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skyrider
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Call Sign : 26-CT-4654
Posts : 355
Times Thanked : 2
Join date : 2022-09-25
QTH or Location : Preston, Lancs.
Equipment Used : UNIDEN 100, midland alan 78 plus multi + mag mount , silver rod
Age : 63

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PostSubject: marine antenna   marine antenna Icon_minitimeThu Sep 29, 2022 8:22 pm

now here is one for the techies is it possible to use a marine antenna for a cb radio the one i have is made of fiberglass  Question
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SangueG
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SangueG


Call Sign : 26-CT-3971 / 2E0LMI
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QTH or Location : Cirencester, Gloucestershire
Equipment Used : Little radios, home-made antennas

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PostSubject: Re: marine antenna   marine antenna Icon_minitimeThu Sep 29, 2022 9:11 pm

I'd say it probably wouldn't be great. I don't know much about marine equipment, but my little V/UHF rig came pre-programmed with some marine channels... very different frequencies to CB.

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skyrider
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Call Sign : 26-CT-4654
Posts : 355
Times Thanked : 2
Join date : 2022-09-25
QTH or Location : Preston, Lancs.
Equipment Used : UNIDEN 100, midland alan 78 plus multi + mag mount , silver rod
Age : 63

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PostSubject: Re: marine antenna   marine antenna Icon_minitimeThu Sep 29, 2022 9:19 pm

ok thanks
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Victor
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PostSubject: Re: marine antenna   marine antenna Icon_minitimeFri Sep 30, 2022 6:15 am

Hi Lionel,

Yep, pretty much what Neal said.


Marine band is VHF (Very High Frequency) centred around 160MHz and CB is HF (High Frequency) down at 27MHz. 
Looking at the wavelength of those frequencies CB is 11 metres wavelength and Marine is just short of 2 metres.....

So any marine antenna is going to be way too short for CB operation.

They could look like physically similar lengths in fibreglass guises but the CB version will have helically loaded sections or simply put longer wire wrapped around it trying to squeeze a longer wavelength into a smaller space. 

I could've just said "no it won't work" but thought I'd add a bit of info so that you get the gist of it. marine antenna 1f44d 


All the best,
Victor

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43CT016
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PostSubject: Re: marine antenna   marine antenna Icon_minitimeFri Sep 30, 2022 7:41 am

Victor wrote:
Hi Lionel,

Yep, pretty much what Neal said.


Marine band is VHF (Very High Frequency) centred around 160MHz and CB is HF (High Frequency) down at 27MHz. 
Looking at the wavelength of those frequencies CB is 11 metres wavelength and Marine is just short of 2 metres.....

Unless he means Marine HF, of course, which is 27MHz! Very Happy

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Victor
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PostSubject: Re: marine antenna   marine antenna Icon_minitimeFri Sep 30, 2022 7:52 am

Ah, there's always a "but" Jeff. Wink

I'm sure there must be some 21MHz or 25MHz stuff laying about as well but most of the typical affairs that turn up on the bay or via 'friends' is for VHF.
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skyrider
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Call Sign : 26-CT-4654
Posts : 355
Times Thanked : 2
Join date : 2022-09-25
QTH or Location : Preston, Lancs.
Equipment Used : UNIDEN 100, midland alan 78 plus multi + mag mount , silver rod
Age : 63

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PostSubject: Re: marine antenna   marine antenna Icon_minitimeFri Sep 30, 2022 10:08 am

thanks for the input guys, i will now go back to my original idea of a proper cb base ant
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skyrider
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Call Sign : 26-CT-4654
Posts : 355
Times Thanked : 2
Join date : 2022-09-25
QTH or Location : Preston, Lancs.
Equipment Used : UNIDEN 100, midland alan 78 plus multi + mag mount , silver rod
Age : 63

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PostSubject: Re: marine antenna   marine antenna Icon_minitimeFri Sep 30, 2022 3:40 pm

ok which is the best antenna 5/8 or 1/2 wave thanks
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Victor
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PostSubject: Re: marine antenna   marine antenna Icon_minitimeSat Oct 01, 2022 10:28 am

Depends on who you ask Lionel, how high they're mounted, what coax you're using and from what manufacturer the antenna comes from.....

General consensus would be 5/8ths. (Argued ad infinitum here and elsewhere.)


I like to work with what I've got rather than worry about the quest for the golden chalice looking for the 'best'. Otherwise I'd be bolting up a big expensive beam. Wink
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skyrider
Major contributor
Major contributor



Call Sign : 26-CT-4654
Posts : 355
Times Thanked : 2
Join date : 2022-09-25
QTH or Location : Preston, Lancs.
Equipment Used : UNIDEN 100, midland alan 78 plus multi + mag mount , silver rod
Age : 63

marine antenna Empty
PostSubject: Re: marine antenna   marine antenna Icon_minitimeSat Oct 01, 2022 5:04 pm

right outside my bedroom there is a small tree strong enough to fix a medium sized home ant to it and if i fix the ant so it's poking out of the tree by about three feet i shouldn't get any grief off the neighbours, years ago that didnt bother me i just put the silver rods etc up anyway but now im older i do think about it a bit more, more considerate you might say
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PostSubject: Re: marine antenna   marine antenna Icon_minitime

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