do signals flutuate

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#1
hi guy's
quick question
do signals flutuate enough whereby one min you can pick up a signal and the next time it dosent show up (i suppose with motorised systems this dosn't matter so much (you just lock in with fine tuning)
cheers
 

Topper

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#2
bronking said:
hi guy's
quick question
do signals flutuate enough whereby one min you can pick up a signal and the next time it dosent show up (i suppose with motorised systems this dosn't matter so much (you just lock in with fine tuning)
cheers
Only if your dish is flapping around in the breeze, or your homing pidgeon has decided to warm it's toes on your lnb O-Ha
 

jphili

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#3
Otherwise signals do fluctuate, but typically not on this timescale.
The signal does have a 2* 36000 km track to cover. And particularly fluctiations in the ionosphere along with moisture (i.e. clouds) have an impact on the signal. So you should be able to see when a solar flare/sun wind storm arrives at earht on the strenght of the signal (as long as it's the right time of day)
 

Lancelot

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#4
Unless you are looking at an inclined orbit satellite like 20W.
I which case it can come and go in a couple of hours, even with a conventional motor.


L.
 

alterego

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#5
And the transponder that you're pointed at is only putting about 100Watts out, if you're lucky! So your dish is looking at a light bulb 20 thousand miles away. It never ceases astonishing me that it all works....
 

denis1501

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#6
The answer is yes, signal strength does fluctuate.
I live in Italy. At 10.00 in the morning I have no signal on 11778, V, 11836, H and 11914 H from 28 degrees east. By 11am I have the signal back. Signal goes again in the evening at 22.00 and doesn't come back till the early hours.
regards
D.
 
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#7
I don't have a motorised dish, just get Sky and Astra 1 on small dish in UK.

But, yes, signal strength can fluctuate quite a bit, depending on atmospheric conditions, and goes down a lot in heavy rain. Can be important if you're getting a marginal signal on a large dish.

"Fluttering" would be unusual, and maybe suggests some other problem?
 

Channel Hopper

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#8
bronking said:
hi guy's
do signals flutuate enough whereby one min you can pick up a signal and the next time it dosent show up
Yes, they can fluctuate, even if the satellite is geostationary.

The broadcaster can turn up or down the signal strength, the satellite provider can turn up the wick, or down.
Your region could have a lot of cloud , the uplink could be doing the same
I find the loss of some channels can be fine tuned by adjustment of the Llocal Oscillator settings in the receiver, as sometimes the LNB is drifting ever so slightly with day/night variations, or temperature changes overall.

Of course you may have a mischevious family of :-smallmam playing with that outside join in the cable.
 
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