Why no sound from DVR to TV when using coax?

[lithnights]

Hello all,
I just purchased a DVR and connected the coax cable from the wall into the DVR, then from the DVR into my TV. When changing channels using my DVR, I see video but get no sound from the TV. The TV is on Video1.

Previously I had my VCR hooked up in the same manner (coax from wall, then through VCR into TV) and I had video and HAD SOUND. I would have my TV on channel 4 when doing this and change the channels via the VCR.

What is the difference here?

I know I can configure my wires to get sound using the Video in 1 inputs on my TV but I was just curious why the coax alone doesn't work the same with my DVR as it did with my VCR.

Thanks!

 

[markw]

What kind of "coax" are you talking about? There's several implementations

When you say "VCR" are you talking about the type of "coax" like the cable company uses with those screw on "F" connectors? These pass both video and audio on one cable via an RF carrier which then is fed through a TV channel?

Or are you talking about the type of coax which uses those push on "RCA" connectors? These only pass one type of signal and generally come in three "colors". Composite video is usually passed via yellow plugs and jacks and audio is usually passed through red and white plugs and jacks.

 

[lithnights]

Screw on F connector.
Not the composite yellow, red, whites.

 

[markw]

You're saying the DVR outputs via a screw on "F" connector"

Screw on F connector.
Not the composite yellow, red, whites.

I'm surprised it does that but what do I know? It sounds like it's not modulating the audio along with the video. If that's the case, check the DVR's manual for some setup functions. The problem would be eithin the DVR unit, not the TV.

In all honesty, I don't know why you would want to compromise the quality of a DVD picture by using an RF connection when other options exist.

One question... that "video 1" on your TV to which you refer... is that a "F" connector or a yellow RCA jack? Most "video 1" inputs on all the TV's I've come into contact with consist of some sortr of video input (S-video, and/or RGB component and/or yellow RCA composite) and separate red/white RCA audio inputs.

 

[lithnights]

I'm surprised it does that but what do I know? It sounds like it's not modulating the audio along with the video. If that's the case, check the DVR's manual for some setup functions. The problem would be eithin the DVR unit, not the TV.

In all honesty, I don't know why you would want to compromise the quality of a DVD picture by using an RF connection when other options exist.

One question... that "video 1" on your TV to which you refer... is that a "F" connector or a yellow RCA jack? Most "video 1" inputs on all the TV's I've come into contact with consist of some sortr of video input (S-video, and/or RGB component and/or yellow RCA composite) and separate red/white RCA audio inputs.

Agree about the compromising of the DVD picture quality. In fact, I DO intend do hook up RGB component from the DVR into the VIDEO1 input of the TV and also hook red/white audio composite from DVR to VIDEO1 input of the TV. That way my non technical family who may want to watch a recorded "Seinfeld" rerun off the DVR will not have to mess with the receiver to listen to it.

I'm just wondering why that simple F connection would not bridge the audio from the DVR to the TV. I will do as you suggest and check the DVR for setup functions.

Also, to answer your last question, the VIDEO1 on my TV I talk about is the actual video input.. composite, S video, or in my case, RGB component. Not the F connector. That is a separate input.

Anyone else have any ideas?

Thanks!

 

[markw]

Just one more question

"I just purchased a DVR and connected the coax cable from the wall into the DVR, then from the DVR into my TV. When changing channels using my DVR, I see video but get no sound from the TV. The TV is on Video1."

How did you hook up the "F" connector to the video 1 input? I'm surprised you got anything at all.

I could be wrong, but I do believe that when you select the Video 1 input, the TV is not looking for a modulated RF input. It's looking for a video (composite, S-video or RGB component) input. It's also expecting the audio to be input into the corrosponding red/white inputs.

Hmm.... Are you sure you're passing a modulated RF signal and not a composite video signal here?

 

[MDS]

If the tv input that is labeled 'video 1' has composite video and analog audio inputs, then it is not the input you would choose to view the output of the dvr. If you connect video and audio cables from the dvr to the tv's video 1 input, then you would use video1 on the tv.

On most tvs, the cable/antenna input will be called 'tv', 'cable', or 'antenna'.

 

[lithnights]

If the tv input that is labeled 'video 1' has composite video and analog audio inputs, then it is not the input you would choose to view the output of the dvr. If you connect video and audio cables from the dvr to the tv's video 1 input, then you would use video1 on the tv.

On most tvs, the cable/antenna input will be called 'tv', 'cable', or 'antenna'.

I agree. Since I may have made this more complicated than it has to be.. let's take this simple assumed scenario...

I have a TV with no inputs/outputs except the little F connector that one would plug the cable line into.

I have a VCR with no inputs/outputs except the F connector input and output.

I hook up the coax cable into VCR F connector input, and a separate coax cable from VCR F connector out to TV F connector IN. (On my VCR there is a little switch on the back that I can choose either channel 3 or channel 4.. I choose channel 4). I put my TV on channel 4, hit the VCR/TV button on the VCR, and can flip VCR channels and watch and hear cable TV.

I then replace my VCR with a DVR with the same coax cable setup and want to flip DVR channels. Is it not possible to adjust the DVR (pick channel 3 or channel 4 like I did with my VCR) and just put my TV on channel 4 and do the same thing? Or are DVRs different from a VCR in that respect?

Remember, assume no Video/Audio in/outs on the VCR or TV... simple scenario...

Sorry for the confusion..

 

[markw]

If the DVR has a...

...modulated audio/video RF output via a "F" connector, then it should work as you want if plugged into an antenna input, not a video input. Check your owner's manual.

But remember, up to this post you said you were using the "video 1" input.

Again, read your DVR owner's manual to see what it's supposed to do. Only you have access to this info. I'm surprised you haven't done so already

 

[lithnights]

...modulated audio/video RF output via a "F" connector, then it should work as you want if plugged into an antenna input, not a video input. Check your owner's manual.

But remember, up to this post you said you were using the "video 1" input.

Again, read your DVR owner's manual to see what it's supposed to do. Only you have access to this info. I'm surprised you haven't done so already

I thought the whole time I was talking about using the coax F connectors. Others did mention the VIDEO1 but I think I confused them by my first couple posts. The only time I mentioned VIDEO1 was my 6:40 post where I said I was intending to use the VIDEO1 inputs in the future...

I actually checked the owners manual but didn't find anything.. I am continuing to read...

 

[markw]

This is your first post verbatim. Read the first paragraph.

Hello all,
I just purchased a DVR and connected the coax cable from the wall into the DVR, then from the DVR into my TV. When changing channels using my DVR, I see video but get no sound from the TV. The TV is on Video1.

Previously I had my VCR hooked up in the same manner (coax from wall, then through VCR into TV) and I had video and HAD SOUND. I would have my TV on channel 4 when doing this and change the channels via the VCR.

What is the difference here?

I know I can configure my wires to get sound using the Video in 1 inputs on my TV but I was just curious why the coax alone doesn't work the same with my DVR as it did with my VCR.

Thanks!

Particularly the last sentence. No confusion here. It looks pretty explicit to me.

 

[lithnights]

Particularly the last sentence. No confusion here. It looks pretty explicit to me.

Ahaaaa.. I see the guilty sentence. Yes, misleading.. What I was trying to say is I know I CAN utilize the VIDEO1 inputs but am truly wondering about the F connectors. I should have just left that sentence out I guess.

Oh well, I'm still not clear on an answer but thanks all for your responses.