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  • I just finished building the collinear out of LDF1-50. It's an 8 and a half element antenna with a shorted top whip. I like the idea of the DC short in the design as it will prevent static buildup on the center conductor however it's still resonant at 1090 MHz... the magic of antennas!

    The first collinear I built was out of RG59 and it didn't work very well... its first test was in my basement which is below ground. It picked-up nothing down there which I now know as a sign it wasn't going to work very well at all.

    Now the new LDF1-50 collinear was carefully constructed and even a sleeve balun in the base added & cut to a 1/4 wave. I just tested the new LDF1-50 collinear antenna in my basement, it's 3AM Monday morning and the quietest time of the week for air traffic... guess what? It was picking up aircraft ... quite a few of them down in the basement... the antenna seems to be very sensitive! If it doesn't rain tomorrow I will be up the tower and installing it. I now have N connectors for the LDF1-50. Here are some photos... I'll take some tomorrow of the new antenna installation and cabling...

    http://ads-b.ca/LDF1-50/super-antenna/
    Last edited by 1090 MHz; 2014-06-09, 08:29.
    www.ADS-B.ca

    Comment


    • Originally posted by 1090 MHz View Post
      I just finished building the collinear out of LDF1-50. ......... I will be up the tower and installing it. I now have N connectors for the LDF1-50. Here are some photos... I'll take some tomorrow of the new antenna installation and cabling...

      http://ads-b.ca/LDF1-50/super-antenna/
      Good work. I am sure this antenna will give you excellent results, and payback all the pains and care you have taken to construct it.

      Comment


      • Originally posted by F-EGLF1 View Post
        According to the ARRL handbook ferrite chokes are only of any use at frequencies below 144MHz (Section 15.1.4) this is due to the ferrite material responding differently at higher frequencies.
        Ben.
        Originally posted by 1090 MHz View Post
        Ferrite chokes are actually good for frequencies up to around 1000 MHz. It all depends of what type of material the ferrite bead is made from.

        Ferrite beads are used for RF decoupling and parasitic suppression. When placed over a coaxial cable they prevent RF from flowing on the outside of the shield but do not affect the signal inside the cable.........
        Fair-Rite Catalog | http://fair-rite.com/cgibin/catalog.pgm#select:freq5

        .

        Comment


        • http://ads-b.ca/LDF1-50-super-antenna/

          Super Antenna install .... seems to be working well. Picking up flights down to Indiana ... that's a new record!
          www.ADS-B.ca

          Comment


          • Originally posted by 1090 MHz View Post
            http://ads-b.ca/LDF1-50-super-antenna/

            Super Antenna install .... seems to be working well. Picking up flights down to Indiana ... that's a new record!
            Wow! Great installation of super antenna. Why not you plot receiver range on VRS after running it for couple of hours and post the screenshot?
            By the way, I liked your photo on tower (as shadow).

            Comment


            • Ive found that ferrites used as a choke (threaded onto coax outer) are of little use above 70cm (433Mhz)

              YES there are ferrites that can operate to higher frequencies, but would require multiple turns THROUGH the ferrite - in this case there isnt even one turn !

              Comment


              • Originally posted by Rooster View Post
                Ive found that ferrites used as a choke (threaded onto coax outer) are of little use above 70cm (433Mhz)

                YES there are ferrites that can operate to higher frequencies, but would require multiple turns THROUGH the ferrite - in this case there isnt even one turn !
                You mean like these?
                ferrite chokes 4.png

                ferrite chokes 2.PNG


                Are big internal diameter ones available for 1000 MHz (material/mix 61) ????

                Comment


                • Bead type are also commonly used

                  ARRL-Fig 15.11-Rev.png

                  bead ferrite 1.png

                  bead ferrite 2.jpg

                  Comment


                  • Originally posted by abcd567 View Post
                    Wow! Great installation of super antenna. Why not you plot receiver range on VRS after running it for couple of hours and post the screenshot?
                    By the way, I liked your photo on tower (as shadow).
                    Glad you like the "Shadow" photo! I've been testing the new Super Antenna the past few days and I have to say I'm really happy with the results. For an antenna that I built from scratch, with just the calculations, its got great sensitivity both high up in the sky and right down to the ground at the airport.
                    www.ADS-B.ca

                    Comment


                    • Did anyone catch the Hamilton Skyfest Airshow?

                      I couldn't believe my eyes when I saw a WWII Avro Lancaster flying around on my ADS-B radar last night!

                      airshow.jpg

                      http://www.warplane.com/upcoming-eve...spx?eventId=25
                      www.ADS-B.ca

                      Comment


                      • Originally posted by 1090 MHz View Post
                        Did anyone catch the Hamilton Skyfest Airshow?

                        I couldn't believe my eyes when I saw a WWII Avro Lancaster flying around on my ADS-B radar last night!

                        [ATTACH=CONFIG]4284[/ATTACH]

                        http://www.warplane.com/upcoming-eve...spx?eventId=25
                        Oh, I missed it. Was it in Burlington?
                        The page says "Sorry this event has already taken place or no longer exists. (EventId=25)"

                        Comment


                        • Originally posted by abcd567 View Post
                          Oh, I missed it. Was it in Burlington?
                          The page says "Sorry this event has already taken place or no longer exists. (EventId=25)"
                          Try this link ... http://learntofly.ca/hamilton-night-...-skyfest-2014/
                          It was at the Hamilton Airport.
                          www.ADS-B.ca

                          Comment


                          • Originally posted by 1090 MHz View Post
                            Try this link ... http://learntofly.ca/hamilton-night-...-skyfest-2014/
                            It was at the Hamilton Airport.
                            Playback http://www.flightradar24.com/2014-06.../CGVRA/395120e

                            Comment


                            • Originally posted by 1090 MHz View Post
                              Try this link ... http://learntofly.ca/hamilton-night-...-skyfest-2014/
                              It was at the Hamilton Airport.
                              Thanks guys. Both the Hamilton Airshow & FR24 playback pages were very interesting.
                              I have forgotten that FR24 has a playback capability.

                              Comment


                              • Originally posted by 1090 MHz View Post
                                Did anyone catch the Hamilton Skyfest Airshow?

                                I couldn't believe my eyes when I saw a WWII Avro Lancaster flying around on my ADS-B radar last night!

                                [ATTACH=CONFIG]4284[/ATTACH]

                                http://www.warplane.com/upcoming-eve...spx?eventId=25
                                Wow, a very high tech WW2 plane! ADS-B equipped!

                                Comment

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