daniel.sigg@LIGO.ORG - posted 18:00, Friday 04 May 2018 (41852)
EOM Drivers moved outside PSL enclosure
Fil Peter Rick Jason Daniel
We moved the EOM drivers from under the PSL table to the bottom of the PSL-R2 rack. The setup itself is still the same until we get the RF combiner/amplifier. Before connecting back to the EOM, we remeasured the RF power using the same settings of 23.4 dBm and 27.0 dBm for 9 and 45 MHz, respectively. As a comparison, we also give the numbers from Koji's alog 41435.
| Frequency | old alog 41435 | @rack PSL-R2 | @ EOM | Cable loss | Difference |
| 9.1 MHz | 23.56 dBm | 23.49 dBm | 23.33 dBm | 0.16 dB | –0.07 dB |
| 24.07 MHz | 24.60 dBm | 25.33 dBm | 24.90 dBm | 0.43 dB | +0.30 dB |
| 45.5 MHz | 23.76 dBm | 23.84 dBm | 23.48 dBm | 0.36 dB | –0.28 dB |
| 118 MHz | 9.84 dBm | 10.22 dBm | 9.66 dBm | 0.56 dB | –0.18 dB |
The cable loss for the 24 MHz signal seems a little high and might be due to an imperfect VSWR. Otherwise, the RF levels are close, but the RF phases will have changed.
More details in T1800196.