Audio Hiss Over Coaxial Cable DirecTv

[ParkerAudio]

any kind of a adapter I can buy to prevent feedback through coaxial cable. I have a DirecTV PVR receiver, not HD, via coaxial cable, and I am getting a airy sound with my signal. Is there any kind of adapter I can buy to prevent this interference.
I would also describe this as a hiss, it only occurs when the DirecTv is on.

Thanks in Advance

By the way I would use the RCA connection but the DirecTv receiver is located in a different location of the house. So no other kind of connection available besides HDMI, which the DirectTv receiver doesn't have.

 

[markw]

clarification...

Do you get this from all sources or only from the Direct TV STB?

 

[j_garcia]

Have you reviewed this thread:

http://forums.audioholics.com/forums/showthread.php?t=5667

You can get an isolation transformer from Parts Express for ~$10.

 

[ParkerAudio]

Do you get this from all sources or only from the Direct TV STB?

yes only over the DirecTv coaxial, all other inputs are free of the hiss, or airy sound.

I will try the isolator and read the other thread, thanks for all the posts.

 

[markw]

That seems to isolate it to the STB or that input n the receiver. Let's isolate it down to which component.

Can you try another coaxial source, like a CD/DVD player, on that receiver input? I AM assuming you're using a digital signal, right?

If you're running an analog signal, substitute that, preferably using the same cable,

If the hiss still persists, try replacing the cable.

If the hiss still persists with the new source and new cable, it's that input on the receiver.

 

[TLS Guy]

That seems to isolate it to the STB or that input n the receiver. Let's isolate it down to which component.

Can you try another coaxial source, like a CD/DVD player, on that receiver input? I AM assuming you're using a digital signal, right?

If you're running an analog signal, substitute that, preferably using the same cable,

If the hiss still persists, try replacing the cable.

If the hiss still persists with the new source and new cable, it's that input on the receiver.

An isolation transformer will not get rid of hiss. What Direct TV do you have. The standard receiver only has analog outs. The standard non HD DVR has analog and digital SPDIF.

However as I understand it satellite and cable providers have digitally compressed the standard def video and audio signals to the max, to make room for the Hi Def signals. They are trying to maximize these, because that is their cash flow.

So I suspect you are listening to degraded audio, for the above reasons. Also your speakers may be aggressive in the 4 to 6 kHz range. Are your speakers sibilant?

I don't think cable or satellite companies now expect people to use anything other than a TV speaker for standard def. any more. So I suspect your only solution is to move up the HD.

 

[markw]

An isolation transformer will not get rid of hiss.

I never suggested it would. Perhaps you have me confused with someone else?

Personally, I suspect he's using analog audio and the cable box is the culprit but his ambiguous wording causes me to "suspect" he may be using some sort digital feed. That's why the two paths were mentioned.

In either case, I believe that by following my directions, the true culprit will be revealed.

 

[TLS Guy]

I never suggested it would. Perhaps you have me confused with someone else?

Personally, I suspect he's using analog audio and the cable box is the culprit but his ambiguous wording causes me to "suspect" he may be using some sort digital feed. That's why the two paths were mentioned.

In either case, I believe that by following my directions, the true culprit will be revealed.

Sorry I clicked on the wrong post! Garcia suggested the transformer, and the OP was hot to try it.

I think the OP should see whether analog or digital connection sounds best. That Direct TV equipment is very low end junk.

 

[markw]

Not a problem.

Sorry I clicked on the wrong post! Garcia suggested the transformer, and the OP was hot to try it.

I think the OP should see whether analog or digital connection sounds best. That Direct TV equipment is very low end junk.

Hum and hiss are symptoms of two separate problems, each with different solutions.

IMNSHO, hiss would most likely be introduced from an external analog source, not a ground loop issue. That would be hum.

 

[j_garcia]

Disconnect the cable from the STB. If the hiss goes away, then you may have a ground loop or other line noise. Does this noise occur on ALL channels or only on particular ones? Does it rise and fall when you adjust the volume or does it stay constant?

 

[sparky77]

If I understand your post correctly, you have a dtv box in a seperate room connected directly to your tv via coaxial cable, correct?

If your picture is clear, then chances are you're hearing the compression artifacts that tlsguy was talking about.

 

[highfigh]

any kind of a adapter I can buy to prevent feedback through coaxial cable. I have a DirecTV PVR receiver, not HD, via coaxial cable, and I am getting a airy sound with my signal. Is there any kind of adapter I can buy to prevent this interference.
I would also describe this as a hiss, it only occurs when the DirecTv is on.

Thanks in Advance

By the way I would use the RCA connection but the DirecTv receiver is located in a different location of the house. So no other kind of connection available besides HDMI, which the DirectTv receiver doesn't have.

Is there a way to describe the sound using another word? 'Airy' usually means 'open' or 'spacious'. If you turn the sat receiver off, do you hear the same sound? Connect the same cable to the analog sat receiver output and receiver's analog input- how does that sound?

Which DirecTV receiver and how old is it?

 

[ParkerAudio]

when I turn off the directv receiver I do not get the noise, when I use a different device with the coaxial cable, I do not get the sound.
It is a brand new DirecTv DVR, not HD, which sucks more than I thought because I recently upgraded my display and should have gotten a HD receiver. These standard def receivers they have suck. I hate RCA outputs, now that I have been spoiled by HDMI.
Also, yes the receiver is hidden away in a well ventilated closet.
To describe the sound better, I would say sounds like a sucking noise, wind or something like that.
Picture is also clear by the way. No problems with that, well except for the fact it isn't HD.

Speakers currently used are the ones on the Panasonic G10, nothing fancy at this point.

I will be moving up to HD DirecTv receiver probably in November as the new receivers will be able to record two channels with only one coaxial input. At least that is what I have been told.

 

[jneutron]

Hum and hiss are symptoms of two separate problems, each with different solutions..

There are cases where this may not be true. Ground loops are not just capable of 60 or 120 hz intrusion, if the ground current has audible hf components such as hiss, they can still couple at the inputs. For this case, an isolation transformer would actually stop the hiss. If other tests fail, this would certainly be worth trying.

IMNSHO, hiss would most likely be introduced from an external analog source, not a ground loop issue. That would be hum.

I certainly agree with you on the first point, and concur with your recommendations. The second, has caveats, as "buzz" from ground loops is indeed far more than just 60 hz.

Cheers, John

 

[mtrycrafts]

There are cases where this may not be true. Ground loops are not just capable of 60 or 120 hz intrusion, if the ground current has audible hf components such as hiss, they can still couple at the inputs. For this case, an isolation transformer would actually stop the hiss. If other tests fail, this would certainly be worth trying.


I certainly agree with you on the first point, and concur with your recommendations. The second, has caveats, as "buzz" from ground loops is indeed far more than just 60 hz.

Cheers, John

The resurrection of jneutron
Where have you been and how is it going?

 

[jneutron]

The resurrection of jneutron

Been here all along. Just had nuttin ta say...

Where have you been and how is it going?

Here. And, I've been a beddy beddy busy boy.

They say "may you live in interesting times". Boy, has it ever been.

But luckily, I've been able to dodge the "travel bullets" so far. Alas, that may soon come to an end...

First, there t'werent enough engineers....

Now, there's plenty, and they need to be taught...sigh...


How have you been?

Cheers, John

 

[KODG]

Cable To Eliminate Hiss

any kind of a adapter I can buy to prevent feedback through coaxial cable. I have a DirecTV PVR receiver, not HD, via coaxial cable, and I am getting a airy sound with my signal. Is there any kind of adapter I can buy to prevent this interference.
I would also describe this as a hiss, it only occurs when the DirecTv is on.

Thanks in Advance

By the way I would use the RCA connection but the DirecTv receiver is located in a different location of the house. So no other kind of connection available besides HDMI, which the DirectTv receiver doesn't have.

SHOP FOR A USED AUDIOQUEST DIECTV AC CORD (JUST ONE WITH THE PROPER FEMALE ENDS) THAT HAS TWO RF FERRITS ATTACHED, IT SHOULD TAKE CARE OF YOUR PROBLEM & YOU CAN FIND THEM USED PRETTY CHEAP. ALSO MAKE SURE YOUR COAXAIL DIRCTV CABLE IS'NT RUNNING ON OR ON TOP OFF OR NEAR ANY AC POWER CABLES CABLES.

KODG