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Old 10-10-2015, 14:18   #1
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SSB antenna problem

Icom 725, steel boat. only 13 ft of mast available for wire antenna separated from a shroud. Antenna directly into LDG IT-100 antenna tuner. Tuner cannot make a match. What next? free-standing Shakespeare antenna? Help appreciated. --Tim.
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Old 10-10-2015, 14:22   #2
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Re: SSB antenna problem

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Originally Posted by tkeithlu View Post
Icom 725, steel boat. only 13 ft of mast available for wire antenna separated from a shroud. Antenna directly into LDG IT-100 antenna tuner. Tuner cannot make a match. What next? free-standing Shakespeare antenna? Help appreciated. --Tim.
===

I use a Shakespeare 21 ft whip antenna on my trawler and it works OK.
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Old 10-10-2015, 14:46   #3
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Re: SSB antenna problem

You didn't say what type/size your boat is.

Verticals work well, particularly with steel hulls. You have a built-in ground plane.

Yes, a Shakespeare marine SSB antenna should work fine, the longer the better.

Bill
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Old 10-10-2015, 16:02   #4
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Re: SSB antenna problem

... on what frequency did you made your test? On the higher bands (20-30MHz) the tuner should be able to tune your wire.

If it fails to tune there you have another problem but 13ft is too short for the lower bands ...

Carsten
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Old 10-10-2015, 16:25   #5
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Re: SSB antenna problem

Thank you for the help. Follow up questions: A whip will pass close to my VHF antenna and radar. Any problems? Also, what is the effect of part of the antenna being beside a steel hull rather than over it? Thanks in advance.
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Old 10-10-2015, 17:02   #6
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Re: SSB antenna problem

Only one wire ??? I believe you need a Unun..But I have been wrong before....
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Old 10-10-2015, 17:13   #7
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Re: SSB antenna problem

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A whip will pass close to my VHF antenna and radar. Any problems?
Normally no problem

Quote:
Also, what is the effect of part of the antenna being beside a steel hull rather than over it?
It will have an effect on the 'antenna length the tuner sees' but the tuner should 'compensate' for this and radiation in this direction might be 'reduced'.

You should put a ground strap from the tuner GND lug to your hull (in case you forgot) ...

Carsten
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Old 10-10-2015, 17:13   #8
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Re: SSB antenna problem

Hi tkeithlu

I am not familiar with your tuner, LDG IT-100 antenna tuner.
IMHO, the tuner is a narrow band tuner for a dipole. So this will not work for
a end fed long wire.

13ft long wire? Too short to work the lower band like 40M.

Eric
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