Rattlegram vs Wave73

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.

Wave73 is designed for amateur radio operators who want to connect beyond the airwaves. Instead of guessing who might be nearby, Wave73 lets you check in at a location and instantly see other hams around you. With Wave73 you can: • Check in and become visible to nearby operators • See who is currently at the same location • Call CQ to signal you’re available • Send a Wave with an optional note to coordinate a quick meet Whether you’re at a hamfest, a coffee shop, an airport, or traveling, Wave73 helps you turn proximity into real connections. Simple. Immediate. Built for hams.