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Old 05 December 2005, 15:54   #1
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VHF Range

Hi There,



I have a question about VHF Range,



I did my VHF/DSC a while ago and i am sure that I was told that VHF works on line of sight, and that even though your not allowed to use VHF on land it would not work anyway - as Manchester is so far away from the sea.



I was talking to a guy at work that is into his radio’s (although not vhf) he told me that it should work at home, even though you’re not supposed to do this.



I would just like some clarification on this, as it would push me quicker to the shop if it did, even though I would not as your not supposed to.
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Old 05 December 2005, 16:29   #2
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Hi Steve,

Not too sure of your question but the way I read it is you want to know if your Radio will work at home.

Yes it will. But it will only be able to speak to other radios operating on the same set of frequencys and for only a certain distance.

Manchester to the sea. Haven't you got the Manchester ship canal near you. Maybe they operate on Marine frequencys. If you want to listen to Marine radio I should imagine you won't be able to over that distance.

Besides the fact that you aren't allowed to use your Marine Radio on land other than for talking to crew men whilst berthing etc, VHF handsets will only transmit a couple of miles under ideal conditions and Fixed VHF sets probably 20 miles tops with a good high aerial.

Having said that if you fit a base station in your house with a 100 foot aerial who knows !!

Steve, Personally I would only use my radio at home for testing purposes. The way Radio frequencys are allocated its quite possible that the Marine ones conflict with some land based systems.

I use Radios to some extent at work and after some discussion we all agree that the 25 watts that a VHF Marine Radio can pump out is quite a lot.

Maybe somebody could enlighten us more. I see a spot for David Brooks here.


If you just want to listen to Marine Radio traffic, why don't you look at some sort of a scanner. Not that I know much about them but they can be very expensive.

Hope this helps a little.

Regards Nick R.
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Old 05 December 2005, 16:50   #3
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David Brooks?

Is he new here?

You are never more than 72 miles from the sea here!
You can use that one if it goes quiet in the snug!

Line of sight is taken from the top of your antenna to the top of the other station.
So if you were a coastguard station with an antenna some 200 feet up your range would be preety good.

If your using your hand held then range is limited.

As suggested a scaner with a decnet outside anteena would give the best results from home, you are also then not just limited to the marine chit chat.

They take a dim view of marine radio used in land if it is not for a legit reason.

Hope that helps a bit and hopefully David Brooks can give you some pointers too

Regards
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Old 05 December 2005, 16:52   #4
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Jon,

Sorry No offence, Your so famous you know I meant you....
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Old 05 December 2005, 17:20   #5
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Tis ok none taken!
Not sure famous is the right way to look at it

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Old 05 December 2005, 19:10   #6
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Quote:
Originally Posted by Jon Brooks
Tis ok none taken!
Not sure famous is the right way to look at it

Regards
Definitely notorious...
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Old 06 December 2005, 03:51   #7
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Quote:
Originally Posted by Jimbo
Definitely notorious...

Why thank you James.....I think!

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Old 06 December 2005, 04:09   #8
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When im working on the boat at home I have me radio on. Get very good reception from VTS Humber and all the BWB locks along the trent valley.

Me dad used to have a Belcom scanner at home and that was great (especially when the nice man at Lowe electronics put 0 in it shhhhh..) Made you feel you were still boating in the middle of winter!!! That said the muppet sold it with his boat never mind. I think alot depends on atmospheric conditions and your locallity. I sometimes take me handheld with me in the truck if I know im going to be parked up near the seaside.
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Old 06 December 2005, 10:05   #9
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Range formula

There's some sort of formula to work out your range based on antenna height, did it in my RYA VHF - then forgot it. Will have a look tonight if no one digs it up sooner.
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Old 06 December 2005, 12:56   #10
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Formula for range

Range = 2.25 x square root of antenna height in metres

This is in ideal conditions though.
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