Fan Dipole Queries

[2E0IHR]

Hi,

I'm planning to construct a fan dipole for the following bands 40/20/17/15/10m, I realise that the 40m element will also probably work on 15 as 3/4 wave, but will lobes and nulls develop on 15m in this case? If I have a separate 15m element, will the self selection on the basis of impedance favour the 15m element when using the band rather than the 40m element? I wasn't going to have a separate 12m element, will the 10m element likely tune on 12m with the internal tuner of my ft991a or will it be outside of its range? If anyone can advise as to the above, I would be very grateful. How far apart should the elements be spaced? Is there anything else, possible problems etc that I should be aware of with this type of antenna?

Many thanks for any help that anyone can give.

73

Owen 2E0IHR

[Auldgeek]

Don't add a separate element for 15m if you are using a 40m element. Trim your 40m element accordingly for 15m.
As for your 10m element being resonant on 12m, it's highly unlikely. Dipoles are inherently narrowband, so your SWR is likely to be too high. I'd fit a separate 12m element. Fitting a balun will increase the bandwidth and flatten the SWR a bit