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CICADAGreenBankSpectrometer2015Feb17
(2015-02-17,
RichardPrestage
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TVEGAS_44 - Continued tests with the simulator
Setup
Setup
Using the new USB-controlled attenuator; range 0 - 30dB attenuation
running procs from /users/rprestag/bankProblem/simulate3
use modified setDigitalGain to control the attenuator
noise source set to 10dB, ampifier, one 10dB pad. Attenuator set to 16dB gives -20dBm ADC power
bof is ver 121. Doesn't seem to be operating as expected. For -20dBm input power:
lbw_gain lbw_gain, filtersnap 2**28 268435456 -25 2**29 536870912 - 19 2**30 1073741824 -13
So, one power of 2 gives 6dB extra power, as expected, but unity gain is not at 2**24. Set to 2**29 for now. Close enough
run USB attenuator from 4 to 30 dB in steps of 2
run checkLinearityBalance
scan 1; attenuator didn't get set... Can't figure out; do it by hand.
start with scan 20...32
stop for the day.
--
RichardPrestage
- 2015-02-17
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Topic revision: r1 - 2015-02-17,
RichardPrestage
CICADA
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