STJグループ（株式会社サンテレコムジャパン、株式会社STJレンテック） List of Products and Services

An intercom is a wireless device that allows multiple people to communicate simultaneously within a specific distance. It offers different conveniences compared to radios and transceivers. It is used in various settings such as call centers, event venues, and construction sites. This article will provide a detailed explanation of the basic knowledge of intercoms, how to use them, the differences between intercoms and radios or transceivers, and the benefits of intercoms. If you are considering introducing an intercom, please use this as a reference. *For more detailed information, you can view related links. Feel free to contact us for more details.

A "radio" refers to a device used for wireless communication, which is classified into receivers and transmitters based on its functions. Devices capable of both receiving and transmitting are called "transceivers." According to Japan's Radio Law, devices intended solely for receiving are not included in this definition (as per Article 2, Item 5, proviso), and televisions and radios are excluded from the definition of a radio. Generally, the term "radio" is used directly to mean transceiver. The advantage is undoubtedly the ability to communicate from one to many, allowing for simultaneous broadcasting with the push of a button, making it suitable for information sharing. [Features] ■ Classified into receivers and transmitters based on functionality ■ Capable of one-to-many communication ■ Simultaneous broadcasting with the push of a button *For more details, please refer to the related links or feel free to contact us.

Radio frequency refers to the frequency at which radio waves are transmitted and is the fundamental mechanism of wireless communication. This article serves as the first installment in a series on the basic knowledge of radios, transceivers, and intercoms, explaining the mechanism of radio frequency, the main frequency bands of radios (transceivers), how to adjust frequencies, and key points for selection. We provide essential information that those considering the introduction of radios or looking to choose more suitable equipment should know. *For detailed content of the column, you can view it through the related links. If you are considering renting or purchasing radios, transceivers, or intercoms, please feel free to contact us.*

Before choosing a radio, transceiver, or intercom, it is important to understand the types of radios available. In this article, we will provide a detailed explanation of the types of radios, from satellite radios to specific low-power transceivers, along with their features. We will also introduce prices for purchase and rental, usage scenarios, and recommended models, so please use this information as a reference for selecting the right radio equipment for your needs. *For detailed content of the column, you can view it through the related links. For more information, please feel free to download the PDF or contact us.

There are various types of radios, intercoms, and transceivers, each with different uses and functions, but they are all wireless devices that utilize radio waves for voice communication. When actually using them, communication distance is particularly important. However, did you know that this communication distance can vary greatly depending on the model and the environment in which it is used? In this article, we will explain the basic knowledge of radios, intercoms, and transceivers, as well as the differences in communication distance and methods to extend that distance. We will also introduce recommended models based on distance, so please read until the end. *You can view the detailed content of the article through the related links. For more information, please feel free to contact us.

Transceivers (radio devices, intercoms) are convenient communication tools that are active in various situations such as construction sites and event venues. In this article, we will introduce the knowledge you should know before using transceivers (radio devices, intercoms), basic usage, examples of use, and tips for speaking. Please use this article as a reference to utilize transceivers more effectively and achieve a more comfortable communication environment. *For detailed content of the article, you can view it through the related links. For more information, please feel free to contact us.

The protection against dust and water for radio equipment is standardized, and the protection class is indicated by the IP (Ingress Protection) rating defined by the IEC (International Electrotechnical Commission) standards. The IP rating is displayed as IP followed by two digits, where the first digit and the second digit represent the degree of protection. The first characteristic digit indicates dust protection performance, while the second characteristic digit indicates water protection performance. Additionally, there are certification systems for explosion-proof standards, including the international IECEx standard, but in Japan, products cannot be used solely based on obtaining international standards; they must also have obtained a type approval certificate. 【Features】 ■ Dust protection performance is rated from 0 to 6, with higher numbers indicating better performance. ■ Water protection performance is rated from 0 to 8, with higher numbers indicating better performance. *For more details, please refer to the related links or feel free to contact us.

Are you troubled by dead zones in wireless communication or insufficient communication range? A "wireless repeater" is an important tool for improving the communication range of transceivers and radios. Clear communication can be achieved even in areas where radio waves are difficult to reach, large sites, or facilities with different levels, through the use of a repeater. In this article, we will thoroughly explain the basic mechanism of wireless repeaters, the benefits and precautions of their introduction, and how to choose one. We will also introduce our top three recommended wireless repeaters for licensed stations, so please be sure to read to the end. *For detailed content of the column, you can view it through the related links. For more information, please download the PDF or feel free to contact us.

Applications for radio licenses can be mainly divided into three categories. 1. "License Application" for applying for a license for new equipment. 2. "License Renewal Application" for continuing to use an already issued license beyond its expiration date. 3. "Modification Application" for making changes to the information listed on the license. When introducing or adding new radio equipment, it is necessary to notify the Ministry of Internal Affairs and Communications and obtain a license if you have purchased new radio equipment. Our company handles proxy applications for license applications. Please feel free to consult us when needed. 【Types of Applications】 ■ License Application ■ License Renewal Application ■ Modification Application *For more details, please refer to the related links or feel free to contact us.

The Radio Law regulates the use of wireless communication within Japan, aiming for the proper use of radio waves and the prevention of interference. It was partially amended in 2005, strengthening the regulation of wireless equipment. The law stipulates the appropriate use of frequencies for wireless communication, a licensing system, prevention of radio interference, and protection of communication privacy. This article provides an easy-to-understand introduction to the basics, objectives, regulations, and obtaining licenses or amplifications related to the Radio Law. Please read through to the end. *For detailed content of the column, you can view it through the related links. For more information, feel free to contact us.*

The importance of communication is increasingly rising, and radios, transceivers, and intercoms (hereafter referred to as radios) are essential tools in modern business. Even though there are many types of radios, you may come across unfamiliar terms, or you might have a general understanding but lack detailed knowledge, which is quite common. This glossary has been created to explain the complex words and concepts related to radio communication in a simple and clear manner. It summarizes the terms related to the types, management, and operation of radios, and I hope it will be helpful to you. *For detailed content of the article, you can view it through the related links. Please feel free to contact us for more information.*

This article explains the amendments made in the fiscal year 2023 regarding the increase in power for digital simple radio stations. The purpose of the power increase is to alleviate areas where radio waves were congested and difficult to use due to location and time. It also explains precautions when using the increased power simple radio. *For detailed content of the article, you can view it through the related links. Please feel free to contact us for more information.

The frequency of digital simple radio equipment (registered stations, licensed stations) has been increased. In this column, we will summarize the key points after the changes. On September 8, 2023, the frequency for digital methods in the 350MHz and 460MHz bands was expanded for simple radio stations. Additionally, remote use and relaying have also become possible. For information on the legal revisions, please refer to the Ministry of Internal Affairs and Communications website. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.

Digital simple radio refers to a type of simple business radio that transmits using digital signals. Compared to traditional analog systems, it features clearer audio and less noise. It helps improve the efficiency of business communications and enhance safety. This article will explain the basics of digital simple radio, the differences between licensed and registered stations, the digitization of radios, and the increase in channels. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.

Have you ever felt that when using a radio (transceiver or intercom), sometimes "another voice mixes in" or "you can't hear the other person's voice"? The cause may be "interference." In this article, we will introduce the main causes of interference, specific countermeasures, and recommend digital simple radios for interference prevention. Please refer to this when using radios. *For detailed content of the column, you can view it through the related links. For more information, please download the PDF or feel free to contact us.

A business radio is a communication device used for business communications, emergency information transmission, and on-site instructions. To improve operational efficiency and safety, they are actively used in various settings such as construction sites, security, transportation, and event management. This article will provide detailed explanations of the basic knowledge, types, selection criteria, and 15 recommended models of business radios based on distance. We will provide information to help you find the suitable radio to enhance efficiency in your operations. *For detailed content of the column, you can view it through the related links. For more information, please download the PDF or feel free to contact us.*

MCA wireless has been an essential communication infrastructure that enables stable calls nationwide in Japan, playing a crucial role as a business communication system for disaster prevention and infrastructure development as part of BCP measures. However, it is currently heading towards service termination, making it urgent for companies and local governments to consider alternative options. This article will provide a detailed explanation of the features and mechanisms of MCA wireless, its advantages and points to note, as well as measures to take in response to the impending service termination. *For more detailed content of the column, please refer to the PDF. For further inquiries, feel free to contact us.*

IP radios are wireless devices that use mobile phone communication networks or internet connections to make calls. Unlike conventional radios, they do not require a license or registration, making them easy to use. Additionally, they allow for nationwide communication in Japan, and since the call charges are flat-rate, costs can be kept low. This page will explain the communication mechanism of IP radios, their types, advantages, disadvantages, recommended models, and usage examples. *For detailed content of the article, please refer to the related links. For more information, feel free to contact us.*

Wireless radios are an essential tool for communication at events and construction sites, but have you ever felt dissatisfied with the communication range or quality? In such cases, we recommend IP radios and IP radio apps. In this article, we will introduce the differences between IP radios and mobile phones/smartphones, as well as the features, benefits, and usage of IP radio apps. Please take a look for reference. *You can view the detailed content of the article through the related links. For more information, please feel free to contact us.*

Recently, large-scale typhoons and heavy rains have been occurring continuously every year, causing significant damage. In this article, we will introduce a hybrid IP transceiver (IP700PLUS) that utilizes mobile lines for wide-area communication and a unique communication network as a digital simple radio as a BCP measure. In Japan, natural disasters caused not only by earthquakes but also by typhoons and strong winds occur every year. Recently, power outages and damage to communication infrastructure have been frequent due to intensifying typhoons. *For more details on the column, please refer to the PDF. Feel free to contact us for more information.

We would like to introduce our IP radio, the 'TLK100'. This product is cordless with Bluetooth earphones, allowing for efficient movement without being hindered by long cords. Charging is done using a USB cable, so no dedicated charger is required. Additionally, it is lighter and thinner than typical radios, reducing the burden on your waist. 【Features】 ■ Cordless with Bluetooth earphones ■ Clean hand microphone with Bluetooth ■ Lighter and thinner than typical radios ■ Usable anywhere within the area *For more details, please refer to the related links or feel free to contact us.

In recent years, with the evolution of communication infrastructure, "Wi-Fi (wireless LAN) compatible IP transceivers" have been gaining attention in addition to traditional radios. What exactly is a "Wi-Fi (wireless LAN) compatible IP transceiver"? How does it differ from conventional transceivers? This article will explain in detail the features, selection criteria, and usage scenarios of Wi-Fi transceivers. We will also introduce recommended models that are active in various settings, from event venues to construction sites and nursing facilities. If you are a company representative considering the introduction of Wi-Fi transceivers for business use, please use this as a reference. *For detailed content of the column, you can view it through the related links. For more information, please feel free to download the PDF or contact us.

In this article, a wireless vendor will explain the background behind the release of the digital simplified license bureau's repeater, how it can be used, and what issues it can actually resolve. We will also introduce usage examples based on actual usage scenarios, so please be sure to check them out. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.

The demand for using transceivers hands-free is rapidly increasing in many fields such as construction, security, food service, and event management. This article will comprehensively explain the theme of "hands-free transceivers," covering mechanisms such as VOX function, Bluetooth, simultaneous calls, compatibility by type of radio, advantages and precautions, and suitable selection methods. If you want to communicate without stopping work, please refer to this guide for choosing hands-free compatible transceivers. *For detailed content of the column, you can view it through the related links. For more information, please download the PDF or feel free to contact us.

Explosion-proof radios are designed with a special structure to ensure that they do not become an ignition source for fires or explosions when flammable gases, vapors, or dust are released into the atmosphere. These radios have passed explosion-proof standard inspections conducted by certification bodies and have received certification. They are commonly used in various factories, industrial complexes, and chemical plants. In this column, we will explain in detail what explosion-proof means and why it is necessary, starting from the basic knowledge. *For more details on the column, you can view it through the related links. Please feel free to contact us for more information.*

To conduct stable wireless communication, antennas are essential. Whether using IP transceivers, commercial radios, or specific low-power transceivers, the performance of the antenna and the installation environment greatly influence communication distance and audio quality. However, many people feel overwhelmed by the technical jargon associated with antennas, finding it difficult to understand the mechanisms or differentiate between types. This article will clearly explain the basics of wireless antennas, including their mechanisms, transmission and reception characteristics, key points for choosing the right antenna without making mistakes, and precautions during installation and operation, in a way that is easy for beginners to understand. Please read through to the end as foundational knowledge to correctly understand wireless antennas and build an appropriate communication environment. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.*

In recent years, the demand for business radios has increased as part of efforts to improve work efficiency and safety measures in the industrial sector. Radios equipped with explosion-proof features and approved by licensed stations are being used safely. This article explains how to utilize the rental of business explosion-proof radios. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.

We would like to introduce STJ Rentec's radio equipment rental service. Rental fees are charged only for the actual usage days (utilization days) of the radio equipment by the customer. The delivery date is set for the day before the actual usage day, and the return date is the day after. Additionally, we propose suitable rental methods tailored to your needs. Rentals can start from one day and can be arranged for any date you prefer. We respond quickly to maintenance needs and sudden increases in equipment. 【Rental Plans】 ■ Short-term rental ■ Long-term rental ■ Stock rental *For more details, please refer to the related links or feel free to contact us.

Summer is just around the corner, and behind the bustling fireworks festivals where many people gather, various stakeholders are collaborating to manage the event. At the heart of this operation are radios and transceivers. These tools are essential for improving the efficiency of event management by allowing instant communication. On this page, we will explain how radios and transceivers are used in the management of fireworks festivals based on past usage records, and which types of radios are most suitable. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

The season for shareholder meetings, exhibitions, and events is approaching, but are you ready with your radios? Radios are essential for smooth operations and trouble response, but with so many types available, some may be unsure about which to choose. This time, we will focus on shareholder meetings and introduce the models that received particularly positive feedback from those who have actually used rental radios. *For more detailed information, please refer to the related links. Feel free to contact us for more details.

The number of marathon events and sports competitions increases in August and September. In marathon events, staff and volunteers are spread over a wide area, so there are many situations where simply responding on-site is insufficient, and coordination is necessary. This time, we will introduce how to choose suitable models that can be used in large-scale venues like marathons, as well as in mountainous areas, by the sea, or in rainy environments, along with popular models. *For detailed content of the article, please refer to the related links. For more information, feel free to contact us.

At school events such as cultural festivals, entrance exams, and graduation ceremonies, radios and transceivers are very useful. Even at a distance, you can contact multiple people at once with the push of a button, making them invaluable for handling emergencies. In this article, we will introduce how radios and transceivers, which are essential for various school events, can be used in different situations. *For more details, you can view the related links. Please feel free to contact us for more information.*

In recent times, unprecedented disasters such as earthquakes, heavy rains, and tornadoes are occurring frequently. In disaster-prone Japan, BCP measures (Business Continuity Planning) are essential. This article explains the recommended points for radios and transceivers in BCP measures. We will clearly introduce the advantages such as more stable communication than mobile phones and group communication. Additionally, we will pick up recommended models suited for various purposes. Let's implement radios and transceivers for disaster situations and BCP measures to ensure thorough preparedness. *For detailed content of the column, you can view it through the related links. For more information, please download the PDF or feel free to contact us.*

As various events are beginning to regain their vibrancy these days, the number of exhibitions and events held in person is also increasing across different regions. In this article, we will introduce a wide range of rental achievements, including commonly used models at exhibitions, how to use wireless devices, and popular services all at once. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.

We would like to introduce our digital radio, the 'MiT5000'. This product is a licensed transceiver that contributes to the formulation of BCP (Business Continuity Plan) in care facilities and ensures the safety of users. It minimizes the impact between radios used in urban areas. It accelerates information sharing during emergencies and promotes appropriate responses. By strengthening collaboration among staff, it contributes to ensuring the safety of users. 【Features】 ■ Usable during power outages ■ Wide-range communication ■ Strengthened collaboration among staff ■ Ensured safety of users ■ Enhanced BCP formulation ■ Easy operation *For more details, please refer to the related links or feel free to contact us.

In environments where radios are used, "interference" can become an issue. This is especially true in construction sites, security operations, event venues, and logistics warehouses, where many staff members use the same radio frequency (channel). In such environments, communication can overlap, making it difficult to hear voices clearly. One of the features used to prevent these problems is carrier sense. This article will introduce the basic mechanism of the carrier sense function, its role as a countermeasure against interference, and the differences between radios with and without the carrier sense function, as well as recommend models for interference countermeasures. If you are considering renting or purchasing a radio, please use this as a reference. *For detailed content of the column (such as blogs), you can view it through the related links. For more information, please download the PDF or feel free to contact us.

In recent years, Bluetooth-enabled models of transceivers that can be used wirelessly have gained attention. By utilizing Bluetooth, earphones and headsets can also be connected wirelessly, allowing for greater freedom of movement. This eliminates the hassle of wired connections and enables comfortable communication without cords, making it useful in many settings such as construction sites and event management. In this article, we will provide a detailed explanation of the communication mechanism and benefits of Bluetooth-enabled transceivers, connection procedures, and ways to utilize them. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

There are various types of wireless communication, among which VHF and UHF are commonly heard. Both are frequency bands used in radios, but they have different characteristics and are used differently depending on the application. In this article, we will explain the differences between VHF and UHF in a way that is easy for beginners to understand, as well as key points for choosing radios based on frequency bands. If you are considering purchasing a radio, please use this as a reference. *For detailed content of the column, you can view it through the related links. For more information, please download the PDF or feel free to contact us.*

What is the radio wave usage fee? Does using a radio cost money? Do you have such questions? In this article, we will thoroughly explain the radio wave usage fees when using radios, covering everything from amateur radios to commercial radios, including fees by type and payment methods. We will comprehensively introduce information about radio wave usage fees, from the basics of the Radio Law to specific payment methods and advantageous prepayment systems. Please be sure to read to the end. *For detailed content of the column, you can view it through the related links. For more information, please download the PDF or feel free to contact us.

Wireless communication is an essential tool for business and event management. Is there a risk of "eavesdropping," where communication content can be overheard by third parties? If so, do you have questions like "What types of radios are more susceptible to eavesdropping?" This article will provide a detailed explanation of the basics of wireless eavesdropping, radios that are more prone to being intercepted, and specific countermeasures. We will also recommend portable digital simple radios with low eavesdropping risk. *For detailed content of the column, please refer to the related links. For more information, you can download the PDF or feel free to contact us.*