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ArAKern
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Posts : 7
Times Thanked : 0
Join date : 2019-11-01
QTH or Location : Southampton
Equipment Used : CRT CB PMR

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PostSubject: New Project Mobile Antenna selection   New Project Mobile Antenna selection Icon_minitimeFri Nov 01, 2019 10:24 am

Hello et All

Looking at setting up a small boat to boat PMR net for the kids to use when sailing (outside of UK waters) do not want then on the Marine VHF and dropping a £8-15 PMR HH over the side is less of an issue.

But I like to play so picked up a CRT Space U for "testing" and now looking at antennas but  not sure what to select?

Dual bands seem common.
Sirio HP 2070 H

but is a single band any better
Sirio HP 7000 C
Sirio SU 375-480PL

and just for my knowledge how does a 2 x 5/8 λ collinear compare to a 1/4 λ + 1/2λ collinear...

Any assistance or knowledge gratefully received.

Thanks
Giles
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GaryWilson
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Call Sign : 26-CT-1836 Ham 2E0GGQ
Posts : 1828
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Equipment Used : Radios & Wires & Stuff!
Age : 56

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PostSubject: Re: New Project Mobile Antenna selection   New Project Mobile Antenna selection Icon_minitimeSat Nov 02, 2019 7:06 am

Hi Giles, I would have thought in this order.

1, 2 x 5/8

2, 1/2

3, 1/4

Bare in mind on the water there is little if anything in the signal path so I would have thought a simple 1/4 wave would work just fine and be the cheapest. I can open repeaters 20/30 miles away on 70cm with enough height with my 2/70 handy. The other consideration is the Kids handy's will will only have 1/4 ish wave antennas anyway so that could be the limiting factor in itself.

73's Gary.
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MrTang
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PostSubject: Re: New Project Mobile Antenna selection   New Project Mobile Antenna selection Icon_minitimeSun Jul 19, 2020 7:47 am

I use
RH901S Antenna BNC Connector 144 430MHz
About a fiver from Ali.
Hitting Ireland np from Snowden
New Project Mobile Antenna selection -2356710
New Project Mobile Antenna selection Img_2013
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ArAKern
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Equipment Used : CRT CB PMR

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PostSubject: Re: New Project Mobile Antenna selection   New Project Mobile Antenna selection Icon_minitimeMon Nov 02, 2020 1:44 pm

Well in the end I went for a SIRIO HP 7000 C it a mono band 2 x 5/8
I picked up the USA version that in theory is tuned for 439-451 (possible a better match for PMR freq than the standard 429-440)

https://www.crtfrance.com/en/pl-system/845-hp-7000-c-high-gain-sirio.html

It has worked well so far.
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