2012年4月7日星期六

How to adjust a car CB Radio Antenna

How to adjust CB Radio Antenna

Oem Car Gps here will give you a detailed step-by-step instruction on how to tune a CB radio antenna in order that you can receive the best signal. After the total successful adjustment, it seems to me like a champion. Reaching out nearly 40 miles while on the interstate roads last week, I just yanked it off of the net and made use of it. We write this passage in the hope that it will help you get ready for the next journey.

Your CB/Ham Field-Strength SWR Meter can assist you in your cb radio antenna tuning so as to provide you with the best performance.
When the impedance of antenna system closely matches the output impedance of transmitter, amateur radio systems and CB work best. The more closely is, the better amateur radio systems and CB will work. The meter's standing wave ratio function, which is also called SWR, helps you trim your antenna to the precise length you need so that you can get the maximum transmitted power. Besides, the meter's field strength function helps you put your antenna in the right place so as to have the best coverage and decide the effectiveness of changes you make to your antenna cable, antenna, and transmitter.
Measure SWR. 
Measuring SWR informs you how much of your radio's transmit power is reflected from the antenna back into the antenna cable with generation of heat and wasting power. According to this information, for the maximum power antenna or antenna cable are able to generate, you can adjust the length of your antenna or antenna cable.
Connect the Meter
Coaxial cable (50 ohm such as rg-8x) with a PL-259 connector on both ends is needed so as to connect this meter to your antenna or amateur radio and your CB. Keep in mind that the cable must reach from the back of the meter to your radio's antenna jack.
Now do the following steps to make a connection between the meter and your radio and antenna.
1. Turn off your radio. Then disconnect the antenna from the radio and plug it into ANTENNA on the back of the meter.
2. Connect the coaxial cable and the radio's antenna jack and to TRANSMITTER on the back of the meter.
Calibrate the meter/ measure SWR
1. Set CALIBRATION switch on the front of the meter to FWD.
2. Turn on your radio. Then select a channel or frequency on your transmitter and hold down the transmit key. Do not speak into the microphone. Attention: With the different channels or frequencies, an SWR reading will be various. Choose the channel, when you transmit on one channel more often then any other. When transmitting on several channels, select a frequency in the middle of the range of channels you use. But don’t choose any of the models and use AM for SWR measurements only, when you use a CB that has sideboard modes (SSB). Select CW or tuning mode for the examination of the SWR, when you have an amateur radio.
3. Rotate the knob of the meter until the needle points to CAL while holding down the transmit key
4. Release the transmit key, then set CALIBRATION switch to REF.
5. Press the transmit key again. After that, read the SWR by noticing the position of the needle on the upper SWR scale. A meter reading of 1 on the upper scale is perfect. The figure shown between the upper and lower scales on the meter (% REF POWER) tells the percentage of power that is wasted through reflection of the signal from the antenna back into the antenna cable. For example, an SWR reading of 1.5 also indicated that 4% of your signal power is wasted. However, 96% of the radio power is more than enough for almost all applications.
6. Repeat Steps 1-5 for each channel or frequency you want to get an SWR reading for.
After browsing through the passage, you may have a general understanding of how to tune a CB radio antenna. If you have any questions, let me know!

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