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Dayton Hamvention 2017 Reflection

Dayton Hamvention 2017 Reflection

What can I say about Dayton Hamvention 2017 other than WOW! It had everything; Great venue, 30,000 of your favorite ham radio friends, great vendors, Rain, Rain, and more Rain, good food, great buys, mud and on-site camping. Did I...

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Press Release: BCM-144 & BCM-440 Mobile Radios

Press Release: BCM-144 & BCM-440 Mobile Radios

April 24, 2017BridgeCom Systems, IncPhone: (816)532-8451 E-Mail: tim@BridgeComSystems.comContact: Tim KingPress Release: NEW BCM-144 & BCM-440 Mobile Radios Now Shipping________________________________________________________________________BridgeCom Systems, Inc is pleased to announce the availability of BCM-144 and BCM-440 Mobile Radio for the amateur radio market. The join...

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Amateur Radio Linking Explained

Amateur Radio Linking Explained

Amateur Linking What is amateur radio linking and why is it so important, necessary, or just plain fun? Let's say you want to set up a repeater at Hamvention and talk to the group back home. How is that possible?...

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K1PQ Repeater 70cm Install and Club

K1PQ Repeater 70cm Install and Club

Hello BridgeCom, Our original 444.950 repeater was an old Motorola unit setup and operated by N1BUG. It worked but required too much time and attention. Our club voted to continue operations on 444.950 so we bought the BridgeCom and now...

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BridgeCom Systems D-500 70 cm DMR and Analog Handheld Transceiver by QST

BridgeCom Systems D-500 70 cm DMR and Analog Handheld Transceiver by QST

Reviewed by Pascal Villeneuve, VA2PV
va2pv@arrl.net

D-500 Amateur DMR HTIn the past few years, VHF/UHF digital voice communication has been one of the fastest growing segments of Amateur Radio. D-STAR and System Fusion (C4FM) were specifically designed for Amateur Radio, but this is not the case with DMR — Digital Mobile Radio. It is an open standard, developed by the European Telecommunications Standards Institute (ETSI). As such, this technology is available to any company willing to build a digital radio, such as the BridgeCom Systems D-500 (by TEKK) reviewed this month. Introduction to DMR There are three types of DMR — Tier I, Tier II, and Tier III. To learn more about DMR, I strongly suggest that you read “Introduction to Digital Mobile Radio (DMR)” by John S. Burningham, W2XAB, in the October 2015 issue of QST. In this review, we will concentrate on the widespread Tier II DMR network. You will need to understand a bit about this technology to program your DMR radio. As DMR was not developed specifically for Amateur Radio, the terms are different from what we are used to. Tier II DMR uses TDMA (Time Division Multiple Access), which is a frequency-sharing protocol. You can have two conversations on the same frequency without interfering with each other. This is very efficient, as Tier II TDMA uses a 12.5 kHz bandwidth with two time slots. The switching is very fast, thus allowing for two simultaneous contacts on the same frequency, using this time-sharing method.

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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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