RF

2in1 Wireless and Wired Microphone

I got a very cheap wired/wireless mic  from Wish.com. I plan was to have a cheap “disposable” microphone for uses where I don’t want risking the more expensive microphone. Basically the product looks OK. The construction is plastic, but till feels acceptable for the price (less than 10 Euros on sale). If I get this

Battery for NanoVNA

I had earlier written about NanoVNA and how the device I got came without battery. The device supports rechargeable LiPo batteries, but the batteries are not included on the model I bought because of the safety of international transportation. I also liked to have the LiPo battery installed on my device. The device has battery

Testing NanoVNA

NanoVNA is very tiny handheld Vector Network Analyzer (VNA). A vector network analyzer (VNA) is an instrument that can be used to measure antenna or coax parameters such as SWR, impedance and loss. It can also be used to characterize and tune filters. It is a very useful tool to have if you are building

NanoVNA handheld Vector Network Analyzer (VNA)

NanoVNA is a small handheld Vector Network Analyzer (VNA). It is equippedwith lcd display, portable device with battery(battery not included). This project aim to provide an RF gadget but useful instrument for enthusiast. The device hardware offers 50k-300MHz frequency range that can be expended up to 900 MHz (with somewhat less dynamics on higher frequencies).

Cheap spectrum analyzer and signal generator

In search for some cheap and useful RF test hardware, I came by Geekcreit® Spectrum Analyzer USB LTDZ_35-4400M_Spectrum Signal Source with Tracking Source Module RF Frequency Domain Analysis Tool at sale price of aroundy $30/EURO30. It looked to have quite promising specifications: Attribute: RF frequency domain analysis tool Interface: usb Power supply: usb Standby current:

How to Spot Pseudoscience on the Internet – Hackster Blog

https://blog.hackster.io/how-to-spot-pseudoscience-on-the-internet-e7d1f53796a2 There are many companies that make up some bogus pseudo scientific claims to sell products. This article gives an example about a company selling expensive stickers as solution for people afraid of the irrational “dangers of electromagnetic radiation”. The article lists the hallmarks of pseudo-scientific products for you to become a more savvy consumer.

Bluetooth 5.1 location technology demo

Last week when I visited Arrow IoT summit I saw Bluetooth location services in use.  Two booth on the even showed Bluetooth positioning in two compartments. Quuppa Oy showed their own Bluetooth-based indoor positioning technology, which is used in many applications. With its unique Angle-of-Arrival (AoA) method and positioning algorithms, the system enables real-time tracking of

POPULAR ELECTRONICS: Consumer Electronics and Experimenter magazine

https://www.americanradiohistory.com/Popular-Electronics-Guide.htm American Radio History site has Popular Electronics and a number of other 50′s-90′s electronics and computer magazines, all PDF. Includes the Experimenter’s Handbooks and several Ham Radio focused publications. There is also a Reference Book. Great collection of history for all of you that grew up with it and those that did not.

Does 5G pose health risks?| EDN

https://www.edn.com/electronics-blogs/5g-waves/4461754/Does-5G-pose-health-risks—part-1- There has been some talk about 5G and health risks that range from hardly anything to frying your brain and controlling the population. This interesting article series is exploring the health risks posed by mmWave radiation onto humans. Millimeter wave (mmWave) frequencies extend from 30 GHz to 300 GHz. From the literature, there can