Looks like it is almost the same as C/N:
https://en.wikipedia.org/wiki/Modulation_error_ratio
https://en.wikipedia.org/wiki/Carrier-to-noise_ratio
And D5 value mean Link margin
Link margin = CN - CNmin
CN - actual C/N or??? MER
CNmin - minimum C/N to decode DVB-S signal.
For DVBS-2, 7.2 Msym, 8PSK, 3/4 FEC C/Nmin is 7.9 dB.
For DVBS-2, 1.5 Msym, QPSK, 4/5 FEC C/Nmin is 4.6 dB.
Hello!
I have technical resources (Raspberry Pi mini server) to record 24/7 emergency channel, but don't have time for audio editing (there mostly will be silence/background noise) and don't have file storage. Does anybody interested to store and edit emergency channel recordings? I have scripts for automatic upload to AmazonAWS, Google drive and ftp server. Anybody interested?
Did anybody made teardown reviem about GTMedia sat finder? I wonder what is inside (major IC names, tuner, OS etc) and why it works with QO-100.
Hmm...
v0.1
v0.2 internals
v0.2 exterior
There are many different things:
1) To build hardware for QO-100 ground station. (This is my favorite)
2) Work on QO-100 transponder.
3) Make remotely controlled station for QO-100, without public access.
4) Work on QO-100 via internet (most boring).
So. Goals 1-3 are great and everyone is invited to do it. This is really good for HAMs. New skills and knowledge.
Goal 4. It is no so exited because you just connecting to website, server, etc and work. What is difference for QO-100 and other remotely controlled (HF) stations? I think that useless because you are using someone else gear while QO-100 is another push to build something yourself interact and experiment with transponder directly. That's the point.
Small story:
While I wait for QO-100 I had a question: so I will build stations, what next? I made some TX to transponder, test my gear, fix error and TX again. Still no QSOs. Meybe some HAMs notices two carriers (1 kHz space between them) on transponder few weeks ago (feb 16 and 23). I tested my TX (WiFi booster) linearity, freq stability and signal level. I don't feel that I need to start SSB QSOs right now. Maybe later. Now I am working on DATV RF amp stuff and trying to build ethernet controlled portable station for QO-100.
I got 2x50W amp from SP2JYR guy.
https://www.ebay.co.uk/itm/2-3…-2x-200W-max/202602129750
Now we are researching how to launch it.
More discussions here: https://groups.io/g/Polishamps/topics
Sometimes even worse. They are writing on package PLL ultaHD LNB blablabla, but actually it is DRO LNB.
For me it is already started on 25th Feb up to 3rd Mar. But my RX station is down to some upgrade. So I'll follow on WebSDRs.
Hmm... Port B works for me without any problems with v0.8 software.
Only class A HAMs (HAREC license) (I am class B, so no permission) have permissions to transmit with power less that 50W feeded into antenna while not making any interference (WiFi etc???).
http://lral.lv/files/MKnot_radioamatieri.pdf on pages 17-18. fro class A.
PS: To get class A, class B need to collect 1000 QSOs (recommended format .ADIF) to get to class A licence. I have ~600 of 1000, so soon, really soon be on QO-100.
Class B permission on page 19. 
Maybe someone can become policeman and simulate leila from his ground station? I mean, TX on aligator channel siren manually.
It would be nice if people can add mixer IC name together with LNB manufacturer name. Something like TFF1015 or RT320M etc because sometime LNB manufacturer name and/or product name doesn't tell much.
Yes, please ignore and do not tweet this signal. Let's leave observation only on this forum and IRC.
In my setup (described here) i solve this problem with a function called "auto tracking". It tunes the transmitter frequency automatically depending on receiving frequency. Fine tuning of RX/TX offset is possible too.
It would be interesting when I can try your software.
DH2VA am I approved to be good guy instead of black hat?
PS: my previous experience is only ~ 600 QSOs on short wave (most of them in FT8). I joined to this "club" on September 2017.
OK, seriously. DB8TF question about "test&adjustment" "subband" window is interesting. I had an idea that I can do my freq and power calibration on CW "subband" by sending "YL3AKC TX CALIBRATION NO ANSWER PLS" in morse and then move to SSB or (my favorite) FT8 on NB transponder. What is Amsat-DL statement on calibration and additional "subband" window?
No, no, no. It works in different way:
1) Wait for NB transponder noise (NB transponder ON) <-- I am here 
2) Aling RX antenna
3) Wait for Upper and lower beacon
4) Adjust and test your RX equipment
5) Wait for NB officially open
6) Try CW with minimum power and lidten on RX (or watch webSDR), adjust TX antenna pointing.
7) Try test CW with minimum power and test your RX frequency. Adjust TX equipment
8 ) Try to make QSO on CW, SSB, FT8
9) Play with TX power
10) DVB-S/S2 eperiments
So far, no mods on WiFi booster (OK, I removec DC barrel and solderes PSU wires directry to PCB). I am so lazy... I am waiting when NB transponder will be open and only then start to so something...
DL3DCW, Will you publish source code for drift correction app? It would be very interesting. Right now I stuck with GRC simulation. Something is working, something is not working.
Out of stock right now.
