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 Homebase Antenna approx 3 metres long?

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Seasick
kelsm
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PostSubject: Homebase Antenna approx 3 metres long?   antenna - Homebase Antenna approx 3 metres long? Icon_minitimeSun Mar 21, 2021 2:44 pm

Following an earlier post about using my mobile antenna for homebase use,
Does anyone know of a reasonably decent homebase antenna that is about 3 metres ish long, I can get away with that height but will struggle with anything above 4 metres
Any help is most welcome TIA
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Seasick
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PostSubject: Re: Homebase Antenna approx 3 metres long?   antenna - Homebase Antenna approx 3 metres long? Icon_minitimeSun Mar 21, 2021 3:20 pm

A tank whip, is around that length. It is 1/4 wave. Or around 9 feet. There is also a 7 foot firestick, I was looking at them on Knights Elctrocom site. 

https://www.kcb.co.uk/contents/en-uk/d32.html
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PostSubject: Re: Homebase Antenna approx 3 metres long?   antenna - Homebase Antenna approx 3 metres long? Icon_minitimeMon Mar 22, 2021 8:04 pm

Second the above, 1/4 wave ground plane antenna is the way to go and there won't be much difference between that and a 1/2 or 5/8 wave in real world performance.
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PostSubject: Re: Homebase Antenna approx 3 metres long?   antenna - Homebase Antenna approx 3 metres long? Icon_minitimeMon Mar 22, 2021 8:08 pm

Northern Crusader wrote:
Second the above, 1/4 wave ground plane antenna is the way to go and there won't be much difference between that and a 1/2 or 5/8 wave in real world performance.


I can go with the 1/4 wave whip but how would I mount it ?
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PostSubject: Re: Homebase Antenna approx 3 metres long?   antenna - Homebase Antenna approx 3 metres long? Icon_minitimeMon Mar 22, 2021 8:38 pm

If you take a look around the site that Seasick posted a link to, Knights have a 'build your own' section under the Base Antennas (HAM) tab that has some useful parts to mount whips and wires. You might find something that wold suit you on there, or at least maybe give you ideas how you could make a mount yourself.

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PostSubject: Re: Homebase Antenna approx 3 metres long?   antenna - Homebase Antenna approx 3 metres long? Icon_minitimeTue Mar 23, 2021 7:21 am

I use this, 

https://www.moonraker.eu/antennas/cb-radio-antennas/sirio-gpa-27-45-1-4w-ground-plane-antenna

ready to go with the three ground planes. cheers
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PostSubject: Re: Homebase Antenna approx 3 metres long?   antenna - Homebase Antenna approx 3 metres long? Icon_minitimeTue Mar 23, 2021 10:13 am

morris wrote:
I use this, 

https://www.moonraker.eu/antennas/cb-radio-antennas/sirio-gpa-27-45-1-4w-ground-plane-antenna

ready to go with the three ground planes. cheers

That must be a quarter wave centre fed, as it is 6 feet tall. And Kelsom can only get away with a quarter wave, so why reduce that radiating element to a quarter wave to a eighth of a wave? Electrically small antenna, are much  less efficient than larger antenna, although that stops being such an issue at quarter wave. Where radiation angles start to equal things out. Also a single quarter wave radiator on a roof, is much less visually intrusive than that tripod. 

Kelsom. Use the full height that you can get away with & use a base fed vertical, a mobile whip. Mount it on a decent mag mount, as a 8 to 9 foot whip will take a battering from the wind.  And what I would do is get a pack of decent sized ring crimps & some bell or speaker wire. Strip the wire to single core connect the crimps around the edge of the magnet, & then lay at least 4  radials out from the magmount on the roof.  Looking online, a quarter wave at 27.5 mhz should be 8 feet 6 inches long. 

If the roof is metal it will give a good earth, but the fact you are using a magmount will make the connection less than perfect. So the cut radials will hopefully help reduce the radiation angle, back to the low angle that a ground plane quarter wave should have.  And it is the radiation angle of a quarter wave, that will give you an antenna, that performs almost on a par with a half or 5/8th wave.

Just to add. For the cost of some cheap bell or speaker wire & some cheap crimps. It is certainly worth trying to optimise your antenna. The radials may achieve nothing. But the fact they can be cut to 27.5 mhz, means they could give you an optimised antenna on 27.555 & near by. So for pennies is worth the cost & effort.
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PostSubject: Re: Homebase Antenna approx 3 metres long?   antenna - Homebase Antenna approx 3 metres long? Icon_minitimeTue Mar 23, 2021 2:29 pm

Seasick wrote:
morris wrote:
I use this, 

https://www.moonraker.eu/antennas/cb-radio-antennas/sirio-gpa-27-45-1-4w-ground-plane-antenna

ready to go with the three ground planes. cheers

That must be a quarter wave centre fed, as it is 6 feet tall.

According to the documentation, the elements on this antenna can be adjusted from a little over 5 feet to between 8 and 9 feet long.  This puts its maximum length at or near 1/4 wavelength on the CB band.


The DB
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PostSubject: Re: Homebase Antenna approx 3 metres long?   antenna - Homebase Antenna approx 3 metres long? Icon_minitimeTue Mar 23, 2021 4:41 pm

The DB wrote:
Seasick wrote:
morris wrote:
I use this, 

https://www.moonraker.eu/antennas/cb-radio-antennas/sirio-gpa-27-45-1-4w-ground-plane-antenna

That must be a quarter wave centre fed, as it is 6 feet tall.

According to the documentation, the elements on this antenna can be adjusted from a little over 5 feet to between 8 and 9 feet long.  This puts its maximum length at or near 1/4 wavelength on the CB band.


The DB


Yes, sorry, I have just had a another look and it's 15 feet tall. I must have looked at one of the other pages, as several different variations of this  antennas are covered. And at 15 feet tall, it is way above what kelsm can get away with.

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