Fig. 6: Time-averaged power and phase spectra of PCAL tones. | Light: Science & Applications

Fig. 6: Time-averaged power and phase spectra of PCAL tones.

From: Optical frequency comb integration in radio telescopes: advancing signal generation and phase calibration

Fig. 6: Time-averaged power and phase spectra of PCAL tones.

a Power spectrum of PCAL tones observed with the KVN Yonsei (KY) radio telescope. Thirteen distinct tones are clearly identified within a 512 MHz bandwidth centred at 21.806 GHz in RHCP. The tones are evenly spaced at 40 MHz intervals. b Phase spectrum of PCAL tones. c Unwrapped phase spectrum after removing 2π ambiguity. Linear fits are applied to both the full tones and a subset excluding 21,760 MHz tone, with the corresponding RMS residuals of group delay indicated. All spectra are averaged over a duration of 2 minutes

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