A step attenuator with the 1dB/step variations.
I am tentatively using the conversion function:
def s_meter2db(s_meter): # S0=000, S9=120, S9+60dB=240; S9=-73dBm if s_meter < 120: s_meter_db = 0.2 * (s_meter - 120.0) - 73.0 else: s_meter_db = 0.5 * (s_meter - 120.0) - 73.0 return s_meter_db
6 / 11 : Change settings and Hit return to continue.. irep = 5 freq[kHz] = 6000.0 170 -48.0 [dBm] freq[kHz] = 6200.0 170 -48.0 [dBm] freq[kHz] = 6400.0 170 -48.0 [dBm] freq[kHz] = 6600.0 170 -48.0 [dBm] freq[kHz] = 6800.0 170 -48.0 [dBm] freq[kHz] = 7000.0 170 -48.0 [dBm] freq[kHz] = 7200.0 170 -48.0 [dBm] freq[kHz] = 7400.0 170 -48.0 [dBm] freq[kHz] = 7600.0 170 -48.0 [dBm] freq[kHz] = 7800.0 170 -48.0 [dBm] 7 / 11 : Change settings and Hit return to continue.. irep = 6 freq[kHz] = 6000.0 168 -49.0 [dBm] freq[kHz] = 6200.0 168 -49.0 [dBm] freq[kHz] = 6400.0 168 -49.0 [dBm] freq[kHz] = 6600.0 168 -49.0 [dBm] freq[kHz] = 6800.0 168 -49.0 [dBm] freq[kHz] = 7000.0 168 -49.0 [dBm] freq[kHz] = 7200.0 168 -49.0 [dBm] freq[kHz] = 7400.0 168 -49.0 [dBm] freq[kHz] = 7600.0 168 -49.0 [dBm] freq[kHz] = 7800.0 168 -49.0 [dBm] 8 / 11 : Change settings and Hit return to continue.. irep = 7 freq[kHz] = 6000.0 166 -50.0 [dBm] freq[kHz] = 6200.0 166 -50.0 [dBm] freq[kHz] = 6400.0 166 -50.0 [dBm] freq[kHz] = 6600.0 166 -50.0 [dBm] freq[kHz] = 6800.0 166 -50.0 [dBm] freq[kHz] = 7000.0 166 -50.0 [dBm] freq[kHz] = 7200.0 166 -50.0 [dBm] freq[kHz] = 7400.0 166 -50.0 [dBm] freq[kHz] = 7600.0 166 -50.0 [dBm] freq[kHz] = 7800.0 165 -50.5 [dBm]
This is with the step size of 5dB.