Getting the most from your G4DDK VLNA - NTMS
Getting the most from your G4DDK VLNA - NTMS Getting the most from your G4DDK VLNA - NTMS
Curing any unwanted oscillation Note the two pieces of absorber material
Tune up • Set bias as described in the VLNA document • Connect 50 ohm SMA termination to input • Connect output to a spectrum analyser set to cover 100MHz to 2GHz • Reference to 0dBm • Power up the preamp
- 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: Source, drain and L1/L2 for 23cm VL
- 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
Tune up<br />
• Set bias as described in <strong>the</strong> <strong>VLNA</strong><br />
document<br />
• Connect 50 ohm SMA termination to input<br />
• Connect output to a spectrum analyser set<br />
to cover 100MHz to 2GHz<br />
• Reference to 0dBm<br />
• Power up <strong>the</strong> preamp
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