Spectra of OVRO-LWA signals at correlator: predicted vs. observed
- Creators
- D'Addario, L.
Abstract
The variation with frequency of the power spectral density (PSD) of OVRO-LWA signals is significantly different than expected within the 25-85 MHz observing band, both for the core antennas (coax-connected) and the expansion antennas (fiber-connected). We observe that the peak of the spectrum is at 33 MHz and the minimum is at 85 MHz; this much is as expected. At the antenna (front end output), the ratio of PSDs at these frequencies is predicted to be 8.1 dB. At the correlator, it should be the same for fiber-connected antennas, and it should be 9.6 to 18.2 dB for coax-connected antennas, depending on cable length. We actually observe a much steeper dropoff. The range is 11.1 to 17.7 dB for fiber-connected antennas (median 14.7 dB) and 11.4 to 20.7 dB for coax-connected antennas (median 18.6 dB).
Attached Files
Accepted Version - memo5.pdf
Files
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Additional details
- Eprint ID
- 119231
- Resolver ID
- CaltechAUTHORS:20230213-225911200
- Created
-
2023-02-13Created from EPrint's datestamp field
- Updated
-
2023-10-09Created from EPrint's last_modified field
- Caltech groups
- Owens Valley Radio Observatory, Owens Valley Radio Observatory. OVRO-LWA Memos
- Series Name
- OVRO-LWA Memo
- Series Volume or Issue Number
- 5