Spectrum Analyzer Results

Methods

To assess the RFI environment over the PAPER receiver's frequency band, we decided to connect a spectrum analyzer to the antenna - balun - receiver setup and take data in chunks of ~1 hour a piece, using the Max Hold function on the spectrum analyzer to determine what parts of the spectrum are most impacted by RFI. Based on these measurements, we should be able to get an idea of where in the spectrum RFI poses the least threat, and create a bandpass filter centered on that less-affected piece of the spectrum.

Spectrum Log

Here is a table containing information and screenshots of the spectrum analyzer for each measurement we performed (the Center Freq. and Bandwidth columns refer to settings on the S.A.):

Date	Time frame	Duration of measurement	Polarization	Center Freq	Bandwidth	Snapshot
6/17/19	11:00 am - 12:21 pm	~81 min	N-S	160 MHz	100 MHz	spectrum1N.JPG
6/17/19	12:27 pm - 1:57 pm	90 min	E-W	160 MHz	100 MHz	spectrum1E.JPG
6/17/19	2:00 pm - 3:00 pm	60 min	N-S	160 MHz	100 MHz	spectrum2N.JPG
6/17/19	3:00 pm - 3:58 pm	58 min	E-W	160 MHz	100 MHz	spectrum2E.JPG
6/17/19	3:59 pm - 4:58pm	59 min	N-S	160 MHz	100 MHz	spectrum3N.JPG
6/18/19	7:56 am - 9:04 am	68 min	N-S	165 MHz	30 MHz	spectrum4N.JPG
6/18/19	9:06 am - 10:01 am	55 min	E-W	165 MHz	30 MHz	spectrum4E.JPG
6/18/19	10:03 am - 11:03 am	60 min	N-S	165 MHz	30 MHz	spectrum5N.JPG
6/18/19	11:05 am - 12:04 pm	59 min	E-W	165 MHz	30 MHz	spectrum5E.JPG
6/18/19	12:07 pm - 1:38 pm	91 min	N-S	165 MHz	30 MHz	spectrum6N.JPG
6/18/19	1:41 pm - 3:24 pm	103 min	E-W	165 MHz	30 MHz	spectrum6E.JPG
6/18/19	3:26 pm - 4:54 pm	88 min	N-S	165 MHz	30 MHz	spectrum7N.JPG
6/19/19	7:15 am - 8:12 am	57 min	N-S	168 MHz	15 MHz	spectrum8N.JPG
6/19/19	8:15 am - 9:13 am	58 min	E-W	168 MHz	15 MHz	spectrum8E.JPG
6/19/19	9:15 am - 10:02 am	47 min	N-S	168 MHz	15 MHz	spectrum9N.JPG
6/19/19	10:05 am - 10:54 am	49 min	E-W	168 MHz	15 MHz	spectrum9E.JPG
6/19/19	10:56 am - 11:58 am	62 min	N-S	168 MHz	15 MHz	spectrum10N.JPG
6/19/19	11:59 am - 1:12 pm	73 min	E-W	168 MHz	15 MHz	spectrum10E.JPG
6/19/19	1:17 pm - 2:22 pm	65 min	N-S	168 MHz	15 MHz	spectrum11N.JPG
6/19/19	2:24 pm - 4:47 pm	143 min	E-W	168 MHz	15 MHz	spectrum11E.JPG

-- EllieWhite - 2019-06-17