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From: k2ors@comcast.net
To: Steve.Floyd@baesystems.com (Steve Floyd),rsgb_lf_group@blacksheep.org, rsgb_lf_group@blacksheep.org
Cc: "Andy Talbot" <andy.g4jnt@googlemail.com>, "Linda Holtby" <linda.holtby@googlemail.com>
Date: Sat, 09 Jun 2007 18:46:59 +0000
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Subject: Re: LF: MF Still on shifp?
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Hi Andy,

      I think that is very possibly a 500kHz antenna. Steve Floyd W4YHD was on a cruise ship recently and they still had 500kHz equipment and were still monitoring! I have cc'd Steve  on this e-mail in case he has some more information to add.

BTW - Are the big wire cage antennas still atop the Ministry of Defence on Whitehall Street - last time I was in London (2003) they were still there.


--
73 Warren K2ORS/WD2XGJ/WD2XSH/23/WE2XEB/2
FN42hi
http://www.w4dex.com/wd2xgj.htm

 -------------- Original message ----------------------
From: "Andy Talbot" <andy.g4jnt@googlemail.com>
> Yesterday I was watching two large cruise ships sail down Southampton water
> (P&O ships,  'Artemis' and 'Aurora').   Both had a large wire antennas
> strung between the masts, and in the case of  Artemis this extended down at
> each end close to bow and stern; and there may even have been two wire
> side-by-side on this ship.  A really long antenna.   I'm not sure of the
> length of these ships, but they could  be 200 metres (ish), so even at the
> bottom end of HF these are electrically long-wires.
> Of course, the pair on Artemis, if I saw them correctly, could even be
> phased for really high gain at HF - a Rhombic perhaps?
> 
> Does anyone know if large modern ships still have MF, or a serious HF
> presence?  Or are the wire antenna(s ?) just there to hang flags from?  Or
> are they not even antennas, but just used for supporting decorations.
> 
> Artemis also had a mass of big whips on the bow, which I assume were base
> tuned HF - the normal VHF whips were practically invisible beside them.
> Aurora presumably had something similar, but they weren't obvious.
> 
> Needless to say, each ship had two large VSAT radomes, and three or four
> smaller Inmarsat (and other satcom?) antennas.
> 
> Andy  G4JNT


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From:    "Andy Talbot" <andy.g4jnt@googlemail.com>
To:    rsgb_lf_group@blacksheep.org
Cc:    "Linda Holtby" <linda.holtby@googlemail.com>
Subject:    LF: MF Still on shifp?
Date:    Sat, 9 Jun 2007 17:34:23 +0000
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<div>Yesterday I&nbsp;was watching&nbsp;two large cruise ships sail down Southampton water (P&amp;O ships,&nbsp; &#39;Artemis&#39; and &#39;Aurora&#39;).&nbsp;&nbsp; Both had a&nbsp;large&nbsp;wire antennas strung between the masts,&nbsp;and in the case of&nbsp; Artemis this extended down at each end close to bow and stern; and there&nbsp;may even have been two wire side-by-side on this ship.&nbsp;&nbsp;A really long antenna.&nbsp;&nbsp; I&#39;m not sure of the length of these ships, but they&nbsp;could &nbsp;be 200 metres (ish),&nbsp;so even at&nbsp;the bottom end of HF these are electrically&nbsp;long-wires.&nbsp;&nbsp;&nbsp; 
</div>
<div>Of course, the pair on Artemis, if I saw them correctly, could even be phased for really high gain at HF - a Rhombic perhaps?</div>
<div>&nbsp;</div>
<div>Does&nbsp;anyone know if&nbsp;large modern ships still have MF, or a serious HF presence?&nbsp;&nbsp;Or are the wire antenna(s ?) just there to hang flags from?&nbsp; Or are they not even antennas, but just used for supporting decorations.</div>

<div>&nbsp;</div>
<div>Artemis also had a mass of big whips on the bow, which I assume were base tuned HF - the normal VHF&nbsp;whips were practically invisible beside them.&nbsp;&nbsp; Aurora presumably had something similar, but they weren&#39;t obvious.
</div>
<div>&nbsp;</div>
<div>Needless to say, each ship had two large VSAT radomes, and three or four smaller Inmarsat (and other satcom?) antennas.</div>
<div>&nbsp;</div>
<div>Andy&nbsp; G4JNT</div>

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