i think there is an esthetic problem that is more important. Sent from my iPad
> On Jun 9, 2020, at 3:24 PM, Robert Sands <[email protected]> wrote: > > Verticals require more attention to ground but the goal should be to > increase the antenna current, thus increasing radiated signal. ground into > water seems like a waste but has DC grounding value. I use hung vertical > dipoles (20 and 15) with no need for ground and they work amazingly well. I > have tried letting wire or zinc ribbon strips drop into saltwater to > ground verticals and there is no value I can detect over something simpler, > like tying to existing structures or running a above water wire > counterpoise. Vertical dipoles require no Rf ground and propagate at low > angle and high efficiency. Far effects over water are what counts, more > than grounding, except in verticals to get higher antenna current. > K7VO > >> On Tue, Jun 9, 2020 at 7:38 AM Frank C Richards <[email protected]> wrote: >> >> Having been in the marine electronics business I was able to successfully >> install many HF radios on boats from large steel commercial fishing boats >> to a small 28 ft fiberglass fishing boat and sailboats. >> Anything metal , engine, fuel tanks,rudder posts,thru hulls, morse control >> cables,intercoolers outside of the hull,rub rail sections jumpered together >> to form one continuous loop. Dynaplates help but will not work well as the >> only source of ground. I once saw a carbon brush riding thru spring tension >> on a prop shaft, tying the prop to ground. >> It can be tricky as sometimes you get ground loops and you must be aware >> of currents that can cause electrolysis. >> For the antenna we primarily used a 23 ft whip, sometimes on large vessels >> a longwire. >> This was before synthesized radios and autouners. My favorite radio was >> the >> Drake TRM which had a built in manual tuner and a 50 ohm output if you >> wanted >> to use a trapped vertical. >> On commercial fishing boats you had to leave the dock so that the >> outriggers >> could be lowered and trawl doors put in the water as this changed the >> tuning >> quite a bit from being at the dock. Interestingly enough I think the >> toughest >> time I had tuning was on an 85 ft steel shrimp boat even with all that >> metal. >> . >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
