some saoirview channels missing

mikedoherty99

I can only get RTE 1,UTV Ireland and rte junior

I have 3 tvs and have tried a retune but that's all that comes up,I had rte2 and tv3 previously

The aerial feed goes through an amp and into an old sky box,from there it is split off to 3 tvs

Any ideas what the problem might be thanks

The Cush

Those 3 channels are carried on the same frequency/multiplex, the missing channels are carried on the other frequency/multiplex. A missing mux would indicate the signal is below the required level for that frequency. That could indicate a problem with the aerial/cabling/etc.

Can you bypass the Sky box and test the aerial feed directly to the TVs?

mikedoherty99

The Cush wrote: »

Those 3 channels are carried on the same frequency/multiplex, the missing channels are carried on the other frequency/multiplex. A missing mux would indicate the signal is below the required level for that frequency. That could indicate a problem with the aerial/cabling/etc.

Can you bypass the Sky box and test the aerial feed directly to the TVs?

Will do that

mikedoherty99

mikedoherty99 wrote: »

Will do that

The channels are on now but the signal strength is low

The Cush

Where is the amp located?
Have you checked all the physical connections as far back as the aerial?

If the amp is working properly and the connections OK the problem could lay with the aerial, location/alignment, where is the aerial?

The Cush

One further check I'd do is bypass the amp also and run the feed direct to each TV and check the signal level and signal quality if possible and also with the feed connected to the Sky box and distributed as before to all TVs.

mikedoherty99

The Cush wrote: »

One further check I'd do is bypass the amp also and run the feed direct to each TV and check the signal level and signal quality if possible and also with the feed connected to the Sky box and distributed as before to all TVs.

OK ,I'll check all the physical connections

The amp is beside sky box ,the aeriel cable passes through it into rf-in on sky box,rf-out on sky box feeds a splitter to 3 tvs

Aeriel is on roof outside


Does saoirview work without the amp?

The Cush

mikedoherty99 wrote: »

The amp is beside sky box ,the aeriel cable passes through it into rf-in on sky box,rf-out on sky box feeds a splitter to 3 tvs

Aeriel is on roof outside


Does saoirview work without the amp?

OK, the amp beside Sky box is useless, if required it should as close to the aerial as possible to compensate for any losses down the cable to the TV. In most cases with a properly installed aerial and in a normal reception area an amp shouldn't be required.

An amp might be required if you're feeding a number of TV points around the house (after the Sky box).

First thing I'd do is remove the amp and connect the aerial directly to the TV and check the signal levels.

If the signal is OK at the TV I'd connect the aerial directly to the Sky box and distribute the signal as before and check the signal levels at all TVs. If the remote TV are still not good I'd fit the amp after the Sky box and then check again.

Can you post make and model of the amp or post pic?

Thurston?

Maybe the 'amp' at the Sky box is just a power supply.

mikedoherty99

The Cush wrote: »

OK, the amp beside Sky box is useless, if required it should as close to the aerial as possible to compensate for any losses down the cable to the TV. In most cases with a properly installed aerial and in a normal reception area an amp shouldn't be required.

An amp might be required if you're feeding a number of TV points around the house (after the Sky box).

First thing I'd do is remove the amp and connect the aerial directly to the TV and check the signal levels.

If the signal is OK at the TV I'd connect the aerial directly to the Sky box and distribute the signal as before and check the signal levels at all TVs. If the remote TV are still not good I'd fit the amp after the Sky box and then check again.

Can you post make and model of the amp or post pic?

Thanks, I'll do all this later and report back

The Cush

Thurston? wrote: »

Maybe the 'amp' at the Sky box is just a power supply.

Thinking the same, that's the reason I asked about make/model/pic of the amp in the previous post.

@ mikedoherty99 - ensure the Sky box RF output UHF frequency/channel is the same as one of the Saorview frequencies which would result in a conflict and no TV channels.

mikedoherty99

The Cush wrote: »

Thinking the same, that's the reason I asked about make/model/pic of the amp in the previous post.

@ mikedoherty99 - ensure the Sky box RF output UHF frequency/channel is the same as one of the Saorview frequencies which would result in a conflict and no TV channels.

It's an amp
Would it be a legacy amp from the old deflector system,presumably not needed for DTV?

Thurston?

mikedoherty99 wrote: »

It's an amp

Are you sure? Makes no sense having it before the Sky box, as it would only be amplifying the signal from the aerial, with the RF output from the Sky box suffering whatever losses come from splitting.

It would only make sense if it's actually the power supply for a 'masthead' amplifier, with the amplifier itself closer to the aerial.

The Cush

Thurston? wrote: »

Are you sure? Makes no sense having it before the Sky box, as it would only be amplifying the signal from the aerial, with the RF output from the Sky box suffering whatever losses come from splitting.

It would only make sense if it's actually the power supply for a 'masthead' amplifier, with the amplifier itself closer to the aerial.

Unless it was there before the Sky box was installed.

mikedoherty99

picture

Thurston?

That's almost certainly just a power supply, see where it says '12V out' at the 'aerial in' connection.

See if there is a small plastic box outside near the aerial: this will contain the amplifier. (Outside at the 'masthead' being the most likely location, & where it will do most good.)

mikedoherty99

i think the power supply is FUBAR

unfortunately i lost all channels after moving it about,all connections were sound

it's a triax TP 1285 power unit

The Cush

mikedoherty99 wrote: »

i think the power supply is FUBAR

unfortunately i lost all channels after moving it about,all connections were sound

Could be the amp on the mast also, it's been exposed to the elements over the years.

Have you disconnected the power supply and tested for a feed from the aerial direct to the TV?

If you're replacing the power supply this Proception power supply will replace the Triax TP1285 - https://www.blake-uk.com/power-supplies-regulated-and-unregulated-12v/278-psu-for-amplifiers-and-boosters-12v-100-ma-power-supply-screened-with-type-f-connectors-power-supplies-proception.html, should be available locally or online, connection is via F-connector.

mikedoherty99

http://www.amazon.co.uk/Antiference-PSF200-Power-Supply-Unit/dp/B00AE4X2RU/ref=sr_1_2?ie=UTF8&qid=1443003610&sr=8-2&keywords=masthead+power+supply


Will this do as a replacement?

Is it just 12v 10mA i need and does the connector type matter much? thanks

The Cush

mikedoherty99 wrote: »

Will this do as a replacement?

Is it just 12v 10mA i need and does the connector type matter much? thanks

It's 12v 100mA, so it should be OK. No, the connector type doesn't make much difference, most units today come with secure f-connectors.