BridgeCom TX/RX Blog

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What is a duplexer and how do you tune one?

What is a duplexer and how do you tune one?

I've tuned a lot of duplexers over the years. Since we install duplexers in our repeaters and sell duplexers as part of our system packages, I often get asked about them. How do they work? What are they used for?...

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At BridgeCom Quality and Customer Service is not Lost

At BridgeCom Quality and Customer Service is not Lost

I had an interesting exchange over email with a potential customer recently. I believe it perfectly illustrates BridgeCom's commitment to quality products and industry leading customer service. Please enjoy, and if you have questions let me know.Regards,TimCustomer:Hello...Came across your page...

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International Crystal Manufacturing Going Out of Business - from ARRL

International Crystal Manufacturing Going Out of Business - from ARRL

03/10/2017

International Crystal Manufacturing (ICM) of Oklahoma City has announced that it will be going out of business, probably at the end of May. Royden Freeland Jr., W5EMH, son of the company’s founder, posted a letter this week on the ICM website. 

Radio Crystals in Box

“We will be honoring all orders that we have already taken and will be able to fill a limited amount of new orders dependent upon raw materials available,” Freeland said. “We would like to thank you for your past business. The success of ICM over the previous 66 years has been largely due to its amazing customer base.”

International Crystal produces RF control devices — quartz crystals, oscillators, QCM crystals, filters, TCXOs/VCTCXOs, and precision crystals.

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BridgeCom Systems New BCD Series Duplexers

BridgeCom Systems New BCD Series Duplexers

November 14, 2015BridgeCom Systems, IncPhone: (816)532-8451 E-Mail: tim@BridgeComSystems.comContact: Tim KingFor Immediate ReleaseIntroducing the NEW BCD Duplexers by BridgeCom Systems________________________________________________________________________BridgeCom Systems, Inc is pleased to announce the availability of the BCD line of duplexers for the amateur and commercial radio markets....

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Receiver Desense Testing by Karl Shoemaker, AK2O From Repeater-Builder.com

Receiver Desense Testing by Karl Shoemaker, AK2O From Repeater-Builder.com

Receiver desense testing by Karl Shoemaker, AK2O

Introduction

Due to the inability of certain people to communicate properly and understand all the aspects of site testing this page was created to read, compare notes and build on for the benefit of all. Human communication, comprehension and understanding problems is beyond the scope of this document, however the reader should keep these problems in mind when dealing with site issues and interfacing with other companies and government Agencies. Misunderstandings, bogus readings, log entries, technician and management diagnostics and plan of actions for problem solving are commonly mis-directed with considerable time and expense wasted in the wrong direction of efforts. This can lead to the general desensitation (pun intended) and poor attitude of the workforce in most any private company or government in the technical (repair) field around this country. Fortunately, there still is a handful of technicians that care to understand what the problem is and the proper way to solve, or at least, reduce the symptoms to an acceptable figure. If you are reading this it's most like you are in one of the latter. This is a good thing.

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Analog and DMR Talk Together

Analog and DMR Talk Together

Newsflash: The world is going digital! I know, I know, this is not really a revelation. We all carry around a smartphone, tablet or PC that communicates over digital LTE or Wifi. The two way radio is not much different...

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What is: Data Radio and Telemetry?

What is: Data Radio and Telemetry?

Radio

Radio technology – traditionally understood as the wireless broadcasting of audio signals like music and speech – has had a fresh lease of life in recent years.

In simple terms, radio technology leverages the electromagnetic radiations (EMR), which can be oscillate at desired frequency and allow trans-reception of data when attuned to the correct value. EMR waves travel at the speed of light, through any media (or even vacuum!), and may be used for either near-field or far-field communication based on the frequency specifications. In short, radio waves are just low-frequency versions of what we call “light”. Range of these EMR wave frequencies comprise a particular ‘channel’, which is precisely what the radio stations adhere to.

Commercially, the need for transmitting information over geographical distances has skyrocketed in recent years, as has the demand for radio to meet those needs. From radar, sonar, GPS navigation systems, wireless networking, and cellular data plans at industrial scale to Bluetooth technology and near-field communication (NFC) for your hand-held devices, radio is omnipresent.

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