Step size tests included 1.25 kHz, 2.5 kHz, 5 kHz, 6.25 kHz, and 7.5 kHz. As expected, all frequencies in the extended ranges below 406 MHz accept only a 5 kHz step size. Those above 406 MHz accept only a 6.25 kHz step size. Sensitivity was tested in FM mode with squelch open. The signal voltages are for 20 dB quieting. Some of the extended ranges use AM predominately but it was much easier to measure the FM quieting sensitivity than to get bogged down with AM measurements. The results still provide a good relative picture of the performance to expect. Note that this is done on one PRO-93 sample. The boundary frequencies where reception stops as well as the sensitivity figures themselves will vary from unit to unit. No reception below 17 MHz 17 MHz 0.7uV 24 MHz 0.35uV 60 MHz 0.49uV 70 MHz 1.4uV 80 MHz 3.6uV 90 MHz 8.3uV 175 MHz 0.34uV 200 MHz 0.34uV 225 MHz 0.41uV 250 MHz 0.95uV 275 MHz 2.2uV 300 MHz 5.0uV 325 MHz 9.7uV 350 MHz 21uV 375 MHz 130uV 400 MHz 32uV 406 MHz 0.95uV 450 MHz 0.52uV 500 MHz 0.65uV 550 MHz 1.6uV 560 MHz 2.1uV 570 MHz 2.8uV 580 MHz 3.5uV No reception between 580 MHz and 806 MHz 806 MHz 0.54uV 1000 MHz 0.44uV The poor sensitivity at the upper end of the mil-air band (300 MHz range) is due to the front end filter in the radio. It is designed for a 225 MHz cutoff frequency. The UHF filter switches in at 406 MHz.