Interference on terrestrial channels?

IamNotNumber

At first I thought God was talking to me through my TV:pac:
A voice reading scriptures interferes with my terrestrial channels on a fairly regular basis ( other channels e.g UTV,BBC,E4 etc unaffected). The picture freezes and the sermons begin.I captured a video of my weather forecast being interrupted this evening.

https://www.youtube.com/watch?v=EHcsLRu4QxY

The provider is sky satellite.Any ideas where its coming from and how to stop it?

philstar

yep, the saoirview channels seem to be freezing for a second or two the last few nights

lertsnim

philstar wrote: »

yep, the saoirview channels seem to be freezing for a second or two the last few nights

No problems with Saorview here.

IamNotNumber

This is coming in with the sky service.Chatting to a few people and one suggestion is that someone nearby is transmitting this. I might ask Sky themselves.

muffler

Try their Talk To forum. They normally ask for you to send them a PM with contact details and they'll call you right back

winston_1

Have you got a church nearby that broadcasts services over CB frequencies? Could be breakthrough due to a strong signal overloading the TV front end or an aerial amplifier.

A high pass filter such as this before any aerial amplifier should cure it if that is the problem:

http://www.ebay.co.uk/itm/HIGH-PASS-TVI-FILTER-with-Braid-Breaker-CB-Amateur-PMR-Taxi-interference-/231048664110?pt=UK_Mobile_Phones_Communication_Radio_Parts_Accessories&hash=item35cb92d42e

Here is a list of church stations. Scroll down to the 8th page, Church of the Immaculate Conception and St. Killian which is located in D22 near you:

http://www.udxf.nl/WPAS%20List%20December%202014.pdf

IamNotNumber

winston_1 wrote: »

Have you got a church nearby that broadcasts services over CB frequencies? Could be breakthrough due to a strong signal overloading then TV front end or an aerial amplifier.

A high pass filter such as this before any aerial amplifier should cure it if that is the problem:

http://www.ebay.co.uk/itm/HIGH-PASS-TVI-FILTER-with-Braid-Breaker-CB-Amateur-PMR-Taxi-interference-/231048664110?pt=UK_Mobile_Phones_Communication_Radio_Parts_Accessories&hash=item35cb92d42e

Yes Saggart Church is a stones throw away ..I think you nailed it!

Thurston?

That stuff is unlike any Irish church service I've ever heard (not that I'm particularly experienced in that area). And it's interfering with RTE via satellite?

OP, are you sure you're not just pulling our legs here?

IamNotNumber

Thurston? wrote: »

That stuff is unlike any Irish church service I've ever heard (not that I'm particularly experienced in that area). And it's interfering with RTE via satellite?

OP, are you sure you're not just pulling our legs here?

Its Christian scripture ..always the same kind of hell-fire stuff..happens regularly no leg pulling!! I reckon it has to be the Church but yes its not the kind of stuff you hear at Mass on Sunday.I have a sky set top box from the landlord who lives next door..must ask does it happen to his tv.

winston_1

Thurston? wrote: »

And it's interfering with RTE via satellite?

No, terrestrial. To quote the OP:

A voice reading scriptures interferes with my terrestrial channels on a fairly regular basis ( other channels e.g UTV,BBC,E4 etc unaffected).

Satellite unaffected.

Thurston?

IamNotNumber wrote: »

... I have a sky set top box from the landlord who lives next door..must ask does it happen to his tv.

Do you have a Sky subscription? That's the only way you'd be getting RTE on a Sky box.

IamNotNumber

Thurston? wrote: »

Do you have a Sky subscription? That's the only way you'd be getting RTE on a Sky box.

Well there are two dishes outside one is for Sky and one for saorview maybe?.As I say I am renting and just pay the landlord a few quid extra.He pays the subscription.Starting to question the Church theory.Would they have a license to broadcast?. I do know of the God channel on Sky but its not that but could be one of the other similar ones or radio maybe.Anyway's didn't happen this evening and sometimes I will listen to it ..its makes me laugh!

winston_1

IamNotNumber wrote: »

Well there are two dishes outside one is for Sky and one for saorview maybe?.As I say I am renting and just pay the landlord a few quid extra.He pays the subscription.Starting to question the Church theory.Would they have a license to broadcast?. I do know of the God channel on Sky but its not that but could be one of the other similar ones or radio maybe.Anyway's didn't happen this evening and sometimes I will listen to it ..its makes me laugh!

One is not for saorview as saorview is a terrestrial service via an aerial. If the landlord is providing it there is probably a distribution amplifier that is being overloaded by the nearby WPAS church transmission.

These church transmissions are licensed under the Wireless Public Address service, see my prievous link.

Do you get the Irish channels by selecting them on a sky box or do you select them as a direct channel on your TV?

Thurston?

IamNotNumber wrote: »

Well there are two dishes outside one is for Sky and one for saorview maybe?

Saorview doesn't use a satellite dish. A photo of the 'Sky' box might be useful.

Fuzzy Clam

WPAS is analogue. If there was interference to the Saorview or Satellite signal, both digital,you won't hear it. A poorly screened scart lead might pick up interference but it won't be anyway as loud as in the video.
That doesn't sound like a church system anyway. It sounds more like a satellite broadcast God station.

Cerco

A strong terrestrial signal can interfere with a signal from a satellite through a process called intermodulation. This could happen in the sat receiver if the interfering signal is strong enough.
Op check all your cables are securely fitted and in particular the cable screens are tight in the connectors.

winston_1

Fuzzy Clam wrote: »

WPAS is analogue. If there was interference to the Saorview or Satellite signal, both digital,you won't hear it. A poorly screened scart lead might pick up interference but it won't be anyway as loud as in the video.
That doesn't sound like a church system anyway. It sounds more like a satellite broadcast God station.

OK. If it is coming via a sky box the strong analogue signals could be getting into the sky box and demodulated somewhere in the audio stages then amplified.

It would be useful if the OP could pop round to the local church next time it happens to see if such a sermons is happening.

Fuzzy Clam

winston_1 wrote: »

OK. If it is coming via a sky box the strong analogue signals could be getting into the sky box and demodulated somewhere in the audio stages then amplified.

It would be useful if the OP could pop round to the local church next time it happens to see if such a sermons is happening.

Listen to it again. It is clearly not a local church.
It is a fault on the OPs equipment. Possibly a faulty or poorly attached cable.
Without knowing exactly the setup, what set top boxes are used and how they are wired, its impossible to say what but to me it sounds like the audio from a satellite tv or radio channel.
I would check and maybe replace any interconnecting leads, esp scarts.

Antenna

IamNotNumber wrote: »

At first I thought God was talking to me through my TV:pac:
A voice reading scriptures interferes with my terrestrial channels on a fairly regular basis ( other channels e.g UTV,BBC,E4 etc unaffected). The picture freezes and the sermons begin.I captured a video of my weather forecast being interrupted this evening.

https://www.youtube.com/watch?v=EHcsLRu4QxY

The provider is sky satellite.Any ideas where its coming from and how to stop it?

could you put up another video of this happening with you then changing to another channel and back to RTE1 again ?
Its too easy to 'stage' what is on that video and Thurston? (and me, and no doubt others) were understandably skeptical .

Cerco wrote: »

A strong terrestrial signal can interfere with a signal from a satellite through a process called intermodulation. This could happen in the sat receiver if the interfering signal is strong enough.
Op check all your cables are securely fitted and in particular the cable screens are tight in the connectors.

There are going to be no strong terrestrial signals entering the satellite tuner, a satellite LNB is not going to function at 27MHz/VHF/UHF and anyway a digital satellite receiver is not going to decode the audio of an analogue transmission or other digital signals be it DAB, DVB-T or whatever..
When you say intermodulation you are probably thinking of issues with setups with equipment with UHF modulators where two strong signals could mix together and interfere on other channels, say with a VCR modulator on Ch36 and a satellite modulator on Ch 39 , say 3 channels part, interference could happen another 3 channels above 39 (ch 42) and 3 channels below 36 (Ch 33) in the former of pattering in the case of analogue. Some call it "leapfrog mixing".


I do have one possible explanation if genuine - a intermittent fault with the High/low band switching of the LNB might result in another transponder being
received.

I assume the audio APID would have to match to hear the audio of another channel if this happened ?

consulting

http://en.kingofsat.net/pos-28.2E.php

the audio PID (APID) of RTE1 is 2307, searching for 2307 the religious radio channel called UCB Bible is also 2307, which is currently on 2 transponders for some reason. Whats notable is that if the LNB when switched to highband when it should be lowband, doing a bit math, the resulting frequency is only a bit off tune from a transponder carring UCB Bible

RTEs on 10744.00 H so IF (10744-9750) = 994 MHz
if LNB went high (10600 Local Osc) instead of low (9750 Local Osc) when receiver on 994 MHz, 994MHz + 10600 = 11594 MHz - just 9MHz away (considering the wide channel bandwidth used for satellite)
from 11585 H which currently has UCB radio (including UCB Bible)

read http://en.wikipedia.org/wiki/Low-noise_block_downconverter

IamNotNumber

Antenna wrote: »

could you put up another video of this happening with you then changing to another channel and back to RTE1 again ?
Its too easy to 'stage' what is on that video and Thurston? (and me, and no doubt others) were understandably skeptical .

Yes if it happens again I will certainly record it,but take my word for it its not staged.
Also my reception on all the channels is perfect most of the time.I doubt its down to faulty cables. The mystery deepens!

winston_1

Antennas calculations aside I really don't think it is another satellite channel. The intermittency of this suggests an occasional strong nearby transmission getting in via the connecting cables rather than the LNB.

Antenna

winston_1 wrote: »

Antennas calculations aside I really don't think it is another satellite channel. The intermittency of this suggests an occasional strong nearby transmission getting in via the connecting cables rather than the LNB.

On that video the TV picture is frozen and the audio is completely taken over by the other channel (rather than hearing a mixture of both). It is not characteristic of either a poorly screened HDMI or SCART cable picking up interference.

The first bit of detective work should have been to check if the audio matches that of any of the religious TV and radio stations on the EPG,
and as above I have reason to suspect its UCB Bible radio on Sky EPG 0134 ... http://www.ucb.co.uk/listen/bible.html

Rippy

Antenna wrote: »

On that video the TV picture is frozen and the audio is completely taken over by the other channel (rather than hearing a mixture of both). It is not characteristic of either a poorly screened HDMI or SCART cable picking up interference.

The first bit of detective work should have been to check if the audio matches that of any of the religious TV and radio stations on the EPG,
and as above I have reason to suspect its UCB Bible radio on Sky EPG 0134 ... http://www.ucb.co.uk/listen/bible.html

This is correct . I came across exactly the same problem a couple of weeks ago , religious audio over a frozen rte 1 picture . I suspected a faulty lnb and changed it but the problem returned . Turned out to be voltage drop over a very long run with an inline amplifier , the spectrum analizer showed both vertical transponder rising periodically . Amp was changed , all connections redone and problem sorted , at least for now

IamNotNumber

Hasn't happen again since although the picture did start freezing the last evening but no audio. I noticed that the coaxials are not crimped at all..merely the copper is pushed into the sockets :pac:
Anyway's thanks for all the info posters!

Antenna

IamNotNumber wrote: »

Hasn't happen again since although the picture did start freezing the last evening but no audio.

looking up the online lists 'UCB Bible' (and other UCB radio stations) are no longer on the transponder/frequency (gone from 11585 H - now on 12545 H only) your LNB was falsely picking up by High/Low band switching being wrong , so the effect of hearing that radio station as described is gone. 11585 H now home to only encrypted TV channels so the possibility of hearing other audio with that fault is now gone. As you are still getting freeezing on RTE as you describe, the fault is still there .

At first it was difficult to believe the video you posted, until it was realised it had to be due to a faulty satellite receiver/LNB jumping to near enough another transponder frequency!