Why is a Resistor Required for an LED?
A current limiting resistor is used in series with a Light Emitting Diode (LED). In this post we will explain why we need this resistor. LED Current and Voltage Specifications …
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How to Improve Return Loss or VSWR
In this post we show a simple technique to improve the return loss [1] of an RF component like a mixer or amplifier. A good VSWR to aim for is …
TRP vs EIRP
Total radiated power (TRP) is the total power radiated by an antenna. It is a function of the output power from the transmitter and the antenna efficiency. As the antenna …
What is the Arduino ADC Sampling Rate?
The maximum sampling rate or speed of the Arduino’s Analog-to-Digital converter is 15 kilo-samples per second or 15,000 samples per second. In this post we get into the details – …
LMR-600 vs LMR-400 RF Cable
LMR cables are manufactured by Times Microwave [1]. In this post we explore the differences between the two. Contents1 Cable Loss2 Cable Thickness3 Mechanical Specifications4 Cost5 Summary6 References Cable Loss …
Roku RSSI vs SNR – What do they mean?
When you go to your Roku Wireless Secret Screen, you will see a number of parameters on display. The picture below shows that the Roku system is connected to channel …
MT7921 vs AX210
Both MediaTek MT7921 and Intel AX210 are Wi-Fi and Bluetooth combination cards. In this post we compare the main differences between the two products and look at some real world …
TP-Link UB400 vs UB500 – what’s the difference?
The UB400 is a very popular Bluetooth Adapter. It’s a tiny USB device that plugs into your laptop and provides connectivity when your laptop doesn’t have built-in Bluetooth. The UB400 …
Ring RSSI – what does it mean?
In this post, we discuss RSSI (Received Signal Strength Indicator) and what it means for a Ring device. Contents1 What is RSSI?2 What is a good RSSI level for Ring?3 …
Does a Helium Miner Need Wi-Fi?
Yes, a Helium miner needs Wi-Fi to connect to the Internet. A miner can also be connected to the Internet using Ethernet. The miner needs a continuous, un-interrupted connection to …