Getting the most from your G4DDK VLNA - NTMS
Getting the most from your G4DDK VLNA - NTMS Getting the most from your G4DDK VLNA - NTMS
13cm VLNA2 • MGF4919 front end – Same length source leads as the 23cm VLNA2 • C1, L1 and L2 as 13cm VLNA1 • T2 absorber strip not required, although T3 is required • L9 changed to 5.6nH
13cm VLNA2 Position of L1 and L2 for lowest noise figure Absorber tile Too large!
- 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 and 8: Gain results for 23cm VLNA 1 Gain s
- Page 9 and 10: Initial attempts to improve perform
- 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: 13cm VLNA2 • Improved noise figur
- Page 27 and 28: 13cm VLNA2 Gain spread 13cm VLNA2 g
- Page 29: Thank you! More information @ WWW.G
13cm <strong>VLNA</strong>2<br />
• MGF4919 front end<br />
– Same length source leads as <strong>the</strong> 23cm <strong>VLNA</strong>2<br />
• C1, L1 and L2 as 13cm <strong>VLNA</strong>1<br />
• T2 absorber strip not required, although<br />
T3 is required<br />
• L9 changed to 5.6nH
Change language