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
GBT	1990-1995 MHz	SpaceX Starlink	S & UWBR	Under development
_	10.7-12.7 GHz	SpaceX Starlink	X & Holography & Ku	Under test since Oct 2025

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 supported currently
	Holography	On the Fly (OTF)		Not supported currently
	Manual scripts	(many)		Not supported currently (under development as of Spring 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 for X-band
	Continuum	Mapping		Covered by main GBT Data Sender, under test for X-band
	Moving Objects	Mapping		Under test for X-band
	Radar/ngRadar - transmit			Not supported currently
	Radar/ngRadar - receive			Not supported currently
	VLBI at GBT (HSA)			Covered by VLBA Data Sender as gbt site with subarray = 0
	Pulsars			Not supported currently
	Cyclic Spectroscopy (pulsars)			Not supported currently
	Breakthrough Listen			Not supported currently
	Baseband (raw voltages)			Not supported currently
	Manual scripts	(many)		Covered by main GBT Data Sender MRMR6

⁴ MRMR = Manual RFI Mitigation Request

4.2. site_id description

Facility	site_id	description
VLA	vla_A	A Configuration (Config.)4
	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
	vlba_HN	Hancock – New Hampshire
	vlba_NL	North Liberty – Iowa
	vlba_FD	Fort Davis – Texas
	vlba_LA	Los Alamos – New Mexico
	vlba_PT	Pie Town – New Mexico
	vlba_KP	Kitt Peak – Arizona
	vlba_OV	Owens Valley – California
	vlba_BR	Brewster – Washington
	vlba_MK	Mauna Kea – Hawaii
GBT	gbt	Green Bank Telescope - WV

⁵ For all VLA configuration schedule, see https://public.nrao.edu/vla-configurations/

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

⁶ 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.