Just installed a new dish-antenna, prime focus 180cm.
The beacon give me a MER of 11.4 on this moment.
Now is my question is this a good value for my dish-antenna?
I have no reference so no way to check that number.
But what is MER, how is that calculated?
Means 3dB MER more also double the power, same as by a HF-amplifier
Looks like it is almost the same as C/N:
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.
I am also using a 1.8m dish.
MER here is maximum 11.9dB.
If there is more traffic on the transponder the MER goes down.
Thus your MER of 11.4 sounds right.
I looked at the pictures on your website. It looks all very good!
Here is a picture of my dish:
Here in JN61FQ with 100 cm dish, octagon twin LNB, MER = 11.1 dB, +2dB compared to before.
Typically around MER 12 with nobody else on. It's 11.6 at the moment as the transponder is fairly busy, but no big 1 MHz carriers. When they come on it drops quickly well below 11.
I'll try different LNBs soon. May be it will bring me some improvements.
Could be that the GPSDO (27MHz for the HD-BP2) degrades the signal quality somehow.
G0MJW: your dish size is > 1.2m I guess Mike?
Tried these unmodified LNBs without any improvement:
Megasat Diavolo Twin
Octagon Green HQ OTLG
Opticum Twin LNB LTP-04H