开云体育

and pushed to SF git repository branch pu/df

commit ea4702e33b5828edcb5c6b515cc4ef6b1e88a17e
Author: dave-w1hkj <w1hkj@...>
Date:   Fri Apr 16 18:22:27 2021 -0500

    Add OFDM modes for NBEMS
     * OFDM-500F for HF SSB
       - survives HF NVIS/long path
       - 4-carriers of 62.5-baud 4PSK = 250 bps
       - 1/2 rate K=15 FEC with 4sec interleaver
     * OFDM-750F for HF SSB
       - survives HF NVIS/long path
       - 3-carriers of 125-baud 8PSK = 562 bps
       - 1/2 rate K=13 FEC with 3.2sec interleaver
     * OFDM-2000F for HF-SSB/FM
       - 8 carriers of 125-baud 8PSK = 2000bps
       - 2/3 rate K=13 FEC with 3.2sec interleaver
     * OFDM-2000 for HF-SSB/FM
       - 4 carriers of 250-baud 8PSK = 3000bps
       - NO FEC, meant for line-of-sight
     * OFDM-3500 for FM 9600-port
       - 7 carriers of 250-baud 8PSK = 5250bps
       - NO FEC, meant for line-of-sight
       - Requires Signalink made-after 2018 connected to the 9600-jack
     * OFDM-2000F CPU-load fix
       - FEC of previous mode too heavy for some CPUs
         . Reduced to: K=11 FEC with 1600msec interleaver
         . Other mode parameters unchanged
     * Added Vestigial-carrier based AFC to OFDM modes
       - Increases robustness and tolerance to drift
      * OFDM 2000F hold
       - commented out OFDM 2000 and 2000F modes for bugfixes
       - OFDM 500F, 750F, and 3500 are complete

commit c38d1c153b4cb5d25110258897958f39630cb159
Author: dave-w1hkj <w1hkj@...>
Date:   Thu Jun 24 08:00:32 2021 -0500

    Version 4.1.19

73, David, W1HKJ