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Saorview on the Mount Leinster (Republic of Ireland) transmitter

first published this on - UK Free TV
sa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps52.618,-6.780 or 52°37'6"N 6°46'47"W


The symbol shows the location of the Mount Leinster (Republic of Ireland) transmitter. The bright green areas shown where the signal from this transmitter is strong, dark green areas are poorer signals. Those parts shown in yellow may have interference on the same frequency from other masts.

This transmitter has no current reported problems

The BBC and Digital UK report there are no faults or engineering work on the Mount Leinster transmitter.

Choose from three options: ■ List by multiplex ■ List by channel number ■ List by channel name

Which Saorview channels does the Mount Leinster transmitter broadcast?

If you have any kind of Saorview fault, follow this Saorview reset procedure first.

Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.

 H max
C23 (490.0MHz)906mDTG-1003160,000W
Channel icons
3 Virgin Media 1, 4 TG4 (RoI), 21 RTÉ News Now, 22 Tithe an Oireachtais ,

 H max
C39 (618.0MHz)906mDTG-1003160,000W
Channel icons
1 RTÉ One HD, 5 Virgin Media 2 , 6 Virgin Media 3, 7 RTÉ jr, 11 RTÉ One +1, 12 RTÉ2+1, 27 Saorview Information (*,

DTG-1003 64QAM 8K 2/3 24.1Mb/s DVB-T MPEG4
H/V: aerial position (horizontal or vertical)

How will the Mount Leinster (Republic of Ireland) transmission frequencies change over time?


tv_off Being removed from Freeview (for 5G use) after November 2020 / June 2022 - more
Table shows multiplexes names see this article;
green background for transmission frequencies
Notes: + and - denote 166kHz offset; aerial group are shown as A B C/D E K W T
waves denotes analogue; digital switchover was 1 Jan 12 and 1 Jan 12.

How do the old analogue and currrent digital signal levels compare?

SV1≡, SV2≡ 160kW

Monday, 24 July 2023
Steve Donaldson

1:07 AM

Adam Jackson: In addition to that said by Chris.SE (see comments from him and me on the previous page), it appears you almost have line-of-sight to Divis at 186 miles on a bearing of 350 degrees. The only obstruction is Garn Fawr. Line-of-sight leaves Northern Ireland between Newcastle and Dundrum.

The bearing of Mt. Leinster is 300 degrees, give or take a degree. So Divis is 50 degrees clockwise. Thus, another possible suspect cause is Divis, and if it is then perhaps turning the horizontally polarised Mt. Leinster aerial a little anti-clockwise might help null it. That said, the signal may be weak and so it's possible you can't afford to turn the aerial off-beam (unlike I imagine the one for the Trefin relay).

If your difficulty is interference from Divis then this is all the more reason to check aerial manufacturers' polar diagrams, as Chris.SE says. Also, consider whether there is anywhere the aerial could be mounted which allows sight in the direction of Mt. Leinster but where there is something in the way of Divis.

Divis' PSBs are 27, 21 and 24 @ 100kW, and COMs 23, 26 and 30 @ 50kW. If you are so inclined to swing the horizontal aerial round to try it out, then be aware that Blaenplwyf's PSBs are co-channel on 27, 24 and 21, on a bearing of 59 degrees, with only the moors around Rhos-y-Caerau blocking line-of-sight. Blaenplwyf's COMs aren't co-channel with those of Divis.

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Steve Donaldson's 200 posts GB flag
Monday, 31 July 2023
Adam Jackson
9:31 PM

Thanks Steve and Chris for your comments. All very good information there for me to digest. I had seen that Carmel was boadcasting the same frequency as mount Leinster but considering I had been unable to tune into it in the past. I hadn't even considered it being an issue. I had tried tuning into it as I've never been able to pick up preseli here and tried seeing if I could get full Freeview from Carmel instead. There is a house about 400 metres from me that looks to be pointed at preseli but I have never had any luck.

I have bought a labgear masthead amplifier, installed after combining 1 aerial at Trefin and 1 at mount leinster with a splitter in reverse in the loft. This combined cable down into the back of the sky box. Rf2 from that back up into the loft into a labgear distribution amplifier to send sky, Freeview and Saorview around the house. Previously this had been done with passive splitters even though I knew there would be some loss in gain. I had never used amplifiers in the past because i had read they could be more bad than good.

Just using my Humax HDR-FOX T2's signal detector as a guide. My signals have increased dramatically.

Ch22 28%
Ch23 42%
Ch25 46%
Ch26 40%
Ch28 60%

Ch22 81%
Ch23 85%
Ch25 87%
Ch26 85%
Ch28 96%

I'm going to have to see if I can pick up preseli now.

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Adam Jackson's 9 posts GB flag
Steve Donaldson

10:28 PM

Adam Jackson: With respect to reception from Preseli, this is made difficult due to several obstructions. Several of the Preseli Hills at 12 miles out are in the way. At about a mile out there is the quarry at Clegyrn. Immediately to the east of St. Nicholas is high ground and there is a gap where it drops down.

You can see these here:

United Kingdom topographic map, elevation, terrain

You can use this tool to draw a line between you and the transmitter:

Solwise - Surface Elevation Tool | Solwise Ltd

The height of Preseli transmitter is 235m, and you can enter this on the tool once a pin has been dropped.

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Steve Donaldson's 200 posts GB flag

11:34 PM

Adam Jackson:

Some great information there from Steve Donaldson (he's much better at that sort of thing than me!).

Those "after" signals look fine, but what is important is that your Quality figures are 100% when conditions are "normal".

Even though there a hills on a line of sight, it's always worth a punt because if signals are strong enough (at the aerial) they can be reasonably stable, though weather conditions can upset them more readily (that's without any tropo) !

Mountains on the line of sight are a different matter :o You may unfortunately find too much of Preseli top in the way unless you happen to find a gap from your location.

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Chris.SE's 4,130 posts GB flag
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