Tiny SA Ultra - What do the parameters of the lna2 command mean
开云体育Hi Erik, I am going to use auto, but I am writing a channel scanning monitor in B4j which I will publish when I have completed it.? I just want to ensure the application covers all of the parameters available.?? So what are the gains selected for each number?? I wish to make a drop down list for the user to select the gain they want plus AUTO which would be the default. I am building this thing because our TV channels drop out when
the satellite down link to the transmitters fails during rain
events.? The signals are down around -85 dbm so the LNA improves
the signal to noise ratio. A lot of people in our area have bought
new antennas to get over the problem? of dropout, but of course
this is pointless as the problem is with the transmitter down-link
not the transmitters themselves.? At the moment I am using my Tektronix
RSA 607A to do the monitoring, but it ties it up 24/7 and I use it
a lot for ad hoc stuff. That is why I am building the channel
monitor App using the TinySA Ultra.? The software of the Tek is
pretty clunky and its logging facilities are pretty hopeless so
I'm rolling my own.
Here is a screen shot of my app's
config tab page.? All the configs are stored in an sqLite db, and
the logged data will use a separate sqLite db.??
I will probably sample the channels
every minute, but log the channels every five minutes unless the
signals of any channel fall below a minimum or increase above a
maximum, then I will generate a log entry to record the change.??
I have used sqLite for a number of
logging apps and it is very robust and flexible. sqLite also
handles power loss or crashes as it has a write ahead feature
(WAL) which prevents corruption under most power loss or crash
conditions.?
Writing binary or csv files doesn't
cover this. SqLite although it is a single user db without record
locking does allow multiple reading. In logging apps this is fine
because only one app is writing to the database. SqLite is also
ubiquitous on Android and Apple phones so it is multi-platform.
It is easy to export queried data to
csv using tools like sqLite Studio, DB Browser or from any app in
pretty much any language.??
I use B4j as it is written in Basic and
a bit of Java, has a good community and is in active development.
It doesn't have a steep learning curve like C++ or Qt.
You can see from the screen shot the channel allocations used on our Mt Tassie transmitters.? There are five channels:
Each channel has multiple services encoded within them. The blue line represents the band width of the channel and the
colored horizontal line represent the trigger thresholds. I have
the scanning and averaging of scans working. I now have to write the trigger code and the code to store the
scanned data into the data DB. I also have a LiteVNA which I use for TV antenna troubleshooting. I have a Tektronix TTR607A for the lab work, but it is too expensive to cart around, it needs ac mains and the Tek software is clunky and very limited. It doesn't even provide time domain measures for cable analysis.? The LiteVNA is perfect for this work. Kind Regards Rob ------------------------------------------------------------- On 4/02/2024 5:25 pm, Erik Kaashoek
wrote:
0..7 is the available range of gain settings |
开云体育That's OK,
But I do need the LNA it gives me a big boost in SNR. The TV signals are down around -80dB mark. Regards RJG On 6/02/2024 5:12 pm, Erik Kaashoek
wrote:
Bob, |
Rob Garnett