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Mast

 
 
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Pjmphil10
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Joined: 25 May 2014
Odometer: 5




PostPosted: Sun May 25, 2014 9:25 pm    Post subject: Mast Reply with quote

Hi all, um looking on increasing the distance covered on my 81. I currently use a motorola cm340 with the standard whip mounted on a magmount. Is their any way off using a tripod/ mast etc to increase distance when in a valley etc?
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excossack
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Joined: 06 Mar 2005
Odometer: 2902
Location: Somewhere



PostPosted: Mon May 26, 2014 7:44 am    Post subject: Reply with quote

I use one like this http://www.ebay.co.uk/itm/17FT-PORTABLE-ALUMINI...sh=item46152c75ae

I made a mounting plate that goes under my wheel and then I slot the mast into the upright. Secure with guy lines.

I then have a suitably cut whip that mounts into a mount with three ground planes. This is then connected via length of RG213 Coax.
If you want a picture I can set-up the gear and take a picture.

What's your call-sign ?
Mine is Gemini 33/Gemini Recovery

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Thanks - John
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Pjmphil10
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Joined: 25 May 2014
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PostPosted: Mon May 26, 2014 8:13 am    Post subject: Reply with quote

Hi, the ground plane is Bit that um not sure about, pictures would be great.
Thanks for the link, looks great and just what um after.
Msa call sign. Bovi 2
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LlaniGraham
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Joined: 06 Nov 2005
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Location: Llanidloes



PostPosted: Mon May 26, 2014 10:38 pm    Post subject: Reply with quote

I thought that there was a height limit the normal operators were limited to, and that only "Control" could use a mast?
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MSA Radio WORCESTER 1
4x4 Response Wales
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excossack
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Joined: 06 Mar 2005
Odometer: 2902
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PostPosted: Tue May 27, 2014 7:35 am    Post subject: Reply with quote

If there are height limits, its never been mentioned to me and I have been asked by a controller to bring my mast.

If you do find the regs regarding this then please share.

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Pjmphil10
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Joined: 25 May 2014
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PostPosted: Tue May 27, 2014 10:18 am    Post subject: Reply with quote

What's the dimensions on tip of the mast, wall thickness at the tip ?

I think the rule about mast heights is 9 mts. I have no idea where I read that!!
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excossack
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PostPosted: Tue May 27, 2014 2:01 pm    Post subject: Reply with quote

I can measure for tonight if I think ok. Not sure the mast is 9m though.
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excossack
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PostPosted: Tue May 27, 2014 8:46 pm    Post subject: Reply with quote

Not measured mast but here are some pics of the antenna







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Pjmphil10
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Joined: 25 May 2014
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PostPosted: Tue May 27, 2014 8:52 pm    Post subject: Reply with quote

Looks the business, ordered a mast, and getting quotes for antenna tuned into the right frequency.
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