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Coordinator needs to publish CHAN_BW #4

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david-macmahon opened this issue Nov 4, 2019 · 2 comments
Open

Coordinator needs to publish CHAN_BW #4

david-macmahon opened this issue Nov 4, 2019 · 2 comments
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@danielczech
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@david-macmahon
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The coordinator needs to publish CHAN_BW to the processing nodes. CHAN_BW is the bandwidth of a single F engine frequency channel (aka "coarse channel"). If the spectrum is inverted in frequency (e.g. by sampling the second Nyquist zone or by an odd number of lower sideband mixes), then CHAN_BW is negative.

The following is always true:

F(chan N+1) = F(chan N) + CHAN_BW
@david-macmahon
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The absolute value of CHAN_BW is ADC_SAMPLE_RATE / 2 / FENCHAN, but the sign is dependent on the IF tuning and ADC sampling regime.

@david-macmahon david-macmahon mentioned this issue Nov 5, 2019
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@danielczech
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Published (c69ff20) but without the sign for the moment (finding out if relevant sensors are available).

@david-macmahon david-macmahon added the metadata This involves metadata label May 25, 2020
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