What is the maximum signal a terrestrial decoder can handle?

D

DishDick

Regular Member
My Satellite Setup
.
My Location
Gran Canaria
I know most people have problems getting enough signal, but where I am I am approx 100m from a transmitter with clear line of sight. I am always amazed that everyone around me has a high gain wide band aerial!

I just wanted to know how much signal is too much, as I remember in the UK having to buy an antenuator for my Ondigital box when I had a new High Gain aerial fitted as it was overloading the box - and I was in a fringe area!

On my Rover, without taking much trouble to align my class 3 aerial I have a noise margin of 15db.
 
Here in the UK isn't too much of an issue as using 8K mode. Receivers seems to cope with high signals levels of 70dBuV+. Anywhere between 50dBuV and 70dBuV should suffice.
 
I've seen some boxes handle 80dBμV before now, but by experience most of the cheapo boxes have a tendency to play up when the signal approaches 70dBμV, normally pixilating as if it was a poor quality signal.

I normally attenuate the signal down to about 50 - 60dBμV as a happy medium.

Nano
 
hello,
all receivers,tv sets decoders and radios and sat receivers have a agc ( automatic gain circuit) that compensates for signal levels to keep it at a constant level.
this agc will increase the gain if the signal goes down, and visa versa.
if you look at a sat receiver it will show -35 to -65 dbm the -65 is the weeker signal and the - 35 is the stronger signal.
ralph
 
I did an instal for a friends salon yesterday, signal was 30dbuv. Salon low down from transmitter (very hilly here) but still close as the crow flies, and I had to do a very descrete install to please the landlord. All channels came in nice and strong, so out of curiosity what would be the lowest reliable sigal?

Thanks.
 
hello,
this depends on decoder type.i would say 20 to 30 is low but id it works no problem.
you should see when it is raining hard .
the lever will drop in heavy rain and is you are receiving 30 db and its raining hard and it is still good you have it.
in the old analog days anything less that 47 db would give you a grainy picture.
ralph
 
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