Millimeter Wave Measurements - NTMS
Millimeter Wave Measurements - NTMS Millimeter Wave Measurements - NTMS
W5HN Measurements North Texas NTMS Microwave Society • Sun noise over cold sky • Moon noise over cold sky • Ground to cold sky or • 50Ωto cold sky Tr = Noise temperature of receiver (Kelvin) INV LOG ((dB)/10) = Tr +To Tr + Tant Tr = 290 log (NF-1) where NF is noise factor (ratio) and NOT noise figure (dB) To = temp of 50Ωload (Kelvin) Tant in Kelvin is a measure of how quiet your antenna is on receive which T takes into account feed efficiency and a spillover and atmospheric absorption – n lower the better t WWW.NTMS.ORG 34
W5HN 2.4 m Fiberglass Offset Fed Dish with WR-10 Std Gain Horn NF = 8.5 dB (1763K) North Texas NTMS Microwave Society Sun Noise / cold sky = 1.6 to 1.8 dB w / WR-10 Feedhorn 1.2 dB w / WR-15 Feedhorn 1.2 dB w / small WR-15 Feedhorn 1.0 dB w / W2IMU Feedhorn SFI = 75 Moon Noise / cold sky = 0.15 dB w / WR-10 Horn 50Ω/ cold sky = 0.35 dB w / WR-10 Horn, NF = 8.5 dB, Ta = 131K Theoretical 3 dB BW = .11 degree WWW.NTMS.ORG 35
- Page 1 and 2: W5HN North Texas NTMS Microwave Soc
- Page 3 and 4: W5HN HP 8757 Scalar Analyzer North
- Page 5 and 6: W5HN 40 to 60 GHz Test Setup North
- Page 7 and 8: W5HN 8757 40 to 60 GHz S21 & S11 No
- Page 9 and 10: W5HN W0EOM SMT S90-1240 Amplifier R
- Page 11 and 12: W5HN W5LUA Wiltron 3 dB Attenuator
- Page 13 and 14: W5HN Hughes WR-15 Noise Figure Test
- Page 15 and 16: W5HN WR-15 30 dB Attenuator North T
- Page 17 and 18: W5HN RF Input Level for LNA Tests N
- Page 19 and 20: W5HN WA1MBA LNA#4 North Texas NTMS
- Page 21 and 22: W5HN WA1MBA LNA #6 North Texas NTMS
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- Page 25 and 26: W5HN OE9PMJ 47 GHz BPF Retuned to 7
- Page 27 and 28: W5HN Barry’s New Baby - A 75 to 1
- Page 29 and 30: W5HN WA1MBA 78 GHz LNA#6 with W/G T
- Page 31 and 32: W5HN LNA#5 with Input Tuner - 8/29/
- Page 33: W5HN GR-1216 & GR-1236 IF Amplifier
- Page 37 and 38: W5HN Lessons Learned North Texas NT
- Page 39 and 40: W5HN 50 GHz 2.4mm detector with tra
- Page 41 and 42: W5HN 78 GHz XVTR with new LNA ! Nor
- Page 43 and 44: W5HN To the Moon, Alice! North Texa
- Page 45 and 46: W5HN 1 m Winegard Offset Fed Dish w
- Page 47 and 48: W5HN North Texas NTMS Noise Figure
- Page 49: W5HN North Texas NTMS Microwave Soc
W5HN<br />
<strong>Measurements</strong><br />
North<br />
Texas<br />
<strong>NTMS</strong><br />
Microwave<br />
Society<br />
• Sun noise over cold sky<br />
• Moon noise over cold sky<br />
• Ground to cold sky or<br />
• 50Ωto cold sky<br />
Tr = Noise temperature of receiver (Kelvin)<br />
INV LOG ((dB)/10) =<br />
Tr +To<br />
Tr + Tant<br />
Tr = 290 log (NF-1) where NF is<br />
noise factor (ratio) and NOT noise<br />
figure (dB)<br />
To = temp of 50Ωload (Kelvin)<br />
Tant in Kelvin is a measure of how<br />
quiet your antenna is on receive which<br />
T<br />
takes into account feed efficiency and<br />
a<br />
spillover and atmospheric absorption –<br />
n<br />
lower the better<br />
t<br />
WWW.<strong>NTMS</strong>.ORG 34
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