Cobra 2000

Posts Tagged ‘Cobra CB Radio’

Keeping CB Radios Alive

Friday, January 28th, 2011

Since 1959, when the Class "D" Citizen Band was allocated, The evolution of CB has gone through many changes. Built in the USA, tube radios were expensive, yet simple. With only 23 Channels controlled by using a number of crystals, these early radios provided a hobby for some, and an emergency back up communication system to many U.S. citizens.

As technology improved, and the cost reduced, the CB grew into a booming industry. CB radio has developed into a low cost, and still effective, means of communication that has survived for 50 years. (more...)

New Generation of Illegal CB Radio

Sunday, July 5th, 2009

There is a new generation of illegal radios for sale. These are basically the Export Galaxy and Connex 3300 radios with linear finals installed internally, eliminating the need for external linear amplifiers. They come in a number of different power ranges, from 45 watts to 400 watts.

I wish to note for a number of reasons I do not exceed the power limit or talk out of band. The fines do not warrant getting out for the sake of being the “Loudest” radio. FCC regulations are specific as to power limitations and talking out of band, known as “Free Banding”.

Second, radios waves at 27 MHz with 400 watts behind it are dangerous; this may include RF burns, and damage to other radio land mobile services. Although the jury is still out on long term exposure to radio waves, it is suggested to cause cancer. A Microwave oven operates at 6 GHz at 600 watts; I would not suggest putting your hand in it.

Having stated that, I can tell you there are a number of people out there talking in between the CB and 10 meter Ham band. They usually operate at a reasonable output power and use SSB, mostly USB. By not disturbing their neighbors they do not bring attention to themselves. Many are Ham operators that come down below their band to chat with Cb’ers that go above their band.

The easiest way to spot an export radio is they have no Type-Accepted plate mounted on the back. Any radio that has a built in echo, extended channel capability and has the ability to be easily converted is unauthorized. All are designed to do 24 to 35 watts and up to 400 watts at the time of this newsletter. I suspect that the next generation will put out more power.

I have found that out of all the “Exports” the Connex, the General Lee and General Washington is the most durable and will provide the best service. The Galaxy radio is basically the same radio but I have found that it seem to have a higher break down rate. The Galaxy 88 seems to have cold solder connection problems and require the boards to be reworked more than the other Exports.

Galaxy now makes a legal radio, the model DX 959, mobile and the DX 969 base. They perform poorly out of the box, with most doing far less than the legal limit of 12 watts peak. Most are off frequency.

After reworking the radio I have found that most will do 14 to 24 watts and can be converted for use on the 10 meter band which is legal with a Ham license. Any radio that does not meet the FCC Type-Accepted standards is unauthorized, this includes legal radios. When may a radio exceed 100% modulation and power limits; only in a Dire Emergency. Unless you are in your car upside down in a ditch with only your Mic finger working I would say 99.9% of time you are expected to operate within the limits.

Antennas

Tuesday, March 31st, 2009

Whether you are mobile or running a base there are three parts to the antenna system. The first part is the antenna itself. A good antenna should last you 10 years or more. Ultra violet light and moisture is the most common failure. The second part is the mounting hardware. This is subject to moisture and wind and should be checked periodically.

Only stainless steel bolts and mounting brackets should be used to minimize rust. The third part is the coaxial cable. This part of the system is the first to wear out; it is exposed to wind, rain and most importantly ultra violet light. If the coax is easily replaceable any good RG58 or RG8 coax less than 100 feet with 95% shielding will work.

If you never want to touch the coax again and you would like to bury it or not have it wear out, then you need to purchase RG213, it is expensive at $2 a foot but will last the lifetime of the antenna system. (more...)