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THE TRANSMISSION GALLERY
DEINIOLEN
| Photos by Martin Brown | Page last updated: 2022-08-10 |
| Since I visited Deiniolen in the drizzle in July 2016 both the UHF and FM receive aerials have been replaced. The UHF receive trough has been replaced with a panel. This is a consequence of the channel changes at Llanddona implemented due to 700 MHz band clearance. The band II receive log periodic has been changed from vertical to horizontal polarisation and the pointing angle changed slightly. This change is probably a consequence of Radio Wales replacing Radio 3 at Deiniolen and at most other BBC Welsh FM relays. |
| Sunshine and blue skies this time. |
| The new UHF receive panel aerial on the left. Right is one of the band II FM radio transmit dipoles. |
| The new UHF Rx panel with the other band II Tx dipole on the left. |
| The band II log periodic receive aerial now horizontally polarised. Note that the pointing angle is now about 10 degrees to the east of the direction of Llanddona. The tower face is oriented due north which happens to be the direction of Llanddona. My guess for the change of polarisation and pointing angle is to reduce potential co-channel interference to the reception of R.Wales on 94.8 MHz from Llanddona, which also happens to be transmitted at lower power. Most Irish FM stations are vertically polarised, so the potential CCI could be from there. A quick search reveals that Northern Sound from the Slieve Glah transmitter is on 94.8 MHz vertically polarised. I'm open to any other suggestions? Jack Richardson replies: I suspect interference is actually from Classic Hits 94.9 from Three Rock Mountain, the main Dublin Tx. I know a lot of the Dublin stations from Three Rock come in well around that part of the world, especially in Holyhead. They also come in well from that I remember on the Pass of Llanberis, so really not far from Deiniolen. |
| A clearer view of the band III DAB transmit dipoles and the UHF Tx panels remain unchanged. |
| The band II transmit dipoles which are only on the south and east faces of the tower. |
| The radome cover has been repaired on the DAB satellite receive dish. |
| Snowdon on the left with Llanberis beside the lake. |
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