Jumbo Moire Pattern & Hissing?

Lee

DTVUSA Jr. Member
#1
Hi all,

Sorry this is a book but I tried to explain it as well as I could in hopes someone can help me figure out what to do next......

We are non-cable, non-dish folks with nice but moderately old (early 2000s) non-LCD equipment:

* A 32" JVC with multiple AV inputs and set up with DVD player and VCR. The VCR has only 1 AV out. It was originally linked to the 32" by an RF cable. This is the one with the problems...

* A couple of 20" Panasonics with just one AV input and with DVD players.

Our antenna is a roof ridgeline mounted LARGE mast with 2 tiers of prongs and connected by RF to the VCR in the 32" set up and to the 20". It's fairly new and we have had great reception on 6 VHF and 8 UHF channels with it. Our location is 30 miles from the station antennas in Phoenix. They are on a mountain top on the south side and we are on the up slope of the north side of this big bowl of a valley here. We're in a rural type area and there are no big trees or buildings here or anywhere between us and the signals. We have had some issues receiving one of the VHF stations but moving the antenna a bit (DH climbs up on the roof!) resolves it until the next big wind comes along.

Well, I bought 2 Tivax STB-T9 model DTV converters and DH hooked one up to one of the small Panasonics. He had to remove the DVD to do it and he used BOTH the RF connection and the AV connection to do it. That set seems to work fine, picking up the digital signals clearly and the Tivax remote works fine if a little slow in response time. I think that I need to remove the RF connection because I'm pretty sure that's redundant - you don't need both RF and AV connection from DTV box to TV according to the instructions but DH went ahead with those anyway. I'm also pretty sure that in order to use the DVD player with this, I will have to buy an AV splitter so I can hook both up. That can wait though...

DH is way not happy to work on the big TV and I end up having to do it -- he loses patience with all the wiring in that armoire (there is also a stereo receiver, CD player, cassette player and speaker connections in the same cabinet).

So the Tivax comes with NO INSTRUCTIONS on how to use it with a TV, VCR and DVD player. You are only shown how to hook up a DTV box to a TV, period. So I googled for the past 2 days and finally figured out that I needed to connect it this way:

Disconnect Ant In from VCR - - Connect Ant In on DTV box - - Connect new RFcable out to Ant/RF cable in on VCR.

The reason for this connection as I understood was to allow recording on the VCR (I do realize the HUGE limitations our lovely govt has given us on our VCRs with the timer no longer really working to change channels...). This RF was also a simpler connection to perform with the layout of the equipment.

I also read about using the the AV connections INSTEAD of RF between the DTV box and the TV and that this was supposed to give higher quality image. But tearing everything up to get to the back of the TV and losing the option to record on the VCR steered me off this option. I thought about trying to use AV connections from DTV box to the VCR but there is only AV OUT ports on the VCR which I assume would not work since the DTV box needs to feed INTO the VCR, not into it's OUT AV ports .

So OK I got the 32" all set up, figured out how to set the various buttons on the 3 remotes and the DTV box autoscanned fine to get all the channels and more. The picture was pretty clear but there was very faint interference showing up as jumbo size moire patterning over the screen and a low hiss in the audio. I wasn't happy about the degradation but it was liveable for a time while I intended to research to fix it. That was at 5 pm. I left it on and we had dinner. Returning at 7pm, the jumbo moire has turned into REALLY REALLY strong interference (like major snow from the old days of rabbit ears, in a fingerprint/moire pattern) and the hiss is quite loud now. Just in time for the new season episodes of Desperate Housewives and Brothers & Sisters. Very annoying.

All channels show the same level of interference and hiss. Checking the signal strength shows that all channels have 100% strength except for 2 which are still in the GOOD zone of 50-60%. Those lower strength channels were coming in the same as the 100% ones earlier and there's no difference in the interference on those stations now. I've turned off and on different lights, fans, computers, etc. and nothing makes a difference. I can think of nothing that changed from 5 pm to 7 pm except that it got dark and the programming changed.

The 20" Panasonic that DH hooked up in the simple connection is not having these problems during this time - the picture is clear and no hiss is present. In fact, it's beautiful. GRRR....

Is there something I am missing? What does this sound like to those who understand this stuff? Obviously this type of connection is not optimal but what other way can I connect it so I can tape with the VCR? Is there some way to force the VCR to have AV IN ports (splitter or RF Modulator or other add on) so I can have the DTV box send a good signal to the VCR's AV IN and then use the VCR's AV OUT ports to send the signal on to the TV?

This is so frustrating. Not only do we have to pay through the nose just to maintain the ability to have TV but we have to be tortured with the technology and apparently the govt could care less about making sure people can actually use their analog TVs and VCRs. I cannot believe all these potential set ups are not thoroughly covered on the govt website as a support for those of us getting the shaft.

As it is, we have 8 more devices to either throw away or "upgrade" by paying full price for DTV boxes. Really annoying when we've worked hard to conserve our $$, buy good stuff that lasts and take care of it. Now it's just obsolete and we have to pay all over again while being tortured with the details of it all. Sickening.... one can only hope for some real change in organization like the FCC. But I'm not going to hold my breath.

Thanks for any help you can offer and thanks for listening to my rant....
 

Byte24

DTVUSA Member
#2
Hi Lee,
Sorry this is a book but I tried to explain it as well as I could in hopes someone can help me figure out what to do next......
No worries at all, the more detail, the better we can all help everyone. I'll take a good look at this again in the morning and give my $.02.
 

Jason Fritz

Administrator
Staff member
#3
Hey Lee, you're practically my neighbor here in AZ!

Your post is so large and in great detail, I'm going to try and break it down into sections when replying. I've got a few questions for you if you can answer when you have time...

...I left it on and we had dinner. Returning at 7pm, the jumbo moire has turned into REALLY REALLY strong interference (like major snow from the old days of rabbit ears, in a fingerprint/moire pattern) and the hiss is quite loud now. Just in time for the new season episodes of Desperate Housewives and Brothers & Sisters. Very annoying.

All channels show the same level of interference and hiss. Checking the signal strength shows that all channels have 100% strength except for 2 which are still in the GOOD zone of 50-60%. Those lower strength channels were coming in the same as the 100% ones earlier and there's no difference in the interference on those stations now. I've turned off and on different lights, fans, computers, etc. and nothing makes a difference. I can think of nothing that changed from 5 pm to 7 pm except that it got dark and the programming changed.
Most RF modulators on these converter boxes will do mono sound only, so you'll need to make sure the audio output setting option on within the converter box menu is set to "mono". This may clear up the hissing noise you're receiving on the 32".

Disconnect Ant In from VCR - - Connect Ant In on DTV box - - Connect new RFcable out to Ant/RF cable in on VCR.
So you've...

Connected the antenna RF connection into the converter box antenna input.

Connected RF from Converter ouput to VCR IN

Connected RF from VCR Out to TV In

Is that how you're connected?

If so, you've got everything connected just fine. I don't think you'll need to worry about getting any type of splitter. The one thing you want to make sure of, is that you're not feeding the television with redundant connections via RCA and RF. I don't think it'll have a bad effect overall on the picture or sound, but it won't provide any benefit.

Anyway, I'll take a look at your post again tonight when I come home from work. From the sound of it, so far, you're worst problems are the hissing noise and moire patterns.

As it is, we have 8 more devices to either throw away or "upgrade" by paying full price for DTV boxes. Really annoying when we've worked hard to conserve our $$, buy good stuff that lasts and take care of it.
I agree completely with this statement, although I love the step forward in technology. It's hard to understand why there can't be a slow transition over the next year or two for consumers. It seems like it would give TV broadcast stations and consumers plenty of time to work the bugs out of upgrading to DTV.
 

Byte24

DTVUSA Member
#4
It sounds to me like you may have a bad converter box. There have been reports of "lemon" converter boxes that don't work right out of the box. Have you tried connecting the same unit that's giving you the moire problem, to a different TV? Better yet, you may want to try connecting that Tivax unit to the 32" TV without going through the VCR just to confirm that it isn't the VCR giving you the problem.

It's almost like troubleshooting a tech problem with a computer. You have to start from the ground up, hehe.
 

Lee

DTVUSA Jr. Member
#5
Thanks for the feedback, Jay. I'll put some answers BELOW your questions.

But before I go any further, I have to report that I successfully cleared up the jumbo Moire interference pattern. After writing my post, I rechecked all the connections and I think that the ANT In RF cable may have damage inside. From the outside, the "cuff" (that metal band at the end) looks a bit squished and when I moved it around, the visual interference completely disappeared. The bad news is that it had absolutely no effect on the hissing. And the hissing is a lot more annoying than I initially thought because at first I had the volume down very low, during installation. At normal viewing volume, it's quite noticeable and annoying.

Most RF modulators on these converter boxes will do mono sound only, so you'll need to make sure the audio output setting option on within the converter box menu is set to "mono". This may clear up the hissing noise you're receiving on the 32".

I don't have an RF Modulator. I don't know what it's for or even know if I might need one to make this work. I only know that some of the diagrams I looked at online showed the use of one of these - that's why I mentioned it, because I know that for some reason, these might be used.

Here is where I read more about RF Modulators but I still don't really get what they are for: RF Modulator Still, somehow it seems like maybe it's part of my solution, both for the 32" and 20" TVs. Very confusing...

Are you saying that the purpose of the RF Modulator is to control the audio, like a filter such I use on a phone line? These might address the hissing?


So you've...

Connected the antenna RF connection into the converter box antenna input.

Connected RF from Converter ouput to VCR IN

Connected RF from VCR Out to TV In

Is that how you're connected?

Yes, that's it.

If so, you've got everything connected just fine.
Yeah!

I don't think you'll need to worry about getting any type of splitter. The one thing you want to make sure of, is that you're not feeding the television with redundant connections via RCA and RF. I don't think it'll have a bad effect overall on the picture or sound, but it won't provide any benefit.

My error here - I wrote about BOTH our TV set ups in my one post and that was confusing. I'll talk about only the 32" here (w/VCR & DVD player) and make a separate post about the 20" (with DVD only).

Actually, I think that maybe I should get an antenna splitter so I can split the RF line into 2 -- one to the VCR and one to the 32" TV. Then, of course I will have to reinstall the DTV converter directly to the TV instead of to the VCR as it is now. I am thinking that then I could use the AV connections between the DTV converter & TV which they say is a higher quality connection (maybe will fix the hiss?). I think this would also mean I'd have to either get a 2nd DTV converter to connect to the VCR OR replace the VCR with a digital version. That is if they are making digital VCRs... haven't a clue, but maybe it would not be much more expensive than a converter box if they do.



I agree completely with this statement, although I love the step forward in technology. It's hard to understand why there can't be a slow transition over the next year or two for consumers.
Well, I could really care less about new technology for the TV. I just want to be able to see the regular broadcast network stations, be able to use my VCR and DVD player, and if the picture is clear and the sound clear, that's all that's really necessary. That's what we had with analog - now we are being tortured into accepting less (loss of VCR capablity, loss of many devices unless we pay to upgrade) in order to get "more" (extra digital channels, "better" picture, multiple aspects). The "more" isn't of much value to me really, although maybe I'll like the extra PBS stations. On the quality, as a photographer, I don't really feel that the digital picture is better - especially of people. A lot of the faces look really bad because there is too much definition. In fact, one guy I saw last night looked like a really bad cartoon, his complexion was just horrid.

Honestly, I believe this entire fiasco was arranged solely to let the equipment manufacturers, cable and satellite companies and the govt make more money from us! The sad and sick part about it is that is was MANDATED when there really was no pressing need for it -- other than to line someone else's pockets.
 

Lee

DTVUSA Jr. Member
#6
It sounds to me like you may have a bad converter box. There have been reports of "lemon" converter boxes that don't work right out of the box. Have you tried connecting the same unit that's giving you the moire problem, to a different TV? Better yet, you may want to try connecting that Tivax unit to the 32" TV without going through the VCR just to confirm that it isn't the VCR giving you the problem.

It's almost like troubleshooting a tech problem with a computer. You have to start from the ground up, hehe.
Good idea. I will try this converter on another TV and see if I am getting the same hiss.

Also, it now occurs to me that maybe it's the TV or RF cable. (See my post reply to Jay above - I fixed the visual interference.) Maybe that squished end of the RF cable for that big TV is causing the hiss?

Yes, I guess doing a direct connection to the TV would be a good test too. I just hate the idea of muscling that thing around in the armoire, so heavy! But you're right, the VCR needs to be eliminated as the possible source of the problem and bypassing it would confirm/deny that theory.

Thanks for your ideas.
 

Jason Fritz

Administrator
Staff member
#7
Hey Lee,
that was my mistake on the RF Modulator! You still may want to try setting the converter box to Mono just to see if it clears up the buzzing noise.

Actually, I think that maybe I should get an antenna splitter so I can split the RF line into 2 -- one to the VCR and one to the 32" TV.
IF you went with this route, you wouldn't need to buy a 2nd converter (one for the tv, one for the vcr), unless you want to be able to watch one channel, and record another channel at the same time. If you want that capability, then you would have to purchase a 2nd converter box.

...I believe this entire fiasco was arranged solely to let the equipment manufacturers, cable and satellite companies...
Check out this story... Move to digital TV could cost some cable customers

Thanks for keeping us updated Lee!
 

Lee

DTVUSA Jr. Member
#8
Hi Jay,

Thanks again for the feedback. I did get a splitter although I haven't installed it yet. Hate crawling around with all that wiring :)

As for setting the converter box to mono, there is no such option on the Tivax. I'm assuming you mean stereo/mono switch or something like that? I see no switch on the back and nothing in the onscreen menu.

I've readjusted the connections multiple times and the hissing is really terrible. I guess I'll have to swap out the box to another TV and see if it does that there too so I know if I should return it.

This is all just so annoying, one more thing on the list of things no one wants to do. BTW I'm not surprised at the article at the link. This was all orchestrated, surely, by lobbyists for those who will profit from this change. Sure, there are a couple "advantages" for the public (additional channels) but it's the fact that the only way we get the advantage is to pay through the nose for it that really bothers me. Big corrupt govt, what a curse...
 

Lee

DTVUSA Jr. Member
#9
Replying to myself....

Well, after posting the above, I googled hissing dtv converter and found this thread at consumer reports:

Issues with Dish's DTVPal DTV converters?: Consumer Reports Electronics Blog

If you scroll down three comments and read the one by DW, he talks about hiss being related to low audio signal.

Well, bingo, one of the things that maddens me about this converter is now I need to use THREE remotes to run my TV: the TV remote and the VCR remote to power them up and the DTV remote to control it. I had initially set the TV volume fairly low because I'm a night owl and when I watch at night, I keep it quiet for the rest of the family sleeping. Then during normal viewing hours, I'd turn up the volume using the converter.

So I decided to fiddle with the volume settings. I reset the volume higher on the TV remote (to exactly one half volume) and then adjusted it via the converter remote (also to about one half volume) and voila -- the hiss has receded A LOT! Enough that it is definitely something we can live with. I am now able to get the sound low enough that it won't bother others late at night and I can also get it loud enough that you can hear it well in the noiseiest situations we have.

So that was the fix for me. I will say that it's still going to be a problem, a reduction in quality when the time comes to watch a great concert or other music on TV. At those times, I like to crank the volume up and rock out. That is not going to happen using these settings. And if I try to increase the volume on the TV in order to make it louder, the hiss returns. So it seems the only workable volume is half for both TV and converter and we will lose a lot of the maximum volume range we had with just the TV.

We don't have our TV connected to the audio setup and don't have "home theater" -- those options sound nice but honestly, I don't want to do any more cable connections. So instead our TV is pretty high end with great speakers and settings to give really wonderful output even at high volume levels. I'd estimate we lose about a third of that volume capability with this converter box.
 

Jason Fritz

Administrator
Staff member
#10
Lee,
great stuff there, thanks for the update and info! I'm sure it's going to be useful for a lot of people trying to troubleshoot their converter box. Have you noticed any noise with the other Tivax STB-T9 on your other TV?
 

Lee

DTVUSA Jr. Member
#11
Good question, Jay. There is a very tiny amount but it's really barely discernable (sp?) . That 20" Panasonic got hooked up first and the good quality video and sound on it with the Tivax is what motivated me to get going on hooking up the large TV (the one mired in all those wires inside that armoire, the one I would prefer to procrastinate on :) .

It wasn't until after I hooked up the large JVC TV and had the terrible hissing problem that I took the time to test for hissing on the Panasonic. I played with the volume on the Panasonic to see if it was affected too. It is affected to a very small extent. You really have to listen hard to hear the tiny background hiss and it's only there when I set the TV volume quite low and then crank up the volume using the Tivax remote, exactly the scenario in that thread I mentioned: low audio signal input. Still on that tv there is much more flexibility in how loud the volume on the TV can be set and still be "almost" perfectly clear at any volume using the Tivax converter. I can set it anywhere from about 35% to 85% on the TV and be fine.

By contrast, on the large JVC, anything lower than that 50% volume on the TV gives audio that is just not acceptable due to the hissing. My conclusion is that different TVs will respond differently due to how their audio is handled or processed. Of course, to really test that theory, I'd have to switch the converters and see if it was the same. I have a hunch it would be but I really don't want to switch those boxes.

Hope this can help someone else...
 

Aaron62

Contributor
Staff member
#12
That is soo weird, it has to be something with the built in RF modulator on that Tivax unit. It's great that you have two different TVs to compare it on.
 
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