Update for 28-01-22 16:45
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@ -72,6 +72,10 @@ Example: what is the power change from 5W to 10W, in dB?
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10 log (10 / 5) = 10 (0.3010) = 3dB
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*dBi* means gain with respect to an isotropic antenna.
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*dBd* means gain with respect to a dipole antenna
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== Antenna Types ==
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=== Dipole ===
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5
tech/EME.wiki
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5
tech/EME.wiki
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@ -0,0 +1,5 @@
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= EME =
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Earth-moon-earth or EME is a type of propigation where signals are bounced off
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of the moon and sent back to earth, in order to increase the range of VHF and
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UHF communications.
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@ -45,6 +45,7 @@ see [[electronics]]
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[[Propagation]]
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[[Antenna]]
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[[SWR]]
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[[EME]]
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== [[Modulation]] ==
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@ -3,15 +3,21 @@
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Q codes are shorthands for common phrases in radio communication. Below is a
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table of Q codes that I need to memorize.
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| Code | Meaning |
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| CQ | Looking for contact |
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| QRRR | Distress signal |
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| QSO | Make contact |
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| QRL | Is this freq busy? |
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| QRO | Increase power (?) |
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| QRP | Decrease power (?) |
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| QRZ | Who is calling? |
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| QST | Calling all Amatuers |
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| Code | Meaning |
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| CQ | Looking for contact |
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| QRRR | Distress signal |
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| QSO | Make contact |
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| QRL | Is this freq busy? |
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| QRO | Increase power (?) |
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| QRP | Decrease power (?) |
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| QRZ | Who is calling? |
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| QST | Calling all Amatuers |
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Terms
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------
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| Code | Meaning |
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| QRM | Human made interference |
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| QRN | Atmospheric noise |
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| QSB | Signal fading (variation is strength over time) |
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