Uncategorized 12 - CB World Informer

Cobra/Uniden SSB Chassis Mod UPDATE

This is a correction of the article in last months issue. The value for R131 was omitted. I’ve added arrows to the drawing for the three resistors that change the value for quicker identification. Reference shaded areas to the right REMOVE R166 ADD 8.2K from the emitter of TR26 to 8 volts constant CHANGE R131 […]

Wilson Does Comparison Test – Trucker 5000 vs. Open Coil Type Antennas

Recently I spoke with Jim Wilson and he told me that Wilson Antenna is in the process of doing comparison tests between their Truck 5000 antenna and open coil as well as other trucker style antennas. They have been and will be testing the “Q” of the coil in these antennas. He tells me that […]

Channel Board For Cobra 146GTL & Amp; Uniden PC-122XL

The Cobra 146GTL and Uniden PC- 122XL are low-cost AM/S SB radios using a gPD2824 PLL chip. The Uniden PC-122XL is the same radio as the PC-122. They changed to the XL series when they went to the Cobra look front panels. Uniden also made the PRO-810e, a base radio with the same board as […]

Cobra 2000/148 & Uniden Grant XL ALC & AM Modulation Modification

Half of the following modification increases the AM modulation swing. It allows you to reduce your carrier to around 1 Watt while maintaining a swing of up to 18 Watts. This is good for those of you who want to blast out on AM. This will also drive any amplifier to sound like an RF […]

MODERN COAXIAL LIGHTNING ARRESTORS: POLYPHASER VS. I.C.E.

This is a comparison report between coaxial cable lightning arrestor units manufactured by Polyphaser Corp. and Industrial Communication Engineers, Ltd. Both companies manufacture a wide variety of such protective devices and are sold worldwide. Each of the designs described in this report is protected. by patents issued by the U.S.- Bureau of Patents and Trademarks […]

CBWI February 1997 GROUNDING COAXIAL CABLE SHIELDS

Grounding Coaxial Cable Shields: Why, Where & How

Even today it’s a controversial subject – but we don’t know why. The purpose and importance of grounding coaxial line shields are so critical to safe and clean telecommunication station operation that it should not be a matter of discussion, except as a how-to subject such as this paper represents. The coaxial cable used in […]

RCI 6900F TB ALC Mod, Tune-Up, And PCB Adjustment Locations

The ALC modification requires the removal of surface mount parts and the addition of conventional through-hole type parts. When removing these components, take extra care not to overheat the circuit board. The traces will lift quite easily. When installing standard components, due to their larger size, it’s best to solder them to the trace where […]

CB World Informer December 1996 Issue

The Midland 79-290 is the smallest sideband mobile available today. It measures only 2″ high by 6.25″ wide by 7″ deep. The small size combined with the detachable face makes it possible to safely mount it permanently in many vehicles. This is a new generation of CB radio designed and manufactured in Korea. Instead of […]

Cobra XL 450 Linear Amplifier From Mexico

This is the other unit that my customer brought in for test. The heatsink and front panel layout looks very familiar. It is a copy of the old Palomar Magnum linear amplifier. The Palomar folks no longer use the Palomar name or produce linear amplifiers since they were busted many years ago. They managed to […]

Frequency Conversion For Galaxy DX 2547 – Channel Mods

Before you start, make sure the radio isn’t connected to a power source! This is a 4 position rotary switch conversion Reference Picture Below 1. Remove the radio covers, all knobs, and front bezel. 2. Remove the headphone jack from the front panel and leave wired. 3. Heat shrink headphone jack and secure to inside of chassis with double […]

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