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AirNav Systems Forum
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AirNav Radar Discussion
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Runway 31
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Reflection quality
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Topic: Reflection quality (Read 5151 times)
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catman
New Member
Posts: 16
Reflection quality
«
on:
June 28, 2009, 06:08:38 PM »
Hi everyone, another query here
as it stands my antenna on the roof has three spokes, I was wondering if I changed this from the three spokes to a dish would I get a better signal/higher field of interception with receiving planes? I would have thought as much betcause it would be a better reflection to the aerial but just want to run it past you guys?
Thanks
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EMA
Guest
Re: Reflection quality
«
Reply #1 on:
June 28, 2009, 06:53:35 PM »
If it is a professionally designed antenna it will make no difference to its performance.
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catman
New Member
Posts: 16
Re: Reflection quality
«
Reply #2 on:
June 28, 2009, 08:17:07 PM »
Thanks for the quick reply, my query wasn't so much as to the performance aspect to which I think you were relating but more so the range and quality of the signal being picked up? Or is that what you meant.
Thanks anyway
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EMA
Guest
Re: Reflection quality
«
Reply #3 on:
June 28, 2009, 08:34:14 PM »
That is what I meant, a disc will make no difference to the signal range and quality.
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daveg4otu
Full Member
Posts: 164
Re: Reflection quality
«
Reply #4 on:
June 29, 2009, 06:58:15 AM »
IIRC - the maximum gain of a Ground plane antenna is in the direction that bisects the angle between the vertical element and the ground plane.... so if the GP is "spokes" are at , say, 45 degrees below horizontal....max gain will be at about
22.5 degrees above the horizontal -
If you substitute a horizontal metal dish - the max gain lobe will elevate to 45 degrees above the horizon.
All the above relate to "perfect conditions"- in practice many other factors can have an effect.
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5 Miles N of BHD at 50.28.28 N/3.30.43W...400ft amsl.
Hampshire, Devon, Dorset and Isle of Wight Airfields Websites.....
http://devonairfields.tripod.com/index.htm
malc41
RadarBox Beta Testers
Hero Member
Posts: 586
Re: Reflection quality
«
Reply #5 on:
June 29, 2009, 11:30:50 AM »
catman which aerial are you using?
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15 Miles East of EGNJ
catman
New Member
Posts: 16
Re: Reflection quality
«
Reply #6 on:
June 29, 2009, 03:04:35 PM »
Hi, The antenna came from water&stanton RADAR-EXTENDER External antenna for RadarBox External antenna for RadarBox, 1m long, N type, 6dB gain, 48mm base clamp max.
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malc41
RadarBox Beta Testers
Hero Member
Posts: 586
Re: Reflection quality
«
Reply #7 on:
June 29, 2009, 03:22:32 PM »
catman
Yeah the same as I have, just wondered whether you had tried the change or it was just a general enquiry?
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15 Miles East of EGNJ
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Reflection quality