Amateur-Radio-DVB-T2-on-70-cm-445.5-MHz/params.yaml at main · Derek000/Amateur-Radio-DVB-T2-on-70-cm-445.5-MHz · GitHub

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# DVB-T2 on 70 cm — 445.5 MHz / 7 MHz channel
# For GNU Radio gr-dvbt2 with LimeSDR or PlutoSDR
#
# NOTE: sample_rate must be ≥ channel_bandwidth_hz × 1.1 (Nyquist + headroom).
# For 7 MHz BW the minimum is ~7.7 Msps; 8 Msps is recommended.

rf_frequency_hz: 445500000        # 445.5 MHz — 70 cm amateur ATV
channel_bandwidth_hz: 7000000     # 7 MHz channel (valid DVB-T2 BW)
constellation: QPSK               # QPSK / 16QAM / 64QAM / 256QAM
code_rate: "1/2"                  # 1/2, 3/5, 2/3, 3/4, 4/5, 5/6
fft_size: 8192                    # 1k/2k/4k/8k/16k/32k
guard_interval: "1/32"            # 1/4, 19/128, 1/8, 19/256, 1/16, 1/32, 1/128
pilot_pattern: PP7                # PP1–PP8 (PP7 suits 8k/GI 1/32)
plp_count: 1                      # Number of PLPs (1 for simplex ATV)
ldpc_bch: true

device:
  tx:
    type: lime_or_pluto           # set in GRC — disable the unused sink block
    sample_rate: 8000000          # 8 Msps — sufficient for 7 MHz channel
    gain_db: -6                   # back-off to keep shoulders ≤ −40 dBc
    rf_bw_hz: 7500000             # RF filter BW ≈ 7.5 MHz
  rx:
    type: lime_or_pluto
    sample_rate: 8000000          # 8 Msps
    gain_db: 35
    rf_bw_hz: 7500000

udp_ts_in:
  host: 127.0.0.1
  port: 5004

udp_ts_out:
  host: 127.0.0.1
  port: 5006