I bought this based upon some of the other reviews. I needed something small that did not stick out as it was going to be plugged into a Raspberry Pi in a confined space.
Reason for buying was to detect a Byron B30141A doorbell being pressed.
I wanted the doorbell receiver in the front room for whoever was sitting in there so they could hear it.
I also wanted to know when I was at work upstairs when the doorbell had been pressed.
As this was just transmitting on 433Mz and a bit, then this rtl-sdr dongle should do the trick.
I installed it on a Raspberry Pi running PiOS 64bit.
Installed the rtl-sdr, gqrx using apt, downloaded from GitHub merbanan/rtl_433 and compiled.
First had to locate (home in on) the frequency, so used the gqrx.
Turned that into 433mhz and then watched when I pressed the bell a few times.
Blow and behold the signal was just slightly off to the right.
Armed with the actual frequency I could tell rtl_433 that and then use it to unpick the PWM signal.
I needed up with around 20 versions.
Also the bell is known to transmit around 20 difference codes changing at will.
So press the bell a few times to see what comes out.
Now I have the pwm setup, I use rtl_433 to send an MQTT message onto Node-Red.
There I can interrogate the message to see if it really was my doorbell and if so send it on to a Home Assistant notification and to another MQTT topic, which then pings most of my apple devices and my Pc running linux which is hooked into the MQTT topic and Home Assistant.
Success it works.
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This item: NooElec NESDR Nano 2+ Tiny Black RTL-SDR USB Set (RTL2832U + R820T2) with Ultra-Low Phase Noise 0.5PPM TCXO & MCX Antenna. Software Defined Radio, DVB-T and ADS-B Compatible, ESD Safe
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This item  NooElec NESDR Nano 2+ Tiny Black RTL-SDR USB Set (RTL2832U + R820T2) with Ultra-Low Phase Noise 0.5PPM TCXO & MCX Antenna. Software Defined Radio, DVB-T and ADS-B Compatible, ESD Safe | Recommendations  | ?  | ?  | ?  | ?  | |
| Price | ?40.39 | ?36.92 | ?70.49 | ?40.98 | ?43.04 | ?35.67 |
| Delivery | Get it as soon as Wednesday, Jan 22 | Get it as soon as Wednesday, Jan 22 | Get it as soon as Wednesday, Jan 22 | Get it as soon as Wednesday, Jan 22 | Get it as soon as Wednesday, Jan 22 | Get it as soon as Wednesday, Jan 22 |
| Customer Ratings | ||||||
| Sold by | Nooelec Inc | Nooelec Inc | AMALTAS LONDON LIMITED | TechnoFix UK | TechnoFix UK | Nooelec Inc |
| connector type | usb | USB | SMA | SMA | SMA F connector | usb |
| antenna description | Radio | Radio | Satellite, Radio | Radio | Radio | Radio |
| connectivity tech | USB | Ethernet | USB | Radio Frequency | Radio Frequency | USB |
| tuner technology | Digital | FM | Digital | ADS-B | Digital | ADS-B, DVB-T |
| platform | android | windows, android, linux | windows, android, linux | windows, android, linux | windows, android, linux | windows |
| video output format | mpeg 4 | mpeg 4 | ¡ª | mpeg 4 | ¡ª | mpeg 4 |
| remote included | ? | ? | ? | ? | ? | ? |
