4. Current NRAO/GBO facility adoption status

This table is a quick summary of the current NRAO/GBO facilities that have started uploading their observation status to the ODS API, and which satellite operators have started utilizing the ODS data for the Telescope Boresight Avoidance (TBA) technique. However, by design, the current NRAO ODS system is already capable of reporting all frequency ranges available to VLA, VLBA (10 stations and High Sensitivity Array), and GBT.

By default, the Data Senders are reporting the nominal frequency range of each designated receiver (as listed for each site below), regardless of whether an observer is using the entire receiver band or not. This ensures the receiver will have full protection from the satellite operators for potential spectral leakage and compression.

Site	Satellite Downlink	Sat. Operators adopted ODS	Effected receiver bands	Current TBA status
VLA	1990-1995 MHz1	SpaceX Starlink	L & S	ACTIVE since Jan 2025
	10.7-12.7 GHz2	SpaceX Starlink	X & Ku	ACTIVE since Aug 2024
VLBA	1990-1995 MHz	SpaceX Starlink	L & S	ACTIVE since Sep 2025
	10.7-12.7 GHz	SpaceX Starlink	U	ACTIVE since Sep 2025
	37.5-42.0 GHz3	AST SpaceMobile	Q	Interim test using Q-band schedule without ODS-TBA
GBT	1990-1995 MHz	SpaceX Starlink	S & UWBR	Under test since Oct 2026
	10.7-12.7 GHz	SpaceX Starlink	X & Holography & Ku	Under test (Oct 2025 - May 2026)

¹ DTC/SCS downlink band by Starlink for T-Mobile. [DTC = Direct to Cell (a.k.a., D2C); SCS = Supplemental Coverage from Space. Both acronym are used interchangeably]

² Starlink’s broaband internet downlink band

³ SpaceMobile’s proposed V-band downlink band

4.1. Observation modes supported by ODS reporting

Facility	Observing mode	Sub mode	Special mode	ODS reporting
VLA	Spectral Line			Covered by main VLA Data Sender feature
	Continuum			Covered by main VLA Data Sender feature
	Polarimetry			Covered by main VLA Data Sender feature
	Subarrays			Covered by VLA Data Sender as subarray = (0, 1, 2)
	Mosaicking and OTF			Covered by VLA Data Sender otf-mosaic feature
	Moving Objects			Covered by VLA Data Sender Non-Sidereal target feature
	Solar Observing			Covered by main VLA Data Sender feature
	VLBI at VLA (HSA)			Covered by VLBA Data Sender as vla site with subarray = 3
	Pulsars			Covered by main VLA Data Sender feature
	Holography	Point & Shoot		Not currently supported
	Holography	On the Fly (OTF)		Not currently supported
	Manual scripts	(many)		Not currently supported (under development as of Fall 2026)
VLBA	Spectral Line		Dual band obs	Covered by main VLBA Data Sender feature
	Continuum		Dual band obs	Covered by main VLBA Data Sender feature
GBT	Spectral Line	Mapping		Covered by main GBT Data Sender, under test
	Continuum	Mapping		Covered by main GBT Data Sender, under test
	Moving Objects	Mapping		Under test
	Radar/ngRadar - transmit			Not currently supported
	Radar/ngRadar - receive			Not currently supported
	VLBI at GBT (HSA)			Covered by VLBA Data Sender as gbt site with subarray = 0
	Pulsars (incl. NANOGrav)			Under test
	Cyclic Spectroscopy (pulsars)			Not currently supported
	Breakthrough Listen			Under test
	Baseband (raw voltages)			Not currently supported
	Manual scripts	(many)		Covered by main GBT Data Sender MRMR4, under test with limited use

⁴ MRMR = Manual RFI Mitigation Request

4.2. site_id description

Facility	site_id	Description	site_lat_deg	site_lon_deg	site_el_m	Notes
VLA	vla_A	A Configuration (Config.)	34.078749	-107.617728	2124	See latest VLA configuration
	vla_A-to-D	Config A -> D transition	_	_	_
	vla_D	D Config	_	_	_
	vla_D-to-C	Config D -> C	_	_	_
	vla_C	C Config	_	_	_
	vla_C-to-B	Config C -> B	_	_	_
	vla_B	B config	_	_	_
	vla_B-to-BnA	Config B -> BnA	_	_	_
	vla_BnA	BnA config reserved exclusively for VLA Sky Survey (VLASS)	_	_	_
	vla_BnA-to-A	Config BnA -> A	_	_	_
VLBA	vlba_SC	St. Croix – U.S. Virgin Islands	17.756578	-64.583631	-15	Adopted from the VLBA site coordinate website
	vlba_HN	Hancock – New Hampshire	42.933608	-71.986581	296
	vlba_NL	North Liberty – Iowa	41.771425	-91.574133	222
	vlba_FD	Fort Davis – Texas	30.635031	-103.944817	1606
	vlba_LA	Los Alamos – New Mexico	35.775125	-106.245597	1962
	vlba_PT	Pie Town – New Mexico	34.301003	-108.119183	2365
	vlba_KP	Kitt Peak – Arizona	31.956306	-111.612422	1902
	vlba_OV	Owens Valley – California	37.231653	-118.277047	1196
	vlba_BR	Brewster – Washington	48.131228	-119.683278	250
	vlba_MK	Mauna Kea – Hawaii	19.801381	-155.455503	3763
GBT	gbt	Green Bank Telescope - WV	38.433129	-79.839839	824	The elevation here is the height of elevation axle w.r.t. ellipsoid

4.3. Frequency ranges reported by ODS for NRAO/GBO facilities

Facility	Receiver Name	freq_lower_hz	freq_upper_hz
VLA	See VLA receiver summary table
VLBA5	P	290000000.0	350000000.0
	610	570000000.0	636000000.0
	L	1060000000.0	1840000000.0
	S	1860000000.0	3100000000.0
	C	3900000000.0	7900000000.0
	X	7660000000.0	9040000000.0
	U	11960000000.0	15940000000.0
	K	20560000000.0	25040000000.0
	Q	41000000000.0	45000000000.0
GBT	See GBT receiver summary table

⁵ The VLBA bands being reported are slightly larger than the nominal bandpass range due to compensating the 3dB roll off at the upper and lower filter band edges.