Welcome to Washington DC Area SDR HF radio receiver system maintained by NA5B, Mehmet, e-mail na5b@hotmail.com
This receiver covers VLF/LF/MF/HF - 160m, 80m, 40m, 30m, 25m, 20m, 15m, 11&10m Amateur Bands (Atomic Clock, Data, Lightning, Beacons, AM broadcast, CB)
Current system brief description; Antennas: Active Mini Whip - Multiband Dipol & Cuschcraft R-7 Server: 64 Bit Linux (Debian) with fiberoptic gigabit connection. 
RTL-SDR dongles and homebrew upconverter, bandpass filters. For VHF-UHF SDR click here: http://na5b.com:8902. For the web site click here: http://na5b.com
More information about the WebSDR project can be found on http://www.websdr.org. Other SDR's: UTAH UT - KFS CA - K3FEF PA - NY4Q GA - N4DKD AL - WCRC TX

Thank you to AD8AE, K1LWC, WD5GWC, AB3VN, W5AWG, W7HB, KN4VV, N4RLI and KZ3AB for their donations.
* A high stability central local oscillator has been installed for all sdr's for better frequency stability. It is being tested. (19 May 2019)
** This WebSDR is compatible with Pocket RxTx App for Android (available in the PLAY STORE) for more info: YO3GGX, Dan
This site GUI includes some features by PA3FWM from University of Twente, Topband, Poland Nowy Sacz and other WebSDR sites.

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View:

Allow keyboard:

j k ← →	freq. down/up (+shift/ctrl/alt faster)
u l c a f	USB, LSB, CW, AM, FM
W w	filter wider/narrower
z Z ^Z	center/zoom waterfall
g	enter frequency
b B	change band
m V v	mute, volume up/down
t T	VFOs: toggle A/B, set A=B

Loading waterfall... Please Wait.

FREQUENCY: kHz.  VFO:

Or tune by clicking/dragging/scrollwheel on the frequency scale.

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Mode:

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Bandwidth tuning & presets:
? kHz @ 0dB; ? kHz @ -6dB; ? kHz @ -60dB. [ ? / ? ] Or drag the passband edges on the frequency scale

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Memories:  

Waterfall view: Full window



Or use scroll wheel and dragging
on waterfall.

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View: spectrum waterfall weak sigs strong sigs Size: tiny small normal medium large X-large Speed: slower slow medium fast

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S-Meter

Sig?dBm PK?dBm N?dB SNR?dB

Mute Squelch Auto-notch

VOLUME:  

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GAIN CONTROL: automatic manual

Gain:

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E-Field @ Washington DC Area
(experimental VLF 0-20kHz RX live)

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Audio record: start

Your browser does not seem to support downloading the recording; please try a recent version of Firefox, Chrome or Opera.

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Signal strength plot: none fast slow

Logbook:

Call of station that you hear: Comments, if any:

Note: time, frequency, your name/call, and DXCC information are added automatically. View the last 20 lines of the logbook, or the entire logbook (ctrl-click for new tab/window).

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Station information:
Lookup in databases  

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This WebSDR is currently being used by ? user(s) simultaneously:      compact view

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Chatbox:    This chatbox is intended to discuss the operation of the WebSDR and about the signals received with it.
The operators of this site disclaim any responsibility for text appearing in this chatbox.

 

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NA5B HF Server Statistics:

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** Visitor window added on 20 Dec 2017 **