Yaesu_FC-902_user.pdf

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1、 ANTENNA MA TCmNG PROCEDURE IT IS STRONGLY RECOMMENDED THAT THE FOLLOWING SECTION BE READ IN ITS ENTIRETY BEFORE ANY MA TCHING OF ANTENNAS IS ATTEMPTED. WffiLE A STRAIGHTFORWARD PROCEDURE, ANTENNA MATCHING WITH A COUPLER SUCH AS THE FC-902 INVOLVES A LOGICAL PROGRESSION OF STEPS, AND FAMILIARITY WIT

2、H THE TOTALITY OF THE FOLLOWING SECTION WILL CLARIFY THE PROCEDURE IMMENSEL Y . To summarize the procedure that is followed in using the FC-902 antenna coupler to match a feedline to the transmitter, the following process takes place: 1) The proper inductance is chosen using the Band swi tch . 2) Th

3、e LOAD and TUNE controls are adjusted to secure a minimum SWR. Thses two controls should be adjusted one at a time, so as to avoid confusion as to the effect of any particular adjustment. A typical procedure to follow would be to apply power, adjust the TUNE control for minimum SWR, then adjust the

4、LOAD direction either to the right or left. Once the LOAD con- trol has been changed, the TUNE control should again be adjusted for minimum SWR; if this procedure improves the SWR, it should be con- tinued by further moving the LOAD control in the same direction, but if the initial change in the LOAD control worsens the SWR, one should try moving the LOAD control in the opposi.te direction. It will be clear to the operator when the LOAD control is being adjusted in the right direction. Figure 1 -6-