39OTHER FUNCTIONS6 Duplex operationDuplex communication uses 2 different frequencies for trans-mitting and receiving. Generally, duplex is used in communi-cation through a repeater, some utility communications, etc.During duplex operation, the transmit station frequency isshifted from the receive station frequency by the offset fre-quency. Repeater information (offset frequency and shift di-rection) can be programmed into memory channels. (p. ??)qSet the receive frequency (repeater output frequency).tRight-click [DUP] to display the offset frequency settingscreen.ySet the desired offset frequency within 0.000000–1000.000000 MHz range, then click [OK].wLeft-click [DUP] to set the duplex direction from OFF (noindication,) DUP–, or DUP+.eClick [MONI] to monitor the transmit station frequency (re-peater input frequency).The displayed frequency shifts the offset frequency whenmonitor function is in use. IF filter selectionIncreasing or decreasing the width of incoming signals canhelp eliminate interference. Available filters vary according tothe receive mode. See the table below.K: Available; –: Not available➥ Click the [WIDE] or [NAR] buttons to toggle between filterwidths. Attenuator functionStrong signals (such as from broadcast stations, pocket beep-ers, nearby amateur radio stations, etc.) can cause distortionof receive signals. The attenuator function can reduce signalstrength of interfering signals by approx. 20 dB.➥ Click [ATT] to turn the ATT (Attenuator) function ON orOFF.• “ATT” appears when the ATT function is turned ON.2.8 kHz 6 kHzIF filter 15 kHz 50 kHzKAM K —K K230 kHzKUSB/LSB K — — ——FM K K K —KCW K — ———WFM — — KK