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Tuning the antenna.About tuning antennas. All antennas should be tuned for the frequencies they are to be used on. This includes antennas used for receivers. The main reasons for tuning the antenna are: 1. Performance. The antenna will only perform at its best if it is correctly tuned. 2. With transmitters such as CBs, incorrect tuning can cause damage to the transmitter output. 3. Transmitting on a poorly tuned antenna may also cause interference to TV, radio, etc. Antennas for receivers usually come pre-tuned but this is not the case with CB antennas. Tuning a CB antenna is usually just a matter of adjusting the length for the lowest SWR reading.
* Meter - to see the reading. * FWD/SWR (or SWR/REF) switch - to switch mode. * Calibrate control - to adjust the meter for the amount of power used. * FS function - To measure the strength of the signal from your antenna. * antenna - for taking field strength readings. * Power meter function - To measure radio output. Some are not necessary for SWR measurement or tuning the antenna, but may be handy functions for the more advanced CBer. Connecting the SWR meter. On the back of the SWR meter, there will be two sockets (known as SO239 connectors). One of these should be connected to the CB radio, and the other to the antenna. The sockets should be marked up to show which one goes where. Connecting these the wrong way will not damage any of the equipment, but the FWD and REF switch functions will be swapped (FWD will read as REF and vice-versa). The best position to place the meter is close to the antenna, with a short lead from the meter to the antenna. However, this may be inconvenient, so the alternative is a short lead from the radio, with the main coax running from the meter to the antenna. As the meter uses the power coming from the CB to take the measurements, an additional power supply is not needed for SWR readings. |
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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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