Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 24-09-2012, 13:20   #1
Registered User
jram's Avatar

Join Date: Oct 2010
Posts: 40
SSB Tuner location

A friend of mine was on board a while back and pointed out that my Antenna Tuner (AT140) was positioned about 1 ft below the water line and this might not be a good thing.

Given the concept that we're trying to use the sea surface to reflect the transmitted energy, I'm tempted to move it to a location above the waterline but this will be a major task so before I set out can anyone advise how much difference its likely to make please?

Thank you!

jram is offline   Reply With Quote
Old 24-09-2012, 13:38   #2
Registered User

Join Date: Dec 2008
Boat: Journeyman
Posts: 705
Re: SSB Tuner location

The location of your tuner makes very little difference Radio-wise.
I am assuming that you have the grounding to water done properly and a long whip antenna or isolated stay.
If you move the tuner a bit (like half a meter or so) it will not change anything in terms of radio reach, but as your friend points out it could make lifetime of the tuner longer.

Another good idea is to check the tuner casing and make sure its really watertight, even tiny amounts of saltwater can cause failure, I happen to know from experience :-( (Mine was in the transom compartment, above WL but still exposed to salt dampness...)

JesperWe is offline   Reply With Quote
Old 24-09-2012, 13:46   #3
Registered User
S/V Illusion's Avatar

Join Date: Oct 2007
Location: Lakewood Ranch, FLORIDA
Boat: Alden 50 in Narragansett Bay, RI
Posts: 1,534
Re: SSB Tuner location

Recognize that the antenna actually "begins" at the tuner output so anything you have below or at the WL is compromised. Whether it actually makes any difference isn't easily divined over the internet but probably not much if any.
S/V Illusion is offline   Reply With Quote
Old 27-09-2012, 11:51   #4
Registered User

Join Date: Jan 2006
Location: Rhode Island
Boat: C&C 38
Posts: 519
Images: 6
Re: SSB Tuner location

I don't think it makes nearly as much of a difference as carefully and patiently laying out your counterpoise. If you're going to invest time due to suspicious coverage or weak signals etc, I would spend time in grounding.

SSB/HF Radio Applications in Modern Sailing Vessels | Pacific Cup
phorvati is offline   Reply With Quote
Old 27-09-2012, 12:51   #5
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2006
Location: Chesapeake Region and Maine
Boat: 42' Bob Perry sloop
Posts: 3,928
Images: 4
Re: SSB Tuner location

As others have said, positioning the AT140 1' below the waterline will make no discernable difference to your signal output.

However, the cautions regarding saltwater-free locations are well taken.

btrayfors is offline   Reply With Quote
Old 27-09-2012, 13:44   #6
Registered User
jram's Avatar

Join Date: Oct 2010
Posts: 40
Re: SSB Tuner location

Thank you all for your contributions - well received! The location is saltwater-free and the connections are all in good shape.

I take on board the views on paying attention to the grounding - I have about 15 ft of 4 inch foil between the radio and the tuner and a further 5 ft between the tuner and a Small Dynaplate. I am tempted to run a further length of foil to the main water tank to further increase the surface area or I could make up a bunch of radials as discussed elsewhere.

The reason I am doing this is that I want to improve my reception of weaker signals. It seems that my Tx signal is pretty good (although not as good as some others).

jram is offline   Reply With Quote


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:49.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.