SDR Hwæt｜軟體無線電接收軟體

English

Overview

SDR Hwæt is a software-defined radio receiver for Windows. Plug in an SDR such as an RTL-SDR dongle and it becomes an FM, medium-wave, shortwave and DAB+ radio, a weather-satellite image receiver, a digital TV set, and a general-purpose receiver for the airband, marine and amateur bands.

Broadcast

FM with stereo and RDS, medium wave, shortwave and DAB/DAB+, with one-click station scan.

Weather satellites

Images from METEOR-M2, GOES-18/19 and GK-2A, with pass prediction and automatic reception.

Digital TV

DVB-T, ISDB-T and ATSC, with channel scan, programme guide, snapshots and recording.

Receiver

Nine demodulation modes, band presets, bookmarks, and audio or I/Q recording.

Broadcast

Choose FM, MW, SW or DAB in the sidebar and press Scan stations; every station found is listed with its signal strength. FM plays in stereo and shows the RDS station name and programme type. The spectrum and waterfall show the whole band, and clicking a peak tunes to it.

SDR Hwæt playing FM 90.9 MHz, with the spectrum, waterfall and station list — FM broadcast. The shaded band is the station being played.

AI denoise removes the hiss from weak stations. It runs DeepFilterNet3 through OpenVINO on the Intel NPU when the computer has one, and falls back to the GPU or the CPU.

Weather satellites

The satellite list shows each satellite's frequency and status, and the passes coming up over your location. Orbital elements are downloaded from CelesTrak and passes are predicted with SGP4. With automatic reception on, SDR Hwæt starts receiving when a satellite rises and saves the image as a PNG when it sets. Recordings can be decoded afterwards as well.

A METEOR-M2 LRPT image received by SDR Hwæt — METEOR-M2 LRPT. Recent images are kept on the right.

Satellite	Signal	Notes
METEOR-M2 3, M2 4	137.9 MHz LRPT	Polar orbit; a 137 MHz antenna is enough.
GOES-18, GOES-19	1694.1 MHz HRIT	Geostationary; needs a dish pointed at the satellite.
GK-2A	1692.14 MHz LRIT	Geostationary; needs a dish pointed at the satellite.
NOAA 15, 18, 19	137 MHz APT	Retired in 2025; recordings can still be decoded.

Digital TV

Scan the channels for your region, then pick a programme. The panel on the right shows signal quality, modulation, bit rate, video and audio formats, and the programme guide. Snapshots, recording the current programme or the whole multiplex, and full screen are one click away. Recorded TS files can be played back too.

SDR Hwæt showing a DVB-T programme on channel 32 with signal details — DVB-T on CH 32 (581 MHz), with the signal and programme details on the right.

Standard	Regions	Demodulation
DVB-T	Taiwan, Europe, Australia	The RTL-SDR's own hardware demodulator; software on other SDRs.
ISDB-T	Japan, Brazil	Software. Narrow devices such as the RTL-SDR receive the 1-seg layer.
ATSC	United States, South Korea	Software. Needs an SDR that covers 6 MHz, such as Airspy, HackRF or ADALM-Pluto.

DTMB, used in China, is not supported.

Receiver

For everything else, tune anywhere the device reaches and choose a demodulation mode and bandwidth. Presets cover the airband, marine VHF, amateur 2 m and 70 cm, PMR446, CB, AIS and ADS-B, and any frequency can be bookmarked.

Mode	Typical use
WFM	FM broadcast.
NFM	Two-way radio, amateur and marine VHF.
AM, sync AM	Airband, medium wave and shortwave.
USB, LSB, DSB	Amateur and utility sideband stations.
CW	Morse code.
I/Q	Raw I/Q, for recording a signal to decode later.

Audio and I/Q can both be recorded. I/Q recordings are WAV files with the same layout as SDR# and HDSDR, so they open in either program, and SDR Hwæt plays them back as a signal source.

Supported devices

Connection	Devices
USB	RTL-SDR (RTL2832U), Airspy R2 / Mini, Airspy HF+, HackRF One, SDRplay RSP series, ADALM-Pluto, and LimeSDR, bladeRF or USRP through SoapySDR.
Network	rtl_tcp, SpyServer, KiwiSDR, Hermes-Lite 2.
File	I/Q recordings (WAV) and MPEG-TS.

Drivers. The installer can add the WinUSB driver for the RTL-SDR, so the dongle works as soon as it is plugged in. The SDRplay RSP series needs the SDRplay API, and SoapySDR devices need PothosSDR.

SDR Hwæt can also share its RTL-SDR on the local network as an rtl_tcp server, for SDR#, SDR++, GQRX or another copy of SDR Hwæt.

繁體中文

功能簡介

SDR Hwæt 是一款 Windows 的軟體無線電（SDR）接收軟體。插上 RTL-SDR 等 SDR 裝置，就能收聽 FM、中波、短波與 DAB+ 廣播，接收氣象衛星雲圖，收看數位電視，也能當作通用接收機監聽航空、海事與業餘無線電頻段。

廣播

FM（立體聲、RDS）、中波、短波與 DAB／DAB+，一鍵掃描電台。

氣象衛星

接收 METEOR-M2、GOES-18／19 與 GK-2A 的雲圖，預測過境並自動接收。

數位電視

DVB-T、ISDB-T 與 ATSC，支援頻道掃描、節目表、截圖與錄影。

通用接收

九種解調方式、常用頻段、書籤，可錄製音訊或 I/Q。

廣播

於側欄選擇 FM、中波、短波或 DAB，按下「掃描電台」，找到的電台會連同訊號強度一併列出。 FM 以立體聲播放，並顯示 RDS 的電台名稱與節目類型。上方的頻譜與瀑布圖呈現整個頻段，點選訊號峰即可轉到該電台。

SDR Hwæt 收聽 FM 90.9 MHz，畫面上有頻譜、瀑布圖與電台清單 — FM 廣播。底色標示的範圍就是正在播放的電台。

「AI 降噪」可去除微弱電台的沙沙聲。以 OpenVINO 執行 DeepFilterNet3，電腦有 Intel NPU 時優先使用 NPU，沒有時改用 GPU 或 CPU。

氣象衛星

衛星清單會列出每顆衛星的頻率與狀態，以及即將通過觀測地點上空的過境時間。軌道資料從 CelesTrak 下載，以 SGP4 預測過境。開啟「過境時自動接收」後，衛星升起時會自動開始接收，落下時把影像存成 PNG。錄下來的檔案也可以事後再解碼。

SDR Hwæt 接收到的 METEOR-M2 LRPT 雲圖 — METEOR-M2 LRPT。右側保留最近收到的影像。

衛星	訊號	說明
METEOR-M2 3、M2 4	137.9 MHz LRPT	極軌衛星，使用 137 MHz 的天線即可接收。
GOES-18、GOES-19	1694.1 MHz HRIT	地球同步衛星，需要對準衛星的碟形天線。
GK-2A	1692.14 MHz LRIT	地球同步衛星，需要對準衛星的碟形天線。
NOAA 15、18、19	137 MHz APT	已於 2025 年除役，仍可解碼錄音檔。

數位電視

依所在地區掃描頻道後，選擇節目即可收看。右側面板顯示訊號品質、調變方式、位元率、影音格式與節目表；截圖、錄製目前節目或整個頻道、全螢幕都只要按一下。錄下來的 TS 檔也可以直接播放。

SDR Hwæt 收看 CH 32 的 DVB-T 節目，右側顯示訊號資訊 — DVB-T 的 CH 32（581 MHz），右側是訊號與節目資訊。

制式	地區	解調方式
DVB-T	台灣、歐洲、澳洲	RTL-SDR 使用晶片內建的硬體解調，其他 SDR 使用軟體解調。
ISDB-T	日本、巴西	軟體解調。RTL-SDR 等頻寬較窄的裝置只接收 1-seg。
ATSC	美國、韓國	軟體解調。需要頻寬達 6 MHz 的 SDR，例如 Airspy、HackRF 或 ADALM-Pluto。

中國使用的 DTMB 目前不支援。

通用接收

其他用途可調到裝置涵蓋的任何頻率，自行選擇解調方式與頻寬。「常用頻段」內建航空、海事、業餘 2 公尺與 70 公分、PMR446、民用頻段、AIS 與 ADS-B，任何頻率都可以加入書籤。

解調方式	常見用途
寬頻 FM	FM 廣播。
窄頻 FM	無線電對講機、業餘無線電與海事頻道。
AM、同步 AM	航空頻道、中波與短波。
上邊帶、下邊帶、雙邊帶	業餘無線電與各類邊帶通訊。
摩斯電碼	CW 電報。
I/Q	原始 I/Q，用於錄下訊號事後解碼。

音訊與 I/Q 都可以錄製。I/Q 錄音檔是與 SDR#、HDSDR 相同格式的 WAV，兩者都能開啟，SDR Hwæt 也能把它當作訊號來源播放。

支援裝置

連接方式	裝置
USB	RTL-SDR（RTL2832U）、Airspy R2／Mini、Airspy HF+、HackRF One、SDRplay RSP 系列、ADALM-Pluto，以及透過 SoapySDR 使用的 LimeSDR、bladeRF、USRP。
網路	rtl_tcp、SpyServer、KiwiSDR、Hermes-Lite 2。
檔案	I/Q 錄音檔（WAV）與 MPEG-TS。

驅動程式。安裝檔可一併為 RTL-SDR 安裝 WinUSB 驅動，插上即可使用。 SDRplay RSP 系列需要 SDRplay API，SoapySDR 的裝置需要 PothosSDR。

SDR Hwæt 也能以 rtl_tcp 伺服器的形式，把 RTL-SDR 分享給區域網路上的 SDR#、SDR++、GQRX 或另一台 SDR Hwæt 使用。