After a lot of experimenting I found another interesting characteristic of FETs well known in the audio amplifier scene as I found out latter – when you parallel two identical FETs you get lower NF than with a single device! The FET operates at Idss as this is the best operating point for lowest noise Idss is specified to be between 2 to 18 mA – I never got the 2 mA devices, the most common Idss was from 10 to 15 mA. Argy, ‘Poke Her Flat’: Anyway, the circuit stays open for further optimization The most critical part of the design is the transformer Tr1:
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The IP3 problem was solved with proper output matching – the 3: Be respectful, keep it civil and stay on topic. Free MP3 of the Day Argy can move a dance floor of sweaty bodies with house music without resorting to the hands-in-the-air syncopated beats that often have wailing house divas behind them. More than 40 LNA’s were measured in feb. Misc Sep 13, PanaVise 1000n car mount keeps a fierce grip on phones With its thick plastic arms and strongly llna hinges, the PortaGrip car mount won’t be easily dislodged from a windshield or broken in the automotive environment.
The amplifiers can be approximately 100n for minimum NF without instruments with a little trick: At the first attempt I just piggy-backed four BF’s but some weak oscillations occured above 3,5 GHz not affecting the amplifier characteristics on the working frequency.
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This website is using cookies. In order to use them effectivelly although I don’t recommend using preamplifiers at all one shoul add an attenuator at the output to lower lma gain. The output combining transformer Tr2 has 2 turn bifiliar winding. The core for the Tr1 should be of a larger size material U17, size A4 when more than one BF is to be installed.
Misc by Antuan Goodwin Apr 25, After a la of experimenting I found another interesting characteristic of FETs well known in the audio amplifier scene as I found out latter – when you parallel two identical FETs you get lower NF than with a single device! Viper SmartKey unlocks cars with hands-free ease, but requires alarm. It turned out that the amplifier has stability problems when terminated with narrowband filter as this is the case in XVRT.
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The circuit is actually the push-pull arrangement of two circuits from Fig. Input coil L1 is wound on 11 mm diameter core with 1,0 mm AgCu wire; it has 4 turns with a 010n length of 7 mm.
The most critical part of the design is the transformer Tr1: This data is from feb.
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You are downloading trial software. Argy can move a dance floor of sweaty bodies with house music without resorting to the hands-in-the-air syncopated beats that often have wailing house divas behind them. Tuning is not critical as the input is very broad in the sense of minimum noise something like 10 MHz. Anyway, the circuit stays open for further optimization The coil should be mounted mm above the ground and at least 10 mm from any metal wall.
Input coil L1 is 100j on 5 mm diameter core with 1,0 mm AgCu wire; it has 10n turns with a total length of 11 mm.
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The LNA from Fig. This is not bad but it should be better.
Trimmer capacitor should be of high quality. Furthermore, installing the wrong Billionton drivers can make these problems even worse. The input and output matching are different see text.
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After that modification the oscillations disappeared but it should be noted that all the designs described here are only conditionaly stable. As a by-product of this modification the 1dB improvement in input IP3 was acheived. To get the 0,5 dB of NF the input pna be tapped to the L1 at the middle that is at the 3rd turn. News Blog Facebook Twitter Newsletter.