Sky modulator channels - low20's all have interfrance

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Leejrachj

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Wannabe Geek

#133601 27-Oct-2013 20:56

We recently moved house - the setup worked at the previous house about 15 km's away ! At this house I can get the picture and sound but it has interference (severe). Keen for ideas of other channels ir what might be causing it. We have sky HDI with a sky modulator to a tv in our bedroom. Any suggestions of what to try would be appreciated
Thanks

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#922715 27-Oct-2013 21:15

What location? That will let us know what channels does freeview use in your areas?

But basically, a modulator is putting a signal out in a band that others have paid a considerable sum for the rights to use, if you cant find a clear channel to operate it on, there isnt anything that anyone can really do.

If you do start to boost the signal up to overcome the interference you may then have it radiating over the top of the signals that are licensed on those frequencies and that is something that radio spectrum management tend to frown on.

Richard rich.ms

Leejrachj

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Wannabe Geek

#922723 27-Oct-2013 21:24

We just out of dunedin on the taieri near allanton, thanks for helping

richms

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#922732 27-Oct-2013 21:31

Hmm, there is listed as being the 32/34/36 channels, so the 20's should be free. Ive no idea what igloo is on down that way.

Are you mixing the modulator with off air antenna, or is it a direct run from the output of the modulator to the tv?

Richard rich.ms

B1GGLZ

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#922815 27-Oct-2013 22:33

Use Composite AV or Component/Audio cables instead. You'll get a much better picture. If you don't want to run more cables then get a Video Sender RF link which operates at much higher frequencies.
Are you sure it's in the low 20s? There never were any TV channels between 11 and 26 so I would think it unlikely the modulator would be in that frequency range which is not available for TV and would be illegal for that particular use.

richms

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#922817 27-Oct-2013 22:36

Another thought, it may be one of those aussie tuned modulators that jaycar were flicking off a while back, they had messed up numbering compared to anything local..

Richard rich.ms

Leejrachj

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Wannabe Geek

#922861 28-Oct-2013 05:23

I can select the modulator channel and I have tried 21-26 where I get the signal but it is interfered with. The sky technician installed this about 3 years ago at our old house on channels 24

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B1GGLZ

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#922874 28-Oct-2013 08:16

Once again, are you sure it's in the low 20s?
NZ TVs can't tune that range. Tuners are designed to tune the TV bands which are CH1-11 (VHF) and 26-62 (UHF). Try tuning analogue VHF and the whole UHF range. Most of the cheap modulators I've seen are in the CH1-3 area. Some are UHF around CH36. If it is around CH36 analogue you may have to alter it's frequency as it could be clashing with Freeview Digital on the same channel.

P.S. A picture or info about the modulator (make and markings) may help.

Leejrachj

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Wannabe Geek

#923141 28-Oct-2013 18:28

It's a sky RF modulator (not UHF my error) ASM6311

Leejrachj

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Wannabe Geek

#923143 28-Oct-2013 18:29

Hopefully that night make solving my problem easier

Thks people for your help

B1GGLZ

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#923155 28-Oct-2013 18:46

OK. Found some info and a picture of that online. Seems to be a UHF modulator and should be displaying the Channel it's set to on the front LEDs.
What channel does it show?

Leejrachj

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Wannabe Geek

#923160 28-Oct-2013 18:53

Tried 21,22,23,24,25,26,36,64 .... Tuned TV in but can't get a clear channel on the tv?

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richms

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#923173 28-Oct-2013 18:57

Have you checked that the cable is one continuous run from the modulator to the tv? Was the cable already installed or did you bring it with you? Any chance it has been stretched and the center wire has pulled back from the connector at one end?

Richard rich.ms

Leejrachj

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Wannabe Geek

#923175 28-Oct-2013 19:01

Cabling was done a few years ago. Before we moved in! Might need to get cabling checked

B1GGLZ

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#923176 28-Oct-2013 19:05

richms: Have you checked that the cable is one continuous run from the modulator to the tv? Was the cable already installed or did you bring it with you? Any chance it has been stretched and the center wire has pulled back from the connector at one end?

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Sounds like a fault with the cabling then.
Your local channels for Freeview and Igloo are 30, 32, 34, 36 so steer clear of them and your TV shouldn't be able to tune 21 - 25. Setting CH 38 or above and then tuning the TV to the same channel should be interference free unless there is a cabling problem. Can you take your TV to where the modulator is located and try a short cable?

richms

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#923177 28-Oct-2013 19:07

Have a visual look at the cable, if it uses crimped F connectors then adapters to the PAL plug like most sky installers use, unscrew the adapter and check for the center pin being there still. Often it is common for a cable to get yanked and the copper center core to disappear back into the cable. Snowy picture on everything would be quite likly something not touching but close enough for some signal to get across the gap.

Also see if you can trace the cable back, there may have been a splitter in it that the last owners decided to take with them and the cables are just beside each other, but close enough to couple some signal across.

Richard rich.ms

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