i8cvs wrote:
Hi All,
I have received an email from Daniel Esteban LU2DDU informing me that
about the Arecibo radiotelescope he was in touch with Victor KP4PQ in order
to get from him more details about the feed line running from the operating
site up to the feed.
Victor says to Daniel that
Just to add to this discussion of decimal separators, my Canadian
province of New Brunswick is bilingual, and therefore has overlapping
French-speaking and English-speaking school boards. Those in the
French schools and the 30% of the English who have opted to be taught
in French immersion express
At 02:20 AM 4/22/2010, Stephen Melachrinos wrote:
Ah, but this focuses on my question: Why is ERP referenced to a
dipole? Why did someone assume that Arecibo's stated gain of 60 dB
was dBd and not dBi? I've never seen the gain of a dish antenna used
in satellite work quoted in dBd. All of the
At 07:46 AM 4/22/2010, Edward Cole wrote:
At 02:20 AM 4/22/2010, Stephen Melachrinos wrote:
Ah, but this focuses on my question: Why is ERP referenced to a
dipole? Why did someone assume that Arecibo's stated gain of 60 dB
was dBd and not dBi? I've never seen the gain of a dish antenna used
in
Wow that's all messed up?
I'm 52 and this is the very first time i have ever seen anything like
this and i have been dealing with science worldwide all my life. wow.
Joe
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/22/2010 1:14 PM, Sil - ZL2CIA wrote:
- Original Message -
From: Sil - ZL2CIA zl2...@amsat.org
To: Idle-Tyme n...@mwt.net
Cc: i8cvs domenico.i8...@tin.it; AMSAT-BB amsat-bb@amsat.org
Sent: Thursday, April 22, 2010 8:14 PM
Subject: Re: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some
calculations)
In the Netherlands
-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
- Original Message -
From: Sil - ZL2CIA zl2...@amsat.org
To: Idle-Tyme n...@mwt.net
Cc: i8cvs domenico.i8...@tin.it; AMSAT-BB amsat-bb@amsat.org
Sent: Thursday, April 22, 2010 8:14 PM
Subject: Re: [amsat-bb] Re: Arecibo on 432 MHz
. Or binary :)
Mark N8MH
Sent via BlackBerry from T-Mobile
-Original Message-
From: i8cvs domenico.i8...@tin.it
Date: Thu, 22 Apr 2010 23:12:16
To: Sil - ZL2CIAzl2...@amsat.org; Idle-Tymen...@mwt.net
Cc: AMSAT-BBamsat-bb@amsat.org
Subject: [amsat-bb] Re: Arecibo on 432 MHz
--- On Thu, 4/22/10, Mark Hammond N8MH marklhamm...@gmail.com wrote:
I think we should all use
hexidecimal. Or binary :)
I tell my electronics students that we can express gain or loss in dB by taking
the log of power ratios and multiplying by 10, or by taking the log of the
voltage or
Nigel -
There are lots of lots of reasons ...
1. All link budgets use a path loss calculation that's also referenced to an
isotropic radiator. If you use antenna gain referenced to a dipole, you'll have
to add back the gain of the dipole (referenced to the isotropic radiator).
2. It's the
...@amsat.org] On
Behalf Of Edward Cole
Sent: Thursday, April 22, 2010 8:47 AM
To: w...@arrl.net; amsat-bb@amsat.org
Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
At 02:20 AM 4/22/2010, Stephen Melachrinos wrote:
Ah, but this focuses on my question: Why is ERP referenced
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Nigel Gunn G8IFF/W8IFF
Sent: Thursday, April 22, 2010 6:15 AM
To: w...@arrl.net
Cc: amsat-bb@amsat.org; Stephen Melachrinos
Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations
60dBi is abt 57dB
It means 10exp5,7
ERP was 400x10exp5,7 W
- Original Message -
From: Fabio A iw8...@amsat.org
To: AMSAT-BB@amsat.org
Sent: Tuesday, April 20, 2010 8:26 PM
Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
Hello all,
just a curiosity, how did
Of course, this ia all rubbish as the stated power of 243TeraWatts (READ BELOW
CAREFULLY) is clearly not true.
That would require an antenna gain of, in the regeon of, 120dB.
On 21-Apr-10 17:49, i8cvs wrote:
The only official data given for Arecibo by WF1F are the following :
The 1,000 foot
- Original Message -
From: Nigel Gunn G8IFF/W8IFF ni...@ngunn.net
To: i8cvs domenico.i8...@tin.it
Cc: Fabio A iw8...@amsat.org; AMSAT-BB amsat-bb@amsat.org; Mateusz
sq7...@poczta.onet.pl
Sent: Wednesday, April 21, 2010 9:07 PM
Subject: Re: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce
What was written was (243 million, 902 thousand, 443 units) million watts.
That's 243 Terawatts.
On 21-Apr-10 21:23, i8cvs wrote:
I disagree with your numbars:
1 tera watt =1 TW = 1 x 10^12 watt or 1,000,000,000,000 watt
1 mega watt = 1MW = 1 x 10^6 watt or 1,000,000 watt or 1 million watt
Subject: Re: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some
calculations)
Of course, this ia all rubbish as the stated power of 243TeraWatts (READ
BELOW CAREFULLY) is clearly not true.
That would require an antenna gain of, in the regeon of, 120dB.
On 21-Apr-10 17:49, i8cvs wrote
- Original Message -
From: Nigel Gunn G8IFF/W8IFF ni...@ngunn.net
To: i8cvs domenico.i8...@tin.it
Cc: Fabio A iw8...@amsat.org; AMSAT-BB amsat-bb@amsat.org; Mateusz
sq7...@poczta.onet.pl
Sent: Wednesday, April 21, 2010 11:37 PM
Subject: Re: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce
Agreed.
The only thing, other than for times and dates, that I write between numbers is
a decimal point.
Commas and dots to split numbers into groups of three have no use.
OK, I might write 5 megawatts as 5E6 watts.
On 21-Apr-10 22:22, i8cvs wrote:
Wath make confusion in the WF1F
People need to learn engineering significance. Just because a
calculator spits out 9 digits of precision, using them all shows
a lack of understanding. The value is 244 million watts. The
significance of all the other digits is absolutely meaningless!
The original post was about 400 watts and
That because we English do it that way. The rest of the Europe, Germany
and France for instance, seem to like inserting a comma instead!
:-D
David
KG4ZLB
On 4/21/2010 18:45, Nigel Gunn G8IFF/W8IFF wrote:
Agreed.
The only thing, other than for times and dates, that I write between
And, as usual, your opinion is absolutely true.
Only needs to be to the precision that you can measure or the nearest
preferred value.
On 21-Apr-10 22:57, Robert Bruninga wrote:
People need to learn engineering significance. Just because a
calculator spits out 9 digits of precision, using
Comma or no comma, shouldn't matter
1000 mega watts or 1,000 Mega watts is still one thousand million
watts! NOT one thousands watts. true?
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/21/2010 6:14 PM, David - KG4ZLB wrote:
That because we English do
Is it the original?
I had a mass produced plastic one (with a 50Hz motor) back in the early 1980's
(or earlier).
Unfortunately, your web site doesn't appear to give dates.
On 21-Apr-10 23:28, Idle-Tyme wrote:
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
- Original Message -
From: Idle-Tyme n...@mwt.net
To: amsat-bb@amsat.org
Sent: Thursday, April 22, 2010 1:28 AM
Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
Comma or no comma, shouldn't matter
1000 mega watts or 1,000 Mega watts is still one thousand
- Original Message -
From: tosca...@umn.edu
To: i8cvs domenico.i8...@tin.it
Cc: Nigel Gunn G8IFF/W8IFF ni...@ngunn.net; AMSAT-BB
amsat-bb@amsat.org; Fabio A iw8...@amsat.org
Sent: Thursday, April 22, 2010 12:04 AM
Subject: Re: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some
Yes this is the original made by the person that made and trained most
of the assemblers all those years ago. Read the history page it's
pretty interesting.
The plastic junk one was a license on our patent. We thought of it like
a Mc Donalds quarter pounder with cheese vs a nice sirloin
Hello all,
just a curiosity, how did you found that the ERP is ... 243,902,443 Million
Watts.
Thanks
73s
Fabio
iw8qku
- Original Message -
From: MM ka1...@yahoo.com
To: amsat-bb@amsat.org
Sent: Wednesday, April 07, 2010 3:06 PM
Subject: [amsat-bb] Arecibo on 432 MHz Moon Bounce
Hi
I heard it last night, around 2045UTC on 432.0564MHz with my 11-element
ex-PMR yagi and Kenwood TH-F7E at my QTH in IO75vs. The CW was a bit
too fast for me to copy, and it was all a bit noisy (moon pretty close
to the horizon) but if I'd stuck in at the Koch method (I should spend
more time on
...@gmail.com
To: domenico.i8...@tin.it; amsat-bb@amsat.org
Subject: [amsat-bb] Re: Arecibo
This was my experience with a KLM 435-40CX and no preamp into a
FT-736R. I had to energize the relay on the antenna in order to hear
them. I assume it's RHCP normally, and LHCP when the relay is energized.
I
SO, did you work them on the FT817???
73s John AA5JG
--- On Sun, 4/18/10, David Barber david.bar...@dbelectronics.co.uk wrote:
From: David Barber david.bar...@dbelectronics.co.uk
Subject: [amsat-bb] Arecibo on Handy
To: 'Moon-Net' moon-...@list-serv.davidv.net, amsat-bb@amsat.org
Date:
have you peaked them in polarity also?
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/18/2010 2:37 PM, David Barber wrote:
OK, I know nobody is going to believe this buton my life...
I have been outside with an FT-817 connected via a very short
[mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Idle-Tyme
Sent: 18 April 2010 21:05
To: amsat-bb@amsat.org
Subject: [amsat-bb] Re: Arecibo on Handy
have you peaked them in polarity also?
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/18/2010 2:37 PM, David Barber
Of Idle-Tyme
Sent: 18 April 2010 21:05
To: amsat-bb@amsat.org
Subject: [amsat-bb] Re: Arecibo on Handy
have you peaked them in polarity also?
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/18/2010 2:37 PM, David Barber wrote:
OK, I know nobody
@amsat.org
Subject: [amsat-bb] Re: Arecibo on Handy
I found there to be little or no difference when rotating the polarity.
I've also been asked what frequency I was listening on. The FT817 was in
USB mode and the displayed frequency was 432.04340MHz
David
G8OQW
-Original Message
Watching the web cam, I was constantly cringing. Yes they needed better
Op's I was copying calls off the echoy web audio and they had no clue.
Or how they never waited long enough after cqing to get an answer. half
the time they would call cq tubne a bit and in like 2 or 3 seconds
theyd be
To: david.bar...@dbelectronics.co.uk; Idle-Tyme n...@mwt.net;
amsat-bb@amsat.org
Sent: Sun, April 18, 2010 6:06:32 PM
Subject: [amsat-bb] Re: Arecibo on Handy
David and all,
I copied them here at 432.0446 in CW using a Yaesu FT-817ND and Elk
dual-band yagi with 6 feet of RG8X between the antenna
Hearing them R3 S1 here in UK. Peaking S3.
19 element Tonna on 4ft ground mounted tripod.
SSB SP7000
IC910
David
G8OQW
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Mark L. Hammond
Sent: 17 April 2010 18:41
To: Amsat-bb
Today on my single M2 antenna, many times they are Q5. Their amp has made a
difference from yesterday when they were outputting only about 30 watts or so.
For those who want to hear them live from a real antenna (25 meter dish!),
check out this link:
http://websdr.camras.nl:8901/
Move the
I didn't hear them at all yesterday, but today they about RST 22 on
phone. Using KLM 435-18c and left hand polarization. SSB Elec mast
mounted amp. CW should be better.
It is interesting to watch/listen to the web cast:
http://www.ustream.tv/channel/kp4ao-eme
The sign on the op position says
At 10:31 AM 4/17/2010, Edward Cole wrote:
At 09:41 AM 4/17/2010, Mark L. Hammond wrote:
Hearing test carriers MUCH better today! Give it a listen, they are
saying 350W output today (rather than 30W yesterday ;)
73!
Mark N8MH
Mark L. Hammond [N8MH]
I'm copying them today. Was able to hear the SSB just barely above
noise, marginal copy. On CW, they're between 519 and 529 on my 7 element
WA5VJB cheap yagi and mast-mounted SSB electronics premp grafted onto my
2m EME array.
I was able to detect the signal yesterday using WSJT, but it wasn't
Nothing heard on SSB but as soon as they switched to CW the signal came
in very loud!
David
KG4ZLB
EL96
On 4/17/2010 15:28, Edward Cole wrote:
At 10:31 AM 4/17/2010, Edward Cole wrote:
Briefly heard voice on 432.044.500 about 1920 when Moon was 24.5
deg.elevation; maybe the Moon
Hi Bob, W7LRD
What polarization have you used on your 40 el cp ? RHCP or LHCP ? I am sure
that with LHCP it was a very consistant signal and with RHCP nothing was
heard.
Please confirm !
Tanks
73 de
i8CVS Domenico
- Original Message -
From: Bob- W7LRD w7...@comcast.net
To:
This was my experience with a KLM 435-40CX and no preamp into a
FT-736R. I had to energize the relay on the antenna in order to hear
them. I assume it's RHCP normally, and LHCP when the relay is energized.
I actually had better copy during the SSB portion than the CW, but am
not sure why
KO6TH
Date: Sat, 17 Apr 2010 16:52:37 -0500
From: pfeuff...@gmail.com
To: domenico.i8...@tin.it; amsat-bb@amsat.org
Subject: [amsat-bb] Re: Arecibo
This was my experience with a KLM 435-40CX and no preamp into a
FT-736R. I had to energize the relay on the antenna in order to hear
Hi All,
A picture is worth a thousand words.
http://sv1bsx.50webs.com/antenna-pol/polarization.html
Maybe this will help..
73, Rick WA4NVM
Subject: [amsat-bb] Re: Arecibo and circular polarization using cheap yagis
Or you can split the feedline equally if one
antenna is spaced
: Sebastian w...@bellsouth.net
Subject: [amsat-bb] Re: Arecibo
To: Mark L.Hammond marklhamm...@gmail.com
Cc: AMSAT BB AMSAT-BB@amsat.org
Message-ID: 4141f900-265d-4987-b3be-59b3834be...@bellsouth.net
Content-Type: text/plain;
charset=us-ascii
I can hear very faint CW from them.
I'm
At 08:23 AM 4/15/2010, Bob- W7LRD wrote:
Hello
Should I be so lucky as to connect with Arecib o this weekend, what
is the proper protocol for a QSO?
73 Bob W7LRD
Seattle
___
Sent via amsat...@amsat.org. Opinions expressed are those of the author.
locations at Otis Air Force Base, Massachusetts
(latitude 41°45' North, longitude 70°32' West);
--- On Thu, 4/15/10, Edward Cole kl...@acsalaska.net wrote:
From: Edward Cole kl...@acsalaska.net
Subject: [amsat-bb] Re: Arecibo
To: Bob- W7LRD w7...@comcast.net, amsat-bb@amsat.org
Date: Thursday
At 12:16 PM 4/15/2010, Douglas Quagliana wrote:
I heard Arecibo would be using circular polarization, but I haven't heard
if it will be left or right-handed circular polarization.
I also heard that there's a way to do circular polarization with the popular
cheap yagis. Apparently the details are
A quick look at the access from Europe shows that the moon is in a similar
location to the sun next weekend. So higher gain antennas on 70cm will help
reduce sun noise too.
Good luck Dom, thanks for the analysis.
73
David G0MRF
The above calculation shows that it is very difficult
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