‰ NOW 40 WPM ‰ TEXT IS FROM JULY 2007 QST PAGES 38, 39 AND 74 ‰ NEW HARDWARE HAS BEEN FOUND AND MAY ASK IF YOU WANT TO SEARCH FOR THE BEST DRIVER. CLICK YES AND THE COMPUTER SHOULD FIND THE PROPER DRIVER AND INSTALL IT. IF YOU ARE RUNNING WINDOWS XP OR VISTA ALL THIS WILL PROBABLY HAPPEN WITHOUT YOUR HAVING TO DO ANYTHIN ‰ FROM PAGE 74 ‰ GREEN CO KC9YI 45 JEFFERSON CO KC9IKI 41 CHIPPEWA CO W9CVA 32 PRICE CO AG9G SMALL THAT I WAS SURE THAT THE WRONG ENCLOSURE HAD BEEN SHIPPED TO ME WHEN IT ARRIVED. THE ENCLOSURE IS MADE BY LMB AND MEASURES 4 X 2 1/4 X 1 1/4 INCHES. MY IMPLEMENTATION OF THE INTERFACE UNIT HAS THE USB JACK ON THE FRONT OF THE UNIT AND THE PADDLE AND KEYING JACKS ON THE REAR. IF A WIDER ENCLOSURE IS USED, ALL JACKS COULD BE ON THE REAR PANEL. MY FIRST INTERFACE CIRCUIT WAS CONSTRUCTED ON A 2 X 2 3/4 INCH SECTION OF VERO BOARD. THE INTERFACE UNIT SHOWN USES A PRINTED CIRCUIT PC BOARD THAT MEASURES 1R6 X 1R8 INCHES. THE USB JACK AND THE ONLINE LED ARE MOUNTED ON THE PC BOARD AS WELL, BUT NOTE THAT THE LED IS MOUNTED ON THE BOTTOM OF THE BOARD. A PC BOARD IS INCLUDED IN THE PARTS PACKAGE, ALONG WITH ALL THE PARTS NEEDED TO CONSTRUCT THE INTERFACE UNIT. VERO BOARD WORKS WELL AND IS ANOTHER OPTION FOR ONE TIME PROJECTS SUCH AS THIS. THE BOARD HAS A RECTANGULAR GRID OF HOLES SPACED 0R1 INCH APART AND CONDUCTING COPPER FOIL STRIPS CENTERED ON THE HOLES, RUNNING IN ONE DIRECTION. WITH THE COPPER ‰ FROM PAGE 74 ‰ W9PC 79 WHITLEY CO WB9UNL 68 GREEN/SULLIVAN W9XTZ 30 WISCONSIN 1983 WI WINLINK DIGITAL KB9MMC 260 WI ARES/RACES N9VAO 212 RICHLAND CO W9PVR 184 ‰ QST DE W1AW ƒ THE KEYBOARD WINDOW IS ALSO CLEARED IF A PADDLE IS TAPPED WHILE THE KEYBOARD IS TRANSMITTING. THE THIRD BUTTON SIMPLY CLEARS THE SENT WINDOW. THE FOURTH AND FINAL BUTTON IS ANOTHER MEANS FOR ENTERING THE CALL OF THE STATION BEING WORKED. WHEN CLICKED, A WINDOW POPS UP FOR ENTRY OF THE CALL. FINALLY, THE CONTROLS FOR SETTING KEYER TIMING PARAMETERS ARE LOCATED AT THE UPPER RIGHT CORNER. USING THE SCROLLING CONTROLS, SPEED, WEIGHT, WORD SPACE, LETTER SPACE, SIDETONE VOLUME AND TONE CAN BE SET. TABLE 2 SHOWS A BIT ABOUT HOW THESE ARE CALCULATED. EACH TIME ANY OF THESE PARAMETERS CHANGES, NEW VALUES FOR ALL NECESSARY PARAMETERS 24 BYTES ARE CALCULATED AND SENT TO THE INTERFACE UNIT. THE RELATIONSHIP BETWEEN LENGTH OR DURATION OF DOTS, DASHES AND SPACES IS TAKEN FROM THE ARRL HANDBOOK FOR RADIO COMMUNICATIONS AND IS THE SIMPLE RELATIONSHIP WPM WORDS PER MINUTE 2R4 X DOTS PER SECOND. THIS ASSUMES A WEIGHT OF 50, OR SPACE AND DOT DURATIONS THE SAME AND DASHES EQUAL THREE DOT INTERVALS. CONSTRUCTION FIGURE 4 IS A PHOTOGRAPH OF THE COMPLETED INTERFACE UNIT. FIGURE 5 SHOWS THE INTERNAL LAYOUT OF MY IMPLEMENTATION. THE UNIT IS QUITE SMALL, SO ‰ FROM PAGE 74 ‰ MARYLAND DC 66 ANNE ARUNDEL CO W3NI 66 WESTERN NEW YORK 836 OCTEN KA2ZNZ 323 WDN/MORNING, EARLY, LATE KA2IWK 294 CNYTN/ORCEN WA2PUU 146 CARES K2DAR 73 ILLINOIS 305 LAKE CO W9FUL 225 RADIO WA0JOW 80 INDIANA 177 CLINTON CO ‰ END OF 40 WPM TEXT ‰ QST DE W1AW ƒ