Author: Mr.Han

Overview As Christmas approaches, we must deliver the products today. Due to an increasing number of parts suppliers ceasing production, our delivery cycle has become longer. Our American customers have been waiting for almost a month, and we sincerely apologize for the delay. However, we are pleased to announce that we quickly found a solution. […]

Overview This came from a custom request from an Indian client, We need to provide samples of both frequency bands with 117MHz and 137MHz as usual. We got a picture： We need to make it according to the above standards. The tables in the picture and the very strict parameters caused us trouble at first, […]

Choosing a duplexer for a GMRS (General Mobile Radio Service) repeater is vital to ensure the repeater functions correctly, as it allows for simultaneous transmission and reception without interference. Here are the considerations: If you want a good filter duplexer It’s a good idea to either hire a professional or use the appropriate test equipment […]

In radio communications, a duplexer is used in repeaters to allow for simultaneous transmission and reception of signals without interference between the two. In the VHF 136-174MHz range, such duplexers play a crucial role, especially when dealing with narrow bandwidths like 1MHz. VHF P25 Repeater When you have a repeater operating within the VHF 136-174MHz […]

Ham Radio is a powerful communication tool allowing long-distance contact. Whether it’s a mobile setup in your vehicle, a powerful handheld unit akin to a walkie-talkie, or a stationary home setup, Ham Radio offers versatility. Enthusiasts might climb mountains, establish battery-powered stations, and test their reach. In remote areas or during emergencies, when other communication […]

A duplexer in a GMRS (General Mobile Radio Service) repeater serves a critical role, allowing the repeater to transmit and receive signals simultaneously using a single antenna. Here’s a simplified breakdown of how a duplexer works in this context: Receiving: When the repeater receives a signal, the duplexer routes the received signal from the antenna to […]

It’s a VHF 6 Cavity Duplexer The duplexer for the 462.675 GMRS repeater is a Xinlun 6-cavity Res-Lok duplexer! The 6-cavity Res-Lok duplexer offers a 1 MHz pass band and a reject notch for a 5 MHz frequency separation. Operating in the 406-512 MHz frequency band, it provides typical minimum isolation of 85 dB at […]

Some things are worth taking the time to figure out… Just like:

Obtaining a GMRS (General Mobile Radio Service) license in the U.S. requires following specific application procedures set forth by the Federal Communications Commission (FCC). Here’s a step-by-step guide based on the FCC’s requirements as of my last update in September 2021:

A GMRS duplexer for repeaters, designed to separate the transmit (Tx) and receive (Rx) signals