Getting the most from your G4DDK VLNA - NTMS
Getting the most from your G4DDK VLNA - NTMS Getting the most from your G4DDK VLNA - NTMS
Tuning without a noise figure meter 1296MHz
Improvement in performance – Noise figure Noise figure spread Noise figure (dB) 0.3 0.25 0.2 0.15 0.1 0.05 VLNA1 3 different preamps MGF4919 MGF4919 MGF4919 MGF4919 +10R MGF4919 +0R 0 1 2 3 4 5 6 Unit 1 is the reference ‘golden’ unit with NE32584C 2, 3 and 4 modified with MGF4919 and 22R drain resistor 5 as 4 but drain resistor = 10R 6 as 4 but drain resistor = 0R
- 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: Tune up • Set bias as described i
- 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
Improvement in performance –<br />
Noise figure<br />
Noise figure spread<br />
Noise figure (dB)<br />
0.3<br />
0.25<br />
0.2<br />
0.15<br />
0.1<br />
0.05<br />
<strong>VLNA</strong>1<br />
3 different preamps<br />
MGF4919 MGF4919 MGF4919<br />
MGF4919<br />
+10R<br />
MGF4919<br />
+0R<br />
0<br />
1 2 3 4 5 6<br />
Unit<br />
1 is <strong>the</strong> reference ‘golden’ unit with NE32584C<br />
2, 3 and 4 modified with MGF4919 and 22R drain resistor<br />
5 as 4 but drain resistor = 10R<br />
6 as 4 but drain resistor = 0R
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