[Elecraft] K3 working on motorboats - possible

[Barry]

Yes. This will work, but Peter is in fresh water which is not a good 
ground. That means the only ground he will have is the copper plate. The 
sintered metal plate, a Dynaplate, works nicely as the Coast Guard 
requirement of 100 square feet, but only in saltwater. I know as I've 
tried a few schemes in both brackish and saltwater.

73,
Barry
K3NDM


------ Original Message ------
From: "John Langdon" <WOYB10051 at outlook.com>
To: "jim at audiosystemsgroup.com" <jim at audiosystemsgroup.com>; 
"elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
Sent: 6/8/2020 9:09:51 PM
Subject: Re: [Elecraft] K3 working on motorboats - possible

>The shrimp boats often used a 108" stainless steel CB whip on a spring, and a large copper plate on the outside of the hull under water. They got out very well on 11M. With modern rigs and built in tuners, you could probably do well on 10, 12, 15 and 17 M too.
>
>73 John N5CQ
>
>
>-----Original Message-----
>From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Jim Brown
>Sent: Monday, June 8, 2020 7:18 PM
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] K3 working on motorboats - possible
>
>On 6/8/2020 1:47 PM, Peter Kaletsch wrote:
>>  But how do I get a reasonably effective earth?
>You don't need an "earth," you need a counterpoise.
>
>VE0JS, who has sailed around the world four times on a 37-ft sail boat, loads the backstay against a sintered bronze plate in the water. I suggest that you do something similar for the vertical, and one or more wires strong along the boat as a counterpoise. She has a remote tuner at the base; the feedline in your boat will probably be short enough that you can use a tuner built into the radio.
>
>A bunch of us in North America have worked her from the south Indian Ocean on 40M. She's running an ICOM marine radio, SSB only, with no voice processing. Check out her qrz page.
>
>73, Jim K9YC
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