We have some new settings for the Comm Handoff, so I repeated the usual measurements:

COMM PLL Servo Board

• Input gain: 27dB
• Common Fitler 1: ON
• Common Filter 2: ON
• VCO Comp: ON
• Low Pass: ON

CM Servo Board

• Input 1 gain: 11dB
• Input 1 pol: POS
• Input 2 gain: 6dB
• Input 2 pol: NEG
• Common Comp: ON
• Fast Gain: 6dB
• Fast pol: POS

LSC-CARM Filter

• Gain: 80
• FM1, FM4, FM5, FM8

LSC-REFL-SERVO-SLOW

• Gain:1
• FM1

MC2_M3_LOCK_L

• Gain: -300
• FM9

MC2_M2_LOCK_L

• Gain: 0.10
• FM3, FM4, FM10

MC2_M1_LOCK_L

• Gain: -1
• FM1, FM2

MC2_M3_ISCINF

• Gain: 1
• Filters OFF

1. Common path OLTF: Handoff_COMM_OLTF_mag/phase.txt
2. Inject into fast path, cf/1-cs OLTF: Handoff_cfast_OLTF_map/phase.txt
3. Inject into slow path, cs/1-cf OLTF: Handoff_cslow_OLTF_mag/phase.txt
4. Crossover using LSC_CARM inputs: /ligo/home/sheila.dwyer/ALS/HIFOX/COMM/Crossover_April1.xml

The UGF of the comm handoff is now 3kHz with 80 deg phase margin. The crossover between the fast and slow path is at 13 Hz with 19 deg phase margin.