Why wideband aerial

The older it is the, more likely to be a grouped aerial. Thirty years ago very few widebands were fitted, though I assume any DIY shed aerial must have been one. Either that, or you live next to the transmitter! A grouped aerial may not give any significant signal at all outside of its band. Notes : The dates of and for the changes in the groups are approximate. Channel 5 began transmission on the 30th of March , but planning for this had started years before this.

A helpful contact in the aerial industry has informed me that the extending of the aerial groups was being undertaken 18 months to two years before the actual launch of C5, giving One should always remember that grouped aerials frequency responses are approximate anyway , very approximate!

For instance, an E group is really a wideband with an emphasis on the top end frequencies. The K group needs clarification as well, particularly post switchover when there are a significant number of K group transmitters. Well more or less, because the esoteric "temporary" HD MUXES 7 and 8 will be transmitted on CHs 55 and 56, so for those who want those channels a wideband or Yagi18K which works higher up the band than other K groups would be required. The B group and the E group , were also extended down to CH35 from CH39 around when the planning for C5 transmissions from was beginning.

At this same time group A was extended up from CH34 to CH37 because some group A transmitters Crystal Palace being the most obvious example were having to transmit C5 on CH37, though somewhat confusingly, in the case of Crystal Palace, it was actually transmitted from Croydon! It must be said that extending aerial groups down a few channels is usually a bit irrelevant because Yagi antennas generally work pretty well below their designed for bands although some Contract type aerials [and some others without Baluns?

Well perhaps a little. My wife reckons all men have autistic tendencies and I think she could be right. The question is, can you actually be autistic if you take the mickey out of yourself for being autistic? Addition of the T group : The latest but quite possibly not the last change to the aerial groups is the addition of the T group in This is effectively a truncated wideband which is a first in that up to now, in our little history lesson, all has been about extending not truncating!

Anyway, this pruning of the wideband is to allow for the fact that from July onwards there are no TV transmissions over CH That part of the spectrum having been sold off for 4G mobile phone use.

This is particularly the case when the filters are free from at! In October Ofcom confirmed that the MHz clearance would take place, by the second quarter of That is to say clearing all TV transmissions between CHs 49 and Check out the OMNI-C fractal antenna for a practical, inherently frequency independent by its geometry, no matching network required, wideband antenna. Antennas for the communities Cyntony serves, mean very wide frequency ranges must be delivered.

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