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| Antenna Length: | |
| 1/4th length [in m] = 74948114.5 / f [frequency in Hz] | |
| 1/4th length [in cm] = 7494.81145 / f [frequency in MHz] | |
| Radio Frequency Spectrum Ranges: | |
| VLF: 3kHz-30kHz 100Km-10Km | |
| LF: 30kHz-300kHz 10Km-1Km | |
| MF: 300kHz-3MHz 1Km-100m | |
| HF: 3MHz-30MHz 100m-10m | |
| VHF: 30MHz-300MHz 10m-1m | |
| UHF: 300MHz-3GHz 1m-10cm L (1-2GHz), S (2-4GHz) band | |
| SHF: 3GHz-30GHz 10cm-1cm S (2-4GHz), C (4-8GHz), X (8-12GHz), Ku (12-18GHz), | |
| K (18-27GHz), Ka (27-40GHz) bands | |
| EHF: 30GHz-300GHz 1cm-1mm Ka (27-40GHz), V (40-75GHz), W (75-110GHz), | |
| mm (110-300GHz) bands | |
| * Microwave: 1GHz+ | |
| * Millimeterwave: 30GHz+ | |
| * Long Wave: 148.5-283.5kHz? | |
| * Medium Wave: 525kHz-1,705kHz (10kHz spacing) | |
| * Short Wave: 1.6-30MHz | |
| * FM: 88MHz-108MHz | |
| Usage: | |
| • ADS-B (Automatic Dependent Surveillance - Broadcast) | |
| 1,090MHz | |
| 978Mhz (for aircraft exclusively below 18,000'/5,486m in USA) | |
| • AIS (Automatic Identification System): 161.975MHz & 162.025MHz | |
| • CB radio: around 27MHz | |
| • IRNSS/NavIC: L5 (1,176.45MHz) and S band (2,492.028MHz) | |
| • GPS: L1 (1,575.42MHz), L2 (1,227.60MHz) | |
| • GLONASS: L1 (1,602+[9/16]MHz), L2 (1,246+[7/16]MHz) | |
| • HAM/amateur band: 144-14MHz Narrow FM | |
| • Marine emergency communication: 2,182kHz | |
| • VHF universal use: | |
| 50-54MHz: Amateur Radio 6m band | |
| 108-1,18MHz: Air navigation beacons VOR and Instrument Landing System | |
| localizer | |
| 118-1,37MHz: ATC (AM), 121.5MHz is emergency frequency (HF/UHF) | |
| 144-1,48MHz: Amateur Radio 2m band. | |
| • Weather Satellites | |
| Meteor M1: EOL | |
| Meteor M2: 137.9MHz | |
| NOAA 15: 137.62MHz | |
| NOAA 18: 137.9125MHz | |
| NOAA 19: 137.1MHz | |
| Convert dBi to dBd | |
| Subtract 2.15 from dBi rating to get equivalent dBd rating. | |
| * 'i' means it is a measurement relative to an isotropic antenna and 'd' | |
| means it is a measurement relative to a dipole antenna. Dipoles have a 2.15dB | |
| gain compared to an isotropic antenna. | |
| Devices: | |
| • Elonics E4000: | |
| 52-2200MHz (gap approx 1100-1250MHz) | |
| Approx 50MHz-2.3GHz (possible when used out-of-spec, with gap) | |
| • NooElec NESDR SMArt | |
| RTL2832U interface IC | |
| R820T2 tuner IC | |
| 0.5PPM TCXO | |
| 25MHz-1750MHz | |
| 2.4MHz bandwidth | |
| Female SMA | |
| • RTL-SDR Blog v3 | |
| RTL2832U interface IC | |
| R820T2 tuner IC | |
| 1PPM TCXO | |
| Bias-tee | |
| 500kHz-1,766MHz (500kHz-24MHz in direct sampling mode) | |
| 2.4MHz bandwidth | |
| Female SMA |
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