Wire antennas - Ships Nostalgia
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Wire antennas

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  #1  
Old 15th May 2020, 06:20
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lagerstedt lagerstedt is offline  
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Wire antennas

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
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  #2  
Old 15th May 2020, 10:35
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Varley Varley is offline   SN Supporter
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Stonehaven/GYXD.

Radio Room Port fwd. Main to Port Samson post. Reserve to Stbd.
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  #3  
Old 15th May 2020, 11:10
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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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  #4  
Old 15th May 2020, 20:31
Tim Strickland Tim Strickland is offline  
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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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  #5  
Old 15th May 2020, 22:01
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Quote:
Originally Posted by Tim Strickland View Post
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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  #6  
Old 15th May 2020, 23:24
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I have used the v beam at another QTH with great results. May go back to it.

73 Blair Lagerstedt
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  #7  
Old 16th May 2020, 05:55
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I remember a lot of 12-gauge insulated wire hanging out portholes.
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  #8  
Old 16th May 2020, 06:41
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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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Old 16th May 2020, 21:48
dannic dannic is offline  
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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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  #10  
Old 17th May 2020, 15:20
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Quote:
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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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  #11  
Old 17th May 2020, 23:52
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Originally Posted by R651400 View Post
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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  #12  
Old 18th May 2020, 06:52
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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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  #13  
Old 18th May 2020, 07:01
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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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  #14  
Old 18th May 2020, 08:03
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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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  #15  
Old 18th May 2020, 08:28
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GBTT/1 aerial info here
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  #16  
Old 19th May 2020, 22:15
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GBTT/1 aerial info here
Absolutely fascinating - thanks for that.
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  #17  
Old 21st May 2020, 10:28
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Thanks for the response. Lots to think about.

Blair Lagerstedt
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  #18  
Old 22nd May 2020, 21:00
sparks69 sparks69 is offline  
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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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  #19  
Old 23rd May 2020, 02:34
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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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  #20  
Old 29th May 2020, 05:15
BobMac123 BobMac123 is offline
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Quote:
Originally Posted by sparks69 View Post
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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