they are two different aspects. Some commercial satellite TV receivers leave the LNB always powered because even in standby mode they receive from the provider a new channel list, a new firmware etc. In any case, not for reasons of stability. A few kHz drift does not affect the reception of TV channels.
For our use, leaving the LNB always powered is aimed at system stability. Yes, in our case it is certainly useful to leave the LNB always powered.
It appears that a SSTV store and forward system is active on the ISS. I wrote something on Twitter but I didn't get an answer.
A few days ago I left a system to automatically receive SSTV signals from the ISS.
During the Inter-MAI-75 activity the signal was modulated with low index and the image quality was poor.
With the second event dedicated to W5LFL, the transmissions are good again with excellent images received.
Here the surprise; together with the images of the event I also received images that were not related to the commemoration. In doing an Internet search, I discovered this supposed Store and forward system. Has anyone received strange images like this from the ISS?
I would like to add some links to those reported by Peter, DB2OS.
DSLWP Radio Info and Successful Configurations (At the bottom of the page)
Stations that have received and sent GMSK to the server
SSDV Chinese Album page with complete information of each image received.
These are my last blocks received yesterday before the impact of DSLWP-B on the moon. A block of JT4G and a GMSK frame. For a number of reasons it was the most complicated day with DSLWP-B. Problems with the preamplifier, problems with the mobile Internet connection, problems with the new SDR dongle. Everything seemed to be going wrong but still happy to have received the satellite before the end. It was a beautiful adventure that I could only follow from the holiday home by the sea. In the city we have so many of those signals, so many of those interconnected repeaters, all over the UHF spectrum. A sewer of RF.
Hi Holger, thanks for the tip.
I have installed the app on all my Android devices.
25.9 or 26 is the same thing for our antennas.
Seeing is believing.
WB beacon passed first at 5000 SR, then at 3500 and then disappeared.
I'm interested but this message appear when I'm trying to browse :
В доступе отказаноВозможно, не загружен индексный файл или неправильно указаны права для него.
Purtroppo Serge non spedisce in Italia...
I'm using the same version (B iI suppose but where is the evidence ?), still having issues with Mititioune express HW. I'm fighting a lot to have a best results, I can decode only down to 1 M/s, below it's impossibile. I downloaded the version :
73 vy best
Alessio, rev B does not require HW modifications.
Page 29 manual.
Alessio, which version do you have the A or the B?
I have the B and I have no problem even with weak signals.
I suggest to put the new version in a different folder from the previous versions and to use only the minitiouneConfig.ini file of the latest version.
poking around in my folders I found this useful tool. I hope it's useful for someone
Bird® RF Calculator
Alessio, no problem here with MiniTiouner Express HW.
And what is this stuff?
as if so many stations simultaneously activated the carrier
But right now there is no active station
Thank you all for the comments.
the cable is H100 and the amplifier is underpowered, everything is set to have a maximum of 3 Watts at the antenna. Less than 10 Watts come out of the house. I know it is not ideal to drop the cable with more than half the power but also in the IF there is a waste of energy. The advantage of having everything at home justifies (perhaps) waste. The system is disassembled in a minute ready to be transported to another site.
The receiving part of QO-100 was ready when the satellite was still on the ground. I planned two different setups. The first for the fixed station and a second one for the operations in /portable.
In the fixed QTH I mounted two antennas; 1 meter dish for the RX (Octagon TWIN LNB) and a second 85 cm dish for the TX, 4 turns Helix antenna.
All the equipment is mounted in the house and the antennas are 22 meters away. This is a choice made later, after checking the satellite in orbit. Everything is naturally ready to go directly under the antennas but at the moment it is not needed.
Some photos that give the idea. In the future I'll put the photos of the second setup not ready yet.
All the holes in the case, the mechanical works, were made by my friend Pino, IK0SMG.