/ftpdir/indices/DSD.txt
> > >
> > > Also read and study the article Estimating Sun Noise at Various
> > Frequencies
> > > by
> > > WR0I
> > >
> > > 73" de
> > >
> > > i8CVS Domenico
> > >
> > > ----- Original Message -----
> > > From: "N. Mahdinejad" <n.mahdinejad@xxxxx.xxx>
> > > To: "i8cvs" <domenico.i8cvs@xxx.xx>
> > > Sent: Saturday, August 06, 2011 1:53 PM
> > > Subject: Re: [amsat-bb] antenna rotator test
> > >
> > >
> > > > Dear Mr Domenico and Mr Brain
> > > > Thanks for your attention.
> > > > My research ferequency is about 2.5 GHz,how I can get the maximum
> > > > sun noise? I mean that how I know that the sun noise now is maximum.
> I
> > > > think that I dont have clear meaninig of sun noise and how to measure
> > > > it. but I have tracking program that show the position of sun and
> also
> > > > azimuth and elevation of sun reaching in my ground station in
> > > > different time.
> > > > Im looking forward to hearing from you.
> > > > Best Regards.
> > > >
> > > > On 8/4/11, i8cvs <domenico.i8cvs@xxx.xx> wrote:
> > > > > Hi, N.Mahdinejad
> > > > >
> > > > > The pointing of the antenna in wich you get the maximum Sun Noise
> is
> > the
> > > > > real pointing of the antenna.Adjust the Azimuth and Elevation
> reading
> > as
> > > per
> > > > > the indication of your tracking program for the Sun.
> > > > >
> > > > >
> > > > > 73" de
> > > > >
> > > > > i8CVS Domenico
> > > > > ----- Original Message -----
> > > > > From: N. Mahdinejad
> > > > > To: i8cvs
> > > > > Sent: Wednesday, August 03, 2011 2:40 PM
> > > > > Subject: Re: [amsat-bb] antenna rotator test
> > > > >
> > > > >
> > > > >
> > > > > Dear Domenico
> > > > > THANKS FOR YOUR ANSWER.
> > > > > I have some question.
> > > > > in this case how i calculate the pointing accuracy? i mean that
> how
> > > could
> > > > > i dentify the diffrence between the sun noise actual location and
> the
> > > > > location of antenna pointing?
> > > > > thanks for your help and attention.
> > > > > Best Regards.
> > > > >
> > > > > On Wed, Aug 3, 2011 at 2:44 PM, i8cvs <domenico.i8cvs@xxx.xx>
> wrote:
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "N. Mahdinejad" <n.mahdinejad@xxxxx.xxx>
> > > > > To: <amsat-bb@xxxxx.xxx>
> > > > > Sent: Tuesday, August 02, 2011 2:51 PM
> > > > > Subject: [amsat-bb] antenna rot > N.Mahdinejad
> > > > >
> > > > > > _______________________________________________
> > > > >
> > > > > Hi, N.Mahdinejad
> > > > >
> > > > > You don't mention the frequency used for your 2 or 3 meter
> dish.
> > > > >
> > > > > By the way the best procedure to test the point accuracy for a
> 2
> > or
> > > 3
> > > > > meter dish is to receive the Sun Noise at the frequency of
> > > operation.
> > > > >
> > > > > Using any satellite traking program you can compute the azimuth
> > and
> > > > > elevation of the Sun for a particular time and then chek if you
> > > receive
> > > > > the strongest Sun Noise in the same azimut and elevation
> indicated
> > > by
> > > > > the satellite traking program.
> > > > >
> > > > > If the maximum Sun Noise do not match with the pointing of your
> > dish
> > > > > than move mechanically the orientation of yor dish in order to
> get
> > > the
> > > > > maximum Sun Noise at that specific time of dish pointing
> > > adjustement.
> > > > >
> > > > > 73" de
> > > > >
> > > > > i8CVS Domenico
> > > > >
> > > > >
> > > > >
> > > > >
> > >
> >
>
------------------------------
Message: 10
Date: Mon, 8 Aug 2011 08:29:41 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] Re: gps accuracy
To: amsat-bb@xxxxx.xxx
Message-ID:
<CAN6TEUcnp0tanCNTvwneLods28MaCPh_pGZXru4cc6J=8d12TA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi Phil!
> I'm not a grid-square chaser so I'm not familiar with the customs, but
> doesn't this seem just a *little* out of touch with the spirit of the rules?
I don't think it's out of touch with the spirit of the VUCC rules. If
anything,
it's exactly within the letter and spirit of the current rules. Once you know
where the intersection or boundary line is located, you make sure your
station occupies some part of each grid, as explained in sections 4(e)
and 4(f) of the VUCC rules:
http://www.arrl.org/files/file/Awards/VUCC%20Rules%202011_Rev%2020110512.pdf
In the past, these sections were not as verbose as they are now. The
VUCC rules previously stated that you had to be able to provide ARRL
documentation if requested and that GPS was acceptable in determining
your location on a boundary or intersection. There were no definitions
of how a portable or mobile station had to be situated, no mention of the
GPS accuracy or WAAS, and no mention of what would be acceptable
documentation of a station on a boundary or intersection.
Using KB5WIA's trip as the example, what better way to know that your
station is in all 4 grids than to determine where that intersection is, and
then making sure equipment is in each of the grids? Dave went to some
lengths with ARRL to make sure his plans would pass muster with them,
evenplain; charset=ISO-8859-1
Hi Kev,
The most likely responses you get will be for a fixed elevation of 15 to 30
degrees. It's a frequent topic:-).
Good luck!
Lowell
K9LDW
------ Original Message ------
Received: Mon, 08 Aug 2011 11:11:52 AM CDT
From: mm0kjg <mm0kjg@xxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Beam Elevation
> Hello there.
> I have a dual band beam in my loft space on a standard East West rotator .
> Can hear and work the Sat's on it but receive is quite poor. Cant put
> antenna outside so can someone please advice what sort of elevation I should
> erect the antenna at for limited space etc. At moment it sits horizontal.
>
>
> Cheers Kev
> MM0KJG
>
------------------------------
Message: 14
Date: Mon, 8 Aug 2011 10:27:29 -0600
From: Ollie Eisman <ollie@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: W1AW/5 Taos, NM
To: amsat-bb@xxxxx.xxx
Message-ID: <E4D1DDF2-390E-4F01-9796-AEF4DBA5A6D0@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Just wanted to say thank you to everyone for the satellite contacts during
the ARRL Rocky Mtn. Convention in Taos. We had hundreds of people stop by
during the event with tons of interest in AMSAT and satellite operating.
Special thanks to Rodney, KC0ZHF, for his help during the passes. Early on
we had rotor control problems due to a bad USB<>serial interface driver.
Having Rodney there to make the contacts while I adjusted the AZ/EL was a
lifesaver. He also helped answer many of the questions coming our way
about working the birds.
I put some pictures online of the station setup on my QRZ page.
73,
Ollie AJ1O
>
>
> Date: Fri, 5 Aug 2011 20:10:44 -0700 (PDT)
> From: Rodney Waln <kc0zhf@xxxxx.xxx>
> Subject: [amsat-bb] W1AW/5 Taos, NM
> To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
> Message-ID:
> <1312600244.45256.YahooMailNeo@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
> Content-Type: text/plain; charset=iso-8859-1
>
> http://www.2011convention.org/w1aw.html
> ?
> aj1o?and kc0zhf will be operating and demoing from the 1973 pinzgauer
> and tripod trailer as w1aw/5 on numerous satellite passes from dm76 please
follow instructions
> for qsl on the above link, Fri, sat and Sunday morning from the convention,
> hope to work you,
>
>
------------------------------
Message: 15
Date: Mon, 8 Aug 2011 09:30:41 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] Re: gps accuracy
To: amsat-bb@xxxxx.xxx
Message-ID:
<CAN6TEUeV3Sia+9JJ8=QO+FpAWFa7svLQ8VHcYFp_9-j1TEAebA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi John!
> What is it only need to have the GPS at *one* location, which will be
> the intersection of the 4 grids (40 degrees North, 124 degrees West)
>
> -OR-
>
> in all 4 girds around the intersection.
>
> If I'm standing there looking at the darn thing within feet
> of it would that do?
Only if you had your station, or parts of it, on the boundary or
intersection.
Again, the complete VUCC rules can be found at the following link:
http://www.arrl.org/files/file/Awards/VUCC%20Rules%202011_Rev%2020110512.pdf
Please read through sections 4(e) regarding stations located at grid
boundaries and intersections and 4(f) regarding GPS receivers and
their requirements. That should answer questions about locating
the stations *on* the line/intersection and not just *near* those spots.
If you have more questions about these rules, ARRL now has a new
e-mail address for VUCC-related matters: VUCCaward @ arrl.org
If the VUCC rules were as liberal as you mentioned about county
hunting, I'm sure many more grid boundaries and intersections
could be on the air. It would be so much easier, and that may
have been some of the motivation in the rule changes a couple
of years ago. I know of several different places I could put on
the air where I could see the intersection of 4 grids, but can't
actually put my station on the spot due to property ownership
(DM32/DM33/DM42/DM43 is in a farmer's field south of Phoenix -
I usually work from DM32/DM42 just south of this spot along a
road) or safety (DM35/DM36/DM45/DM46 is just inside the Grand
Canyon, north of its South Rim and east of Grand Canyon
Village) - among other places.
73!
.
would be useful to place this on www.arissattlm.org
Henk, PA3GUO
Hi Henk.
I've had some issues with decoding BPSK too.? Worked fine on the first day,
then unable to decode anything.
Eventually I reloaded the software and played a wav file through the system.
Finally it began decoding again. I don't really know what the problem was.
It still will not send tlm via the internet and I can't get sound
out...Hence the wav files.
Problem is the wav file I have is large so I cant send it to you to try.
Perhaps some one has 30 seconds worth that does decode, then we can use that
as a standard to check our systems.
I've been tracking doppler by hand. Seems to work OK but it's very important
to keep the CW in the 'blue' window.
I would think jumps would not be good. Perhaps frequent doppler updates.? -
So very small jumps.
I also heard HB9 last night on the transponder, but in low power mode (45
sec)that is difficult. - I'll wait for some daylight passes.
Good luck
David G0MRF
-----Original Message-----
From: PA3GUO <pa3guo@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Mon, 8 Aug 2011 10:41
Subject: [amsat-bb] ARISSat TLM decoding using FCD
Just sharing the results of my recordings of last night:
(using the FCD + HDSDR)
- FM voice works fine
- Xponder works fine (HB9AOB was very clear)
- CW decoding works fine (the Tuning indicator locks on the CW
bump)
- BPSK decoding did not work (I hear & see the signal, but no
decode)
Is the BPSK decoding very sensitive to doppler / freq hops ?
Henk, PA3GUO
_______________________________________________
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: 17
Date: Mon, 8 Aug 2011 13:23:01 -0400 (EDT)
From: "Bob Bruninga " <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: Beam Elevation
To: "Lowell White" <whiteld@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <201108081723.020613@xxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
>> I have a dual band beam in my loft space
>> on a standard East West rotator .
>> Can hear and work the Sat's on it but
>> receive is quite poor... what sort of elevation
>> should I erect the antenna..
It depends!
If your antenna can see down to the horizon (where you need max gain) then
the answer is 15 deg.
See Analysis: http://aprs.org/rotator1.html
But if you cannot hear down there anyway, because you are working through
trees and 10 dB of structural wood, tar and asphault (roof) then you should
give up on the low elevations and improve your higher angle performance.
But just remember that almost 70% of all satellite access times are BELOW 20
degrees! But if your site cannot see them or work them down there, then
give up on horizon gain and plan on having a better signal but only able to
work 1/3rd of the pass well.
Bob, WB4APR
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End of AMSAT-BB Digest, Vol 6, Issue 446
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