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Appendix

Appendix

Dronfield                                                           OS Grid Ref SK 362 791

Note, as work takes place on various digital transmitters (to prepare for the DSO) you may
experience problems, e.g. with certain MUXES disappearing. First try rescanning your
TV / set top box (do it manually if possible), but if this fails to work check on transmitter work
or call the reception advice phone numbers.   Also see basic digital fault finding.

Switchover at Dronfield is due to occur between the 10 and the 24 of Aug 2011.

Dronfield television transmitter started broadcasting in 1984. It is a 3W (C/D group)
Horizontally polarised relay (or repeater) off Emley via Chesterfield. The latter is a 2kW repeater which is Vertically. The fact that Dronfield is Horizontal is the opposite of usual practice for a repeater and the only reason I can think of for this is possible co-channel with Nottingham transmitter, or even Stanton Moor ?
This use of differing polarities is to take advantage of “cross polar rejection” to minimise
co-channel interference. Only the basic 4 television channels are broadcast, i.e. no C5 or
Digital TV though this is due to change in August 2011 when the DSO occurs.
Note that only the three basic PSB MUXES will be transmitted from Dronfield, not all six.
However, post DSO its 3 digital MUXES will be within its original C/D group.
This particular mast is quite difficult to find as its in the grounds of a school, and is hidden from Falcon Rd (which runs behind it) by trees.
The area around here can be problematic for Digital reception. This is partly  because Chesterfield doesn`t seem to put out much power in this direction
but also because 5 of the 6 MUXs are on exactly the same channels as Emley Moor
(see Transmitter Channel Allocations) which gives rise to co-channel interference.
Those who live in areas which can pick up both transmitters may have to be careful where
they site their aerial in order to try and “shield” it from the unwanted transmissions.

Click here for Dronfield transmitter`s radiation pattern

Dronfield is probably the dividing point between The Midlands and The North. The difference
in accents between Sheffield (just North of Dronfield) and Chesterfield (which is just South)
is probably as big as anywhere else in the country over such a short distance.

External Links

Dronfield transmitter at MB21
Digital UK details of Yorkshire transmitters
Ofcom Yorkshire transmitters details
Dronfield Repeater Transmitters Log Periodics
Close up of the Dronfield repeater`s array of receiving and transmitting aerials.
Note the use of Log periodic aerials as sold and installed by ourselves.
The four antennas at the bottom are in a phased array to receive the best possible signal from Chesterfield transmitter. The latter originally gets it`s signal
from Emley Moor.
After being remodulated
onto four different
frequencies (see the Transmitter Channel Allocations guide)
It is amplified and retransmitted from the top two Log antennas.

Picture Justin Smith ATV

Dronfield TV transmitter, hidden behind the bushes.

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