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Will Adding An Attenuator Help?
kah22
Posts: 1,896
Forumite
in Techie Stuff
Hopefully some of you electronic wiz kinds reading will be able to help me.
My situation is that I receive television from both the UK and the Irish Republic. Each need a different aerial, both of these aerials have been professionally updated about a year back. The Irish Republic aerial has a mast head amplifier fitted, the aerial goes into my Humax PVR aerial IN socket. The problem lies with the antenna power.
However, over the past few weeks it seems as if the Freeview reception has become too strong with the Humax’s internal amplifier is switched on. If I look at the signal quality it keeps jumping all over the place. Switch it off and you get a perfect Freeview picture!
On the other hand if you switch the amplifier off then the broadcasts from the Irish Republic disappear. Switch it on and a perfect picture reappears. See my problem?
I’ve been reading about attenuators, ‘When a Freeview receiver detects a signal which is too strong, its automatic gain control (AGC) adjusts the tuner gain down to compensate. If the signal is _way_ too strong, the AGC tries to protect the receiver by overcompensating and turning the gain down much further. The result is often that the signal level display is quite low when the signal is way too high.
Adding an attenuator reduces the incoming signal, causing the AGC to "relax" and the signal reading will go up! But I don’t really understand what that means in reality.
Does it mean that if I add one of these things to my system that it will ‘relax’ the interference when antenna power is switched to ON, but not affect the other channels which need the amplifier to work.
If this is the case what sort of attenuator should I buy. As a matter of information I also have access to a 12 volt PROreception box that can plug in at the televisions power point.
Kevin
My situation is that I receive television from both the UK and the Irish Republic. Each need a different aerial, both of these aerials have been professionally updated about a year back. The Irish Republic aerial has a mast head amplifier fitted, the aerial goes into my Humax PVR aerial IN socket. The problem lies with the antenna power.
However, over the past few weeks it seems as if the Freeview reception has become too strong with the Humax’s internal amplifier is switched on. If I look at the signal quality it keeps jumping all over the place. Switch it off and you get a perfect Freeview picture!
On the other hand if you switch the amplifier off then the broadcasts from the Irish Republic disappear. Switch it on and a perfect picture reappears. See my problem?
I’ve been reading about attenuators, ‘When a Freeview receiver detects a signal which is too strong, its automatic gain control (AGC) adjusts the tuner gain down to compensate. If the signal is _way_ too strong, the AGC tries to protect the receiver by overcompensating and turning the gain down much further. The result is often that the signal level display is quite low when the signal is way too high.
Adding an attenuator reduces the incoming signal, causing the AGC to "relax" and the signal reading will go up! But I don’t really understand what that means in reality.
Does it mean that if I add one of these things to my system that it will ‘relax’ the interference when antenna power is switched to ON, but not affect the other channels which need the amplifier to work.
If this is the case what sort of attenuator should I buy. As a matter of information I also have access to a 12 volt PROreception box that can plug in at the televisions power point.
Kevin
0
Comments
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An attenuator has no intelligence and will attenuate every signal which passes through it. I'm not clear how your aerials (two aerials into one STB) are set up. Is there a switch or are they fed through some sort of combiner?Hopefully some of you electronic wiz kinds reading will be able to help me.
My situation is that I receive television from both the UK and the Irish Republic. Each need a different aerial, both of these aerials have been professionally updated about a year back. The Irish Republic aerial has a mast head amplifier fitted, the aerial goes into my Humax PVR aerial IN socket. The problem lies with the antenna power.
However, over the past few weeks it seems as if the Freeview reception has become too strong with the Humax’s internal amplifier is switched on. If I look at the signal quality it keeps jumping all over the place. Switch it off and you get a perfect Freeview picture!
On the other hand if you switch the amplifier off then the broadcasts from the Irish Republic disappear. Switch it on and a perfect picture reappears. See my problem?
I’ve been reading about attenuators, ‘When a Freeview receiver detects a signal which is too strong, its automatic gain control (AGC) adjusts the tuner gain down to compensate. If the signal is _way_ too strong, the AGC tries to protect the receiver by overcompensating and turning the gain down much further. The result is often that the signal level display is quite low when the signal is way too high.
Adding an attenuator reduces the incoming signal, causing the AGC to "relax" and the signal reading will go up! But I don’t really understand what that means in reality.
Does it mean that if I add one of these things to my system that it will ‘relax’ the interference when antenna power is switched to ON, but not affect the other channels which need the amplifier to work.
If this is the case what sort of attenuator should I buy. As a matter of information I also have access to a 12 volt PROreception box that can plug in at the televisions power point.
KevinThere's love in this world for everyone. Every rascal and son of a gun.
It's for the many and not the few. Be sure it's out there looking for you.
In every town, in every state. In every house and every gate.
Wth every precious smile you make. And every act of kindness.
Micheal Marra, 1952 - 20120 -
The two must be joined together on the roof in a two in one out type box. There is only one aerial cable entering the house.An attenuator has no intelligence and will attenuate every signal which passes through it. I'm not clear how your aerials (two aerials into one STB) are set up. Is there a switch or are they fed through some sort of combiner?0 -
The two must be joined together on the roof in a two in one out type box. There is only one aerial cable entering the house.
The you would need to place any attenuator in line with the aerial receiving the stoner signal before that combiner.There's love in this world for everyone. Every rascal and son of a gun.
It's for the many and not the few. Be sure it's out there looking for you.
In every town, in every state. In every house and every gate.
Wth every precious smile you make. And every act of kindness.
Micheal Marra, 1952 - 20120
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