Date   

Re: EUMETCastView and Sentinel 3A images

g3pha.morris@btinternet.com
 

Greetings Hugo from the UK and thanks for your response.
Yes, I have checked user name and password and still the same.
I have been using EUMETCastView on a regular basis for  Sentinel 3a imaging for some time
and really pleased with the quality displayed. I liked the global presentation of the pass
segments when selecting and area of interest for display, and considered a very user friendly method.  Never had any problems downloading
from the CODA site until now and the introduction of the recent web site updates --  which I find not easy to navigate around.
Will have to investigate an alternative way to get the  data I need into EUMETCastView and not to abandon this section of the programme .
Hope I don't have to do this.   In the meantime best wishes and thanks for making EUMETCastView available.   John Morris
Regards   John Morris


Re: Checking a LNB

J.W. Davies
 

You could try a technique that has been used since the early days of satellite TV.


Put a satellite signal strength meter in the coax feed to the LNB. The LNB being powered up.

Point the LNB straight up and note the reading.

Repeat but this point the LNB straight down at the ground and compare the reading with the sky pointing one.

There should be a large difference.


The reason this works is that at around 10-12GHz the sky has a noise temperature of a few degrees Kelvin and the ground has a noise temperature of around 280 degrees Kelvin.

Compare with a known good LNB, if you have one, to compare the amount of change.


The effect is surprisingly strong. I've used the effect on many occasions to test LNBs and on old analogue satellite TV receivers the AGC rail would go from one extreme to the other during the test.

How powerful a radio emitter the ground beneath a dish is often forgotten by satellite dish installers and a poorly mount or incompatible LNB feed horn/ dish assembly can result in the LNB seeing the "hot" ground and they being baffled by not being able to achieve a low noise figure even with a large dish.


I hope that is of some help


Regards

James





On 04/12/20 14:33, diogenes1 via groups.io wrote:
Hello All, I am assuming, because of the lack of replies, that the only way to check a LNB is to install it on a dish and check for a signal or not. This seems quite odd to me in this technological age that suck it and see is the only option!
Regards, Peter


Re: EUMETCastView and Sentinel 3A images

Hugo
 

Hi John,

It has been a while since I tried to download some Sentinel images via Scihub/CODA in EUMETCastView.
You can always use the interactive website of Scihub to download the files and than point to that directory in EUMETCastView.
Did you change the username and password in EUMETCastView to your credentials ? Can you log on in the interactive website https://scihub.copernicus.eu/dhus/#/home ?
I will have a look at it to see if it still works .
Kind regards,

Hugo


Re: Checking a LNB

geojohnt@...
 

Hello,

Er, yes, basically
That is the only way you are going to know if an LNB is working or not.
Provided there is not a cable and/or receiver issue.

Regards,
John.

++++++++++++++++++++

-----Original Message-----
From: diogenes1 via groups.io <diogenes1@...>
To: MSG-1@groups.io
Sent: Fri, 4 Dec 2020 14:33
Subject: Re: [MSG-1] Checking a LNB

Hello All, I am assuming, because of the lack of replies, that the only way to check a LNB is to install it on a dish and check for a signal or not. This seems quite odd to me in this technological age that suck it and see is the only option!
Regards, Peter


Re: Checking a LNB

diogenes1@...
 

Hello All, I am assuming, because of the lack of replies, that the only way to check a LNB is to install it on a dish and check for a signal or not. This seems quite odd to me in this technological age that suck it and see is the only option!
Regards, Peter


Re: Quadrifilar Helix Antenna for 137MHz

diogenes1@...
 

Thank you to all who replied to my request.
Peter


EUMETCastView and Sentinel 3A images

g3pha.morris@btinternet.com
 

For some time I have been enjoying displaying Sentinel 3A imaging using the
EUMETCastViewer programme with the data obtained from the coda.eumetsat.int  site.
These past few days I have not been able to access the data and have the message :-
   HTTP Status 401 - Full authentication is required to access this resource.
Have checked the Scihub/CODA Config settings and my settings have not changed.
I am aware that there have been, very recently,  changes to the EUMETsat web site
and their introduction may be the cause.  Is it possible I may have missed an announcement
about changes which may be needed to EUMETCastViewer settings in order to resume Sentinel 3a
imaging or is re-registration with EUMETsat now required.   Is it likely that this facility has been withdrawn perhaps ?
Any advice would be helpful and appreciated.      John Morris


Re: Quadrifilar Helix Antenna for 137MHz

ian
 

i have the diamond for sale pmed


Re: Quadrifilar Helix Antenna for 137MHz

Cornish Man
 

Hi

 

On the ATP Facebook group there’s someone that builds and sells QFH antennas

John Queen is hi name

 

Jan

 

Sent from Mail for Windows 10

 

From: Daniele Guardigli
Sent: 04 December 2020 13:01
To: MSG-1@groups.io
Subject: Re: [MSG-1] Quadrifilar Helix Antenna for 137MHz

 

 

Il Ven 4 Dic 2020, 13:52 diogenes1 via groups.io <diogenes1=tutanota.com@groups.io> ha scritto:

Hello again, Does anyone know of a U.K. commercial source for this antenna. I know that there are a number of web sites out there with instructions on how to make this antenna but for a number of reasons I need to purchase one ready made?
Regards, Peter

 


Re: Quadrifilar Helix Antenna for 137MHz

Frank Kosta
 


Hi Peter

From time to time an amateur builds and sells them here but currently there is none for sale.
I hope this helps.
Good luck.
Regards,

Frank


Virus-free. www.avg.com

diogenes1 via groups.io <diogenes1=tutanota.com@groups.io> escreveu no dia sexta, 4/12/2020 à(s) 12:52:
Hello again, Does anyone know of a U.K. commercial source for this antenna. I know that there are a number of web sites out there with instructions on how to make this antenna but for a number of reasons I need to purchase one ready made?
Regards, Peter


Virus-free. www.avg.com


Re: Quadrifilar Helix Antenna for 137MHz

Daniele Guardigli
 

Il Ven 4 Dic 2020, 13:52 diogenes1 via groups.io <diogenes1=tutanota.com@groups.io> ha scritto:
Hello again, Does anyone know of a U.K. commercial source for this antenna. I know that there are a number of web sites out there with instructions on how to make this antenna but for a number of reasons I need to purchase one ready made?
Regards, Peter


Quadrifilar Helix Antenna for 137MHz

diogenes1@...
 

Hello again, Does anyone know of a U.K. commercial source for this antenna. I know that there are a number of web sites out there with instructions on how to make this antenna but for a number of reasons I need to purchase one ready made?
Regards, Peter


Re: EUMETSAT new website.

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

On 03/12/2020 13:44, geojohnt via groups.io wrote:
David,
Twitter??
That's what birds do, isn't it. (:-))
I really must join the 21st C?
I have to say, though I didn't spend much time on the website, that although it looked rather classy, I couldn't find what I wanted as quickly as before.
Well, I didn't find it.
"Too much 'information'" (text) to plough through.
Regards,
John.
As both EUMETSAT and ESA are regular posters on Twitter I recommend you join. You can simply "follow" those you wish to. More info:

https://help.twitter.com/en/using-twitter/create-twitter-account

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv


Re: Pytroll/SatPy for EUMETCast

Ferdinand Valk
 

Latest add-on: both South Georgia and A68 in a single image (Sentinel 3A today). Separated by only 1,5x the width of the island.

 


Re: Pytroll/SatPy for EUMETCast

Ferdinand Valk
 

Ernst,

 

Looking again more attentively I think you are right, as also the coloration (blueish vs. white) neatly follows the contour of the cloud.

Well spotted!

 

Cheers,

Ferdinand

 

From: MSG-1@groups.io On Behalf Of Ernst Lobsiger via groups.io
Sent: Thursday, 03 December, 2020 12:26
To: MSG-1@groups.io
Subject: Re: [MSG-1] Pytroll/SatPy for EUMETCast

 

Ferdinand,

that's a very nice image. I wonder if the structures we see on the ice is not copied from the thin cloud overhead (see gray cloud lower left of A-68a).
Unfortunately Sentinel 3A/3B have repeat cicles of 27 days, so the last picture of this quality should be from November 5th. And *YES*, here it is!

Cheers,
Ernst


Re: Eumetcast - SatPy Problem: "No IMPF configuration field found in prologue" [SOLVED]

Francis Greaves
 

Ernst, THANK YOU once again for a useful clue!
I have looked again at the problem.
I have discovered that it is nothing to do with the No IMPF configuration field found in prologue warning. it is a problem with loading the BlackMarble file.
Setting up a simple script I discovered this error being output:
Don't know how to open the following files: {'/home/francis/FG-Docs/Downloads/BlackMarble_Images/BlackMarble_2016_01deg_geo.tif'}
So enabling the satpy debug and looking again at the output I found the answer:
SatPy could not open the BlackMarble tiff file because the rasterio module was not installed. Once I installed that, the image was created.
Problem Solved!


Re: Signal quality

Giftmacher
 

I have the LNB you mentioned. So you think the signal quality I have correspond with the dish size?


Re: EUMETSAT new website.

geojohnt@...
 

David,

Twitter??
That's what birds do, isn't it. (:-))

I really must join the 21st C?

I have to say, though I didn't spend much time on the website, that although it looked rather classy, I couldn't find what I wanted as quickly as before.
Well, I didn't find it.

"Too much 'information'" (text) to plough through.

Regards,
John.

+++++++++++++++++++

Yes.  Did you not follow the user invite to test which was on Twitter?

Sadly, it's broken many of the links, including links found by Google. 
It makes it more difficult to help folks when you know the information 
is there, but it can't be found.

Cheers,
David
-- 
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


-----Original Message-----
From: David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺 via groups.io <david-taylor@...>
To: MSG-1@groups.io
Sent: Thu, 3 Dec 2020 11:10
Subject: Re: [MSG-1] EUMETSAT new website.

On 03/12/2020 10:07, geojohnt via groups.io wrote:

> All,
>
> Gosh, have you seen the newly revamped EUMETSAT website?
>
> Regards,
> John Tellick.







Re: Signal quality

Ernst Lobsiger
 

Giftmacher

A 85cm dish is about the bare minimum for acceptable Basic Service and maybe some HVS-1.
I recommend a 110cm -125cm dish and the Inverto Black Ultra HGLN LNB that many of us use.

Ernst


Signal quality

Giftmacher
 

Hi again, I was tinkering with antenna yesterday and SNR increased from 10.8 to max.11.8-12, but I
think the quality of 58% is still low, should it be better on a 85cm dish? Could that cause the problem I'm experiencing?

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