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SF METEO

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Homebrew Airband Receiver with DDS

Low Noise Amplifier

The Main Design Goal was 'fast', so we used a bookshelf-solution.
The first amplifier was chosen because of it's low NF of 2.4 dB and
Gain approx. 20 dB

The second amplifier was chosen because of it's high Output Power of
approx. 18 dBm

The calculated overall NF is 2.44 dB and the Gain is 33 dB.

The attached Lowpass is not necessary, that was just for test purposes ...

Schematics

Component Data

Name	Value	Construction Details
L1	600 Z	Murata BLM31AJ601SN1L
L2	600 Z	Murata BLM31AJ601SN1L
A1	Gali-39+	Mini Circuits
A2	Gali-6+	Mini Circuits
C1	1 nF	Farnell / 1206
C2	1 nF	Farnell / 1206
C3	100 nF	Farnell / 1206
C4	1 nF	Farnell / 1206
C5	100 nF	Farnell / 1206
R1	160 Ω	Farnell / 1206
R2	160 Ω	Farnell / 1206
R3	2 x 36 Ω	Farnell / 1206
R4	2 x 36 Ω	Farnell / 1206
LP	SLP-150	Mini Circuits

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