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  The ARC (Audio Return Channel) function in HDMI has helped to remove unnecessary communication between TV and AV receiver, soundbar, or home theater. What does the ARC feature mean for twisted-pair HDMI extenders, and how can you use it? We will review the INRIKS EX4076E twisted-pair HDMI extender with ARC function (and other useful features). Main Features The INRIKS EX4076E extender provides a maximum 4K60Hz video transmission range of up to 230 feet over the CAT6 twisted pair. The transmitter has an additional HDMI pass-through output for connecting a local TV. The receiver has a S/PDIF digital optical audio output. The kit provides two-way IR signal transmission to control a remote TV on the transmitter side or a video source (e.g., TV receiver) on the primary TV side. External review The INRIKS EX4076E is shipped in a plain gray box. The pictograms on the label show the device's main features. Inside the box are the transmitter, receiver, and manual. The transmitter and rece

  In the previous article, we reviewed the basic parameters NEXT and FEXT. The Attenuation to Crosstalk Ratio (ACR) is used when evaluating structured cabling. This parameter is equivalent to the signal/noise parameter concerning the transient effects at the near end of the NEXT, i.e., it serves as an estimate at the receiver input for the undergone line attenuation of the signal and for noise from the transient effects at the near end. Quantitatively, ACR is expressed as a logarithmic measure of the difference between NEXT and cable attenuation. If, for example, the ACR value is 10 dB, this means that the NEXT power of the interference at the receiver input will be 10 times less than the power of the useful signal, i.e., the signal-to-noise ratio will be 10. Suppose the communication system operates in single-cable mode, and the signal levels at the outputs of the transmitters at points A and B are the same and equal to 0 dB. If the line attenuation at frequency F denotes by Ak, then

I have been interested in smart home systems, automation, and sensors for a long time. I like devices without reference to any manufacturer. So I often use the excellent Shelly Wi-Fi devices. These relays, controllers, and bulbs have an open embedded web server and are controlled via MQTT or web API. I recently made new lighting in my home lab. I used a Shelly RGBW2 controller (24 volts) for the bright white LED strip (main light) and Shelly Duo RGBW GU10 bulbs (background light). I immediately noticed discomfort in my eyes, and by evening my eyes were watery. I thought I had pinkeye, or the air in my room was dehydrated, or the street air was suddenly polluted. I agonized for two days. On the third day, I experimented with LEDs and a spectrometer for one of my future posts. I was getting extraordinary results. During one of the experiments, I pointed the spectrometer at my illuminating LED strip in the lab for comparison with samples. Bingo! I saw a scary pattern of light ripples. I a

You must connect multiple video sources to a TV with only one HDMI input. Switching the HDMI cable is inconvenient and causes wear and tear on the TV connector and its repair. Instead, your best choice is to buy an HDMI switcher. This device usually has several HDMI inputs and one HDMI output. You can switch sources using the buttons on the front panel or with an IR remote control. Some switchers have an RS-232 port for connecting external control systems. When looking for an HDMI switch in stores, you may find a more advanced device, the multi-switch, which costs a bit more. What is it? Is it a good buy? Let's find out. HDMI switch. General view What is an HDMI switch, and how does it work, using the INRIKS SW4031 (analog is Lenkeng LKV301-V2.0) as an example? The device has 3 HDMI inputs for connecting video sources (laptop, TV set-top box, video recorder, etc.) and 1 HDMI output for connecting a monitor / TV / projector. The maximum resolution is 4k@60fps. The device is shipped