10382Re: [loopantennas] Searching for a very low noise wideband loop preamp
- Jan 9, 2014http://www.ebay.com/itm/LNA-UKW-FM-RADIO-88-108-MHZ-VHF-3M-4M-super-low-noise-amplifier-NF-0-4dB-18dB-/111249275393?pt=LH_DefaultDomain_0&hash=item19e6f93a01.
73HoracioUruguay2014/1/9 Chris Trask <christrask@...>>Loop Antenna News and Information Forum
>From: "Jose A. Kucher" <saguillar@...>
>Sent: Jan 8, 2014 5:14 AM
>Subject: [loopantennas] Searching for a very low noise wideband loop preamp
>I just uploaded a revised version of my sketches of low-voltage active antenna amplifiers into the group files section:
>Low noise preamp for wideband loop
>Friends im searching for a very low noise wideband loop preamp,
>is for use in areas with very weak Mw signals, my loop is a 3mt
>diameter wire loop and im testing the preamp with two 2n2222.
>this preamp have noise in order the signals i want to receive, the
>preamp can receive it, but adding a strong noise floor
Active Antenna Amplifiers for Low Voltage Operation RevA.pdf
They are oriented towards 1.5V applications, but can be used at higher voltages. The first two schematics require that the transistors be parts of a monolithic array, such as the CA3046 or HFE3046. The third schamatic includes feedback for correcting the imbalance when using unmatched transistors, such as individual 2N2222s.
N7ZWY / WDX3HLB
Senior Member IEEE
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