RTL-SDR ブログ V4 R828D RTL2832U 1PPM TCXO SMA ソフトウェア定義ラジオ(ドングルのみ)

類似品と比べると多少お値段はしますが安定度は抜群です。piawareなどで連続動作させる場合は間違いなくこれを選ぶべきです。 たまにSDR立ち上げる程度なら類似品でも良いかと。

ローカルFM局の放送監視アプリ作成で利用。搬送波と音量の監視。 24時間運用でも安定、ちょっと熱持つかな。 高級チューナーよりは受信弱いけど、強い電波なら問題なしでした。

以前に使用していた、SDRドングルより、安定した、受信が出来ています。 特に、耳で聞き取れない微弱な、信号でも、FT-8が受信出来るのが、素晴らしいです。 評判通りの商品で、満足しています。

アマゾンなどには、RTL-SDRの偽物が結構あるようですが、これは正規のRTL-SDRなのでこれを買えば正解です

ワンセグチューナーでRTL-SDRをやっていましたが、ダイレクトサンプリングでの短波の受信性能の限界を感じていたのでHFコンバーター内蔵のこのチューナーを購入しました。簡単な説明書が付いていて日本語の説明文もあります。 既にRTL-SDRをやっていても、従来のドライバーのままでは使えないのでこのチューナー専用のドライバーをインストールする必要があります。あとは使うソフトに応じて必要なEXT-IOやDLLを準備するか、このチューナーに対応したバージョンにアップデートします。ソフトを起ち上げたあとの設定はソフトによって表示が違い、HFコンバータをイネーブルにする、I-Qサンプリングを選択する（これでダイレクトサンプリングがオフになるのでHF以下の周波数では自動でHFコンバータが動作します。）、サンプリング方法が固定されて選択出来ない場合はそのままでOK等があるのでソフトの表示を見てHFが受信できる状態に設定しておきます。これでＨＦコンバータのオン/オフ、周波数表示のシフト設定のオン/オフ、サンプリング方法の切り替えを気にせずに受信周波数の設定だけでHF⇔V/UHFを自由に行き来できます。 HFを受信してみるとダイレクトサンプリング特有の不正受信（FM放送の混入、7MHｚの信号が21ＭＨｚでも受信出来る等）がなくなり、コンバータの効果が実感できました。 エアーバンドやＡＤＳＢも問題なく受信できました。 安定度も良く周波数ズレもあまり気になりません。 使用中かなり発熱するけどこれはRTL-SDR特有のものなので仕方ないですね。

Been great using this to listen on the HF bands using SDR Sharp. Also cool to be able to use it to track aircraft with ADS-B.

価格の割に高性能です。v3より感度が良いと感じます。PCで動作に問題があった時は、給電も疑ってみて下さい。USBハブ等は通さずにPCと直接接続して下さい。

I decided to replace my V3 with the V4 based on having a built in up-converter and better internal heat sink. It works very well without the strange shifting and mixing I used to get with the V3 using Q Branch Sampling. I read that the V4 has a bit of lose in signal gain, however, I have not seen that at all.

Ottima, sotto tanti punti di vista. Bisogna fare riferimento alla documentazione ufficiale riportata nel sito. Bisogno installare driver e librerie C++ per farla funzionare. Poi va utilizzato uno dei tanti software a disposizione. L`ho installata con successo su Win11, Kali e Mac. Per linux bisogna aggiornare il source packages, ma con un pò di pazienza funziona tutto. L`utilizzo dei software come ad esempio sdr++, può avvenire solo dopo aver configurato correttamente i drivers. Funziona, basta seguire le guide. Dotatevi di antenne adeguate.

Funcionou perfeitamente

Maybe nice for some other frequencies, but doesn't want to pick up anything around 868mhz, so avoid if you're using it for FLARM etc.

I love this thing. Probably my favorite gadget of all time. Plug this into a USB port on your laptop and attach an antenna (not included) and you unlock a whole new world of software defined radio (SDR). This tiny dongle acts as a wide band radio receiver - the sort of thing that would have been the size of a shoebox a few years ago. I’ve used mine to feed aircraft position data to flight tracking websites (PlaneFinder, FlightAware, etc.), to intercept and decode signals from satellites, the international space station, and my neighbours weather station. You can listen to Ham radio operators, marine traffic, CB radio and even air traffic control talking to planes flying overhead. You can also use it to listen to DAB radio. It’s a seriously capable bit of kit in a compact package. For anyone interested in radio, this is a great way to get into what will quickly become an absorbing hobby. Minor point, but it tends to run quite hot to the touch. It might be obvious, but you can’t transmit with this - it’s just a receiver.

Fantastic for the price. I got one of the first SDR Play RSPdx boxes and was completely disappointed. The hardware seems like it could be good but the software is an unusable mess, and getting all the switching and filtering to work with other software never worked. After being frustrated with endless trouble tickets and support that clearly didn't have a clue, I gave up. I had a buyer for the SDR Play on craigs but at the end of the day I wouldn't have been able to sleep after selling him that useless piece of garbage. Fast forward to the RTL-SDR V3 with a HamItUp. Worked a lot better than the SDR Play (what doesn't?) but it was noisy and switching it on and off and turning on the offset in the software was a pain. I ordered the RTL-SDR V4 the moment I first saw it and I am impressed. It works (unlike the SDR Play, which isn't even a good paperweight), it's several dB quieter than the HamItUp and there is no offset to deal with. This is a real winner, and at the price it's a bargain. I have a couple of V4 in the USB-C version on order and can't wait to get them.