colly0410 wrote:... When I lived in Bestwood Village near Nottingham we had a weird looking aerial, it was like a bent H, something a bit like this >-> where the top & bottom of the dipole & reflector were bent towards the transmitter, there was no band 3 part to it but it got ITV perfect..
GlowingAnode wrote:Were "X" aerials used because they could receive equally well horizontally and vertically polarised transmissions?
Niall wrote:I have dug out an X centre made by Aerialite.
This is the type where the coax centre is connected to the centre of one diagonal and the screen to the other.
I'm assuming that the rods would be 1/2 wave in total, i.e. 1/4 wave either side of centre.
So what we have is a pair of dipoles, one inverted with respect to the other?
Anyone have any info about theory of operation, likely performance figures etc.?
I am interested in trying it out on the Amateur 6 meter band.
I have tried an X beam on 11m many years ago but that was a conventional reflector / director arrangement.
Terrykc wrote:if you look back at the posts by colly0410 and Panrock you will see that they were only used with vertical polarisation.
Focus 2 wrote:BI folded dipoles, at least for our Channel 5, have been spotted however, such as the one I photographed in Hexham a few years back, see post #62 in the link. As a guess these were manufactured later, possibly 1970s installations?
http://www.vintage-radio.net/forum/show ... 777&page=4
Doz wrote: Bit like an HB9CV?
Focus 2 wrote:I seem to recall seeing a couple of horizontally polarised "X" aerials for the Grampian Durris transmitter in Perth....
colly0410 wrote:On the subject of baluns: I can't ever remember seeing a balun used on an aerial, neither of my UHF aerials (both in the loft) have got one nor my vertical FM dipole, just centre wire to one side & braid to t'other. How much signal would you lose by not using a balun?
nuvistor wrote:I thought the J Beam UHF aerials such as the MBM46 used a balun.
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