Getting the most from your G4DDK VLNA - NTMS

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23cm <strong>VLNA</strong> 2 • Work by Sergie, RW3BP – 0.14dB noise figure based on Skobelev feed cold sky source – Unconditional stability – Good input return loss
Initial attempts to improve performance • Use MGF4919 • Remove drain resistor • Increase source lead inductance
Page 1 and 2: Getting the most from your G4DDK VL
Page 3 and 4: WD5AGO 23cm pre-amp
Page 5 and 6: 23cm VLNA
Page 7: Gain results for 23cm VLNA 1 Gain s
Page 11 and 12: How’s s that Unfortunately, not u
Page 13 and 14: Source, drain and L1/L2 for 23cm VL
Page 15 and 16: Tune up • Set bias as described i
Page 17 and 18: Improvement in performance - Noise
Page 19 and 20: And • Replacing R3 (51R) with a 3
Page 21 and 22: Noise figure bandwidth Noise figure
Page 23 and 24: 13cm VLNA2 • Improved noise figur
Page 25 and 26: 13cm VLNA2 Position of L1 and L2 fo
Page 27 and 28: 13cm VLNA2 Gain spread 13cm VLNA2 g
Page 29: Thank you! More information @ WWW.G

Getting the most from your G4DDK VLNA - NTMS

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