Yesterday, 2026-08-27, the IRIG-B signal was disabled in the 100MHz-IRIG-B timing distribution to check the phase noise:

• 2026-08-26-07h28m08-UTC       Command '100MHz-IRIGB:irig off' executed
• 2026-08-26-07h45m09-UTC       Command '100MHz-IRIGB:irig on' executed

Looking at the LNFS and EOM 6MHz, 8MHz and 56MHz signals, I was surprised by the shape of their FFT's phase 

• This plot compares them when the IRIG-B distrubution is disabled for  the 2026-02-10-18H00m-UTC (purple) and the  2026-08-26-07h30m-UTC (blue)
• This plot compares them when the IRIG-B distribution is enabled for the  2026-07-10-00h00m_UTC (puple) and the  2026-07-16-00h00m-UTC (blue), after the replacement of the LNFS generator by a spare

According to these plots, the spare LNFS seems to be more noisy and with more lines