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Author Topic: Coax rating  (Read 6880 times)

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Allocator

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Re: Coax rating
« Reply #15 on: April 13, 2009, 06:54:23 AM »
If I had a polar diagram like that, I wouldn't care if I was using a bit of wet string :-)
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CoastGuardJon

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  • Mullion Cove, Kernow --- sw Cornwall UK.
Re: Coax rating
« Reply #16 on: April 13, 2009, 11:57:53 AM »
Hi kdt1, use the best and least "lossy" co-ax from externa antenna, with N-type connectors, but use a very flexible (eg RG-174) co-ax patch lead for the final couple of feet or so.   You need an SMA plug on the RB end, and you can't fit one of them to a heavier co-ax which is larger outside diameter (10 - 15mm, depending on which one you get) and nothing like as flexible.
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ANRB :  AOR AR8000 : Icom R-7000 : Icom IC-R9000 : JRC NRD-545 : OptoElectronics Digital Scout and OptoLinx Interface; Realistic Pro-2005 : UBC 800XLT - listed in alphabetical order, not cost, preference, performance or entertainment value!

EGNXR

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Re: Coax rating
« Reply #17 on: April 13, 2009, 02:00:57 PM »
Quote from: kdt1 on April 13, 2009, 01:56:43 AM

Quote from: EGNXR on April 12, 2009, 08:39:28 PM

Low loss or not its all about how high and open you can get your aerial.

HTH
Cheers John


So you use the RG174 coax and aren’t concerned because you have height?


I am not concerned with the RG174 it does what it is supposed to do.

If I put the aerial on my windowledge my coverage drops to about 20Nm with about 16 - 30 returns at peak times on the box both mode-s and ADSB.
By experimenting I have increased that to over 150Nm and 150+ at peak times.

I've taken my lapop up to my local airport and achieved a similar polar diagram
with returns of over 200. So the the radar box and supplied aerial do exactly what they should do and very well. The down side to this is the supplied aerial is not specifically for external use. Any loss in the supplied aerial is not really a factor because the range that can be achieved is far greater than I can physically see.

Where are you located, whats your nearest comercial airport and are you supplying the network because I am curious to see what kind of traffic your getting.

Cheers John
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Based in Derby 5Nm NW of EGNX

kdt1

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Re: Coax rating
« Reply #18 on: April 13, 2009, 03:25:15 PM »


Loss for you and many others just isn’t a factor with you height as your polar diagram reveals KMSP is about 15 miles away, not a unreasonable distance
at all. Height is definitely the most important element here but with my limitations on height and obstructions I believe I need to also look at loss in my situation. Don’t you think?

The ADS-B traffic here is few and far in between and I do turn on my share  from time to time when I have contacts but they don’t last long.

So if you blink your out of luck. Ha

Cheers
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