How does intermod differ with different radios?
Handhelds A handheld radio usually operates properly with a rubber duck antenna, but when it is connected to a mobile or base antenna, the HT becomes susceptible to intermod. This happens because some of the signals become strong enough to drive the RF amplifier non-linear. DCI filters allow you to benefit from the gain of a high performance antenna without creating an intermod problem. Mobiles Mobile radios have better intermod immunity than handhelds, but if the signals are strong enough, mobiles too will be susceptible to intermod. Whether or not this happens depends on the radio, and the strength and frequency of the signals. Some metropolitan areas have so many strong signals that most VHF/UHF amateur transceivers experience intermod. The DCI filters are very effective in reducing intermod in high RF environments. Base Stations or Repeaters In many situations, a DCI filter will increase the sensitivity of a base station or repeater, particularly when using a low-noise preamp. The
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