





            
            FSK/Tone Decoder:
            =================
            The FSK/Tone decoder that I use to interface the HF radio
            to the computer is a kit called the "RADFAX DECODER".
            This kit is available from JAYCAR Electronics. The
            Catalog number is KC-5059 and the cost is $44.95. You
            will also have to buy connectors and cable suitable for
            connecting the "RADFAX DECODER" kit to your radio
            receiver and computer.
            
            A 6.5mm mono phono plug and either twin cable or coax
            cable is suitable for connecting the "RADFAX DECODER" kit
            to the headphone socket of most receivers. A 9 pin, 15
            pin or 25 pin D type (socket or plug) depending on
            whether you want to connect the kit to a Joystick port,
            Printer port, or RS232 port and some ribbon cable, or
            3or4 core shielded cable can be used to connect the kit
            to the computer.
            
            The "RADFAX DECODER" kit was decribed in "SILICON CHIP"
            magazine, November 1989 edition.
            
            RADFAX DECODER KIT ERRATA:
            ==========================
            To increase the sensitivity of the "RADFAX DECODER" omit
            the 220Kohm resistor which goes between pin 2 of the
            XR2211 chip and Ground.
            
            On the parts overlay diagram the polarity of the 100
            micro F electrolytic capacitor is reversed (incorrect).
            Check that you have the negative side (-) of the
            capacitor is connected to the middle pin of the 7805
            regulator chip.
            
            The above corrections are decribed in more detail in
            "SILICON CHIP" magazine, JUNE 1990 Edition, page 102.
            
            
            LISTENING POST KIT:
            ===================
            Another FSK/Tone  decoder that  I have  used  is a kit
            called AEM 3500, also known  as   "The Listening  Post".
            It can be purchased from "Jaycar  Electronics" (stores
            in Sydney,  Melbourne  and Brisbane), catalog number KM-
            3015 for $39.95, and from "Rod Irving Electronics",
            catalog number K33500 for $39.95.
            
            
            ADDRESSES:
            ==========
            
            
                        JAYCAR HEAD OFFICE
                        115-117 Parramatta Rd.
                        Concord NSW 2137
                        P.O. Box 185
                        Concord NSW 2137












                        Phone: (02) 747 2022
                        Mail Order Hotline: (02) 747 1888
                        Order Line: 008 022 888
            
            
            
            
                        Rod Irving Electronics
                        P.O. Box 620
                        Clayton
                        Victoria 3168
                        Inquiries  (03) 543 7877
                        Orders only TOLL FREE line 008 33 5757
            
            
            
















































