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CX2SA > SATDIG 18.01.13 22:03l 379 Lines 10300 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V8 18
Path: IZ3LSV<IW0QNL<ON4HU<CX2SA
Sent: 130118/2002Z @:CX2SA.SAL.URY.SA #:2398 [Salto] FBB7.00e $:AMSATBB818
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: NIST Phase Noise Measurements Group Noise Figure
kTBcorrection (i8cvs)
2. Re: AMSAT-BB Digest, Vol 8, Issue 17 (Thomas Frey)
3. Re: YouTube (Joe Leikhim)
4. Grid EM21hs Contact to Europe - Possible? Let's try.
(Clayton Coleman)
5. Re: Grid EM21hs Contact to Europe - Possible? Let's try.
(ec4tr.luis)
6. PSLV-CA (PSLV-C20) Launch Feb 14 (Trevor .)
7. WARP DRiVE for STRaND-1 CubeSat (Trevor .)
8. Re: Broadband Preamps back in stock! (John / NS1Z)
----------------------------------------------------------------------
Message: 1
Date: Thu, 17 Jan 2013 21:49:23 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Joe Leikhim" <rhyolite@xxxxxxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: NIST Phase Noise Measurements Group Noise
Figure kTBcorrection
Message-ID: <000001cdf4f4$7957b0c0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Joe Leikhim" <rhyolite@xxxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Sent: Thursday, January 17, 2013 5:52 PM
Subject: [amsat-bb] NIST Phase Noise Measurements Group Noise Figure
kTBcorrection
> This came to my attention yesterday.
>
> NIST presents interesting 3 dB correction to historic value assumed
> for kTB to -177 dBm/Hz . I always assumed -174 dBm/Hz based on past
> publications.
>
> http://tf.nist.gov/phase/noisemeas.html
>
> I wonder how this affects metrology and calibration of noise figure
meters?
> --
> Joe Leikhim
> Leikhim and Associates
> Communications Consultants
> Oviedo, Florida
> JLeikhim@xxxxxxx.xxx
> 407-982-0446
> WWW.LEIKHIM.COM
>
Hi Joe,
The KTB = -174 dBm/Hz noise floor is based on
K= Boltzmann constant = 1.38 x 10^-23 joule / kelvin
T = 290 degrees kelvin as internationally stated as room
temperature by Friis
and so KTB = 1.38 x 10^-23 x 290 x 1 = 4.002^ -21 watt/Hz
10 log ( 4.002^ -21) = -203.977 dBW / Hz
10
-203.977 + 30 = -173.977 dBm/Hz (or approx -174 dBm/Hz)
Actually all Noise Sources heads of the instruments to calibrate
the value of Noise Figure NF in dB are based on Noise Excess
referred to room temperature of 290 degrees kelvin or +17?C
It comes that if KTB is changed from -174 dBm/Hz to -177 dBm/Hz
than the standard room temperature of 290 kelvin (+17?C) must be
changed to 140 kelvin ( - 133 ?C ) wich is a not practical temperature
to be managed in any measurement laboratory.
and infact:
KTB = 1.38 x 10^-23 x 140 x 1 = 1.932^ -21 watt/Hz
10 log ( 1.932^ -21) = -207.139 dBW / Hz
10
-207.139 +30 = -177.139 dBm /Hz (or approx -177 dBm/Hz )
At this point all Noise Sources heads of the instruments to
calibrate the value of Noise Figure NF in dB and Noise Excess
must be changed from 290 to 140 degrees kelvin and this will
strongly AFFECT METROLOGY AND CALIBRATION of
all noise figure meters.
If you actually have a preamplifier with a Noise Figure of 3 dB
than it's Noise Factor F = 10^ (NF/10 ) = 10^(3/10) = 1.99
If you actually want to know how many kelvin correspond a Noise
Temperature T for a Noise Factor = 1.99, than
T = (1.995 -1) x 290 = 288.62 kelvin
On the other side referring T to 140 kelvin instead of 290 kelvin
than a Noise Figure of 3 dB will correspond to a Noise Temperature
of T = (1.995 -1) x 140 = 139.33 kelvin.
Best 73" de
i8CVS Domenico
------------------------------
Message: 2
Date: Thu, 17 Jan 2013 23:03:03 +0100
From: Thomas Frey <th.frey@xxxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AMSAT-BB Digest, Vol 8, Issue 17
Message-ID: <50F87517.8070708@xxxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
amsat-bb-request@xxxxx.xxx schrieb:
> Message: 1
> Date: Wed, 16 Jan 2013 21:53:10 +0000 (GMT)
> From: "Trevor ."<m5aka@xxxxx.xx.xx>
> To:amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] PSLV-CA CubeSat Launch February 10 ?
> Message-ID:
> <1358373190.281.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
> Content-Type: text/plain; charset=utf-8
>
> The Zarya site is currently quoting February 10 as a possible launch date
for PSLV-CA which will carry a number of CubeSats some of which are listed
by Zarya.
>
> Seehttp://www.zarya.info/Calendar.php
>
> 73 Trevor M5AKA
>
Hello Trevor
The NASA Space Calendar says at 14th February, see
http://www2.jpl.nasa.gov/calendar/#1302 (PSLV-C20).
See also
http://www.amsat-dl.org/index.php/satelliten-mainmenu-76/ersicht-aller-mainmen
u-102#geplant
--
Mit freundlichen Gr?ssen, Regards, 73
Thomas Frey, HB9SKA
______________________________________________________________________
Thomas Frey, Holzgasse 2, CH-5242 Birr, Tel. + Fax: 056 444 93 41
http://home.datacomm.ch/th.frey/
------------------------------
Message: 3
Date: Thu, 17 Jan 2013 17:21:23 -0500
From: Joe Leikhim <rhyolite@xxxxxxxx.xxx>
To: Mauri Lucca <iz5ovp@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: YouTube
Message-ID: <50F87963.2010801@xxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Cute!
On 1/17/2013 4:15 PM, Mauri Lucca wrote:
>
> www.youtube.com/watch?v=ZAxUb6EPPtY
> <http://www.youtube.com/watch?v=ZAxUb6EPPtY>
>
> iz5ovp
> MauriLucca@xxxxxxx.xx <mailto:MauriLucca@xxxxxxx.xx>
> sent by mobile phone
> www.qrz.com/db/iz5ovp <http://www.qrz.com/db/iz5ovp>
>
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
JLeikhim@xxxxxxx.xxx
407-982-0446
WWW.LEIKHIM.COM
------------------------------
Message: 4
Date: Thu, 17 Jan 2013 19:48:32 -0600
From: Clayton Coleman <kayakfishtx@xxxxx.xxx>
To: AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Grid EM21hs Contact to Europe - Possible? Let's
try.
Message-ID:
<CAPovOwcyvNYucXdQPcbx3haBOFLQe0M7kGUOihm1qmOuqcs-FA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I am seeking a station located in Ireland, UK, Portugal, or the far
west coast of Spain (Ferrol, Muros, or Vigo) for an attempted contact
on AO-7 mode B.
With my current station I am confident to establish contact in the
range of 7600-7700km.
This contact may require multiple attempts. I am patient and desire
the opportunity to make contact with you. CW or voice.
My location is in the eastern region of Texas, USA.
Thank you & 73,
Clayton
W5PFG
------------------------------
Message: 5
Date: Fri, 18 Jan 2013 09:09:30 +0100
From: "ec4tr.luis" <ec4tr.luis@xxxxx.xxx>
To: Clayton Coleman <kayakfishtx@xxxxx.xxx>
Cc: AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Grid EM21hs Contact to Europe - Possible?
Let's try.
Message-ID:
<CALcq4TFR-5ZNUtf_3uoa9WVjZTiOCA4QGdaf3MY3cHbWO6gKGg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Clayton,
I think it would be possible to contact IN80er (Madrid), now I'm at work and
I can not calculate.
I'm usually active in the passes of the A0-7 A & B, between 18 and 20 UTC.
My email ec4tr.luis @ gmail.com
73's Luis
2013/1/18 Clayton Coleman <kayakfishtx@xxxxx.xxx>
> I am seeking a station located in Ireland, UK, Portugal, or the far
> west coast of Spain (Ferrol, Muros, or Vigo) for an attempted contact
> on AO-7 mode B.
>
> With my current station I am confident to establish contact in the
> range of 7600-7700km.
>
> This contact may require multiple attempts. I am patient and desire
> the opportunity to make contact with you. CW or voice.
>
> My location is in the eastern region of Texas, USA.
>
> Thank you & 73,
>
> Clayton
> W5PFG
> _______________________________________________
> 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: Fri, 18 Jan 2013 11:21:23 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] PSLV-CA (PSLV-C20) Launch Feb 14
Message-ID:
<1358508083.25716.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
The Hindu newspaper reports that ISRO are aiming for a February 14 launch
date.
See http://www.uk.amsat.org/?p=12180
73 Trevor M5AKA
AMSAT-UK http://www.amsat-uk.org/
Join or Renew your AMSAT-UK membership at
http://shop.amsat.org.uk/shop/category_7/Membership-of-AMSAT-UK.html
----
------------------------------
Message: 7
Date: Fri, 18 Jan 2013 11:53:10 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] WARP DRiVE for STRaND-1 CubeSat
Message-ID:
<1358509990.11313.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
See http://www.uk.amsat.org/?p=12191
73 Trevor M5AKA
AMSAT-UK http://www.amsat-uk.org/
Join or Renew your AMSAT-UK membership at
http://shop.amsat.org.uk/shop/category_7/Membership-of-AMSAT-UK.html
----
------------------------------
Message: 8
Date: Fri, 18 Jan 2013 12:54:29 -0500
From: "John / NS1Z" <ns1zjohn@xxxxx.xxx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Broadband Preamps back in stock!
Message-ID: <99BBAA8151624075ACC6CC19277FA7FC@xxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Ordered on Tuesday and arrived on Friday of the same week. Super service and
well built. Thanks
-----Original Message-----
From: Alan
Sent: Tuesday, January 15, 2013 10:45 AM
To: AMSAT-BB
Subject: [amsat-bb] Broadband Preamps back in stock!
The AMSAT Store now has the popular broadband preamps back in stock. They
can be found on the top page at:
http://store.amsat.org/catalog/
73s,
Alan
WA4SCA
AMSAT Store stock boy.
_______________________________________________
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 member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 8, Issue 18
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