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Only a few buyers of twisted pair network cable HDMI extenders pay attention to the additional features of some models. One of these features is the HDMI Loop Out from the transmitter. Let’s take a look at what this feature is and its intended use, and then decide whether it is adds the necessary value for the money. What does “HDMI Loop Out” mean? A standard twisted pair network cable HDMI extender kit includes a transmitter and a receiver. The transmitter has an HDMI input and a RJ45 port. The HDMI input can be used, for example, to connect a TV tuner. The RJ45 port is provided for the twisted pair network cable connection. The receiver has an HDMI output and an RJ45 port. The HDMI output can be used, for example, to connect a TV. The reciever’s RJ45 port is also used for the twisted pair network cable connection, just like the transmitter. The main purpose of such a kit is to provide an HDMI interface extention of up to 230 feet (the image above shows the Lenkeng LKV372AE-4.0 device...

 Wire tracing can be performed using two modes: passive and active. The passive mode can be used to trace electrical wiring that has a current going through it. The electromagnetic field of the wire can be detected with a receiver that is equipped with either an inductive sensor (if an electric current is flowing through the wire) or a capacitive sensor (if there is no electric current present in the wire). The main disadvantage of this mode is the possibility of getting strong interference from other power lines, electrical appliances, and/or metal studs. Therefore, the passive mode is very rarely used for tracing and identifying electrical wires when using professional devices. During active tracing mode, a device generates a signal that is sent through the wire at a frequency different from the primary power line frequency (50/60 Hz). In this case, the signal can be sent through either a disconnected line or a live one. Remember, conductors in the wiring cables are run in parall...

 Why you can’t connect long LED strips to the power supply? Self-loss power on the LED strip. 1. Introduction I noticed that my LED strip samples have different base thicknesses. Most samples are thin and bend easily; some are thick and hold their shape well after bending. I found only one metal in the strip base. The copper conductors transmit the power along the tape to all the LEDs. I thought that the inner conductors' different thicknesses meant different electrical characteristics. Aha! There's a lot to study here! Next, I'm talking about regular strips no more than 1/2" wide with constant voltage. Why are the conductors in the strip important? Many types of LED strips are high power to generate a lot of light (shine brightly). The more power, the more current. The conductors must be thicker and wider (cross-sectional area) to allow more current flow. Power losses will appear in the conductor, and that conductor will heat up if that area is not large enough. So le...

When purchasing a twisted-pair HDMI extender, it is useful to check if it has any additional functions. One of them is the ability to transmit the IR signal. In this article, we will look at the types of IR transmission, and explain what they are needed for and how they are implemented. Let's look at an example of two extenders: Lenkeng LKV372AE-4.0 and Lenkeng LKV676E (twisted-pair HDMI extenders up to 230 feet) 1. IR signal pass-back The Lenkeng LKV372AE-4.0 is a simple twisted-pair HDMI extender that has the additional function of sending the IR signal back. This means that we send an HDMI signal from the transmitter to the receiver (i.e. from the TV tuner to the TV) and we can send an IR signal back (i.e. from the TV to the tuner). In other words, if your TV tuner is in the living room and you want to watch TV in the bedroom, you need to lay a twisted pair from the tuner to the TV in the bedroom. Then connect an HDMI transmitter to the tuner and a receiver to the TV, as in the ...

We had another twisted-pair HDMI extender up to 230 feet for testing - Lenkeng LKV375N. This is an inexpensive extender that works on HDBaseT technology. This means it is interchangeable with equipment from other manufacturers that work on the same chips Main Features The Lenkeng LKV375N is a ready-to-use kit for transmitting HDMI signals with up to 4K@30Hz resolution over a twisted pair at a distance of up to 230 feet. Additional features include additional IR signal transmission in both directions. External view The set is packaged in a gray package. Such packaging is found in almost all professional devices. This emphasizes that "wrapping doesn’t matter, but the content does". If you open the box, you will immediately see the transmitter, receiver, and instructions. The rest of the accessories (power supply unit, IR transmitter, and IR receiver) are located under the black blister.   The transmitter and receiver are of average size for such devices and are made of quality ...

  Main Features The Lenkeng LKV372AE extender is considered basic in Lenkeng's lineup. It transmits video with a maximum resolution of 1080p at 60 Hz for a distance of up to 230 feet over a CAT6 cable. It should be noted that the cable category is based on the requirement for a 23 AWG wire cross-section. Theoretically, you can use CAT5e cable (24 AWG) and the range should be at least 130 feet. Going forward, during the tests we got more encouraging results for the range on CAT5e cable.                               External view The kit comes in a gray box without any advertising pictures. This usually suggests more professional applications, where "wrapping doesn't matter". If you open the box, you can immediately see the transmitter, the receiver, and the instructions. Additional accessories (power supplies, IR transmitter, and IR receiver) are located under the soft padding. If you open the box, you can i...