A little strange experience over the past few days:
I tested various LNBs on tuesday. Got consistant 12.5 dB C/N readings on 10773H with both Inverto Black Ultra Quattro and Inverto Black Pro + CM feedhorn.
Measured several times having swapped the feed back and forth.
All yesterday, I suddenly got 11 dB on 10773 (and similar drops on other 2E transponders) - without changing anything from the last 12.5 dB measurement.
This evening, I'm down to 10.2 dB, even across a span of several hours. Still not changed anything physical. Weather is splendid - clear skies and not a cloud in sight.
Signal strength has also dropped, but only around 0.8 dBuV.
There could be several reasons:
1) Dish has moved. Very unlikely, the dish has been up 4 years now, and survived several gale-force storms wihtout budging. Difficult to see why it should move in light winds in the summertime.
2) LNB is not fastened properly after experimentation work, and is "un-skewing". Not the case, the LNB is firmly fixed to the LNB holder.
3) Daily fluctuations of sat orientation. But this should be over the period of a day, but with similar readings at same time on different days.
4) General fluctuations in satellite orientation. Not sure if 2E changes regularly that much??
5) Moisture in the air - assuming that moisture absorbs and disperses signal. But the airmass seems to the same, and we're talking up to 2+ dB now.
Dunno - maybe it's a combination of many factors...
Weird thing is that 2G readings on 11023H taken at the same times are roughly the same, with a light reduction in strength (0.5dBuV) and possibly eve a slight increase (0.2 d
of C/N.
Does anyone else reckognise this behaviour?
Is this what you guys experience regularly?
Short-period (days) fluctuations of 2+ dB?