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AdV-COM (AdV commissioning (1st part) )
Paoletti - 11:13 Wednesday 23 May 2018 (41526) Print this report
Comment to 56MHz modulation loss (41500)

A quick check of the RF 56MHz chain does not show any deviation from what expected.

LNFS signal generator is set at +12dBm, RF distribution sends -3dBm to the power amplifier, and the latter has a gain of 33.6dB which provides +30.6dBm (~1W) to the cable that goes at the EOM on the optical bench.

Note that the usual -3dB SMA power attenuator in front of the EOM has been removed since the beginning of the RF power increase.

Note also that the power amplifier for the 56MHz is not the usual (+30dBm ZHL-3A+), because it was modified with a +33dBm ZHL-1-2W+ to allow the power increase within a safety margin.

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