Digital Modulator HDMI in & out

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Dayle

3 posts

Wannabe Geek

#290793 5-Dec-2021 13:23

Can anyone give me instructions on how to programme a DVB-T modulator HDMI in and out unit so that external tv's can see a channel to tune into. It works perfectly on the main TV but when i try and tune in other TV's there is no signal. I am sure it's just in the modulator settings. It connects to Sky NZ set box and is feed to external tv's via coxial cable.

Thanks in advance

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Spyware

3762 posts

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#2824624 5-Dec-2021 15:08

DVB-T transmissions in NZ are typically 8K carriers, 64-QAM modulation, on 8 MHz wide channels with a coding rate of 3/4 and guard interval of 1/16. TV tuners are typically UHF only so set output channel on somewhere between 27 and 62 that doesn't hit your local transmissions, e.g., channel 50, or between 21 and 26.

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sbiddle

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Biddle Corp

Lifetime subscriber

#2824625 5-Dec-2021 15:19

If you're saying it works fine on one TV but not others it suggests a fault with the way you have it connected to your other TV's. How are you feeding this to the other TV's?

richms

28187 posts

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#2824633 5-Dec-2021 15:45

I typed a reply up before but it never showed so not sure what happened.

Anyway, I tried some cheap aliexpress DVB-T modulators a while back and not all will do LCN, and not all TVs will show channels without an LCN on them if they encounter channels when scanning that do use them, or else will put the modulators signal up on a really high channel (I think it was 700 or 800 or something) - basically without the LCN being sent it could end up anywhere so check the channel list on the TV to see if you see something else in there. Try doing a scan with only the modulator connected and no free to air antenna and see if you get different results.

Richard rich.ms

Dayle

3 posts

Wannabe Geek

#2824710 5-Dec-2021 17:37

The external tvs are connected by coaxial cable and channel changes occur via IR. So my setup at present on the modulator is HDMI in from Skybox, HDMI out to amplifier/Yamaha, RF out has the main aerial feed into it RF in is empty. I have changed the network ID from 13313 to 00101, the TS Id from 128 to 001 and LNC changed from 1 to 251. The RF setting has been changed from CH21 to CH42.

Dayle

3 posts

Wannabe Geek

#2824711 5-Dec-2021 17:38

PS the main tv is a 6 month old LG Oled and this works fine. The second TV is a new LG Oled and the others are a little older but all smart

MarkM536

309 posts

Ultimate Geek

#2824780 5-Dec-2021 20:59

Spyware:

DVB-T transmissions in NZ are typically 8K carriers, 64-QAM modulation, on 8 MHz wide channels with a coding rate of 3/4 and guard interval of 1/16. TV tuners are typically UHF only so set output channel on somewhere between 27 and 62 that doesn't hit your local transmissions, e.g., channel 50, or between 21 and 26.

I will give that a try myself tomorrow.

I have a similar looking unit which Lenkeng brand (one pictured looks to be a Dynamix branded replacement on PB?).

So far only my newer TV's have picked it up.

The two older ones can display a picture, but only if I change a setting on the modulator while that channel is being viewed. As soon as I change channel on the TV and go back, the image is black with just audio.

In testing with just the modulator connected to a signal TV; it worked perfectly fine. I'm wondering if I missed a setting and something clashed with another TV channel (over air) or my house wiring/amplifier is doing something weird.

lquify

158 posts

Master Geek

#2873173 23-Feb-2022 11:19

Both the Lenkeng and Dynamix Modulators will work straight out of the box with no need to change any settings.

The only thing you might want to change if you have a Samsung TV is the Network ID to 13000. This will stop newer Samsung TVs from requesting a re-tune every time you change the channel.
If you have a LG TV, change the ONID to 8000 to prevent a blank screen from time to time.

If you are running multiple modulators then there are further settings that need to be individualized.

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trig42

5813 posts

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#2873192 23-Feb-2022 11:27

So, from the RF out on the modulator, where does it go?

Into some sort of splitter, then to all the rest of the TVs?

Is the TV that is working connected to that splitter?

What happens if you disconnect the other legs from the splitter, and connect them one at a time to the RF-out on the modulator, do the other TVs work (one at a time).

Need to isolate the problem - is it your cabling, or a setting on the Modulator?

tb9

27 posts

Geek

#2875227 26-Feb-2022 10:40

lquify:

Both the Lenkeng and Dynamix Modulators will work straight out of the box with no need to change any settings.

The only thing you might want to change if you have a Samsung TV is the Network ID to 13000. This will stop newer Samsung TVs from requesting a re-tune every time you change the channel.
If you have a LG TV, change the ONID to 8000 to prevent a blank screen from time to time.

If you are running multiple modulators then there are further settings that need to be individualized.

I have exactly this problem with my Samsung TVs. My modulator is the Satlink WS6990. I’ve tried changing network ID to 13000, 13313, 8746, 08746 and none of them appear to get rid of the “The Broadcaster has changed the the signal information. A DTV Scan will start to update this information.” Any other suggestions?

daw654

9 posts

Wannabe Geek

#2899585 10-Apr-2022 19:17

lquify:

Both the Lenkeng and Dynamix Modulators will work straight out of the box with no need to change any settings.

The only thing you might want to change if you have a Samsung TV is the Network ID to 13000. This will stop newer Samsung TVs from requesting a re-tune every time you change the channel.
If you have a LG TV, change the ONID to 8000 to prevent a blank screen from time to time.

If you are running multiple modulators then there are further settings that need to be individualized.

I have the Dynamix one from PB tech and it works for the most part but every so often I will suddenly drop signal or become pixelated. I turn it off for a while and change the frequency and it fixes itself for a while before doing it again. Is it something I'm doing?

AKLGUY79

87 posts

Master Geek

#2992197 5-Nov-2022 12:48

Hi Crew.

Just looking at getting one of these for my home and then go down to 1 Skybox instead of 2.

We have a new splitter installed and all TVs come of that.

For the main family room if I get a new 3 way splitter and take one to the TV. Then one each to the RF in and RF Out ports. that will still send the signal through to the other TVs? And still get Freeview channels on the main TV

Or will it be best to get a 2way splitter and plug on into RF out and then one in to the TV?