Is your DStv dish too small?
First-time DStv users may have installed dishes smaller than MultiChoice’s recommended size
First-time DStv users may have installed dishes smaller than MultiChoice’s recommended size
Since upgrading to HD in December there have been a number of times when my HD signal went out, but the SD signal on my extra-view decoder was fine, coming from the same dish. It's very annoying because they don't tell you this when you fork over the cash for the HD decoder.
Maybe somebody can clear this up for me as I don't understand it...
We changing signal or whatever in order to get mor HD channels and therefore need a bigger dish.
How come SkyDigital in the UK has a minuscule dish (it's seriously small!!!) and they have like 50 HD channels???? And I've never ever experiencd any signal degradation over there and trust me, when it rains, it rains!!
Sounds like a money making scheme to me from Multichoice
Maybe somebody can clear this up for me as I don't understand it...
We changing signal or whatever in order to get mor HD channels and therefore need a bigger dish.
How come SkyDigital in the UK has a minuscule dish (it's seriously small!!!) and they have like 50 HD channels???? And I've never ever experiencd any signal degradation over there and trust me, when it rains, it rains!!
Sounds like a money making scheme to me from Multichoice
That "slightly" higher signal level you refer to, is arround 3dBW. 3dBW translates to double the power, not slightly as the number seems to mislead (see basic logaritmic calculations).
Therefore a receiver located at a point 3dBW lower than the "sweet spot" will have to have twice the area to achieve the same signal gain.
It is interesting to note that a 90cm dish has roughly 2.2 times the area of a 60cm dish while a 80cm dish only comes in at about 1.7 times. This would somehow suggest that Multichoice is ensuring good reception for the worst case scenario (which makes sense).
The graphic below from Intelsat shows that central SA enjoys slightly higher signal strength than the rest of the country.
Since canceling my DStv last year my dish is 100% too big. Should probably take it down.
Since canceling my DStv last year my dish is 100% too big. Should probably take it down.
That "slightly" higher signal level you refer to, is arround 3dBW. 3dBW translates to double the power, not slightly as the number seems to mislead (see basic logaritmic calculations).
True, but in the RF world 3 dB is considered little. When planning PtP microwave links, a fade margin of about 10 dB is fairly common.
Yikes. If my memory isn't failing me now, we used to design filters (in digital signal processing / linear systems) using -3dB as the cutoff. That is, anything beyond that cutoff is expected to have such poor SNR that it is considered "filtered".