Date   

Re: Pytroll/SatPy for EUMETCast

Ernst Lobsiger
 

All,
here is some first Metop-A/B/C animations of iceberg A68 heading to South Georgia. These directly run in browsers Edge and Firefox.

Cheers,
Ernst


Re: Dish elevation lever.

Ernst Lobsiger
 

Hello John

I designed such a thing for the Triax TD100 that has a very poor elevation control.
Arne van Belle redesigned it for an easy homebrew construction. Maybe that helps.

https://groups.io/g/MSG-1/message/26874

Ernst


Re: Pytroll/SatPy for EUMETCast

Ferdinand Valk
 

Ernst,

 

When I compare the 3a series with the ones from 3B at least a useful combination is possible with some remaining tracts of black. If a canvas of broken white is selected in the image creation, a movie may result that is less disturbing than flashes of black.

Must be a very special event if this huge chunk of ice meets with the island!

 

Cheers,

Ferdinand

 

From: MSG-1@groups.io On Behalf Of Ernst Lobsiger via groups.io
Sent: Sunday, 06 December, 2020 15:16
To: MSG-1@groups.io
Subject: Re: [MSG-1] Pytroll/SatPy for EUMETCast

 

On Sat, Dec 5, 2020 at 02:40 PM, Ferdinand Valk wrote:

I was thinking that maybe the combination of 3A and 3B could give sufficient coverage to make a movie, but I haven’t tried that yet.

Cheers,

Ferdinand

Ferdinand and All

Movies are possible with Metop-A/B/C and GOES-16. Sentinel-3A + Sentinel-3B hand combined will give the highest
resolution animations (OLCI has 300m IFV at SSP) but at the downside of some black corners (all 1 frame per day!).

.





Landfall of iceberg A68 to South Georgia seems to be around Christmas 2020, maybe even somewhat earlier (estimated from above images).

Cheers,
Ernst


Dish elevation lever.

geojohnt@...
 

Hello All,

Some time ago a clever user designed/constructed an add on variable length clamped 'lever' or prop at the back of the dish to minutely alter the dish elevation.
It consisted of two lengths of round metal rods with screw threading on one of their ends which screwed into the end of a 'piece of metal' with a gap in the middle so as you turned this 'joiner' it altered the length of the rods +/- and thus pushed up or pulled down the elevation of the dish minutely and rigidly.

My 1 m dish has developed a bit of slack in its elevation and needs now to be 'propped up' with a 'bracket.'
Being able to adjust this prop's length slowly with a screw system by hand would allow extremely accurate elevation.

Any ideas, please?

Regards,
John Tellick.


Re: Pytroll/SatPy for EUMETCast

Ernst Lobsiger
 

On Sat, Dec 5, 2020 at 02:40 PM, Ferdinand Valk wrote:

I was thinking that maybe the combination of 3A and 3B could give sufficient coverage to make a movie, but I haven’t tried that yet.

 

Cheers,

Ferdinand

Ferdinand and All

Movies are possible with Metop-A/B/C and GOES-16. Sentinel-3A + Sentinel-3B hand combined will give the highest
resolution animations (OLCI has 300m IFV at SSP) but at the downside of some black corners (all 1 frame per day!).

.





Landfall of iceberg A68 to South Georgia seems to be around Christmas 2020, maybe even somewhat earlier (estimated from above images).

Cheers,
Ernst


Re: Pytroll/SatPy for EUMETCast

Ferdinand Valk
 

Very nice Ernst.

I was thinking that maybe the combination of 3A and 3B could give sufficient coverage to make a movie, but I haven’t tried that yet.

 

Cheers,

Ferdinand

 

 

From: MSG-1@groups.io On Behalf Of Ernst Lobsiger via groups.io
Sent: Saturday, 05 December, 2020 19:48
To: MSG-1@groups.io
Subject: Re: [MSG-1] Pytroll/SatPy for EUMETCast

 

Ferdinand and All

After years of using SNAP 4.0 to produce all OLCI EFR images with convert I finally wrote something nice for Pytroll/Satpy and A68.
Unfortunately there is still no overlap of consecutive orbits at South Georgia. So its not possible to use Sentinel-3 to make a movie.

Cheers,
Ernst


Re: Pytroll/SatPy for EUMETCast

Graham Woolf
 

Hi Ernst

Very nice image - any chance you would share your python script :-)

Regards

Graham


Re: Pytroll/SatPy for EUMETCast

Ernst Lobsiger
 

Ferdinand and All

After years of using SNAP 4.0 to produce all OLCI EFR images with convert I finally wrote something nice for Pytroll/Satpy and A68.
Unfortunately there is still no overlap of consecutive orbits at South Georgia. So its not possible to use Sentinel-3 to make a movie.

Cheers,
Ernst


eumetcast data capture

diogenes1@...
 

Hello All, After my 1.25m dish was damaged I have replaced it with a 1m dish just a little higher up the scaffold pole. For the last few weeks I have tried and tried to receive a usable signal. I have checked cable continuity, and a number of Lnbs. The card I use is a TBS 6903 although I have tried it with an Ayecka SR1 with similar results. With both the TBS software and BDADataex I receive a 98% signal level with no quality or RF level. I appreciate that there are satellites at 16°E,13°E and 07°E however when I adjust BDADataex for each of them I still cannot get a lock. Is there anyone who has had a similar experience and can enlighten me?
Regards, Peter


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 <fppmc66@...>
 


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

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