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CB specifications H to Z.IF This is not a big issue for the buyer, standards are around 10.7MHz for a 1st IF and 455KHz for the 2nd. IF rejection A higher dB figure is better. A typical figure is 60dB. Image rejection A higher dB figure is better. A typical figure is 60dB. Low power This was available on older UK sets, but is not usually important now. Modes This is the type of modulation used, which is usually set by law. FM is allowed in the UK and Europe. AM and SSB are allowed in America. Modulation modes See modes, above. Power source Mobile standard: 13.2v DC. Base radio UK standard: 240v AC. RF power attenuator See low power, above. RF power output Legal USA maximum: 4 Watts carrier, 6 Watts peak AM, 12 Watts pep SSB. Legal UK maximum: 4 Watts. Selectivity Look for at least 50dB at 10KHz (new sets should be 60dB at 10KHz). Sensitivity As long as the two sets being compared use the same measurement (SINAD or NQ) and at the same level (20dB or 10dB), then: If the signal level is in -dB, higher is better. If the signal is in microvolts (µV), lower is better. Spurious emissions The maximum figures for these are set by law, but lower levels are better. |
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Magazine
New CB and communications related magazine planned for August. We are looking for people with an interest in the subject to contribute information, news and other articles. We are also keen to hear from communications related organisations wanting the opportunity of a well targeted advertising campaign. We are looking for people to Contact page. | | |
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