Phone Interfers With Sky

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nathan23h

35 posts

Geek

#36148 20-Jun-2009 13:40

Hi Guys,

Have some channels on SKY which don't work, when i turn the phone off at the wall they work fine.

My understanding is that SKY is on the 2.4GHZ frequency and my phone is on the 1.8GHZ but still effects it.

I had a really old brick like cordless phone i tried and it didn't effect SKY at all but i can't see anywhere what frequency it was on.

Is there a fix for this issue?

Thanks

Wizzid

51 posts

Master Geek

Lifetime subscriber

#226995 20-Jun-2009 13:52

To my knowledge, only by moving the telephone base station and the handset (both) further away from the sky receiver is the only way to reduce interference

Spyware

3764 posts

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Lifetime subscriber

#226996 20-Jun-2009 13:55

Your understanding is quite simplistic and basically wrong. Sky's satellite transmissions are between 12 and 13 GHz. A local oscillator (the LNB) of 11.3 or 10.75 GHz then beats against this frequency to produce a signal between 950 MHz and 2150 MHz down the RG6 coax. Depending on the intermediate frequency (IF) in the set top box it will have an oscillator that will have a frequency similar to your phone depending on Sky channel.

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nathan23h

35 posts

Geek

#227005 20-Jun-2009 14:41

Spyware: Your understanding is quite simplistic and basically wrong. Sky's satellite transmissions are between 12 and 13 GHz. A local oscillator (the LNB) of 11.3 or 10.75 GHz then beats against this frequency to produce a signal between 950 MHz and 2150 MHz down the RG6 coax. Depending on the intermediate frequency (IF) in the set top box it will have an oscillator that will have a frequency similar to your phone depending on Sky channel.

Well thanks for your explaination..... is there a solution though?

Spyware

3764 posts

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Lifetime subscriber

#227013 20-Jun-2009 15:10

3 variables, LNB frequency (most likely a 10.75 GHz but may not be), set top box model and phone. First thing phone Sky and see what they are willing to do re: swapping box for different model.

WaffleMakerMan

138 posts

Master Geek

#227019 20-Jun-2009 16:37

I have a panasonic 1.8ghz phone that did the same thing, Moved the phone, no issues. If you can move it just do that :)

Perhaps this post could be stickied? there's been a couple of posts about phone interference

Byrned

455 posts

Ultimate Geek

#227021 20-Jun-2009 16:52

Had the same issue - had a sky tech come out with all different models of STB with no difference. Only thing that worked was moving the phone or buying a different one.

Now have a Uniden 5.8GHz jobby which works perfectly with everything :)

nathan23h

35 posts

Geek

#227187 21-Jun-2009 20:00

Cheers Guys, i have a 5.8GHZ phone at work so will bring it home to try. Hopfully that solves my problems

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Dingbatt

6756 posts

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#227533 22-Jun-2009 21:24

Just out of interest, is your sky box a Pace DSR 600 series?

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trig42

5814 posts

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#228890 28-Jun-2009 09:09

A little off topic, but related (I think).

I have MySky HDi, and a Bose Lifestyle DVD system. The Bose has an RF remote which I though was playing up/faulty as it wasn't always registering button pushes - very frustrating.
I went to the Bose store on Saturday and they lent me a new remote - which did exactly the same thing (and my remote worked perfectly in store - always the way!).

After fretting about how much it might cost to repair the Bose, my wife suggested moving it away from the MySky. I thought, whats the chance of that working, but remembered reading this post a couple of days ago and thought that if Sky decoders can interfere with cordless phones, surely they can interfere with RF remotes.

Upshot, moved Sky box yesterday, remote hasn't missed a beat since.

I don't imagine too many others are having this issue, but if it comes up on a google for anyone, it may save them some angst.

cyril7

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#228901 28-Jun-2009 10:15

Hi, the issue of DECT phones upsetting DVB-s recievers is quite different to your 430MHz Bose remote being interfered with by general CPU hash from the MySky.

Just to clarify, DECT phones operate in a section of the 1800-1900MHz band, if you have a 10750 LO LNB fitted on a Ku satellite installation (which pretty much Sky installs now do) then the LBand IF from the dish will be carrying some of the payload in that 1800-1900MHz band. If your DECT phone basestation has decided to use a channel that conicides with one of the Sky transponder channels and couples into the LBand downlead (coax), then there is potentially a problem, especially with certain STBs that use particular ZIF (Zero IF) tuners that are more prone.

The Bose remote I presume operates in the 430MHz band (was last I looked) its quite reasonable that the CPU (or general motherboard) of the MySky is producing enough hash at that band to upset the remote reciever, I noted a similar issue with a Media Center and a RF remote receiver only the other day. The recievers in these RF remotes are not that flash, so even though the source of the interference may well be within published limits if close enough its easy to swamp them.

Cyril

trig42

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#229076 29-Jun-2009 06:24

ahhh, that makes sense. It made a difference even when only seperated by about 15cm. The Bose unit was sitting directly on top (only a few of those rubber self-adhesive feet from mitre10 in between them to allow air flow) of the MySky.

Thanks.