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Discussion Starter #1
Hi Looking for some info on the type wire antennas used on vessels with accommodation aft. The USSC in NZ and many companies with accommodation aft use a wire antenna that turned back on itself.
I use a 20.336m end feed into an AT 3000 automatic ATU the into a Kenwood TS140s. Its about 3m above house roof then down to the back of the section. About 5m high at the end. Gets me into Japan and the EU and across to Rarotonga. Tried to get into Uruguay one night off the back end. We were both about 4/4. Gave up, he then made contact with RA0 no problems. Now playing with Mr Windoms original windom. Rx ok yet to try TX. I'm a wire antenna fan, however, I have a 1200m2 section and wife so i'm limited in what i do. Always experimenting. Any comments appreciated. I operate IRLP into Ireland, SA and into England form time to time.

Blair Lagerstedt
ZL2BFO.
 

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When ship architecture moved from twin masted to an almost aft end zero and retain the priority of outputting a reasonable signal on 500 khz with wire?
It must've been one helluva headache for the designers or as I read in just turn up the wick ie more tx power..
 

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Wire aerials

I use an end fed wire in a horizontal V. Overall length about 40 mts with the V at the half way point. The aerial is fed via an ICOM AH4 auto ATU. It works well and tunes on all HF bands.

Ref long wire aerials on all aft accommodation ships, we usually had some form of inverted L. Crusader/o'span'commandant etc all tuned easily.
 

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I use an end fed wire in a horizontal V. Overall length about 40 mts with the V at the half way point. The aerial is fed via an ICOM AH4 auto ATU. It works well and tunes on all HF bands.

Ref long wire aerials on all aft accommodation ships, we usually had some form of inverted L. Crusader/o'span'commandant etc all tuned easily.
Long length of twin core out the cabin, along alleyway and out door to deck - then up to aft of wheelhouse and wrapped around handrails so stood some chance of getting world service!

Don't think I ever sailed with a sparky who bothered with tv/radio antenna. Not that any spares would have been supplied anyhow!
Dannic.
 

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Discussion Starter #6
I have used the v beam at another QTH with great results. May go back to it.

73 Blair Lagerstedt
ZL2BFO
 

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Shipboard antennas were primarily designed for MF (500 kHz) - the aim being to get as much wire in the air as possible....
 

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One of the best I saw was aframax tanker, crew tv was a co-ax out the rec room and along alleyway, out thro deck door to a sodium light bulb on a stand. Was left there on purpose for managers visit during cargo discharge to point out some of the deficiencies, and worked. Got spares!
Dannic
 

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Shipboard antennas were primarily designed for MF (500 kHz) - the aim being to get as much wire in the air as possible....
And preferably the ubiquitous ' T ' formation for max self-capacitance/artificial length making MF /500 kcs resonance possible.
HF had to fall in with this but can't understand when the marine bands were harmonically related why there was never a separate HF aerial that took advantage of this. Doesn't sound as if it would break the bank.
 

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And preferably the ubiquitous ' T ' formation for max self-capacitance/artificial length making MF /500 kcs resonance possible.
HF had to fall in with this but can't understand when the marine bands were harmonically related why there was never a separate HF aerial that took advantage of this. Doesn't sound as if it would break the bank.
Indeed - a nice 20m vertical, for instance...

Aahh...shipping companies...
 

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Believe ss United States/KJEH radar and signal mast was pure aluminium and doubled as the ship's main aerial..
Be interesting to get some proof of this.
 

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ps Only British company I recall dabbling with verticals was Brocklebanks who mounted them on the funnel.
 

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Probably the most innovative install (for her time) I have ever seen was Queen Mary 1.

She had separate LF, MF and HF tx antennas......and 7 separate rx antennas, including dipoles and crossed dipoles...
 

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BP Tankers had a variety of aerial types mostly wires but we had Funnel Whips, Dekmann Klappers (?) vertical tower types but the best ones I came across were on the old 16's 110 ft high masts with a centre fed T arrangement with a 'Span in the radio Room. They all seemed to work OK.
 

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The difference in signal strength on 5 ton between the typical short wire antenna found on modern ships and a ship with a decent long wire was very noticeable...
 

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BP Tankers had a variety of aerial types mostly wires but we had Funnel Whips, Dekmann Klappers (?) vertical tower types but the best ones I came across were on the old 16's 110 ft high masts with a centre fed T arrangement with a 'Span in the radio Room. They all seemed to work OK.
Hi - the BIDFORD PRIORY the typical L shaped aerial & was OK - mind you she mainly did the Persian / Med run like a pipe line picking up the line off lebinen ..you could get GLD in most evenings !!..
She had the new TRUE MOTION RADAR without the outer casing while testing & wheelhouse doors closed preventing weather ./ sand storms attacking it !! - the mates hated it !!!
 
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