Jurby

Scotland · TV and FM

Position: 54.361120, -4.517814
Grid reference: SC36509910
Nation: Scotland
Ground height: 27 m
Antenna height: 35 m
Aerial group: Group B — C35–53, the middle
Polarisation: Vertical
BBC region: North West
ITV region: Granada
ITV news region: Granada
Parent transmitter: Douglas
Ofcom site number: 13763

The position is our conversion of Ofcom's grid reference SC36509910 from OSGB36 to WGS84 [V] — Ofcom publish none for television sites, and the transform reproduces their own radio coordinates to within 0.1 m on all 3,403 records that carry both.

How far it reaches

Two different questions, and the map below can be switched between them. Reaches is everywhere this mast puts a usable signal; strongest is the much smaller slice where nothing else does it better.

Band	Reaches	Strongest in
Television	1 of 238,895 Output Areas	nowhere	a relay, serving a local area
FM radio	54 of 238,895 Output Areas	nowhere	a relay, serving a local area

More detail

Most places can receive several transmitters — a median Output Area hears twelve — and only one of them can be the best, which is why the two columns are so far apart. Reach counts an area once the model clears the reception threshold there at all, and it inherits the sweep's screen: only the strongest twenty candidates per area are stored, so a mast lying twenty-first somewhere does not count as reaching it. Both are a share of areas, deliberately, and not a number of homes: checked against Ofcom's own coverage the model ranks transmitters correctly (Spearman 0.861) but over-states how far each one gets by a median factor of 2.5. A share is a ranking statement and survives that; a household count would not. How this is worked out.

On the map

Everywhere Jurby is predicted to reach for television and FM radio, shaded by how much signal is left over. Other transmitters reach most of this ground too.

Jurby is nowhere's strongest transmitter — normal for a relay, which fills in inside a main station's area rather than competing with it.

The lines are how far the signal is modelled to get: solid while the margin still clears 10 dB, dashed out to where it last clears 0 dB. The real edge sits inside them — every point inherits the model's measured optimism of about 17 dB.

How the rings were drawn

It is an envelope, not a boundary: terrain can still block reception well inside it, and it is an edge, not a fill — the colour says how far the signal gets, not that every spot under it works. Zoom in and the shading gives way to the per-area prediction, which is the same question answered Output Area by Output Area. The FM radio ring was contoured from the stored predictions, which keep only the strongest candidates for each area — the true edge can extend beyond what is drawn [I].

The modelled outer edge drawn above: FM radio about 78 km toward the east but barely beyond the mast toward the north-east [I].

Open this transmitter on the full mapreach, the aerial direction, and everything else within range

Television

Multiplexes transmitted from this site, as published by Ofcom.
Mux	Freeview name	Channel	Frequency	ERP	System	Operator
PSB1	BBC A	C46	674 MHz	40 W	DVB-T	BBC
PSB2	D3&4	C43	650 MHz	40 W	DVB-T	Digital 3&4 (ITV/Channel 4)
PSB3	BBC B	C40	626 MHz	40 W	DVB-T2	BBC

FM radio

FM services. ERP is published separately per polarisation; a dash means nothing is radiated in that plane.
Station	Frequency	ERP (H)	ERP (V)	Height	RDS name	PI code	Pattern
Manx Radio (FM)	103.7 MHz	2.0 kW	2.0 kW	50 m	MANX_FM_	C3BE	HV

Manx Radio (FM) — radiation pattern

Radiates most strongly toward the east (100°), as published by Ofcom.

More detail

Each ring is 10 dB of attenuation below the pattern's own peak; the outer rim is the peak itself and anything 30 dB down or deeper is drawn at the centre rather than off the edge of the chart, so a very deep null reads as “weak” and not as a hole in the picture. The shape says which direction radiates harder relative to the mast's own peak, not the absolute field strength there or how far it reaches — that is what the coverage map and the postcode lookup are for. Solid is horizontal polarisation, dashed is vertical.

Other transmitters nearby

Jurby Control Tower0.6 km SSW · FMKimmeragh8.5 km E · TVRamsey Town C9.4 km ESE · FMRamsey Town9.5 km ESE · FMRamsey Town B9.6 km ESE · FMRamsey10.4 km ESE · TV/DAB

Every structure Ofcom list within 40 km, nearest first. Close is not the same as an alternative: most of these are single-service relays, and one of them may radiate a thousandth of this mast's power in a direction that misses you.

Ofcom's notes

SFN with Beary Peark & Port St Mary.