SG-235 Smartuner - SGC

SG-235 ManualCoupler Test Procedure ContinuedNote: The light bulb may not come on immediately if the coupler has not yetbeen tune for that frequency. The light bulb brightness is greatest when thecoupler is tuned for that frequency.RF GNDAntenna JackRF IN-OUTSG-2000 RadioSG-230 Antenna CouplerGND8.2 COUPLER CONFIGURATIONSchematic Q30102500, sheets 1 and 2, are the schematic diagrams of the antennacoupler. RF input is applied through connector J5; +13.6VDC is connectedbetween the terminals marked +12V and GND on J7, and an appropriate antennaand ground system are connected to feed through insulator and stainlesssteel stud respectively.Schematic Q3330102501 is the digital design of the antenna coupler. J4 is a connectorfor the Smartlock Pro and PTT out signal to the amplifier. J3 is for RS-232 connection to control the tuner remotely with a PC.8.3 TUNING PROCESSAn array of detector devices in the SG-235 monitors the antenna system impedance,reactance signal, and the VSWR load when RF power is applied to theunit. The computer uses the forward power detector as a check to ensure thatthe measurements made are applied RF and are not spurious levels from thedata conversion system. The SG-235 will proceed to tune only when enoughforward power is present to confirm this check.After RF is applied to the coupler, it then passes through the detector system.The detector system consists of six capacitors in shunt on the input arm of theSGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA 98005 USAP.O. Box 3526, 98009 Fax: 425-746-6384 Tel: 425- 746-6310 or 1-800-259 7331E-mail: sgc@sgcworld.com Web site: http://www.sgcworld.com51© 1998 SGC Inc