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  • petercr
    replied
    Here's the antenna with an addition I made this afternoon - the bottom section is a piece of 50mm PVC-U pipe with caps and IP68-rated cable glands that should be totally water-proof. When the satellite amp arrives I intend to fit it in there along with the power supply.
    IMG_20180318_160425_1.jpg

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  • petercr
    replied
    De-lurking after reading all 271 pages... Today saw me install an 8-element open top CoCo using RG6 inside a 3m length of 15mm (1/2" for you non-metric types) PVC conduit attached to a j-bracket and with the limited horizon I've got (due to the house and other tall gum trees and palm trees in the area) I've managed to get a max range of just over 130NM after about 12hrs of reporting. Have ordered a Prostick+ and separately from eBay one of those generic 20dB satellite amps (along with a TV amp power supply (with built-in DC blocker) that was lying around) - see which one turns up first... Hopefully I can get my range up even further.

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  • lodervsm
    replied
    Thanks for your tips.

    I have reduced my gain in the last couple of days and seems that --gain 42.1 is a good compromise to my system. I also added an extra filter after the antenna. Now my max range has reached 311NM. I noticed that for my position somehow it helps to have a southerly wind for max range.

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  • abcd567
    replied
    @lodervsm

    Flightaware antenna is high gain antenna, and with ProStickPlus's built-in amplifier, strong signals from nearby planes may overload the tuner of the dongle, distort signal, and rejected by decoder software. The plane will not show.

    First try to reduce gain in steps. Say max (49.6), 45, 40, 35, 30, 25.

    For each setting observe for some period, say half an hour, to see how is the performance. You may find a setting where you get desired results.

    If above does not solve the problem, then you may need to add a filter. Yes, I know ProStick+ has a built-in filter, but it does not protect the front end amplifier chip, as it is located after the amplifier.

    You may also go through this thread:

    Find Out Existing RF Signals (Cell/Mobile/Pager etc) In Your Area

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  • lodervsm
    replied
    I recently switched from a 12 element colinear element antenna (DIY connected to 1m RG-179) to the flightaware antenna fitted to 5m CLF200 coax low loss cable. I noticed a significant increase in range of about 25NM approx. My max range is 240NM now. However I am noticing that I have lost reception of many aircraft below 1,000ft. I live just 2km away from the airport. I have flightaware pro stick plus as receiver connected to pi3. Any ideas what can I do to get the coverage below 1000ft back ?

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  • abcd567
    replied
    Originally posted by Rooster View Post
    Shame, as making stuff is really fun !!! Not to mention cheaper AND better than commercial gear... especially antennae !
    Unfortunately most ads-b hobbyists/data feeders are mainly interested in "rank", which is achived by using commercial equipment rather than DIY. They are least interested in fun of doing things themselves. Their focus is only on "how can I increas my rank above other feeders in my area?".

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  • abcd567
    replied
    As long as commercial antennas were very costly $100 to $300, most hobbyist were tempted to go for a DIY antenna costing almost free few $ only.

    When Flightaware marketed a 5.5 dBi antenna for $45, lot of hobbyists replaced their cocos and spiders by Flightware antenna.

    Now few think of a DIY antenna. They mostly go for Flightaware 26 inch antenna for $45 and Flightaware Pro Stick (which is a generic DVB-T + integral front-end RF pre-amplifier) for $16.

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  • Rooster
    replied
    Shame, as making stuff is really fun !!! Not to mention cheaper AND better than commercial gear... especially antennae !

    Leave a comment:


  • abcd567
    replied
    Originally posted by Rooster View Post
    Quiet in here again :-(
    Yes it is.....
    Frustrating.... This thread used to be so lively

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  • Rooster
    replied
    Quiet in here again :-(

    Leave a comment:


  • abcd567
    replied
    It is location of antenna which counts the most. With your airband antenna moved from indoors to roof, you will get big improvement


    Any 60 cm piece of wire or whip acts as a good Air Band antenna. Attaching groundplane (radials or disc) to shield of coax will improve further
    Last edited by abcd567; 2017-07-05, 23:43.

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  • AIR_UK
    replied
    Thanks for the replies.
    Just to clarify my question is with regards to antennas related to Airband receivers and was curious as to whether the Diamond D 777 provides a better performance as compared to Scanmaster Airmaster. Not that I have been disappointed with Scanmaster Airmaster as it performs very well indeed, but this is my first airband antenna so not sure how this compares with other antennas. I have now relocated my antenna to the roof of the house, so now in the process to see what the improvement is if any.

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  • Rooster
    replied
    The extra height will far outweigh the cable loss.

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  • abcd567
    replied
    Originally posted by AIR_UK View Post
    I have Scanmaster Airmaster antenna that’s positioned on a pole attached to my house about 10m off the ground. If I’m brave enough :-) I can get ladder to the apex of the roof and could re-position the antenna which would be at least 3m higher. I have not read the entire thread so not sure what the conclusion was. The coverage I have is good but always looking to see what I can do to improve reception. Is there an antenna that I could purchase that would be “significantly” better than my current setup without having to the move the antenna.

    Dedicated ADS-B antennas are designed and tuned for 1090 MHz

    Both the "Scanmaster Airmaster antenna" and "Diamond D 777 antenna" are designed for AIR BAND (117-140Mhz), almost 1/9 times the frequency of Air Band antennas.

    Better go for an antenna designed for ADS-B frequency of 1090 MHz.

    I use three different antennas with my 3 receivers
    (1) Flightaware 5 dBi, 26 inch antenna 1090 MHz purchased from Amazon.
    https://www.amazon.com/dp/B00WZL6WPO?tag=fligh01-20
    https://www.modmypi.com/electronics/...nna-66cm--26in


    (2) DIY 2 dBi, 1/4 wavelength groundplane antenna with slanting radials (Spider).
    3 EASY ANTTENNAS FOR BEGINNERS: EASY ANTENNA # 1 : SPIDER


    (3) DIY 2dBi, 1/4 wavelength horizontal disc groundplane + decoupling sleeve (Cantenna).
    3 EASY ANTTENNAS FOR BEGINNERS: EASY ANTENNA # 2 : CANTENNA

    Comparing three, the best performer is Flightaware 26 inch antenna.
    Spider and Cantenna are next and are at par.


    Originally posted by AIR_UK View Post
    Moving the antenna would of course result is using a longer coax cable, so not sure if that would be counter productive.
    Three meters extra coax will not make any significant additional attenuation, and should not be counter productive.
    .

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  • AIR_UK
    replied
    I have Scanmaster Airmaster antenna that’s positioned on a pole attached to my house about 10m off the ground. If I’m brave enough :-) I can get ladder to the apex of the roof and could re-position the antenna which would be at least 3m higher. I have not read the entire thread so not sure what the conclusion was. The coverage I have is good but always looking to see what I can do to improve reception. Is there an antenna that I could purchase that would be “significantly” better than my current setup without having to the move the antenna. Moving the antenna would of course result is using a longer coax cable, so not sure if that would be counter productive. For example would the Diamond D 777 be an improvement.

    Leave a comment:

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