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
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 Moon Bounce (some
--- 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
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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