For answers to some of your most commonly asked questions regarding K40 products, please refer to the infomation below. If your question is not answered in this section, or you require further explanation, please contact K40 customer service department by calling 1-800-228-1291
- Is Good SWR Important?
- What Causes High SWR?
- How Do I Adjust K40 Antenna SWR?
- How Important Is Grounding My Antenna
- How Important is The Coax?
- How Long Should The Coax Be?
- Are There Pre-Tuned Antennas?
- Is Power Handling Important in Antennas?
- Short Whip vs Long Whip
- Expected Transmit and Receive Distance w/K40
- Best Investment: CB or Antenna?
A high SWR reading (higher than 2:1) is a sign of reflected power (RF energy) going back to the radio. This means some of the power that is transmitting does not make it to the antenna. Besides signal loss, having a high SWR might also result in damage to the radio.
Keep in mind, while a high SWR reading is an indicator of a match problem, a good reading does not necessarily mean your antenna is radiating properly. An example of this is a dummy load. While a dummy load is able to achieve a perfect SWR it does not radiate a signal.
"No Ground Plane" antennas are also an example of this. These specialty antennas are designed to produce low SWR readings in tough grounding situations. Though their SWR match is good, their radiating pattern is very poor for mobile use. Instead of radiating towards the horizon, they tend to radiate skyward, thus limiting the distance you can transmit and receive with them.
Coax problems - Improper type, incorrect length, low quality, or damage
Poor installation location
Antenna not tuned properly to the vehicle
Damage to the antenna