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ITU Operational Bulletin

List VIII - List of International Monitoring Stations · No. 1314

List VIII - List of International Monitoring Stations

Amended in No. 1314 — 15.IV.2025

ADD1314-001Addition
namecentralizing office
Subdirección General de Inspección de las Telecomunicaciones e Infraestructuras Digitales Secretaria General de Telecomunicaciones y Ordenación de los Servicios de Comunicación AudiovisualSubdirección General de Inspección de las Telecomunicaciones e Infraestructuras Digitales Secretaria General de Telecomunicaciones y Ordenación de los Servicios de Comunicación Audiovisual, C/ Poeta Joan Maragall 41 Planta 9.ª 28071 Madrid Spain, PHONE: +34 91 3462605 TELEFAX: +34 91 3461567 EMAIL: cter@economia.gob.es
MODP 1Modification

P 1 MOD by alphabetical order

namepostal addresscontactmeasurement typecoordinateshours of servicefrequency rangesremarkscentralizing office
El Casar (IMS)
El Casar (IMS)Cno. Ribatejada, s/n 19170 El Casar (Guadalajara) SpainPHONE: +34 91 3462553 PHONE: +34 91 3462617 EMAIL: SPascual@economia.gob.es EMAIL: zaida.sierra@economia.gob.esFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys40°41'40"N 003°25'00"W 40°41'40"N 003°25'00"W 40°41'40"N 003°25'00"W 40°41'40"N 003°25'00"W 40°41'40"N 003°25'00"WHX HX HX HX HX10 kHz - 30 MHz 10 kHz - 30 MHz 1 MHz - 30 MHz 10 kHz - 30 MHz 10 kHz - 30 MHzGPS-referenced frequency pattern. Circular network of 9 double-square elements. Interferometric system.
La Esperanza (IMS)
La Esperanza (IMS)C/ La Marina, 20-5° 38071 Tenerife SpainPHONE: +34 91 3462553 PHONE: +34 91 3462617 EMAIL: SPascual@economia.gob.es EMAIL: zaida.sierra@economia.gob.esFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys28°27'23"N 016°22'45"W 28°27'23"N 016°22'45"W 28°27'23"N 016°22'45"W 28°27'23"N 016°22'45"W 28°27'23"N 016°22'45"WHX HX HX HX HX10 kHz - 30 MHz 10 kHz - 30 MHz 1 MHz - 30 MHz 10 kHz - 30 MHz 10 kHz - 30 MHzGPS-referenced frequency pattern. Circular network of 9 double-square elements. Interferometric system.National Telecommunication Regulatory Authority, B4 Smart Village Km 28 Alex - Cairo Desert Road P.O. Box 40 Giza, PHONE: +202 35344666 TELEFAX: +202 35344155 EMAIL: melbashary@tra.gov.eg
Giza
GizaB4 Smart Village Km 28 Alex - Cairo Desert Road P.O. Box 40 Giza EgyptPHONE: +202 35344630 TELEFAX: +202 35344155 EMAIL: welkhalafawy@tra.gov.egFrequency measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys30°01'20"N 031°12'33"E 30°01'20"N 031°12'33"E 30°01'20"N 031°12'33"E 30°01'20"N 031°12'33"EH24 H24 H24 H2410 kHz - 30 MHz 10 kHz - 30 MHz 10 kHz - 30 MHz 10 kHz - 30 MHzAdcock.National Authority for Management and Regulation in Communications of Romania - ANCOM Executive Directorate for Monitoring and Control, 2, Delea Noua Street 030925 Bucharest 3 Romania, PHONE: +40 372 845400 TELEFAX: +40 372 845402 EMAIL: ancom@ancom.ro
SMG Constanta (IMS)
SMG Constanta (IMS)Remote Monitoring Station Cumpana RomaniaPHONE: +40 372 845318 PHONE: +40 372 845508 EMAIL: iulian.mihalcea@ancom.ro EMAIL: liviu.birsan@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys44°08'01"N 028°36'25"E 44°08'01"N 028°36'25"E 44°08'01"N 028°36'25"E 44°08'01"N 028°36'25"E 44°08'01"N 028°36'25"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-113020 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 kHz - 6 GHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 57 m. Remotely controlled monitoring station. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 8-element circular antenna array for reception and direction finding of vertically polarized waves in the frequency range 1300 MHz to 6000 MHz. If necessary, measurements are carried out by mobile monitoring stations (van), on request, all over Romanian territory. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 9-element circular antenna array with quadrature multiplexer for signal processing with a single receiver in the frequency range 20 MHz to 1300 MHz (horizontal and vertical polarization). Correlative. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request. On request. All days of week. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request.
HF Belciugatele (IMS)
HF Belciugatele (IMS)Remote Monitoring Station Calarasi Region RomaniaPHONE: +40 372 845020 PHONE: +40 372 845508 EMAIL: andrei.zancu@ancom.ro EMAIL: iulian.mihalcea@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys44°28'39"N 026°24'16"E 44°28'39"N 026°24'16"E 44°28'39"N 026°24'16"E 44°28'39"N 026°24'16"E 44°28'39"N 026°24'16"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 H249 kHz - 30 MHz 9 kHz - 30 MHz 2 MHz - 30 MHz 9 kHz - 30 MHz 9 kHz - 30 MHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 12 m. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 9-element DF antenna array with HF DF Switch / signal processing with a single receiver with two channels in the tuner (one is used for sample channel and one for the reference channel) in the frequency range 2 MHz to 30 MHz (vertical polarization). Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). An electronic result (.txt/.pdf for bandwidth measurements) is available upon request. On request. All days of week. An electronic result (.txt/.pdf for field strengths/percentage of occupancy) is available upon request.
SMG Craiova (IMS)
SMG Craiova (IMS)Remote Monitoring Station Carligei RomaniaPHONE: +40 372 845318 PHONE: +40 372 845508 EMAIL: iulian.mihalcea@ancom.ro EMAIL: liviu.birsan@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys44°17'05"N 023°44'58"E 44°17'05"N 023°44'58"E 44°17'05"N 023°44'58"E 44°17'05"N 023°44'58"E 44°17'05"N 023°44'58"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 H2420 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 kHz - 6 GHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 27 m. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 8-element circular antenna array for reception and direction finding of vertically polarized waves in the frequency range 1300 MHz to 6000 MHz. If necessary, measurements are carried out by mobile monitoring stations (van), on request, all over Romanian territory. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 9-element circular antenna array with quadrature multiplexer for signal processing with a single receiver in the frequency range 20 MHz to 1300 MHz (horizontal and vertical polarization). Correlative. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request. On request. All days of week. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request.
SMG Galati (IMS)
SMG Galati (IMS)Remote Monitoring Station Odaia Conachi RomaniaPHONE: +40 372 845318 PHONE: +40 372 845508 EMAIL: iulian.mihalcea@ancom.ro EMAIL: liviu.birsan@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys45°33'15"N 027°59'05"E 45°33'15"N 027°59'05"E 45°33'15"N 027°59'05"E 45°33'15"N 027°59'05"E 45°33'15"N 027°59'05"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 H2420 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 kHz - 6 GHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 37 m. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 8-element circular antenna array for reception and direction finding of vertically polarized waves in the frequency range 1300 MHz to 6000 MHz. If necessary, measurements are carried out by mobile monitoring stations (van), on request, all over Romanian territory. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 9-element circular antenna array with quadrature multiplexer for signal processing with a single receiver in the frequency range 20 MHz to 1300 MHz (horizontal and vertical polarization). Correlative. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request. On request. All days of week. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request.
SMG Ghencea (IMS)
SMG Ghencea (IMS)Remote Monitoring Station Bragadiru RomaniaPHONE: +40 372 845318 PHONE: +40 372 845508 EMAIL: iulian.mihalcea@ancom.ro EMAIL: liviu.birsan@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys44°24'04"N 025°59'50"E 44°24'04"N 025°59'50"E 44°24'04"N 025°59'50"E 44°24'04"N 025°59'50"E 44°24'04"N 025°59'50"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 H2420 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 kHz - 6 GHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 57 m. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 8-element circular antenna array for reception and direction finding of vertically polarized waves in the frequency range 1300 MHz to 6000 MHz. If necessary, measurements are carried out by mobile monitoring stations (van), on request, all over Romanian territory. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Correlative. 9-element circular antenna array in the frequency range 20 MHz to 1300 MHz (horizontal and vertical polarization). Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request. On request. All days of week. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request.
SMG Oradea (IMS)
SMG Oradea (IMS)Remote Monitoring Station Cordau RomaniaPHONE: +40 372 845318 PHONE: +40 372 845508 EMAIL: iulian.mihalcea@ancom.ro EMAIL: liviu.birsan@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys46°57'51"N 021°58'09"E 46°57'51"N 021°58'09"E 46°57'51"N 021°58'09"E 46°57'51"N 021°58'09"E 46°57'51"N 021°58'09"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 H2420 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 kHz - 6 GHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 37 m. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 8-element circular antenna array for reception and direction finding of vertically polarized waves in the frequency range 1300 MHz to 6000 MHz. If necessary, measurements are carried out by mobile monitoring stations (van), on request, all over Romanian territory. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 9-element circular antenna array with quadrature multiplexer for signal processing with a single receiver in the frequency range 20 MHz to 1300 MHz (horizontal and vertical polarization). Correlative. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request. On request. All days of week. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request.
SMG Satu Mare (IMS)
SMG Satu Mare (IMS)Remote Monitoring Station Satu Mare RomaniaPHONE: +40 372 845318 PHONE: +40 372 845508 EMAIL: iulian.mihalcea@ancom.ro EMAIL: liviu.birsan@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys47°48'52"N 022°52'37"E 47°48'52"N 022°52'37"E 47°48'52"N 022°52'37"E 47°48'52"N 022°52'37"E 47°48'52"N 022°52'37"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 H2420 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 kHz - 6 GHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 57 m. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 8-element circular antenna array for reception and direction finding of vertically polarized waves in the frequency range 1300 MHz to 6000 MHz. If necessary, measurements are carried out by mobile monitoring stations (van), on request, all over Romanian territory. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 9-element circular antenna array with quadrature multiplexer for signal processing with a single receiver in the frequency range 20 MHz to 1300 MHz (horizontal and vertical polarization). Correlative. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request. On request. All days of week. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request.
SMG Suceava (IMS)
SMG Suceava (IMS)Remote Monitoring Station Ipotesti RomaniaPHONE: +40 372 845318 PHONE: +40 372 845508 EMAIL: iulian.mihalcea@ancom.ro EMAIL: liviu.birsan@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys47°36'57"N 026°17'09"E 47°36'57"N 026°17'09"E 47°36'57"N 026°17'09"E 47°36'57"N 026°17'09"E 47°36'57"N 026°17'09"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 H2420 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 kHz - 6 GHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 27 m. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 8-element circular antenna array for reception and direction finding of vertically polarized waves in the frequency range 1300 MHz to 6000 MHz. If necessary, measurements are carried out by mobile monitoring stations (van), on request, all over Romanian territory. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 9-element circular antenna array with quadrature multiplexer for signal processing with a single receiver in the frequency range 20 MHz to 1300 MHz (horizontal and vertical polarization). Correlative. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request. On request. All days of week. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request.
SMG Timisoara (IMS)
SMG Timisoara (IMS)Remote Monitoring Station Ianova RomaniaPHONE: +40 372 845318 PHONE: +40 372 845508 EMAIL: iulian.mihalcea@ancom.ro EMAIL: liviu.birsan@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys45°50'26"N 021°24'45"E 45°50'26"N 021°24'45"E 45°50'26"N 021°24'45"E 45°50'26"N 021°24'45"E 45°50'26"N 021°24'45"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 H2420 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 kHz - 6 GHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 37 m. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 8-element circular antenna array for reception and direction finding of vertically polarized waves in the frequency range 1300 MHz to 6000 MHz. If necessary, measurements are carried out by mobile monitoring stations (van), on request, all over Romanian territory. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 9-element circular antenna array with quadrature multiplexer for signal processing with a single receiver in the frequency range 20 MHz to 1300 MHz (horizontal and vertical polarization). Correlative. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request. On request. All days of week. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request.
SMG Tulcea (IMS)
SMG Tulcea (IMS)Remote Monitoring Station Nufaru RomaniaPHONE: +40 372 845318 PHONE: +40 372 845508 EMAIL: iulian.mihalcea@ancom.ro EMAIL: liviu.birsan@ancom.roFrequency measurements Field strength or power flux-density measurements Direction-finding measurements Bandwidth measurements Automatic spectrum occupancy surveys45°07'02"N 028°57'31"E 45°07'02"N 028°57'31"E 45°07'02"N 028°57'31"E 45°07'02"N 028°57'31"E 45°07'02"N 028°57'31"E0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 0600-1400 (MON-THU) 0600-1130 H2420 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 MHz - 6 GHz 20 kHz - 6 GHzHours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). Remotely controlled monitoring station. Height of antenna: 37 m. Hours of service from Monday to Friday (local time). Remotely controlled monitoring station. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 8-element circular antenna array for reception and direction finding of vertically polarized waves in the frequency range 1300 MHz to 6000 MHz. If necessary, measurements are carried out by mobile monitoring stations (van), on request, all over Romanian territory. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). 9-element circular antenna array with quadrature multiplexer for signal processing with a single receiver in the frequency range 20 MHz to 1300 MHz (horizontal and vertical polarization). Correlative. Remotely controlled monitoring station. Hours of service from Monday to Thursday: 0900-1700 h (local time). Friday: 0900-1430 h (local time). An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request. On request. All days of week. An electronic result (.jpg for waterfall plots and .xls for field strengths) is available upon request.