137 MHz 144MHzBF981 et BF966 Silicon N-channel dual-gate MOS-FETs Short channel transistor with high...
Transcript of 137 MHz 144MHzBF981 et BF966 Silicon N-channel dual-gate MOS-FETs Short channel transistor with high...
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PRE-AMPLIFICATEUR● 137 MHz● 144MHz
A base de BF998 Silicon N-channel dual-gate MOS-FETs
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Préamplificateur VHFDesign F6BCU
● BF 998 digne successeur des BF980, BF981 et BF966
● Silicon N-channel dual-gate MOS-FETs● Short channel transistor with high forward
transfer admittance to input capacitance ratio
● Low noise gain controlled amplifier up to 1 GHz
BF998 sur Ebay 4,60€ les 50 port compris
Condensateur variable 10pF 4,10€ port compris
Tore
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Préampli 137MHz
BF 998
5 mm
Prise à 2 spires côté froid
Prise à 2 spires côté froid
Clinquant en cuivre
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Modifications et mesures● Tension d’alimentation 8V
● Vds = 7,3V
● Vg2s = 3,0V
● Id = 3 mA
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Réglage facilité par l’utilisation d’un analyseur de spectre, d’un nanovna ou d’un gip-dip
I = 3mA sous 12V
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P1 = 1μWP2 = 204μWGain (dB) = 10*log(P2/P1)Gain=23 dB pour 26 dB annoncé
Mesures (appareil construction maison non étalonné)
P(mW) = 1mW 10(P(dBm)/ 10)⋅10(P(dBm)/ 10)
Projet Milliwatt
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Merci pour votre attention
Radio-Club de la Haute Ile Page perso de F6BCU