Announcement

Collapse
No announcement yet.

best antenna

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Happy New Year 2015 !!

    Comment


    • Happy new year all.

      hopefully just that piece of hardware and whatever software that runs it is all that is needed. Worst case you use the TV dongle as analyser,but that hardware will solve you source signal problem.
      T-EGLF8

      Comment


      • happy new year to all .. and abcd567 hi sir ! im thinking to add inline amp to my 1090mhz antenna so i bought a LNB from local vendor and its got 2xR24(2SC3356) and some stupid circuit and i tried with rtl and made my own power injector using 600ohm resistor instead of coil since i donno how to make it (help here also appreciated). and started my sdrsharp to see difference.. but to my wonder it was the same even i gave the power to amp or not.. no gain at all.. so i dismantled it and secured R24 resistors. so can you please provide a small amp circuit for R24 (2SC3356). searched internet but couldn't find one :/ thanks,.
        RTL SDR : T-VEVZ1

        Comment


        • Originally posted by charan View Post
          happy new year to all .. and abcd567 hi sir ! im thinking to add inline amp to my 1090mhz antenna so i bought a LNB from local vendor and its got 2xR24(2SC3356) and some stupid circuit and i tried with rtl and made my own power injector using 600ohm resistor instead of coil since i donno how to make it (help here also appreciated). and started my sdrsharp to see difference.. but to my wonder it was the same even i gave the power to amp or not.. no gain at all.. so i dismantled it and secured R24 resistors. so can you please provide a small amp circuit for R24 (2SC3356). searched internet but couldn't find one :/ thanks,.
          Hi charan!
          I could not find any amplifier circuit for 2SC3356 transistor, but found two circuits using BFP420 Transistor.

          Source: http://www.lll.lu/~edward/edward/ads...DSBpremap.html
          LNA-1R.PNG Preamp 3 Res Sma.jpg


          Source: https://blackbirdengineering.wordpre...lna-for-ads-b/
          LNA-2.png


          I don't understand why you purchased Satellite Dish LNB, and then from it's parts want to make LNA for ADS-B? You can directly purchase satellite in Line amplifier cheaper than satellite dish LNB. I am sure in Line amplifiers are available in satellite dish antenna shops in your area. In case you canot find in stores in your neighborhood, try eBay India links below.

          Indian Rs 2,250 : http://geb.ebay.in/g/ImportHubViewIt...llite-FTA-Coax
          Aska in Line Amp.JPG


          Indian Rs 8,687: http://geb.ebay.in/g/ImportHubViewIt...Amplifier-D903
          RCA in Line Amp.JPG
          Last edited by abcd567; 2015-01-03, 22:56.

          Comment


          • Originally posted by abcd567 View Post
            Hi charan!
            I could not find any amplifier circuit for 2SC3356 transistor, but found two circuits using BFP420 Transistor.

            Source: http://www.lll.lu/~edward/edward/ads...DSBpremap.html
            [ATTACH=CONFIG]5325[/ATTACH]


            Source: https://blackbirdengineering.wordpre...lna-for-ads-b/
            [ATTACH=CONFIG]5326[/ATTACH]


            I don't understand why you purchased Satellite Dish LNB, and then from it's parts want to make LNA for ADS-B? You can directly purchase satellite in Line amplifier cheaper than satellite dish LNB. I am sure in Line amplifiers are available in satellite dish antenna shops in your area. In case you canot find in stores in your neighborhood, try eBay India links below.

            Indian Rs 2,250 : http://geb.ebay.in/g/ImportHubViewIt...llite-FTA-Coax
            [ATTACH=CONFIG]5327[/ATTACH]


            Indian Rs 8,687: http://geb.ebay.in/g/ImportHubViewIt...Amplifier-D903
            [ATTACH=CONFIG]5328[/ATTACH]
            Thanks because its too costly for me. i already ordered BFP420.. Thanks !
            RTL SDR : T-VEVZ1

            Comment


            • Originally posted by charan View Post
              Thanks because its too costly for me. i already ordered BFP420.. Thanks !
              Some tips for assembling the amplifier with very small (SMT) components:
              (1) capacitors are damaged by too much heat when soldering iron is applied for too long when they are soldered and therefore the gain drops too much due to very small serial capacitor that rests.
              (2) a bad soldering can create a short-circuit.
              (3) RF design include proper layout. If layout is not carefully done, performance can be poor. (You don't have to worry about it as layout design is already done for schematics I have given in the last post. Visit their web pages for details of circuit board layout)

              Comment


              • @charan:

                Another Amplifier circuit from Infineon (Siemens), one of the manufacturers of transistor BFP420

                Source: http://www.infineon.com/dgdl/AN018.p...1427688a990761

                Infineon-Siemens BFP420-900 MHz Amplifier-1.PNG Infineon-Siemens BFP420-900 MHz Amplifier-2.PNG

                Comment


                • Originally posted by charan View Post
                  Thanks because its too costly for me. i already ordered BFP420.. Thanks !
                  To make the printed circuit board accurately according to design is a tricky job, particularly if you dont have proper tools. The pcb can be made by a knife only using cut & scrach, but to achieve accuracy by this simple method is difficult.

                  Try local satellite dish stores in your area. These may have low priced satellite amplifers. The eBay prices were high because sellers were located in USA. Try these Indian manufacturers near your city:

                  Chennai: http://m.indiamart.com/proddetail.php?i=6850073662

                  Bangaluru: http://m.indiamart.com/proddetail.php?i=7113240312

                  New Delhi (Indian Rs 400): http://m.indiamart.com/proddetail.php?i=5675435873

                  Comment


                  • Originally posted by abcd567 View Post
                    To make the printed circuit board accurately according to design is a tricky job, particularly if you dont have proper tools. The pcb can be made by a knife only using cut & scrach, but to achieve accuracy by this simple method is difficult.

                    Try local satellite dish stores in your area. These may have low priced satellite amplifers. The eBay prices were high because sellers were located in USA. Try these Indian manufacturers near your city:

                    Chennai: http://m.indiamart.com/proddetail.php?i=6850073662

                    Bangaluru: http://m.indiamart.com/proddetail.php?i=7113240312

                    New Delhi (Indian Rs 400): http://m.indiamart.com/proddetail.php?i=5675435873
                    Fantastic sir really thanks a lot will buy one will let you know thanks again
                    RTL SDR : T-VEVZ1

                    Comment


                    • Originally posted by abcd567 View Post
                      Some tips for assembling the amplifier with very small (SMT) components:
                      (1) capacitors are damaged by too much heat when soldering iron is applied for too long when they are soldered and therefore the gain drops too much due to very small serial capacitor that rests.
                      (2) a bad soldering can create a short-circuit.
                      (3) RF design include proper layout. If layout is not carefully done, performance can be poor. (You don't have to worry about it as layout design is already done for schematics I have given in the last post. Visit their web pages for details of circuit board layout)
                      can i make the above provided circuit like this? i have this kind of pcb's available.. and thats a J-Pole antenna and made 4 rounds of the default RG174 to work as balun.. will it work? (i got little more range like 2nmi) and this antenna is giving the same result as 8-1/4 COCO antenna.. so is this okay? or coco should have more gain?
                      IMG_20150104_122508334_HDR.jpgIMG_20150104_122521697_HDR.jpgIMG_20150104_122531509.jpg
                      RTL SDR : T-VEVZ1

                      Comment


                      • @abcd567
                        and my range plots with coco and jpole better range with jpole infact.. any suggestions?
                        coco.jpgjpole.jpg
                        RTL SDR : T-VEVZ1

                        Comment


                        • @abcd567
                          i ordered this..
                          http://www.shopclues.com/ila-20-20db...reception.html
                          RTL SDR : T-VEVZ1

                          Comment


                          • Originally posted by charan View Post
                            can i make the above provided circuit like this? i have this kind of pcb's available.. and thats a J-Pole antenna and made 4 rounds of the default RG174 to work as balun.. will it work? (i got little more range like 2nmi) and this antenna is giving the same result as 8-1/4 COCO antenna.. so is this okay? or coco should have more gain?
                            [ATTACH=CONFIG]5336[/ATTACH][ATTACH=CONFIG]5337[/ATTACH][ATTACH=CONFIG]5338[/ATTACH]
                            I dont see why not, its never going to be pretty but it should work.
                            T-EGLF8

                            Comment


                            • Originally posted by charan View Post
                              Looks good, you also need a DC injector (to get power into the amp), DC blocker ( to go between the amp and the antenna) and a power supply of around 15v @ 100ma (current can be higher, but voltage is normally between 12-18v for these amps, unless it specifies otherwise)
                              Ben.
                              FR24 F-EGLF1, Blitzortung station 878, OGN Aldersht2, PilotAware PWAldersht, PlanePlotter M7.

                              Comment


                              • Originally posted by charan View Post
                                GREAT! only Indian Rs 200 = US $3.16 !
                                Now purchase or make a power inserter & DC blocker. I think you are skilled enough to make these. What you need is 2 Coax splitters, 2 capacitor any value from 100pF to 470pF, and 1 inductor any value from 2 uH to 10 uH.
                                Last edited by abcd567; 2015-01-04, 18:34.

                                Comment

                                Working...
                                X