Locator DX vs PhosphorHertz

Locator DX is the essential tool for amateur radio operators to calculate distances and bearings between Maidenhead grid locators anywhere in the world. KEY FEATURES Distance Calculator Calculate precise distances between any two Maidenhead locators in 4 or 6 character format. Results displayed in both kilometers and miles with accurate great circle calculations. Azimuth and Bearing Get exact azimuth bearing and back azimuth for antenna pointing. Perfect for VHF/UHF operations, satellite tracking, and DX hunting. Interactive World Maps Visualize your connections on beautiful interactive maps with three display modes: - Standard road map - Satellite imagery - Hybrid view with labels See your QTH and DX station marked with custom icons, connected by a path line showing the exact route. GPS Auto-Location Instantly determine your current Maidenhead grid locator using GPS. Perfect for portable operations, Field Day, SOTA activations, and rover contests. Calculation History Automatically saves your last 20 calculations with timestamps. Quickly review past contacts, distances, and bearings. Swipe to delete individual entries or clear all at once. Support for All Locator Formats Works with both 4-character like JO70 and 6-character like JO70ab Maidenhead locators for maximum precision. PERFECT FOR - VHF/UHF operators planning antenna direction - Contest participants logging grid squares - Satellite operators tracking passes - DX hunters finding new contacts - Field Day and portable operations - SOTA and POTA activations - Learning about Maidenhead locator system FEATURES AT A GLANCE Worldwide coverage - calculate any two points on Earth Accurate great circle distance calculations Precise azimuth and back azimuth Real-time GPS location to grid conversion Beautiful interactive maps with satellite view Automatic calculation history Works completely offline except maps Clean, intuitive interface Optimized for both iPhone and iPad Portrait and landscape support No ads, no tracking, no accounts required PRIVACY FOCUSED Your privacy matters. Locator DX: - Never collects or transmits your data - Stores history only on your device - Uses GPS only when you tap the location button - No analytics or tracking - No third-party services Whether you are at home planning your next DX contact, operating portable in the field, or competing in a VHF contest, Locator DX gives you the calculations you need quickly and accurately. 73 de Locator DX

PhosphorHz is a real-time HF radio propagation monitor for amateur radio operators. It pulls live space weather data from NOAA's Space Weather Prediction Center and translates it into band-by-band conditions you can act on — right now, from your location. No guesswork. No stale forecasts. Just the numbers, rendered in a retro CRT phosphor display that would look at home in a Cold War listening post. BAND CONDITIONS See at a glance which HF bands are open, marginal, closed, or blacked out. Conditions are calculated from real-time solar flux, geomagnetic activity, and X-ray flux data — not generic regional forecasts. Each band shows your local status plus path-specific conditions to every DX target you configure. MUF CALCULATION The Maximum Usable Frequency for a 3000km reference path from your QTH, derived from Solar Flux Index, solar zenith angle, and depressed by geomagnetic activity. Individual MUFs are calculated for each great-circle path to your DX targets, because the ionosphere doesn't care about averages. SOLAR INDICES All the numbers that matter, updated in real time: Solar Flux Index (SFI) with 30-day trend chart Planetary Kp Index with 24-hour bar chart Estimated Sunspot Number (SSN) GOES X-ray flux class and latest flare detection Solar wind IMF Bz component NOAA R/S/G scales (Radio Blackout, Solar Radiation, Geomagnetic Storm) Running A-index and solar wind Bt Each index includes a plain-language assessment: is the F2 layer well ionised? Is the geomagnetic field quiet or disturbed? Is the solar wind coupling or shielded? 3D GREYLINE GLOBE A SceneKit globe shows the solar terminator — the boundary between day and night — in real time. The greyline (twilight zone along the terminator) is where lower-band DX propagation is enhanced, and it's rendered as an amber band you can see at a glance. The globe displays coastlines, your QTH position, DX target locations, and great-circle paths coloured by band condition. Drag to rotate. Double-tap to recentre on your station. Hit play to watch the Earth spin. SPACE WEATHER ALERTS NOAA SWPC alerts and warnings filtered for HF relevance. Flare events, geomagnetic storms, radio blackouts — the alerts that actually affect your ability to make contacts, with full detail on tap. DX TARGETS Configure up to five target regions. PhosphorHz calculates path-specific propagation for each one, using great-circle geometry and the MUF at the midpoint of each path. What's open to Japan might be closed to South America — and now you can see both at once. FEATURES Real-time data from NOAA SWPC (public domain, no API key required) Band conditions for 160m through 6m Path-specific propagation to multiple DX targets 3D interactive greyline globe with terminator visualisation Sunrise/sunset times and countdown to next solar event Day/night/greyline status at your QTH Kp index 24-hour bar chart SFI 30-day trend line Full space weather alert log with 30-day history Maidenhead grid locator display Automatic location detection or manual grid entry Green phosphor and amber phosphor CRT themes CRT scanline overlay effect Designed for iPhone, portrait orientation No ads. No tracking. No subscription. Part of the Phosphor suite: PhosphorWX (aviation weather), PhosphorRad (radiation monitoring), PhosphorSol (space weather), and PhosphorOrbit (satellite tracking). 73 de PhosphorHz.