FlightAware Discussions

8dBi 978MHz-1090MHz Antenna

Sweden too, and may be Korea (See my post156790.html?hilit=UAT#p156790 post).

Hm, ok, I thought Sweden was trying to do it on VDL. Maybe that didn’t go anywhere.

Of course an 978mhz with a high gain will be perfect fit, up the line with RG-6 cabling.

Also, keep in mind folk, the 978 , UAT, will give you the weather info ! That’s mostly the best or only real benefits of the adsb adoption let say. Flarm could had been used, but getting traffic is ok, in the air. Over 978 it’s little lower reception, so an already
tuned antenna for both is a very great idea for product. Hope it’s gonna be on Amazon.CA as well.

I agree. I have Dump1090 working great and I have everything I need for a good PiAware978/Dump978 on a different system.

A good 978 antenna is worthless without a system to use it. Any word on one?

Thanks,
Steve

I run dump978 with a 2nd dongle (using stock antenna) on the same Pi2 as dump1090. I feed the results back into dump1090, which sends to FA / FR24. The reason I can get away with the stock antenna is that I have direct line of sight to a local ADS-B tower/groundstation.

Since you use stock antenna, see this post: How to improve performance of whip antenna of DVB-T
for 978 MHz (wavelength = 307 mm, 1/4 wavelength =77 mm), cut the whip 77 mm - 3 mm = 74 mm. The 67 mm shown in drawing is for 1090 MHz (wavelength 275 mm)

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Yeah, I’ve been meaning to do that. Is the size of the ground-plane important? (i.e. does it need to be at least 67mm radius, or just the bigger the better?)

(1) For 978 MHz (wavelength = 307 mm, 1/4 wavelength =77 mm), cut the whip 77 mm - 3 mm = 74 mm. The 67 mm shown in drawing is for 1090 MHz (wavelength 275 mm).

(2) Optimum height of Can is also 1/4 wavelength (74 mm fo 978 mm & 67 mm for 1090 MHz). However, the height of can is not so critical, and more or less height wont make much difference. You can try different cans to see which one gives best results.

(1) For 978 MHz (wavelength = 307 mm, 1/4 wavelength =77 mm), cut the whip 77 mm - 3 mm = 74 mm. The 67 mm shown in drawing is for 1090 MHz (wavelength 275 mm).

(2) Optimum height of Can is also 1/4 wavelength (74 mm fo 978 mm & 67 mm for 1090 MHz). However, the height of can is not so critical, and more or less height wont make much difference. You can try different cans to see which one gives best results.

Height of can, or the radius/diameter of the top?

(1) Diameter of Can:
I have tried cans of various diameters upto 100 mm.
Cans less than 2⅝ inch (67mm) diameter gave poor results.
Cans with diameter 2⅝ inch (67mm) and up to 3⅞ inch (100 mm) gave nearly same result.
I did not try bigger than 3⅞ inch (100 mm) diameter can. You may try bigger dia cans to find out if “bigger is better” holds true.

(2) Height of Can:
Optimum height is ¼ wavelength, but this has lot of tolerance and somewhat higher or shorter cans don’t make much difference. You can try cans of various heights to find which one gives you best result.

(3) Height of Whip:
This is most effective in improving performance. The optimum length of whip is ¼ wavelength (69 mm for 1090 Mhz & 77 mm for 978 MHz). Due to “end effect”, the whip is made few mm shorter than ¼ wavelength, i.e. for 1090 MHz 69mm - 2mm = 67mm, and for 978 Mhz 77mm - 3mm = 74mm.

  • Wavelength λ in mm = 300,000 / frequency in MHz*
    .

Back to the 8db antenna … if buying an antenna, higher gain is always preferable since this is likely to be a one-time purchase … you can still add an amplifier later.

I fully agree with Peter.
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So, is this new antenna definitely a go, or is it still being considered? What would the timeline be?

Thanks.

[quote=“david.baker”]We are thinking of adding in a batch of 8dBi UAT + ADSB antennas in our next shipment.
[/quote]

Any update on this? I am waiting on buying the DPD Productions UAT antenna, if this new FA antenna is coming to market.

I want one, too!

Happy Halloween!

LOL :smiley:

Meeeee toooooo!!!

[quote=“sjacket99”]

As do I… I got money burning a hole in my pocket waiting!!! :slight_smile:

FlightAware will be doing a small run of the 8dBi dual frequency 978 and 1090 antenna. Available most likely after Thanksgiving and available on Amazon.

Test antenna are showing amazing range. Test antenna with amplifier beats anything we have tested at FlightAware.

Awesome

will it have a larger mount clamp and available in europe?