One band I haven't tried from the beach is 6m. But with such great success on other bands, I think that come next summer, I should have a go.
One nice thing that's possible on 6m, where it isn't really on other, upper HF bands, is using a Yagi in a vertical configuration. This should provide really quite spectacular outcomes for DX paths from the coast, such as that to Japan. Due to convention and the lack of suitably-located operators, such vertical beams seem to be extremely rare.
I'm going to try some 6m Far East DX next summer... |
Let's see how this works out at 10m, which is a stock, 6-ele model provided in MMANA-GAL, simply for convenience; the general outcome will be much the same at 6m. First, the horizontal pattern, using an 8m mounting height, which is about the maximum we might reasonably achieve on a portable outing. Ground type is 'perfect', which is not too far from what we get with seawater:
And now, turning the beam on its side so that it's vertically polarised:
The difference between them is enormous at very low angles; we get 17dBi right down to the horizon, whereas the horizontal beam has a big gap starting below 15 degrees, falling away to very poor radiation at much lower angles.
To put this into context, a 5W input would come out as 250W. 10W as 500W, and so on.
Colleagues such as PE4BAS have a good track record of making JA QSOs with horizontal beams each summer. I never really put in enough effort, nor had a particularly good aspect towards JA from my last QTH. I hope to change that now.
Hopefully, I'll have a drive-on plate and modest mast and side arm to mount a vertical 6m Yagi done-up over the coming winter. Or maybe I'll try a rear-mount quad array, as supplied by Innovantennas? We'll see...
2 comments:
Just to be clear that, waht you show, is near water and at low (8m) height. Just like DXpedition use a VDA close to the water with excellent results. I think you have a point and hope to read some very interesting results next year. One big tip is to listen/view west at the greyline in the evening. It gave me some incredible contacts on 6m. 73, Bas
Hi Bas. Yes, by maybe even 8m is a bit ambitious for a portable set-up with a 6m Yagi. Maybe not so much for a quad. When I ran the model again with a minimum height of ~4m (boom at ~5m or so), the gain was still the same. When I dropped it to a lowest point of just 1.5m, it was still only down by 1dB or so. Good news, because height is always more difficult to achieve than we think when portable!
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