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Groups > sci.physics.relativity > #460331 > unrolled thread
| Started by | numbernumber1964@gmail.com |
|---|---|
| First post | 2018-06-04 15:44 -0700 |
| Last post | 2018-06-22 16:12 -0700 |
| Articles | 20 on this page of 187 — 21 participants |
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Apollo 11 numbernumber1964@gmail.com - 2018-06-04 15:44 -0700
Re: Apollo 11 Vaughn Fleck <guah@nhnw.nc> - 2018-06-04 23:09 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-04 19:58 -0700
Re: Apollo 11 intuitionist1@gmail.com - 2018-06-06 08:26 -0700
Re: Apollo 11 Zandra Sobczak <acako@raswa.bo> - 2018-06-06 16:03 +0000
Re: Apollo 11 dlzc <dlzc1@cox.net> - 2018-06-06 09:13 -0700
Re: Apollo 11 Zandra Sobczak <acako@raswa.bo> - 2018-06-06 17:05 +0000
Re: Apollo 11 intuitionist1@gmail.com - 2018-06-06 11:53 -0700
Re: Apollo 11 Zandra Sobczak <acako@raswa.bo> - 2018-06-06 20:09 +0000
Re: Apollo 11 intuitionist1@gmail.com - 2018-06-07 06:06 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-07 07:35 -0700
Re: Apollo 11 intuitionist1@gmail.com - 2018-06-08 05:56 -0700
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-08 12:53 -0700
Re: Apollo 11 intuitionist1@gmail.com - 2018-06-09 15:36 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-07 10:12 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-07 17:39 +0000
Re: Apollo 11 Volney <volney@volney.invalid> - 2018-06-07 13:40 -0400
Re: Apollo 11 Paparios <mrios@ing.puc.cl> - 2018-06-07 10:46 -0700
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-07 13:29 -0700
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-07 13:23 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-08 08:36 -0700
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-08 12:56 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-07 12:17 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-07 20:57 +0000
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-07 12:19 -0700
Re: Apollo 11 Volney <volney@volney.invalid> - 2018-06-07 15:47 -0400
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-07 12:22 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-07 12:51 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-07 12:54 -0700
Re: Apollo 11 Paparios <mrios@ing.puc.cl> - 2018-06-07 14:47 -0700
Re: Apollo 11 Zandra Sobczak <acako@raswa.bo> - 2018-06-08 17:03 +0000
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-08 09:40 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-08 09:41 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-08 17:00 +0000
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-08 09:45 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-08 22:06 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-08 10:37 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-08 17:48 +0000
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-08 12:59 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-08 12:29 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-08 20:54 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-08 22:14 -0700
Re: Apollo 11 Zandra Sobczak <acako@raswa.bo> - 2018-06-09 15:10 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-10 22:15 -0700
Re: Apollo 11 Zandra Sobczak <acako@raswa.bo> - 2018-06-12 18:38 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-16 16:33 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-16 21:33 -0700
Re: Apollo 11 Werner Ballard <db@ocoak.bn> - 2018-06-17 11:36 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-17 10:29 -0700
Re: Apollo 11 John Gogo <jfgogo22@yahoo.com> - 2018-06-20 18:08 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-08 12:29 -0700
Re: Apollo 11 Paparios <mrios@ing.puc.cl> - 2018-06-08 15:26 -0700
Re: Apollo 11 Zandra Sobczak <acako@raswa.bo> - 2018-06-09 15:13 +0000
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-10 17:26 -0700
Re: Apollo 11 Paparios <mrios@ing.puc.cl> - 2018-06-10 17:41 -0700
Re: Apollo 11 Zandra Sobczak <acako@raswa.bo> - 2018-06-12 18:50 +0000
Re: Apollo 11 Zandra Sobczak <acako@raswa.bo> - 2018-06-12 18:48 +0000
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-13 09:27 -0700
Re: Apollo 11 Pasquale Broman <lqs@basq.ce> - 2018-06-13 20:36 +0000
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-11 09:21 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-11 16:36 +0000
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-11 09:23 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-11 09:25 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-11 16:36 +0000
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-11 09:27 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-11 09:34 -0700
Re: Apollo 11 Paparios <mrios@ing.puc.cl> - 2018-06-11 10:37 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-11 09:40 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-11 16:56 +0000
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-11 09:42 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-11 16:56 +0000
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-11 12:23 -0700
Re: Apollo 11 Paparios <mrios@ing.puc.cl> - 2018-06-11 14:45 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-11 12:25 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-11 19:57 +0000
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-11 12:50 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-11 12:51 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-11 12:55 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-11 13:29 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-11 20:45 +0000
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-11 13:36 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-11 20:49 +0000
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-11 14:31 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-11 15:00 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-12 09:35 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-12 09:36 -0700
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-13 09:17 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-13 19:47 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-12 09:37 -0700
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-13 09:19 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-12 13:50 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-12 22:06 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-12 15:45 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-12 15:29 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-12 23:21 +0000
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-12 15:55 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-12 15:58 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-12 17:09 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-12 17:12 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-13 00:50 +0000
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-13 09:31 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-12 17:15 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-12 17:20 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-12 19:03 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-12 18:17 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-12 20:17 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-13 11:02 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-13 20:07 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-13 11:03 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-13 11:05 -0700
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-14 07:02 -0700
Re: Apollo 11 Werner Ballard <db@ocowak.br> - 2018-06-14 15:58 +0000
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-14 11:01 -0700
Re: Apollo 11 Werner Ballard <db@ocoak.bn> - 2018-06-14 21:10 +0000
Re: Apollo 11 Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-14 23:39 +0200
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-15 08:48 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-13 13:44 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-14 11:19 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-14 16:55 -0700
Re: Apollo 11 Tom Roberts <tjroberts137@sbcglobal.net> - 2018-06-14 19:21 -0500
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-14 17:31 -0700
Re: Apollo 11 Tom Roberts <tjroberts137@sbcglobal.net> - 2018-06-15 11:58 -0500
Re: Apollo 11 Paparios <mrios@ing.puc.cl> - 2018-06-14 18:23 -0700
Re: Apollo 11 Volney <volney@volney.invalid> - 2018-06-14 22:48 -0400
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-14 22:23 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-14 22:25 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-14 11:22 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-14 11:29 -0700
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-15 08:45 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-14 13:36 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-14 15:45 -0700
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-15 08:50 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-14 17:13 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-14 17:46 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-14 17:21 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-14 17:28 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-15 11:24 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-15 12:42 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-15 13:26 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-15 12:54 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-15 13:21 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-15 13:29 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-15 13:36 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-15 14:30 -0700
Re: Apollo 11 Werner Ballard <db@ocoak.bn> - 2018-06-16 14:51 +0000
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-18 14:53 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-18 21:11 -0700
Re: Apollo 11 Zprávn Udoucih <zpnvn@nwinst.ce> - 2018-06-19 17:55 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-19 16:25 -0700
Re: Apollo 11 Zprávn Udoucih <zpnvn@nwinst.ce> - 2018-06-20 10:37 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-20 15:33 -0700
Re: Apollo 11 Oren Woodcock <uw@osiweoq.lp> - 2018-06-29 23:04 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-29 20:26 -0700
Re: Apollo 11 Oren Woodcock <uw@osiweoq.lp> - 2018-06-30 13:08 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-30 18:33 -0700
Re: Apollo 11 Volney <volney@volney.invalid> - 2018-06-30 22:00 -0400
Re: Apollo 11 Oren Woodcock <uw@osiweoq.lp> - 2018-07-01 10:57 +0000
Re: Apollo 11 Oren Woodcock <uw@osiweoq.lp> - 2018-07-01 11:00 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-20 20:39 -0700
Re: Apollo 11 Oren Woodcock <uw@woswiw.lw> - 2018-06-27 10:51 +0000
Re: Apollo 11 Edward Prochak <edprochak@gmail.com> - 2018-06-27 11:35 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-27 14:18 -0700
Re: Apollo 11 Oren Woodcock <uw@woswiw.lw> - 2018-06-28 09:09 +0000
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-18 15:05 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-18 21:12 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-19 14:17 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-19 22:44 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-19 16:29 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-19 16:37 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-19 19:39 -0700
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-19 15:53 -0700
Re: Apollo 11 Odd Bodkin <bodkinodd@gmail.com> - 2018-06-19 23:21 +0000
Re: Apollo 11 furthermore7990662@gmail.com - 2018-06-19 15:58 -0700
Re: Apollo 11 Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-20 07:31 +0200
Re: Apollo 11 Tom Roberts <tjroberts137@sbcglobal.net> - 2018-06-20 09:31 -0500
Re: Apollo 11 Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-20 19:21 +0200
Re: Apollo 11 Zprávn Udoucih <zpnvn@nwinst.ce> - 2018-06-20 18:37 +0000
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-20 15:35 -0700
Re: Apollo 11 carleto4157990662@gmail.com - 2018-06-19 16:47 -0700
Re: Apollo 11 carleto4157990662@gmail.com - 2018-06-19 16:50 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-19 19:42 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-20 08:57 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-20 15:40 -0700
Re: Apollo 11 numbernumber1964@gmail.com - 2018-06-21 09:48 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-21 13:21 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-22 06:08 -0700
Re: Apollo 11 Steve BH <sbharris@gmail.com> - 2018-06-22 16:12 -0700
Page 8 of 10 — ← Prev page 1 … 6 7 [8] 9 10 Next page →
| From | Steve BH <sbharris@gmail.com> |
|---|---|
| Date | 2018-06-15 13:21 -0700 |
| Message-ID | <dd1ead00-2b41-4e1e-8b75-8176ef24625e@googlegroups.com> |
| In reply to | #461399 |
That’s because the answer isn’t in watts. It’s in watts per square meter per Hz.
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| From | Steve BH <sbharris@gmail.com> |
|---|---|
| Date | 2018-06-15 13:29 -0700 |
| Message-ID | <e0212bdd-ed57-4c52-8f5a-37b007c15463@googlegroups.com> |
| In reply to | #461399 |
http://www.atnf.csiro.au/people/Keith.Bannister/senscalc/ Calculate it yourself. The SEFD is how much signal doubles detector temp. It is intensity per degree in Janskys (Jy). One Jy is 10^-26 J/m^2/Hz.
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| From | furthermore7990662@gmail.com |
|---|---|
| Date | 2018-06-15 13:36 -0700 |
| Message-ID | <70b42b87-c03a-46ba-a1c4-0b9ad76f51d6@googlegroups.com> |
| In reply to | #460331 |
That’s because the answer isn’t in watts.. It’s in watts per square meter per Hz.. _____________________________________________________ But the power output is in Watt/m^2. I forgot where I got that from though. The power units.
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| From | Steve BH <sbharris@gmail.com> |
|---|---|
| Date | 2018-06-15 14:30 -0700 |
| Message-ID | <bbfd36b1-3e90-4ea3-a42f-d7b7fdd7cc47@googlegroups.com> |
| In reply to | #461408 |
You asked for sensitivity of a radio telescope, which is degraded by detector temperature (which contributes to noise). So you must specify temp of detector and frequency of signal to be detected.
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| From | Werner Ballard <db@ocoak.bn> |
|---|---|
| Date | 2018-06-16 14:51 +0000 |
| Message-ID | <pg385r$ena$1@gioia.aioe.org> |
| In reply to | #461410 |
Steve BH wrote: > You asked for sensitivity of a radio telescope, which is degraded by > detector temperature (which contributes to noise). So you must specify > temp of detector and frequency of signal to be detected. No, that's general, and cannot be avoided. You have to find a region and be ready for compromises. An antenna is just a low noise amplifier.
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| From | numbernumber1964@gmail.com |
|---|---|
| Date | 2018-06-18 14:53 -0700 |
| Message-ID | <af33e704-e5d5-4de3-9bef-d232f81e812f@googlegroups.com> |
| In reply to | #460331 |
Calculate it yourself. The SEFD is how much signal doubles detector temp.. It is intensity per degree in Janskys (Jy). One Jy is 10^-26 J/m^2/Hz.. ________________________________________________ What is the sensitivity for a 2 Ghz radio signal? Also, what is the power of a 2 Ghz mobile phone. Say 3 miles from the radio telescope?
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| From | Steve BH <sbharris@gmail.com> |
|---|---|
| Date | 2018-06-18 21:11 -0700 |
| Message-ID | <a13db689-282e-49dc-bc87-62bc8530a92f@googlegroups.com> |
| In reply to | #461657 |
On Monday, June 18, 2018 at 2:53:34 PM UTC-7, numbernu...@gmail.com wrote:
> Calculate it yourself. The SEFD is how much signal doubles detector temp.. It is intensity per degree in Janskys (Jy). One Jy is 10^-26 J/m^2/Hz..
>
> ________________________________________________
>
>
> What is the sensitivity for a 2 Ghz radio signal? Also, what is the power of a 2 Ghz mobile phone. Say 3 miles from the radio telescope?
It's better to say how much better a radiotelesope dish is from a simple dipole detector on a cell tower.
The biggest dish used during Apollo 11 was the 210 foot military dish in the US, which NASA used during landing. Which was good because for some seconds the rotation of the LM during landing lost them their directional antenna lock (from the LM-- this is a hand cranked device at the edge of the LM with a gain of 20 dB = factor of 100, but it has to be pointed at Earth) and in the gaps they were operating on one 15 watt S-band omnidirectional transmitter on the LM picked up by a 210 foot dish on the ground. The frequency was 1.3 GHz. Had they lost telemetry altogether they would have had to abort the landing, and the 85 foot dishes were not up the job when the LM high gain went out.
1.3 GHz is 23 cm = 0.75 feet.
Large antenna gain = {4pi[210 feet/0.75]}^2 times antenna factor (usually about 0.5) = 6.2 x 10^6 = 68 dB
You get further distance from the LM tranmitter working nominally at 15 watts RF output vs. a mobile phone at only 3 watts max. So 10 log [15/3] = 7 dB.
Okay, the total you get from the big dish and LM bigger transmitter is 68 + 7 dB = 75 dB. Are you paying attention? This increases your distance of pickup by 6 dB per doubling of distance, or 2^[75/6] = 58,000.
So there you are. If you can get a link with your cell phone 5 miles from your cell tower, the extra factor of 58,000 in distance from a big dish and a bit more power gets you all the way to the Moon.
If you want to read about the actually com system for the Apollo program you can do it:
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720012253.pdf
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720023255.pdf
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| From | Zprávn Udoucih <zpnvn@nwinst.ce> |
|---|---|
| Date | 2018-06-19 17:55 +0000 |
| Message-ID | <pgbg38$18h$1@gioia.aioe.org> |
| In reply to | #461689 |
Steve BH wrote: > On Monday, June 18, 2018 at 2:53:34 PM UTC-7, numbernu...@gmail.com > wrote: >> Calculate it yourself. The SEFD is how much signal doubles detector >> temp.. It is intensity per degree in Janskys (Jy). One Jy is 10^-26 >> J/m^2/Hz.. >> What is the sensitivity for a 2 Ghz radio signal? Also, what is the >> power of a 2 Ghz mobile phone. Say 3 miles from the radio telescope? > > It's better to say how much better a radiotelesope dish is from a simple > dipole detector on a cell tower. > The biggest dish used during Apollo 11 was the 210 foot military dish in > the US, which NASA used during landing. Which was good because for some > seconds the rotation of the LM during landing lost them their > directional Dish parabola antennas are focusing the power in near proximity, that's why are used in reception, not transmission. Those stupid umbrellas in the pictures indicated the moon landing was fake. Buy a brain.
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| From | Steve BH <sbharris@gmail.com> |
|---|---|
| Date | 2018-06-19 16:25 -0700 |
| Message-ID | <4ab2e80b-c612-4996-be4c-df5c4d17935f@googlegroups.com> |
| In reply to | #461722 |
On Tuesday, June 19, 2018 at 10:55:57 AM UTC-7, Zprávn Udoucih wrote: > Steve BH wrote: > > > On Monday, June 18, 2018 at 2:53:34 PM UTC-7, numbernu...@gmail.com > > wrote: > >> Calculate it yourself. The SEFD is how much signal doubles detector > >> temp.. It is intensity per degree in Janskys (Jy). One Jy is 10^-26 > >> J/m^2/Hz.. > >> What is the sensitivity for a 2 Ghz radio signal? Also, what is the > >> power of a 2 Ghz mobile phone. Say 3 miles from the radio telescope? > > > > It's better to say how much better a radiotelesope dish is from a simple > > dipole detector on a cell tower. > > The biggest dish used during Apollo 11 was the 210 foot military dish in > > the US, which NASA used during landing. Which was good because for some > > seconds the rotation of the LM during landing lost them their > > directional > > Dish parabola antennas are focusing the power in near proximity, that's > why are used in reception, not transmission. Those stupid umbrellas in the > pictures indicated the moon landing was fake. Buy a brain. Buy a library card, nymshifting troll. Lookup "reciprocity antenna theorum". An antenna works the same both ways (recieve or transmit), just like your flashlight or headlight does. I'll never convince you, who have no math. But I proved that a 210 foot dish, which as a gain of 62 million = 68 dB at 1.3 GHz can make a 15 watt omnidirectional transmitter on the Moon look like a 3 watt cell phone 4 to 5 miles away. If you used 3 GHz the gain rises to 75 dB and now 3 watts on the Moon gives the same signal as a 3 watt cell phone 4 miles away. You could easily pick up a cell phone on the Moon, particularly since cell-->tower distance are typically 22 to 45 miles, not 3 miles. If you cell tower picks up 3 watt 3 GHz cell phones 21 miles away, that's 7 times farther than 3, which means your dish can be 210/7 = 30 feet. That's not that big. All this assumes NO directional antenna on the moon. With the LM directional you get a boost of 100 times in the signal, which means your dish diameter can shrink by a factor of 10. Now you can hear the Moon with just a 3 foot dish.
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| From | Zprávn Udoucih <zpnvn@nwinst.ce> |
|---|---|
| Date | 2018-06-20 10:37 +0000 |
| Message-ID | <pgdaol$thb$1@gioia.aioe.org> |
| In reply to | #461774 |
Steve BH wrote: >> Dish parabola antennas are focusing the power in near proximity, that's >> why are used in reception, not transmission. Those stupid umbrellas in >> the pictures indicated the moon landing was fake. Buy a brain. > > Buy a library card, nymshifting troll. Lookup "reciprocity antenna > theorum". An antenna works the same both ways (recieve or transmit), > just like your flashlight or headlight does. You just display your ignorance and a severe lack of proper education. You are a proven imbecile, an wikipedia freak, a library card owner. A "self- taught" cretin, an the above may serves as proof.
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| From | Steve BH <sbharris@gmail.com> |
|---|---|
| Date | 2018-06-20 15:33 -0700 |
| Message-ID | <808539aa-6a5f-4dba-bf7e-c8aa279c029f@googlegroups.com> |
| In reply to | #461812 |
On Wednesday, June 20, 2018 at 3:37:13 AM UTC-7, Zprávn Udoucih wrote: > Steve BH wrote: > > >> Dish parabola antennas are focusing the power in near proximity, that's > >> why are used in reception, not transmission. Those stupid umbrellas in > >> the pictures indicated the moon landing was fake. Buy a brain. > > > > Buy a library card, nymshifting troll. Lookup "reciprocity antenna > > theorum". An antenna works the same both ways (recieve or transmit), > > just like your flashlight or headlight does. > > You just display your ignorance and a severe lack of proper education. You > are a proven imbecile, an wikipedia freak, a library card owner. A "self- > taught" cretin, an the above may serves as proof. Besides NASA three international space agencies have explored asteroids (much farther than the Moon): CNSA (China), ESA (Europe) and JAXA (Japan). USSR got pictures back from Venus and a number of probes, and even a brief single from their problem to Mars (Mars 3-- the Soviets have a Mars curse). The ESA even built the Huygens Titan lander which relied for a photos from the surface of Titan on relay from Cassini in Orbit. Looks like most of mankind (not just NASA) is in on the "plot" to say radio waves can't go farther than the Moon. For not only are 5 major space-faring national entities in on the plot (far more of you count European countries) but also antenna-theory students at hundreds of universities. My lack of a proper education, you say? And were was your EE antenna theory class? And how is the entire globe and their various space programs and EE radio engineers fooled? The Chinese landed a Lunar Rover, just as example. Maybe it wound up on Giligan's Island and they didn't realize it.
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| From | Oren Woodcock <uw@osiweoq.lp> |
|---|---|
| Date | 2018-06-29 23:04 +0000 |
| Message-ID | <ph6dt1$1e20$3@gioia.aioe.org> |
| In reply to | #461936 |
Steve BH wrote: > My lack of a proper education, you say? And were was your EE antenna > theory class? And how is the entire globe and their various space > programs and EE radio engineers fooled? The Chinese landed a Lunar > Rover, just as example. Maybe it wound up on Giligan's Island and they > didn't realize it. As I can read, the thread is about the mirror on the moon vs parabolic antennas in focusing the power of the signal reflected by them. "Antenna theory" is merely related to the cable guys. In academia it starts with "HF theory.." and something like that.
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| From | Steve BH <sbharris@gmail.com> |
|---|---|
| Date | 2018-06-29 20:26 -0700 |
| Message-ID | <2d427b81-1515-465d-852d-82ea6178711a@googlegroups.com> |
| In reply to | #463010 |
On Friday, June 29, 2018 at 4:04:05 PM UTC-7, Oren Woodcock wrote: > Steve BH wrote: > > > My lack of a proper education, you say? And were was your EE antenna > > theory class? And how is the entire globe and their various space > > programs and EE radio engineers fooled? The Chinese landed a Lunar > > Rover, just as example. Maybe it wound up on Giligan's Island and they > > didn't realize it. > > As I can read, the thread is about the mirror on the moon vs parabolic > antennas in focusing the power of the signal reflected by them. "Antenna > theory" is merely related to the cable guys. In academia it starts with > "HF theory.." and something like that. In academia, antenna theory will be part of your EE radio design class. I"m sure you can get some version less useful and practical in a physics class. Cable guys install cable. Antenna theory is used by any engineer in free space communications, including all those working with satellites and the deep space network.
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| From | Oren Woodcock <uw@osiweoq.lp> |
|---|---|
| Date | 2018-06-30 13:08 +0000 |
| Message-ID | <ph7vcm$5jq$1@gioia.aioe.org> |
| In reply to | #463029 |
Steve BH wrote: > On Friday, June 29, 2018 at 4:04:05 PM UTC-7, Oren Woodcock wrote: >> Steve BH wrote: >> >> > My lack of a proper education, you say? And were was your EE antenna >> > theory class? And how is the entire globe and their various space >> > programs and EE radio engineers fooled? The Chinese landed a Lunar >> > Rover, just as example. Maybe it wound up on Giligan's Island and >> > they didn't realize it. >> >> As I can read, the thread is about the mirror on the moon vs parabolic >> antennas in focusing the power of the signal reflected by them. >> "Antenna theory" is merely related to the cable guys. In academia it >> starts with "HF theory.." and something like that. > > In academia, antenna theory will be part of your EE radio design class. > I"m sure you can get some version less useful and practical in a physics > class. > Cable guys install cable. Antenna theory is used by any engineer in free > space communications, including all those working with satellites and > the deep space network. You just gave another proof on your incompetencies and lack of education. You don't even know what is all about in universities. Nor in industry. And what a cable guy has to deal with. You have to be extreme unemployable, due to the above reasons. Judging on what you wrote, of course.
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| From | Steve BH <sbharris@gmail.com> |
|---|---|
| Date | 2018-06-30 18:33 -0700 |
| Message-ID | <7ed8089d-b1fe-44e8-bb91-d4ad5eaa6e90@googlegroups.com> |
| In reply to | #463049 |
On Saturday, June 30, 2018 at 6:08:43 AM UTC-7, Oren Woodcock wrote: > Steve BH wrote: > > > On Friday, June 29, 2018 at 4:04:05 PM UTC-7, Oren Woodcock wrote: > >> Steve BH wrote: > >> > >> > My lack of a proper education, you say? And were was your EE antenna > >> > theory class? And how is the entire globe and their various space > >> > programs and EE radio engineers fooled? The Chinese landed a Lunar > >> > Rover, just as example. Maybe it wound up on Giligan's Island and > >> > they didn't realize it. > >> > >> As I can read, the thread is about the mirror on the moon vs parabolic > >> antennas in focusing the power of the signal reflected by them. > >> "Antenna theory" is merely related to the cable guys. In academia it > >> starts with "HF theory.." and something like that. > > > > In academia, antenna theory will be part of your EE radio design class. > > I"m sure you can get some version less useful and practical in a physics > > class. > > Cable guys install cable. Antenna theory is used by any engineer in free > > space communications, including all those working with satellites and > > the deep space network. > > You just gave another proof on your incompetencies and lack of education. > You don't even know what is all about in universities. Nor in industry. > And what a cable guy has to deal with. You have to be extreme > unemployable, due to the above reasons. Judging on what you wrote, of > course. If you're looking for a fight, bugger off. I have an advanced degree, a nice job, and a 401(k). We've been discussing whether radio communications with the Moon and space probes beyond the Moon is possible. SO far, you have added zip to the discussion. Other people here have discussed actual Apollo equipment (antennas, power, frequencies used), link budgets to the Moon in dB, and so on. You have put in nothing. You got anything substantive to say? Say it.
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| From | Volney <volney@volney.invalid> |
|---|---|
| Date | 2018-06-30 22:00 -0400 |
| Message-ID | <ph9cia$16f$1@dont-email.me> |
| In reply to | #463130 |
On 6/30/2018 9:33 PM, Steve BH wrote: > On Saturday, June 30, 2018 at 6:08:43 AM UTC-7, Oren Woodcock wrote: >> Steve BH wrote: >> >>> On Friday, June 29, 2018 at 4:04:05 PM UTC-7, Oren Woodcock wrote: >>>> Steve BH wrote: >>>> >>>>> My lack of a proper education, you say? And were was your EE antenna >>>>> theory class? And how is the entire globe and their various space >>>>> programs and EE radio engineers fooled? The Chinese landed a Lunar >>>>> Rover, just as example. Maybe it wound up on Giligan's Island and >>>>> they didn't realize it. >>>> >>>> As I can read, the thread is about the mirror on the moon vs parabolic >>>> antennas in focusing the power of the signal reflected by them. >>>> "Antenna theory" is merely related to the cable guys. In academia it >>>> starts with "HF theory.." and something like that. >>> >>> In academia, antenna theory will be part of your EE radio design class. >>> I"m sure you can get some version less useful and practical in a physics >>> class. >>> Cable guys install cable. Antenna theory is used by any engineer in free >>> space communications, including all those working with satellites and >>> the deep space network. >> >> You just gave another proof on your incompetencies and lack of education. >> You don't even know what is all about in universities. Nor in industry. >> And what a cable guy has to deal with. You have to be extreme >> unemployable, due to the above reasons. Judging on what you wrote, of >> course. > > If you're looking for a fight, bugger off. I have an advanced degree, a nice job, and a 401(k). You're wasting your time, arguing with the nymshifter troll. Emphasis on the word 'troll'. Don't let him sucker you into the argument again once he shifts nyms again and you think he's someone new.
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| From | Oren Woodcock <uw@osiweoq.lp> |
|---|---|
| Date | 2018-07-01 10:57 +0000 |
| Message-ID | <phac27$1nup$1@gioia.aioe.org> |
| In reply to | #463132 |
extreme crank Volney wrote: >>> You just gave another proof on your incompetencies and lack of >>> education. >>> You don't even know what is all about in universities. Nor in >>> industry. >>> And what a cable guy has to deal with. You have to be extreme >>> unemployable, due to the above reasons. Judging on what you wrote, of >>> course. >> >> If you're looking for a fight, bugger off. I have an advanced degree, a >> nice job, and a 401(k). > > You're wasting your time, arguing with the nymshifter troll. Emphasis on > the word 'troll'. Don't let him sucker you into the argument again once > he shifts nyms again and you think he's someone new. What arguing, you stupid troll. Your dear friend lack understanding the elementary in HF, antennas and data communications. You both are stupid like a door. Now piss off, both of you.
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| From | Oren Woodcock <uw@osiweoq.lp> |
|---|---|
| Date | 2018-07-01 11:00 +0000 |
| Message-ID | <phac96$1nup$2@gioia.aioe.org> |
| In reply to | #463130 |
Steve BH wrote: >> You just gave another proof on your incompetencies and lack of >> education. >> You don't even know what is all about in universities. Nor in industry. >> And what a cable guy has to deal with. You have to be extreme >> unemployable, due to the above reasons. Judging on what you wrote, of >> course. > > If you're looking for a fight, bugger off. I have an advanced degree, a > nice job, and a 401(k). I doubt it strongly. You are a liar too. It's obvious that you lack education to a vast extent. > We've been discussing whether radio communications with the Moon and > space probes beyond the Moon is possible. SO far, you have added zip to > the discussion. Other people here have discussed actual Apollo equipment > (antennas, power, frequencies used), link budgets to the Moon in dB, and > so on. You have put in nothing. You got anything substantive to say? Say > it. Who said communication is not possible, lying bitch. But not the way you think it is. Admit it, you and your dear friend, troll "Volney" are idiots.
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| From | Steve BH <sbharris@gmail.com> |
|---|---|
| Date | 2018-06-20 20:39 -0700 |
| Message-ID | <e4f85701-5267-4c91-9ca7-abab3584152c@googlegroups.com> |
| In reply to | #461722 |
On Tuesday, June 19, 2018 at 10:55:57 AM UTC-7, Zprávn Udoucih wrote: > Steve BH wrote: > > > On Monday, June 18, 2018 at 2:53:34 PM UTC-7, numbernu...@gmail.com > > wrote: > >> Calculate it yourself. The SEFD is how much signal doubles detector > >> temp.. It is intensity per degree in Janskys (Jy). One Jy is 10^-26 > >> J/m^2/Hz.. > >> What is the sensitivity for a 2 Ghz radio signal? Also, what is the > >> power of a 2 Ghz mobile phone. Say 3 miles from the radio telescope? > > > > It's better to say how much better a radiotelesope dish is from a simple > > dipole detector on a cell tower. > > The biggest dish used during Apollo 11 was the 210 foot military dish in > > the US, which NASA used during landing. Which was good because for some > > seconds the rotation of the LM during landing lost them their > > directional > > Dish parabola antennas are focusing the power in near proximity, that's > why are used in reception, not transmission. Those stupid umbrellas in the > pictures indicated the moon landing was fake. Buy a brain. It's those Commies doing missions at other planets instead of exposing the West's fakes, who need to buy a brain. I guess they decided on fakes of their own. https://en.wikipedia.org/wiki/Vega_program
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| From | Oren Woodcock <uw@woswiw.lw> |
|---|---|
| Date | 2018-06-27 10:51 +0000 |
| Message-ID | <pgvq7o$dkh$3@gioia.aioe.org> |
| In reply to | #461963 |
Steve BH wrote: >> > It's better to say how much better a radiotelesope dish is from a >> > simple dipole detector on a cell tower. >> > The biggest dish used during Apollo 11 was the 210 foot military dish >> > in the US, which NASA used during landing. Which was good because for >> > some seconds the rotation of the LM during landing lost them their >> > directional >> >> Dish parabola antennas are focusing the power in near proximity, that's >> why are used in reception, not transmission. Those stupid umbrellas in >> the pictures indicated the moon landing was fake. Buy a brain. > > It's those Commies doing missions at other planets instead of exposing > the West's fakes, who need to buy a brain. I guess they decided on fakes > of their own. https://en.wikipedia.org/wiki/Vega_program Apparently "those commies" are in front of everything. You are babbling.
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