Peter,
In general, any vertical works lots better with more radials. As
fresh water is a fairly poor conductor, the more the merrier!
Unfortunately, because most boats are wooden/fiberglass, what you can
add helps. I don't know if they have to be 1/4 wavelength (I've read yes
and some say at least 0.20 wavelength). For HF, this would be some
serious lengths for most boats! I expect you'd have to load them similar
to the vertical element, but I haven't read anything regarding loading
radials: It's just a guess. I suppose one could attempt to replicate, to
some extent, a solid ground plane with foil or some other conductor
(maybe chicken wire?). It would seem a lot of work (and probably is!).
If you're insistent on a vertical, it's a narrow field of variability.
Some of the portable antenna's can make loaded dipoles or verticals,
which would operate fairly well without a ground plane. Another option
might be a magnetic loop (which doesn't care much about "ground" per se.
It is affected by near-by conductors, tunes very narrowly, and is big
(compared to a mobile vertical). So, whatever you choose, it's all some
sort of compromise.
kurtt WB9FMC
On 6/8/2020 3:47 PM, Peter Kaletsch wrote:
Hello fellows;
You are my last hope as I cannot imagine that I am the only one in the world
who wants to try that.
For many months I have been trying in vain to get tips on how to operate a K3
well on a small 13 meter motor yacht. I am talking about fresh water usage
(Lake Garda in Italy), not salt water, and of a GFK built boat.
A dipole is eliminated, it is not a sailing boat. I thought of using a Tarheel
Antenna, but the manufacturer advised me against it.
So normal, shortened mobile antennas, mounted on the device carrier, where also
the antenna for marine radio is located, should point the way ...?
But how do I get a reasonably effective earth? I read a lot of negative things
about ground plates - fast growth, the hull has to be pierced.
I have already considered laying radials from the antenna base below deck in
the invisible area, but will this work...?
I am very grateful for every tip and every help - also to
[email protected]
Thanks in advance
Peter - DL1MDZ
________________________________
Peter Kaletsch GmbH | Fürstenrieder Straße 275 | 81377 München | Tel: +49 (0)
89 / 89 60 93 - 0 | Fax: +49 (0) 89 / 89 60 93 - 99 | [email protected] |
Handelsregisternummer HRB 108093 | Amtsgericht Muenchen | Steuer-Nr:
143/170/40017 | Geschäftsführer: Peter Kaletsch | Sitz der Gesellschaft:
München |
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