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Contact WesleySizemore to report RFI

Table of Known RFI

Sky Frequency (MHz) GBT Receiver Band Signal Characteristics GBT Azimuth GBT Elevation Date Reported Detected From Source Identification Source Location Comments
155.295 RxBand 20K0F3E (207w ERP) AZ EL existing   Pocahontas Co. E911 Snowshoe, WV Waiver granted; Infrequent activity, but very strong
155.34 RxBand (45w,100w) AZ EL existing   Pocahontas Co. E911 Snowshoe & Durbin, WV Waiver granted; Infrequent activity, but very strong
155.4? RxBand Sig Ch AZ EL existing   Pocahontas County Emerg. Svc.   Waiver granted; Infrequent activity, but very strong
155.595 RxBand (45w ERP) AZ EL existing   Pocahontas Co. E911 Snowshoe, WV Waiver granted; Infrequent activity, but very strong
155.97 RxBand (45w ERP) AZ EL existing   Pocahontas Co. E911 Snowshoe, WV Waiver granted; Infrequent activity, but very strong
162.400 RxBand Sig Ch AZ EL existing   NOAA Weather Radio    
162.425 RxBand Sig Ch AZ EL existing   NOAA Weather Radio    
162.450 RxBand Sig Ch AZ EL existing   NOAA Weather Radio    
162.425 RxBand Sig Ch AZ EL existing   NOAA Weather Radio    
162.500 RxBand Sig Ch AZ EL existing   NOAA Weather Radio    
162.525 RxBand Sig Ch AZ EL existing   NOAA Weather Radio    
162.550 RxBand Sig Ch AZ EL existing   NOAA Weather Radio    
163.25 RxBand Sig Ch AZ EL existing Monitoring Station   Medical Radiocommunication; various sites outside NRQZ  
169.425 RxBand Sig Ch AZ EL existing   AFWS IFLOWS network various WV TX's Active during rain
169.475 RxBand Sig Ch AZ EL existing   AFWS IFLOWS network various WV TX's Active during rain
169.500 RxBand Sig Ch AZ EL existing   AFWS IFLOWS network various WV TX's Active during rain
169.525 RxBand Sig Ch AZ EL existing   AFWS IFLOWS network various WV TX's Active during rain
170.325 RxBand Sig Ch AZ EL existing   AFWS IFLOWS network various WV TX's Active during rain
171.0375 RxBand Sig Ch AZ EL existing   AFWS IFLOWS network various WV TX's Active during rain
171.525 RxBand Sig Ch 180   Existing   Monitoring Station   U. S. Forest Service, Bald Knob, VA
171.825 RxBand Sig Ch AZ EL existing   AFWS IFLOWS network various WV TX's Active during rain
171.875 RxBand Sig Ch AZ EL existing   AFWS IFLOWS network various WV TX's Active during rain
280-390 PF1-340 2 MHz comb AZ EL 5/1/03 GBT GBT Active Surface   If present, power active surface off; cage hardware to be replaced in Feb 06
322.56 PF1-340 continuously present AZ EL Cycle7 2005 Mobile RFI search GBT Air Handler Controller NRAO Controller will be replaced; check PF1-340 after replacement
324.7 PF1-340 44dB over continuum limit per Anechoic chamber AZ EL 7/15/03 Mobile RFI search Doorbell Harold Crist, Arbovale COMMENTS
327-332 PF1-340 Sig Ch AZ EL 1/30/04 Mobile RFI search Source ID Rabbit Patch house #4 COMMENTS
332.6 PF1-340 Sig Ch AZ EL 9/4/03 GBT Source ID LOC likely FAA
353.9 PF1-340 Sig Ch AZ EL 6/3/03 GBT Source ID LOC FAA air to ground comm; possible tx at Buena Vista VA
400.1 PF1-450 narrowband UHF CW beacon - always present AZ EL 10/15/03 GBT Orbcomm LOC Satellite timing signal
406.125 PF1-450 Sig Ch AZ EL existing   AFWS IFLOWS network    
408.715 PF1-450 Sig Ch AZ EL 10/30/03 GBT Source ID LOC Jeff Millman's plot 18C
408.77 PF1-450 Sig Ch AZ EL 10/30/03 GBT Source ID LOC Jeff Millman's plot 18C
409.675 PF1-450 0.01 MHz BW 226.1 EL 10/15/2003 GBT IFLOWS Repeater Keeney Mtn near Alderson, WV (outside NRQZ) In RA band; found during PF450 scan; Ref US13 footnotes; On Oct 21, this site restored to a 25w store&forward
422.8 PF1-450 Sig Ch AZ EL 10/19/03 GBT Source ID LOC COMMENTS
430.05 PF1-450 Sig Ch AZ EL 8/6/04 GBT Source ID LOC COMMENTS
432.305 PF1-450 CW 146.9 EL 10/19/03 GBT Gene Wood, WA4PGI Bald Knob, Bath Co. VA Gene agrees to shutdown per amateur agreement at request of NRAO - Contact Denise Wirt at x2107
432-434 PF1-450 Sig Ch AZ EL 10/19/03 GBT Source ID LOC COMMENTS
444.175 PF1-450 intermittent spike AZ EL 4/9/05 GBT     Strongest in the West; not detected in the Southeast
443-446 PF1-450 Sig Ch AZ EL 10/19/03 GBT Source ID LOC COMMENTS
451.025 PF1-450 Sig Ch AZ EL potential Det From KDA670 Elliott Knob, VA Augusta Co.
451.075 PF1-450 Sig Ch AZ EL potential Det From KDA670 Elliott Knob, VA Augusta Co.
453.75 PF1-450 Sig Ch AZ EL 2/22/05 Monitoring Station WNMW815 Elliott Knob, VA Augusta Co.
453.925 PF1-450 Sig Ch AZ EL 2/23/05 Monitoring Station WPMQ964 Elliott Knob, VA Augusta Co.
460.3 PF1-450 Sig Ch AZ EL potential Det From WPEH291 Elliott Knob, VA Augusta Co.
460.4 PF1-450 Sig Ch AZ EL 2/22/05 Monitoring Station KNFY393 Elliott Knob, VA Augusta Co.
460.55 PF1-450 Sig Ch AZ EL potential Det From WPKQ976 Elliott Knob, VA Augusta Co.
462.875 PF1-450 Sig Ch 225.9 EL 1/3/04 Monitoring Station Black Bear Paging Keeney Mtn. near Alderson, WV (outside NRQZ) Most active during normal waking hours
471.25? PF1-450 Sig Ch AZ EL existing GBT Ch. 15 Roanoke, VA analog TV station
471.25-801.25 PF1-450, PF1-800 Sig Ch AZ EL existing GBT UHF TV   See CATV TV Frequency guide. Report CATV to WesleySizemore.
481.75, 483.25 PF1-450 Strong AZ EL 3/5/04 GBT TV LOC Reported by observer on Observer comments
500-506 PF1-450 entire band AZ EL existing GBT digital TV Roanoke, VA COMMENTS
~710 PF1-800 outbursts, broadband (digital?) AZ EL 1/28/04 GBT     Observer reported several outbursts of broad band (digital?) RFI near 710 MHz
741.25 PF1-800 Sig Ch AZ EL 2/25/04 Det From W59AC TV New Market, VA (outside NRQZ) COMMENTS
745.75 PF1-800 Sig Ch AZ EL 2/25/04 Det From W59AC TV New Market, VA (outside NRQZ) COMMENTS
835+/-1 PF1-800 Sig Ch AZ EL 3/25/05 GBT     824-849 MHz is allocated to mobile cellular telephone
  PF1-800 Sig Ch AZ EL 3/5/05 GBT Source ID LOC On many occasions, there is a birdie at ~ 28.76 Hz fluctuation frequency within the 800 MHz band that is VERY strong
858.2875 PF1-800 Sig Ch 149.7 EL 9/25/03 Monitoring Station AEP Tobacco Row Mtn. voice detected
879.69 PF1-800 Sig Ch AZ EL 9/25/03 Monitoring Station Highland Cellular Alta/Sam Black (outside NRQZ) Cell. ctrl ch 323
879.87 PF1-800 Sig Ch AZ EL 9/25/03 Monitoring Station Highland Cellular Muddy Creek Mtn (outside NRQZ) Cell. ctrl ch 329
880.26 PF1-800 Sig Ch 219.8 EL 9/25/03 Monitoring Station US Cellular Muddy Creek Mtn Cell. ctrl ch 342
894-896 PF1-800 Sig Ch AZ EL existing GBT Airphones   Always present
902-1240 PF2, L Band Sig Ch AZ EL 4/5/04 Monitoring Station Source ID LOC See Spectrum Summary
945.00 PF2 AM Studio to Tx link as seen from AZ 142.8 EL 30.54 9/27/06 GBT WHY402 SourceID945 Carter's Mtn (outside NRQZ) Confirmed via on/off 9/28/06
947.00 PF2 AM Studio to Tx link as seen from AZ 142.8 EL 30.54 9/27/06 GBT WVMR Horse Ridge Tx Confirmed via AM demod on 9/28/06; Working w/engineer to mitigate
1256, 1292 L Band Sig Ch AZ EL existing GBT Bedford radar Bedford, VA See R. Fisher's Analysis of Radar Data from February 6, 2001
1227.6 L Band Sig Ch AZ EL existing Det From GPS transmitter LOC COMMENTS
1415 L Band 5 MHz birdie AZ EL 4/5/03 GBT     Observer reported consistent 5 MHz birdie
1575.42 L Band Sig Ch AZ EL existing Det From GPS transmitter LOC COMMENTS
2200 S Band SigCh AZ EL 4/4/06 GBT Source ID LOC T. Minter ISS satelite?
2320-2345 S Band Sig Ch AZ EL existing Det From Sirius/XM Satellite radio Sirius and XM satellites Very strong RFI: avoid this band at all costs!
5440 C Band CW AZ EL 3/13/06 GBT, Mon.Sta Satellite? LOC http://wiki.gb.nrao.edu/bin/view/Electronics/CbandReceiver http://www.aoc.nrao.edu/evla/geninfo/memoseries/evlamemo54.pdf
8850.7 X Band Sig Ch AZ EL 9/24/03 GBT Source ID LOC COMMENTS
8854 X Band Sig Ch AZ EL 9/24/03 GBT Source ID LOC COMMENTS
8904 X Band Sig Ch AZ EL 9/24/03 GBT Source ID LOC COMMENTS
8914.3 X Band Sig Ch AZ EL 9/24/03 GBT Source ID LOC COMMENTS
8953.3 X Band Sig Ch AZ EL 9/24/03 GBT Source ID LOC COMMENTS
8957.8 X Band Sig Ch AZ EL 9/24/03 GBT Source ID LOC COMMENTS
9026.6 X Band Sig Ch AZ EL 9/24/03 GBT Source ID LOC COMMENTS
9054.5 X Band Sig Ch 0 38 9/24/03 GBT Source ID LOC Around 19:30 ET (burst of RFI)
9105.8 X Band Sig Ch 300.4 77.85 9/24/03 DetFrom? Source ID LOC Around 17:30 ET
9107.1 X Band Sig Ch AZ EL 9/24/03 GBT Source ID LOC Strongest signal
9186.9 X Band Sig Ch 182 34 9/24/03 GBT Source ID LOC Around 01:30 ET
9840 X Band 20 MHz BW 80 30 10/9/03 GBT Source ID LOC 90 second burst; present approx 15 minutes continually until 18:00, 10/7/03
12000-12700 Ku Band Sig Ch 90 to 270 <40 4/20/04 GBT Source ID LOC Satellite TV transmission
17700-20200 K Band Sig Ch AZ EL 11/2/04 GBT Source ID LOC See Spectrum Summary
FREQ RxBand Sig Ch AZ EL DATE Det From Source ID LOC COMMENTS
FREQ RxBand Sig Ch AZ EL DATE Det From Source ID LOC COMMENTS
FREQ RxBand Sig Ch AZ EL DATE Det From Source ID LOC COMMENTS

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