Rattlegram vs OpLine

COFDMTV is based on COFDM (coded orthogonal frequency-division multiplexing) technology: - 160 ms long OFDM symbols - 6.25 Hz per sub-carrier - 1/8 guard interval - differentially encoded PSK (phase-shift keying) modulation - systematic polar codes for forward error correction Currently Modes 14, 15 and 16 are supported: Using either SPC(2048, 1392), SPC(2048, 1056) or SPC(2048, 712) with CRC32C aided SCL decoding and differential QPSK modulation for the payload. Only a bandwidth of 1600 Hz is needed and the transmission of either 85, 128 or 170 bytes take about one second with the leading noise and fancy header disabled.

OpLine - AllStarLink in Your Pocket Connect to AllStarLink nodes anywhere your iPhone has signal. OpLine is a fast, native iOS client for licensed amateur radio operators who want a clean, reliable way to get on the network without fiddling with desktop tools or generic SIP clients. KEY FEATURES Push to Talk Hold-to-talk or tap-to-toggle. Lock the mic when you need both hands free. Designed to feel like a real radio. Live Net Schedule Browse upcoming nets, filter by region or favorites, and set alerts before they start. Never miss a check-in. Smart Favorites Save your daily-driver nodes and the nets you actually attend. Group them however makes sense to you. Real-Time Telemetry RX/TX activity meters, connection status, and link tracking. See exactly what's happening on the network. Worldwide Coverage Connect to any AllStarLink node, from your local repeater to international hubs. Native iOS Built for iPhone with the polish you'd expect. Dark mode, responsive controls, low latency. REQUIREMENTS - A valid FCC-issued amateur radio license and call sign are required to transmit. - An AllStarLink node connection. Your own ASL3 Raspberry Pi node is recommended — see opline.app/setup for a free build guide. - Standard amateur radio rules apply: identify with your call sign, follow Part 97 (or your country's equivalent). WHY OPLINE Most AllStarLink clients started as desktop tools and got retrofitted for mobile. OpLine was designed iPhone-first: instant connect, sub-second PTT response, clean telemetry, and a UI that respects your time. No subscriptions. No ads. No data collection beyond what's needed to make the app work. Built by a licensed ham who wanted a better way to get on the air from a phone. NEW TO HAM RADIO? Visit opline.app/license for a quick guide to getting your Technician license — the only license you need to use OpLine, and the test is more accessible than you'd think. 73, - OpLine