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en:lna [2013/07/24 21:18] – [Tuning] kakliken:lna [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
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 {{:cs:lna01a_transmission_curve.jpg?direct&200|LNA01A transmission curve}} {{:cs:lna01a_transmission_curve.jpg?direct&200|LNA01A transmission curve}}
  
-A coil performing on 144Mhz has 7 turns of 0.5mm wire around a rod with a diameter of 4mm (__a drill__). The coil is ..? +A coil performing on 144Mhz has 7 turns of 0.5mm wire around a rod with a diameter of 4mm (__a drill__). The coil is stretched as seen in the pictureThe capacitors C1 and C2 have the capacitance of 8,2 pF. It is not necessary to use a feedback on LNA, as it increases the __s/n ratio__ and decreases the gain by approximately 1dB. A trim is replaced by a 45 Ω resistor and the total current through the LNA should be around 153mA. The current through source transistor is than about 135mA. 
- +
-Cívka pro naladění na 143 MHz vychází 7 závitů z měděného drátu průměru 0,5 mm motáno na průměr tyčky 4mm (vrták). Cívka je roztažená tak jak je vidět na fotografii. Kondenzátory C1 C2 jsou 8,2 pF. Zpětná vazba u LNA není potřebapouze zvyšuje šumové číslo a snižuje zisk asi o 1dB. Trim je nahrazen odporem  45 Ω a celkový proud celým LNA by měl být kolem 153mA, potom je proud Source tranzistoru asi 135mA.+
  
 ====== The measured parameters ====== ====== The measured parameters ======
  
-{{:cs:prenos.png?200|}}+{{:cs:rf:lna01a.png?400|Transmission characteristic of LNA01A preamplifier.}}
  
 {{:cs:lna_-10dbm_in.png?200|}} {{:cs:lna_-10dbm_in.png?200|}}
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 ===== Covering ===== ===== Covering =====
  
-The module fits into __metallic tin shielding can__ [[http://www.gme.cz/plechove-krabicky-stinici-cinovane/u-ah101-p622-024/|U-AH101]]+The module fits into metallic shielding box[[http://www.gme.cz/plechove-krabicky-stinici-cinovane/u-ah101-p622-024/|U-AH101]]
  
  
en/lna.1374700686.txt.gz · Last modified: 2013/07/24 21:18 (external edit)