CTCSS ENCODER FOR OLD TRANSCEIVER,REPEATER,LINK,ETC.GENERATED WITH PIC MICROPROCESSOR ALL SET OF 51 STANDARD SUB TONES .SINE WAVE OUTPUT WITH AUDIO PREAMPLIFER FOR EASY FEED TO ANYWARE WITH TRIMMING OUTPUT THE SELECTION SWITCH IS DIP SWITCH.SIZE IS 3.5 X 4.6CM. FOR MORE INFORMATION PLEASE CONTACT ME. FOR MORE DETAIL'S PLEASE DOWNLOAD :ctcss.pdf