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. Intercoms are 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 advantages of intercoms. If you are considering implementing an intercom system, please use this as a reference. *For more detailed information, you can view the 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 excluded from this definition (Article 2, Item 5, proviso), meaning that televisions and radios are not included in the definition of a radio. Generally, the term "radio" is used 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 coordination. [Features] ■ Classified into receivers and transmitters based on function ■ 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, please refer to the related links. If you are considering renting or purchasing radios, transceivers, or intercoms, please feel free to contact us.*

A business radio is a communication device used for business communication, 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 provides detailed explanations of the basic knowledge, types, selection criteria, and 15 recommended models of business radios based on distance. It offers information to help you find the suitable radio to streamline operations on-site. *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.*

Before choosing a radio, transceiver, or intercom, it's important to know 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 more detailed information, you can view the related links. For further details, please download the PDF or feel free to 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 basics 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 to the end. *You can view detailed content of the article through the related links. For more information, feel free to contact us.*

Transceivers (radio equipment, 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 equipment, intercoms), basic usage, examples of use, and tips on how to speak. 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.

Applications for radio station licenses are mainly divided into three categories. The "license application" for new equipment, the "renewal application" for continuing to use an already issued license beyond its expiration date, and the "modification application" for changes to the information listed on the license. When introducing or expanding new radio equipment, it is necessary to notify the Ministry of Internal Affairs and Communications and obtain a license if you purchase new radio equipment. Our company acts as an agent for license applications. Please feel free to consult us when needed. [Types of Applications] ■ License Application ■ Renewal Application ■ Modification Application *For more details, please refer to the related links or feel free to contact us.

The protection against dust and water for wireless devices is standardized, and the protection rating is indicated by the IP code 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, it is not sufficient to only obtain international standards; products must also have passed type approval certification to be used. 【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.

This article explains the increase in power for digital simple radio stations that was revised in the 2023 fiscal year. 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 discusses precautions when using the increased power simple radio. *For detailed content of the article, you can view it through the related links. For more information, please feel free to contact us.*

The frequency of digital simple radio equipment (registered stations, licensed stations) has been expanded. 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 become possible. For information on the legal amendments, 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.

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 encounter unfamiliar terms or have a general understanding but lack detailed knowledge, which is quite common. This glossary was created to explain the complex words and concepts related to radio communication in a simple and clear manner. It summarizes the terms that come up regarding the types, management, and operation of radios, so I hope you find it helpful. *You can view the detailed content of the article through the related links. For more information, please 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 calls throughout Japan, and with a flat-rate fee structure, costs can be kept low. This page will explain the communication mechanism of IP radios, their types, advantages, disadvantages, recommended models, and use cases. *For detailed content of the article, you can view it through the related links. Please feel free to contact us for more information.*

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

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 a dedicated charger is not required. Additionally, it is lighter and thinner than typical radios, reducing the burden on your waist. 【Features】 ■ Cordless with Bluetooth earphones ■ Clean connection with Bluetooth hand microphone ■ Lighter and thinner than typical radios ■ Usable anywhere within the coverage area *For more details, please refer to the related links or 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 by typhoons and strong winds occur every year, not just earthquakes. Recently, power outages and damage to communication infrastructure have been frequent due to intensifying typhoons. *For more details on the column, you can view it in the PDF. Please feel free to contact us for more information.

MCA wireless has been an essential communication infrastructure that enables stable calls throughout Japan, playing a vital 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 detailed content of the column, please refer to the PDF. 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 of this 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.

Explosion-proof radios are designed with a special structure to ensure that they do not become an ignition source for fires or explosions, even 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 provide a detailed explanation of 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.*

In recent years, the demand for commercial radios has been increasing in the industrial sector as part of efforts to improve work efficiency and safety measures. Radios equipped with explosion-proof features and approved by licensed authorities are being used safely. This article explains how to utilize the rental of commercial 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 utilization 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 preferred date. 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 lively fireworks festivals where many people gather, various stakeholders are collaborating to manage the event. At the center of this operation are radios and transceivers. They are essential tools 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 detailed information, please refer to the related links. Feel free to contact us for more details.*

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. *You can view the detailed content of the article through the related links. For more information, please feel free to contact us.*

The number of marathon and sports events increases in August and September. In marathon events, staff and volunteers are spread over a wide area, so there are many situations where on-site responses alone are 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, and they are extremely helpful in responding to emergencies. This time, we will introduce how radios and transceivers, which are essential for various school events, can be used in different situations. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.

As various events are beginning to regain their vibrancy, 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.

The Radio Law regulates the use of radio communications within Japan and aims to ensure the proper use of radio waves and prevent interference. It was partially amended in 2005, strengthening the regulations on radio equipment. The law stipulates the proper use of frequencies for radio communications, a licensing system, prevention of radio interference, and protection of communication privacy. This article provides a clear introduction to the basics, objectives, regulations, and the process of obtaining licenses and amplifying signals under the Radio Law. Please read through to the end. *For detailed information on the column, please refer to the related links. Feel free to contact us for more details.*

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, you can view it through the related links. For more information, please feel free to contact us.

In this article, a wireless vendor will explain the background of 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. *You can view the detailed content of the column through the related links. For more information, please feel free to contact us.

Are you struggling with dead zones in wireless communication or insufficient communication range? A "wireless repeater" is an essential tool for improving the communication range of transceivers and radios. Clear communication is achievable even in areas where radio waves are hard 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.

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 compared to mobile phones and group communication. Additionally, we will highlight recommended models based on different uses. 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.*

This article explains "satellite wireless," which is essential for ensuring communication in BCP measures. In recent times, unprecedented disasters such as earthquakes, heavy rains, and tornadoes have been frequent, and you may be struggling with communication methods during such emergencies. What we are introducing this time is the IC-SAT100, a wireless device that communicates through 66 communication satellites. *You can view the detailed content of the article through the related link. For more information, please 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 of radio communications 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 to operate *For more details, please refer to the related links or feel free to contact us.

In recent years, Bluetooth-enabled models of transceivers that can be used wirelessly have been gaining 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. This article will provide a detailed explanation of the communication mechanism, benefits, connection procedures, and usage methods of Bluetooth-enabled transceivers. *For more detailed information, please refer to the related links. Feel free to contact us for more details.*

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 according to their applications. 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.*

Wireless communication is an essential tool in business and event management. Is there a risk of "interception," where communication can be overheard by third parties? If so, do you have questions like "What types of radios are more susceptible to interception?" This article will provide a detailed explanation of the basics of wireless interception, radios that are more likely to be intercepted, and specific countermeasures. We will also recommend portable digital simple radios with low interception risks. *For more detailed information, you can view the related links. For further details, 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.

"I am thinking of using my analog-only device until the very last moment." Many customers have thoughts like, "It's okay because we are using a digital-analog device at our company." However, depending on the timing of the analog signal shutdown or when you decide to upgrade, there may be a period during which you cannot use your radio equipment. To use your radio equipment comfortably, we will explain why it is better to take action early. For more details, please refer to the related links. [Contents] ■ What should you do if you are using an analog device? ■ What should you do if you are using a digital-analog device? ■ What should you do if you are unsure about the model you are using? *For more details, please refer to the PDF document or feel free to contact us.