{"id":278,"date":"2025-10-17T10:29:31","date_gmt":"2025-10-17T07:29:31","guid":{"rendered":"https:\/\/ta9ea.com\/?p=278"},"modified":"2025-10-17T10:29:31","modified_gmt":"2025-10-17T07:29:31","slug":"qo-100-jeostasyon-uydusu-araciligiyla-karasal-radyo-kanalinin-frekans-kararliligi-hakkinda","status":"publish","type":"post","link":"https:\/\/ta9ea.com\/?p=278","title":{"rendered":"QO-100 jeostasyon uydusu arac\u0131l\u0131\u011f\u0131yla karasal radyo kanal\u0131n\u0131n frekans kararl\u0131l\u0131\u011f\u0131 hakk\u0131nda"},"content":{"rendered":"

QO-100 (Phase4-A) jeostasyoner uydusu \u00fczerinden i\u015fletilecek bir karasal radyo kanal\u0131n\u0131n temel teknik gereksinimlerinden biri, g\u00f6nderme-alma yolunun frekans kararl\u0131l\u0131\u011f\u0131d\u0131r.<\/span><\/p>\n

CW ve sesli haberle\u015fme (SSB) s\u0131ras\u0131nda radyo kanal frekans\u0131n\u0131n yeterli kararl\u0131l\u0131\u011fa sahip olmamas\u0131, operat\u00f6r taraf\u0131ndan s\u00fcrekli manuel frekans ayarlamas\u0131 yap\u0131lmas\u0131n\u0131 gerektirebilir ve dijital haberle\u015fme s\u0131ras\u0131nda de\u011fi\u015fim protokol\u00fcn\u00fcn \u00e7\u00f6z\u00fclmesinin ve sonu\u00e7 olarak bir haberle\u015fme oturumunun ger\u00e7ekle\u015ftirilememesine yol a\u00e7abilir.<\/span><\/p>\n

1. Frekans dengesizli\u011finin kaynaklar\u0131n\u0131n belirlenmesi<\/span><\/strong><\/h3>\n

Bilindi\u011fi \u00fczere, QO-100 radyo kanal\u0131, 10489 MHz’de a\u015fa\u011f\u0131 ba\u011flant\u0131 al\u0131m\u0131 ve 2400 MHz’de a\u015fa\u011f\u0131 ba\u011flant\u0131 iletimi i\u00e7in tam \u00e7ift y\u00f6nl\u00fc \u00e7al\u0131\u015fma varsayar. Bu nedenle, frekans kararl\u0131l\u0131\u011f\u0131 gereklilikleri, daha y\u00fcksek frekansl\u0131 kanal, yani 10489 MHz al\u0131m kanal\u0131 i\u00e7in en kat\u0131 olacakt\u0131r.<\/span><\/p>\n

Radyo kanal\u0131, klasik (klasik \u00e7ift y\u00f6nl\u00fc VHF\/UHF al\u0131c\u0131-verici ile) veya SDR tasar\u0131m\u0131 kullan\u0131larak uygulanabilir, ancak her iki se\u00e7ene\u011fin de \u00e7\u00f6z\u00fcm prensipleri benzerdir.<\/span><\/p>\n

 <\/p>\n

\"\"<\/p>\n

Yap\u0131sal diyagramdan da g\u00f6r\u00fclebilece\u011fi gibi, al\u0131c\u0131 kanalda yaln\u0131zca iki frekans belirleyici eleman bulunur: LNB al\u0131c\u0131 d\u00f6n\u00fc\u015ft\u00fcr\u00fcc\u00fc ve SDR al\u0131c\u0131-verici. LNB’deki frekans belirleyici eleman, genellikle 25 MHz’lik bir kristal osilat\u00f6rd\u00fcr ve faz kilitli d\u00f6ng\u00fc (PLL) ile 390 kez \u00e7arp\u0131larak 9750 MHz’lik LNB yerel osilat\u00f6r frekans\u0131 elde edilir.<\/span><\/p>\n

Al\u0131c\u0131 kanaldaki ikinci frekans belirleyici eleman, 739 MHz frekans\u0131nda al\u0131m i\u00e7in \u00e7al\u0131\u015fan SDR al\u0131c\u0131-vericisinin 40 MHz kuvars kristal osilat\u00f6r\u00fcd\u00fcr.\u00a0<\/span><\/p>\n

Verici kanal\u0131nda yaln\u0131zca bir frekans belirleyici eleman bulunur; bu eleman, 2400 MHz iletim frekans\u0131nda \u00e7al\u0131\u015fan SDR al\u0131c\u0131-vericisinin 40 MHz kuvars kristal osilat\u00f6r\u00fcd\u00fcr.\u00a0<\/span><\/p>\n

Dolay\u0131s\u0131yla QO-100 radyo kanal\u0131n\u0131n frekans kararl\u0131l\u0131\u011f\u0131 nihayetinde iki unsur taraf\u0131ndan belirlenir:<\/span><\/p>\n

    \n
  • LNB’de \u2013 25 MHz frekansl\u0131 bir referans kristal osilat\u00f6r<\/span><\/li>\n
  • SDR al\u0131c\u0131-vericinin 40 MHz kuvars kristal osilat\u00f6r\u00fc vard\u0131r<\/span><\/li>\n<\/ul>\n

    LNB ve SDR al\u0131c\u0131-vericisindeki bu iki frekans belirleyici eleman\u0131n dar bant uydu transponderi \u00fczerinden \u00e7al\u0131\u015fma gereksinimlerini kar\u015f\u0131lamad\u0131\u011f\u0131 ve frekans kararl\u0131l\u0131\u011f\u0131 parametrelerinde \u00f6nemli iyile\u015ftirme gerektirdi\u011fi bir s\u0131r de\u011fildir.<\/span><\/p>\n

    Sorunun boyutunu belirlemek i\u00e7in bu iki unsurun ger\u00e7ek k\u0131sa vadeli frekans kararl\u0131l\u0131\u011f\u0131n\u0131n \u00f6l\u00e7\u00fcmlerini yapaca\u011f\u0131z ve teknik parametreleri iyile\u015ftirmek i\u00e7in olas\u0131 se\u00e7enekleri belirleyece\u011fiz.<\/span><\/p>\n

    Bir jenerat\u00f6r\u00fcn k\u0131sa d\u00f6nem frekans kararl\u0131l\u0131\u011f\u0131n\u0131 belirlemek i\u00e7in, Allan sapmas\u0131 (ADEV)* de\u011ferinin \u00f6l\u00e7\u00fclmesi gelenekseldir.<\/span><\/p>\n

    SDR al\u0131c\u0131-vericiler konusunda ise iki se\u00e7ene\u011fi de\u011ferlendirece\u011fiz: Analog Devices (ABD) firmas\u0131n\u0131n orijinal ADALM PLUTO\u2019su ve onun klonu PLUTO PLUS (\u00c7in).<\/span><\/p>\n

    \"\"<\/p>\n

     <\/p>\n

    2. \u00d6l\u00e7\u00fcm\u00a0<\/span><\/strong>stand\u0131<\/span><\/strong><\/h3>\n

    Allan sapmas\u0131n\u0131 \u00f6l\u00e7mek i\u00e7in a\u015fa\u011f\u0131daki ekipmanlara sahip bir \u00f6l\u00e7\u00fcm stand\u0131 kullan\u0131l\u0131r:<\/span><\/p>\n

      \n
    • Se\u00e7enek 19 ile Pendulum CNT-91 (Geli\u015fmi\u015f Frekans ve Zaman Aral\u0131\u011f\u0131 Analiz\u00f6r\u00fc)<\/span>
      \n(tau = 1 sn i\u00e7in k\u0131sa vadeli kararl\u0131l\u0131k < 1E(-10))<\/span><\/li>\n
    • GPIB\/USB aray\u00fcz\u00fc<\/span><\/li>\n
    • John Miles’\u0131n Windows 10 i\u00e7in KE5FX adl\u0131 TimeLab yaz\u0131l\u0131m\u0131<\/span><\/li>\n
    • Rohde&Schwarz NGE100 g\u00fc\u00e7 kayna\u011f\u0131<\/span><\/li>\n<\/ul>\n

      \"\"<\/p>\n

      3. LNB i\u00e7in Allan sapmas\u0131n\u0131n \u00f6l\u00e7\u00fclmesi<\/span><\/strong><\/h3>\n

      ADEV \u00f6l\u00e7\u00fcmlerini alal\u0131m:<\/span><\/p>\n

        \n
      • 25 MHz LNB kristal osilat\u00f6r\u00fc<\/span><\/li>\n
      • 10 MHz PQ-101 Anakart Referans\u0131 OCXO<\/span><\/li>\n
      • PQ-101 kart\u0131n\u0131n 25 MHz referans sinyali<\/span><\/li>\n
      • GPSDO LeoBodnar Mini \u00e7\u0131k\u0131\u015f\u0131ndan 10 MHz sinyali<\/span><\/li>\n<\/ul>\n

        \"\"<\/p>\n

        Yukar\u0131daki grafikte \u00f6l\u00e7\u00fclen Allan sapmas\u0131 (ADEV) de\u011ferleri g\u00f6sterilmektedir:<\/span><\/p>\n

          \n
        • ye\u015fil<\/span>\u00a0\u2013 25 MHz LNB kristal osilat\u00f6r\u00fc<\/span><\/li>\n
        • mavi<\/span>\u00a0\u2013 PQ-101 ana kart\u0131n\u0131n 10 MHz referans OCXO’su<\/span><\/li>\n
        • Raspberry<\/span>\u00a0\u2013 PQ-101 kart\u0131n\u0131n 25 MHz referans sinyali<\/span><\/li>\n
        • k\u0131rm\u0131z\u0131<\/span>\u00a0\u2013 GPSDO LeoBodnar Mini \u00e7\u0131k\u0131\u015f\u0131ndan 10 MHz sinyali<\/span><\/li>\n<\/ul>\n\n\n\n\n\n\n\n
          Sinyal<\/span><\/td>\nTau 100’ler i\u00e7in ADEV<\/span><\/td>\nADEV’in<\/span>
          \nGPSDO ile ili\u015fkisi<\/span><\/td>\n<\/tr>\n
          25 MHz LNB kristal osilat\u00f6r\u00fc<\/span><\/td>\n1.48E-8<\/span><\/td>\n299<\/span><\/strong><\/td>\n<\/tr>\n
          10 MHz PQ-101 Anakart Referans\u0131 OCXO<\/span><\/td>\n6.71E-11<\/span><\/td>\n1.35<\/span><\/td>\n<\/tr>\n
          PQ-101 kart\u0131n\u0131n 25 MHz referans sinyali<\/span><\/td>\n7.58E-11<\/span><\/td>\n1.53<\/span><\/td>\n<\/tr>\n
          GPSDO LeoBodnar Mini \u00e7\u0131k\u0131\u015f\u0131ndan 10 MHz sinyali<\/span><\/td>\n4.95E-11<\/span><\/td>\n1.00<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Bu, LNB referans osilat\u00f6r\u00fcn\u00fcn\u00a0GPSDO’dan yakla\u015f\u0131k\u00a0<\/span>299<\/span><\/strong>\u00a0kat daha az kararl\u0131, ayr\u0131ca PQ-101 anakart\u0131ndan gelen 25 MHz referans sinyalinden\u00a0<\/span>195 kat daha az kararl\u0131 oldu\u011fu anlam\u0131na geliyor.<\/span><\/strong><\/p>\n

          25 MHz’lik bir sinyalin 9750 MHz’lik bir yerel osilat\u00f6r sinyali \u00fcretmek i\u00e7in kullan\u0131ld\u0131\u011f\u0131 d\u00fc\u015f\u00fcn\u00fcld\u00fc\u011f\u00fcnde, al\u0131m s\u0131ras\u0131ndaki frekans sapmas\u0131n\u0131n mutlak standart sapmas\u0131 hesaplanabilir:<\/span><\/p>\n

            \n
          • standart (de\u011fi\u015ftirilmemi\u015f) LNB i\u00e7in = 9750 * 1E6 * 1.48E-8 = 144 Hz<\/span><\/li>\n
          • Ana karttan harici 25 MHz sinyalli modifiye edilmi\u015f bir LNB i\u00e7in PQ-101 = 9750 * 1E6 * 7.58E-11 = 0.73 Hz<\/span><\/li>\n<\/ul>\n

            Hesaplama yap\u0131l\u0131rken, Allan sapmas\u0131n\u0131n tepe de\u011ferinin, karek\u00f6k ortalamas\u0131ndan onlarca kat (ortalama olarak yakla\u015f\u0131k 30 ila 100 kat) farkl\u0131 olabilece\u011fi, yani LNB’nin de\u011fi\u015ftirilmemi\u015f bir versiyonunda tepe frekans sapmas\u0131n\u0131n 10 kHz’i a\u015fabilece\u011fi dikkate al\u0131nmal\u0131d\u0131r.<\/span><\/p>\n

            4. SDR Al\u0131c\u0131-Vericiler i\u00e7in Allan Sapmas\u0131n\u0131n \u00d6l\u00e7\u00fclmesi<\/span><\/strong><\/h3>\n

            ADEV \u00f6l\u00e7\u00fcmlerini alal\u0131m:<\/span><\/p>\n

              \n
            • 40 MHz SDR kristal osilat\u00f6r ADALM PLUTO (Analog Cihazlar)<\/span><\/li>\n
            • 40 MHz SDR kristal osilat\u00f6r PLUTO-PLUS (\u00c7in)<\/span><\/li>\n
            • PQ-101 ana kart\u0131n\u0131n 25 MHz referans sinyali<\/span><\/li>\n
            • GPSDO LeoBodnar Mini \u00e7\u0131k\u0131\u015f\u0131ndan 10 MHz sinyali<\/span><\/li>\n<\/ul>\n

               <\/p>\n

              \"\"<\/p>\n

               <\/p>\n

              Yukar\u0131daki grafikte \u00f6l\u00e7\u00fclen Allan sapmas\u0131 (ADEV) de\u011ferleri g\u00f6sterilmektedir:<\/span><\/p>\n

                \n
              • ye\u015fil<\/span>\u00a0\u2013 40 MHz referans kristal osilat\u00f6r SDR ADALM PLUTO (Analog Cihazlar)<\/span><\/li>\n
              • k\u0131rm\u0131z\u0131<\/span>\u00a0\u2013 40 MHz referans kristal osilat\u00f6r SDR PLUTO-PLUS (\u00c7in)<\/span><\/li>\n
              • mavi<\/span>\u00a0\u2013 PQ-101 ana kart\u0131n\u0131n 25 MHz referans sinyali<\/span><\/li>\n
              • Crimson<\/span>\u00a0\u2013 LeoBodnar Mini GPSDO \u00e7\u0131k\u0131\u015f\u0131ndan 10 MHz sinyali<\/span><\/li>\n<\/ul>\n\n\n\n\n\n\n\n
                Sinyal<\/span><\/td>\nTau 100’ler i\u00e7in ADEV<\/span><\/td>\nADEV’in<\/span>
                \nGPSDO ile ili\u015fkisi<\/span><\/td>\n<\/tr>\n
                ADALM PLUTO SDR referans kristal osilat\u00f6r\u00fc<\/span><\/td>\n4.55E-8<\/span><\/td>\n919<\/span><\/strong><\/td>\n<\/tr>\n
                SDR PLUTO-PLUS referans kristal osilat\u00f6r\u00fc<\/span><\/td>\n7.09E-10<\/span><\/td>\n14.3<\/span><\/td>\n<\/tr>\n
                PQ-101 kart\u0131n\u0131n 25 MHz referans sinyali<\/span><\/td>\n7.58E-11<\/span><\/td>\n1.53<\/span><\/td>\n<\/tr>\n
                GPSDO LeoBodnar Mini \u00e7\u0131k\u0131\u015f\u0131ndan 10 MHz sinyali<\/span><\/td>\n4.95E-11<\/span><\/td>\n1.00<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                Bu, ADALM PLUTO SDR al\u0131c\u0131-vericisindeki referans osilat\u00f6r\u00fcn\u00fcn\u00a0GPSDO’dan yakla\u015f\u0131k\u00a0<\/span>919<\/span><\/strong>\u00a0kat daha az kararl\u0131, ayr\u0131ca PQ-101 anakart\u0131ndan gelen 25 MHz referans sinyalinden de\u00a0<\/span>600 kat daha az kararl\u0131 oldu\u011fu anlam\u0131na geliyor.<\/span><\/strong><\/p>\n

                De\u011fi\u015ftirilmi\u015f bir SDR al\u0131c\u0131-vericide 2400 MHz iletim sinyali \u00fcretmek i\u00e7in 25 MHz sinyal kullan\u0131ld\u0131\u011f\u0131 d\u00fc\u015f\u00fcn\u00fcld\u00fc\u011f\u00fcnde, iletim s\u0131ras\u0131nda frekans sapmas\u0131n\u0131n mutlak standart sapmas\u0131 hesaplanabilir:<\/span><\/p>\n

                  \n
                • standart (de\u011fi\u015ftirilmemi\u015f) bir SDR al\u0131c\u0131-verici i\u00e7in = 2400 * 1E6 * 4.55E-8 = 109 Hz<\/span><\/li>\n
                • PQ-101 ana kart\u0131ndan harici 25 MHz sinyal alan de\u011fi\u015ftirilmi\u015f bir SDR al\u0131c\u0131-verici i\u00e7in = 2400 * 1E6 * 7.58E-11 = 0.18 Hz<\/span><\/li>\n<\/ul>\n

                  Hesaplama yap\u0131l\u0131rken, Allan sapmas\u0131n\u0131n tepe de\u011ferinin, k\u00f6k ortalama kare de\u011ferinden onlarca kat (ortalama olarak yakla\u015f\u0131k 30 ila 100 kat) kadar farkl\u0131 olabilece\u011fi, yani SDR al\u0131c\u0131-vericinin de\u011fi\u015ftirilmemi\u015f bir versiyonunda tepe frekans sapmas\u0131n\u0131n 10 kHz’i a\u015fabilece\u011fi dikkate al\u0131nmal\u0131d\u0131r.<\/span><\/p>\n

                  5. SDR\u00a0<\/span><\/strong>kiti\u00a0<\/span><\/strong>PQ\u00a0<\/span><\/strong>-101’deki\u00a0<\/strong>frekans sabitleme sorununun \u00e7\u00f6z\u00fcm\u00fc<\/strong><\/span><\/h3>\n

                  PQ-101 SDR kitinde, frekans stabilizasyonu sorunu, 10 MHz’de olduk\u00e7a kararl\u0131 bir OCXO’dan \u00fcretilen 25 MHz frekansl\u0131 bir referans sinyalinin sentezlenmesiyle \u00e7\u00f6z\u00fcl\u00fcyor.<\/span><\/p>\n

                  25 MHz’lik bir referans sinyali sentezlenirken, y\u00fcksek frekans kararl\u0131l\u0131\u011f\u0131na ek olarak d\u00fc\u015f\u00fck faz g\u00fcr\u00fclt\u00fcs\u00fc elde etmek \u00f6nemlidir. 25 MHz’lik bir referans sinyalinin 9750 MHz ile (390 kez) \u00e7arp\u0131lmas\u0131, faz g\u00fcr\u00fclt\u00fcs\u00fcn\u00fc 52 dB azalt\u0131r. Y\u00fcksek faz g\u00fcr\u00fclt\u00fcs\u00fc, al\u0131nan sinyalin sinyal-g\u00fcr\u00fclt\u00fc oran\u0131n\u0131 d\u00fc\u015f\u00fcrecek ve d\u00fc\u015f\u00fck enerjili sinyalleri maskeleyecektir.<\/span><\/p>\n

                  \u0130ki farkl\u0131 referans frekans\u0131 (SDR Pluto i\u00e7in 40 MHz ve LNB i\u00e7in 25 MHz) \u00fcretme ihtiyac\u0131n\u0131 ortadan kald\u0131rmak i\u00e7in PQ-101 SDR kiti, 25 MHz’lik tek bir referans sinyali \u00fcretir. Bu referans sinyali, donan\u0131mla de\u011fi\u015ftirilmi\u015f LNB’ye ve 25 MHz referans\u0131yla \u00e7al\u0131\u015facak \u015fekilde yeniden programlanm\u0131\u015f donan\u0131m ve yaz\u0131l\u0131mla de\u011fi\u015ftirilmi\u015f SDR PLUTO’ya iletilir.<\/span><\/p>\n

                  Bu \u00e7\u00f6z\u00fcm, ADALM PLUTO’nun frekans kararl\u0131l\u0131\u011f\u0131n\u0131 600 kat, LNB’nin frekans kararl\u0131l\u0131\u011f\u0131n\u0131 ise 195 kat art\u0131rmam\u0131z\u0131 sa\u011flad\u0131; yani sadece SSB ve CW’de de\u011fil, dar bantl\u0131 dijital modlarda da \u00e7al\u0131\u015fma i\u00e7in frekans kararl\u0131l\u0131\u011f\u0131 sorununu net bir \u015fekilde \u00e7\u00f6zd\u00fck.<\/span><\/p>\n

                  6. Sonu\u00e7lar:<\/span><\/strong>\u00a0<\/strong><\/p>\n

                    \n
                  • LNB ve SDR al\u0131c\u0131-verici i\u00e7in y\u00fcksek kaliteli bir OCXO’dan harici bir referans osilat\u00f6r kullanmak, hem al\u0131m hem de iletim i\u00e7in frekans kararl\u0131l\u0131\u011f\u0131 sorununa net bir \u00e7\u00f6z\u00fcm sa\u011flamak a\u00e7\u0131s\u0131ndan olduk\u00e7a mant\u0131kl\u0131d\u0131r<\/span><\/li>\n
                  • Asl\u0131nda, iyi bir OCXO referans osilat\u00f6r\u00fc, harici bir GPSDO ile ayn\u0131 d\u00fczeyde frekans kararl\u0131l\u0131\u011f\u0131na izin verir<\/span><\/li>\n
                  • PQ-101 ana kart\u0131 ayr\u0131ca harici bir GPSDO’dan (iste\u011fe ba\u011fl\u0131 olarak) \u00e7al\u0131\u015fma yetene\u011fine de sahiptir<\/span><\/li>\n
                  • LNB’deki kuvars rezonat\u00f6r\u00fcn\u00fcn TCXO ile de\u011fi\u015ftirilmesi, \u00f6zellikle LNB a\u00e7\u0131k havada \u00e7al\u0131\u015ft\u0131r\u0131l\u0131yorsa, frekans kararl\u0131l\u0131\u011f\u0131 sorununu tam olarak \u00e7\u00f6zemez.<\/span><\/li>\n
                  • \u00c7in PLUTO-PLUS’taki 40 MHz referans osilat\u00f6r\u00fc, yerli ADALM PLUTO’ya g\u00f6re \u00f6nemli \u00f6l\u00e7\u00fcde daha iyi (\u015fa\u015f\u0131rt\u0131c\u0131!!!)<\/span><\/li>\n
                  • Referans sinyalinin frekans kararl\u0131l\u0131\u011f\u0131 konusu ele al\u0131nd\u0131\u011f\u0131nda, al\u0131c\u0131 sinyalin sinyal-g\u00fcr\u00fclt\u00fc oran\u0131n\u0131n bozulmas\u0131n\u0131 \u00f6nlemek ve iletim s\u0131ras\u0131nda temiz bir spektrum elde etmek i\u00e7in \u00fcretilen referans sinyalinin faz g\u00fcr\u00fclt\u00fcs\u00fcn\u00fcn kontrol edilmesi gerekir.<\/span><\/li>\n
                  • GPSDO ve OCXO Kar\u015f\u0131la\u015ft\u0131rmas\u0131: OCXO yerine, GPSDO olduk\u00e7a kararl\u0131 bir referans osilat\u00f6r\u00fc olarak kullan\u0131labilir. Bu \u00e7\u00f6z\u00fcmlerin her birinin kendine \u00f6zg\u00fc avantajlar\u0131 ve dezavantajlar\u0131 vard\u0131r. Bunlar\u0131 belirli bir g\u00f6reve g\u00f6re ele alal\u0131m.<\/span>\n
                      \n
                    • OCXO’nun Art\u0131lar\u0131 \/ GPSDO’nun Eksileri<\/span>\n
                        \n
                      • A\u00e7\u0131k g\u00f6ky\u00fcz\u00fcn\u00fcn olmad\u0131\u011f\u0131 yerlerde \u00e7al\u0131\u015fmak<\/span><\/li>\n
                      • Pencere a\u00e7\u0131kl\u0131klar\u0131na ba\u011flant\u0131 yoktur, pencere a\u00e7\u0131kl\u0131klar\u0131ndan mesafe k\u0131s\u0131tlamas\u0131 yoktur<\/span><\/li>\n
                      • QO-100 uygulamalar\u0131 i\u00e7in GPSDO ile yakla\u015f\u0131k olarak kar\u015f\u0131la\u015ft\u0131r\u0131labilir frekans kararl\u0131l\u0131\u011f\u0131<\/span><\/li>\n
                      • PQ-101 iletimi \u00fczerinde \u00e7al\u0131\u015f\u0131rken GPS kanal\u0131n\u0131n “t\u0131kanmas\u0131” sorunu ya\u015fanmaz<\/span><\/li>\n
                      • GPSDO’ya k\u0131yasla daha d\u00fc\u015f\u00fck faz g\u00fcr\u00fclt\u00fcs\u00fc (GPSDO t\u00fcr\u00fcne ba\u011fl\u0131 olarak)<\/span><\/li>\n<\/ul>\n<\/li>\n
                      • GPSDO’nun Art\u0131lar\u0131 \/ OCXO’nun Eksileri<\/span>\n
                          \n
                        • Daha d\u00fc\u015f\u00fck g\u00fc\u00e7 t\u00fcketimi (GPSDO i\u00e7in yakla\u015f\u0131k 1 W ve OCXO i\u00e7in 1,5 W)<\/span><\/li>\n
                        • Y\u00fcksek frekans do\u011frulu\u011fu ve kararl\u0131l\u0131\u011f\u0131<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                          7. Mazeretler<\/span>
                          \n<\/strong><\/p>\n

                            \n
                          • \u00d6l\u00e7\u00fcmler k\u00fc\u00e7\u00fck bir \u00f6rneklemle ger\u00e7ekle\u015ftirildi – yaln\u0131zca bir ADALM PLUTO, bir PLUTO-PLUS ve bir LNB SR-3602ACE<\/span><\/li>\n
                          • Se\u00e7enek 19 k\u0131sa vadeli frekans kararl\u0131l\u0131\u011f\u0131 CNT-91 i\u00e7in s\u0131n\u0131rlamalar (\u00f6l\u00e7\u00fcm e\u015fikleri):<\/span>\n
                              \n
                            • 1E-10 tau’da = 1 sn<\/span><\/li>\n
                            • 1E-11 tau’da = 10 saniye<\/span><\/li>\n
                            • 1E-12 tau’da = 100 saniye<\/span><\/li>\n
                            • vesaire.<\/span><\/li>\n<\/ul>\n<\/li>\n
                            • \u00d6l\u00e7\u00fcmlerden \u00f6nce, t\u00fcm \u00f6l\u00e7\u00fcm ekipmanlar\u0131 en az 6 saat \u0131s\u0131t\u0131ld\u0131. \u00d6l\u00e7\u00fclen cihazlar (LNB’ler ve SDR al\u0131c\u0131-vericiler) ise, \u00e7al\u0131\u015fma modunda 1 saatlik bir \u0131s\u0131nma s\u00fcresinin ard\u0131ndan \u00f6l\u00e7\u00fcld\u00fc.<\/span><\/li>\n
                            • T\u00fcm \u00f6l\u00e7\u00fcmler +23 C oda s\u0131cakl\u0131\u011f\u0131nda ger\u00e7ekle\u015ftirildi. -30\u2026+50 C s\u0131cakl\u0131k aral\u0131\u011f\u0131ndaki iklimlendirme odas\u0131nda \u00f6l\u00e7\u00fcm yap\u0131lmad\u0131.\u00a0<\/span><\/li>\n
                            • GPSDO’nun \u00f6l\u00e7\u00fclen Allan sapmas\u0131, GPS anteninin a\u00e7\u0131k alanda de\u011fil, g\u00f6ky\u00fcz\u00fcn\u00fcn ikinci yar\u0131m k\u00fcresi evin duvar\u0131 ile kapal\u0131 olan bir klima \u00fczerinde konumland\u0131r\u0131lmas\u0131ndan dolay\u0131 y\u00fcksek olabilir.<\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

                              QO-100 (Phase4-A) jeostasyoner uydusu \u00fczerinden i\u015fletilecek bir karasal radyo kanal\u0131n\u0131n temel teknik gereksinimlerinden biri, g\u00f6nderme-alma yolunun frekans kararl\u0131l\u0131\u011f\u0131d\u0131r. CW ve sesli haberle\u015fme (SSB) s\u0131ras\u0131nda radyo […]<\/p>\n","protected":false},"author":1,"featured_media":280,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4],"tags":[],"class_list":["post-278","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hamrad","category-qo100"],"_links":{"self":[{"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/posts\/278","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=278"}],"version-history":[{"count":0,"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/posts\/278\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/"}],"wp:attachment":[{"href":"https:\/\/ta9ea.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=278"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=278"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=278"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}