Crowdsorsa vs PhosphorCalc

Crowdsorsa is a mobile game for crowdsourcing data collection and microtasks to improve the city environment. Players can earn money and compete against each other by participating in our fun and meaningful missions. The game is played by collecting or placing virtual objects on the map while taking photos or videos with your smartphone. Each object grows your earnings which you can request to be paid to your bank account whenever you want. Missions are organized only at certain times and in specific locations, to serve our clients’ needs and requirements. Players can, for example, photograph benches, bus stops and manhole covers, record videos of roads and cycling routes, or search and destroy invasive plants in their area. You will be instructed to each mission in the Crowdsorsa app. Following these instructions is very important to ensure that your photos and videos can be approved and rewarded to you. In case you need any help, you can easily contact us through the app. To create a Crowdsorsa user account and participate in the game, you need to be at least 18 years old or 13–17 years old with parental consent.

RF and antenna calculator for amateur radio operators. Ten standalone calculators on a clean, fast interface. Numbers in, numbers out. No network, no accounts, no subscriptions. DIPOLE Calculate half-wave dipole, quarter-wave vertical, and full-wave loop antenna lengths for any frequency. Adjustable velocity factor for different wire types. Results in both metres and feet. WAVELENGTH Bidirectional frequency and wavelength conversion. Enter either value and the other is derived instantly. Identifies standard amateur band allocations (ITU Region 1) automatically. PATH LOSS Free space path loss calculator with approximate S-meter reading context. Supports kilometres and miles. Result can be imported directly into the Link Budget calculator. COAX LOSS Feedline attenuation for seven common cable types: RG-58, RG-8X, RG-213, LMR-240, LMR-400, Aircell 7, and Ecoflex 15. Uses log-linear interpolated manufacturer data across frequency. Shows power delivered to antenna from a 100W transmitter. Result can be imported into the ERP calculator. ERP / EIRP Effective radiated power accounting for transmitter output, feedline loss, and antenna gain. Supports both dBi and dBd gain input. Shows feed power, EIRP, and ERP in watts and dBW. SWR Standing wave ratio from forward and reflected power readings, or direct SWR entry. Calculates return loss, mismatch loss, reflection coefficient, and power delivered. Colour-coded SWR indicator: green for good, amber for marginal, red for poor. POWER Ohm's law solver: pick any two of voltage, current, resistance, and power — the other two are calculated. Separate dB conversion section converts between watts, milliwatts, dBm, and dBW. LINK BUDGET Complete end-to-end signal path analysis. Enter TX power, feedline losses, antenna gains, and path loss to see received signal power in dBm and microvolts, S-meter estimate, and link margin above noise floor. Selectable receiver bandwidth: CW, SSB, FM, or Digital. LC RESONANCE LC tank circuit calculator. Solve for resonant frequency, inductance, or capacitance given the other two values. Displays inductive and capacitive reactance at resonance as a cross-check. IMPEDANCE L-network impedance matching calculator. Given source and load impedance at a target frequency, calculates component values for both low-pass and high-pass matching network topologies. Shows Q factor and network orientation. FEATURES All calculations update live as you type Tap any result to copy it to the clipboard Cross-tab import: pull coax loss into ERP, path loss into link budget Every calculator includes built-in reference notes explaining the formulae Clear and reset controls on every tab Decimal keypad input throughout No internet connection required — everything runs locally No tracking, no analytics, no data collection Part of the Phosphor radio suite alongside PhosphorRTTY, PhosphorCW, PhosphorHertz, and PhosphorSol.