Re: Old boxes hit by West Mids Freeview change

In article <pfidneLM3a35r9rVRVnyhAA@plusnet>, Mallory <i.want.spam@xxxxxxx>
wrote:
RH is fairly poor in the village, and those having to use it show
unserved on the DTTV predictor. Most new installations on that side of
the village are using Malvern, but my friends wanted to keep analogue
Five as well as having DTTV (three TV's, but only one Freeview box -
through choice.) They are receiving good analogue and Freeview with a
22db masthead amp. Their analogue Five co-channels with Wrekin though
and aerial positioning was critical.

I've installed two aerials on two houses in a village near Kidderminster.

[Snip]

Who in their right mind puts a TV station on the same frequency on two
adjacent main TV transmitters,

If you recall, Channel 5 was squeezed in to an already full uhf spectrum.
There were compromises, this is one of them. The alternative was probably
no ch5 on one of the transmitters. In any case the village you are dealing
with is presumably outside the defined service area of either transmitter -
you mention best signals come from Malvern - so coverage of either main
station there wouldn't have been considered.



particularly when you consider the village
I was working in as Ridge Hill and the Wrekin were exactly 180º apart,
and even using Bill Wrights trick of a pair of aerials in a phasing
array would not worked..... I was using aerials that have a high front
to back ratio, that was not sufficient to null out the interfering Ch 5
signal from the unwanted transmitter.

So, what sort of aerial? And why wouldn't a phased pair (or even 4) have
worked? The only ones with a really good f/b ratio are log periodics
although grid types are a close second. All yagis have random rear lobes
(bunches of bananas) which are vary across the bandwidth of the aerial.

--
From KT24 - in "Leafy Surrey"

Using a RISC OS computer running v5.11

.

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