Icom IC-775DSP [42/67] Antenna tuner operation

Содержание

4 FUNCTION OPERATIONS Antenna tuner operation The internal automatic antenna tuner matches the transceiver to the connected antenna automatically Once the tuner matches an antenna the variable capacitor angles are memorized as a preset point for each frequency range 100 kHz steps Therefore when you change the frequency range the variable capacitors are automatically preset to the memorized point TUNER OPERATION CAUTION NEVER transmit with the tuner ON when no antenna is connected This will damage the transceiver Be careful of the ANT switch selection Push TUNER Push the TUNER switch to turn the internal anten na tuner ON The antenna is tuned automatically when the antenna SWR is higher than 1 5 1 When the tuner is ON the TUNER switch lights MANUAL TUNING During SSB operation at low voice levels the inter nal tuner may not be tuned correctly In such cases manual tuning is helpful Push the TUNER switch for 2 sec to start manual tuning Push TUNER for 2 sec CW mode is selected a side tone is emitted and TUNER blinks then the previous mode is selected If the tuner cannot reduce the SWR to less than 1 5 1 after 20 sec of tuning the TUNER switch indicator goes out Check the following in this case the ANT switch selection the antenna connection and feedline the antenna SWR p 36 AUTOMATIC TUNER START If you want to turn OFF the tuner under conditions of VSWR 1 5 1 or less use automatic tune on and turn the tuner OFF ANTENNA TUNER OF THE IC 4KL or IC 2KL IC AT500 When using an external antenna tuner such as the IC 4KL s tuner or IC AT500 with a linear amplifier tune with the external antenna tuner while the internal tuner is turned OFF After tuning is com pleted turn the internal tuner ON Otherwise both tuners tune simultaneously and correct tuning may not be obtained 39 See p 46 item 9 for turning the function ON and OFF See the instruction manual included with each antenna tuner for their respective operations