Will the UA864US antenna operate if 12Vdc bias is not supplied?
The UA864 antenna will work without 12V dc bias in the 0, -10, and -20 switch positions; note that the LED gain setting indicators will not illuminate.
12Vdc bias is required for the +10 dB setting.
Recommended practice is to provide 12Vdc bias as this enables the UA864 LED indicators.
Upon installation, set the gain to - 20. If the system works properly, leave at this setting. Too little gain is better than too much gain.