YOA-090 Portable Broadband Omnidirectional Antenna

The case for the YOA-090 is the stretch from 150 MHz to 850 MHz. Monitoring below 400 MHz is what forces this model rather than the YOA-080. What the coverage costs is match: typical VSWR runs from 4.0 to 12.0 across that lower band. Mismatch loss there is large and moves with frequency, so no single correction figure will do. Read levels through the antenna factor curve point by point, or the low end reads low. From 850 MHz to 9 GHz typical VSWR settles below 2.5 and the antenna behaves conventionally. Gain is 3 dBi typical, linearly polarised and omnidirectional in the horizontal plane.

Weight, Power and Acceptance

At a weight of 70 g in a 197 × 62 × 17 mm body this is a handheld or tripod antenna, not a clip-on whip. Keep transmit drive under the 10 W maximum input power rating and the antenna inside its -20 to 50 °C operating temperature. On arrival, sweep the SMA (M) port on an analyser with 50 Ω impedance and check that the 850 MHz breakpoint in typical VSWR sits where the specification puts it. That breakpoint, not the band edges, is what defines this antenna.