HamSphere 5.0 对比 Rattlegram 的使用情况和统计数据

This handheld Amateur Radio transceiver offers 10-160m virtual HamSphere HF bands including 6m, 2m and 70cm. It comes with a fully working 30 day trial. The transceiver has three built in audio filters, USB, LSB and CW Modes, power setting. The transceiver can be expanded with a number of useful instruments as in-app-purchases.

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Rattlegram

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.