| AEROCOMM MODEL HF 1000+6 |
| http://www.qsl.net/kf8od/ OCENA KF8OD wzmacniacza opracoawnego przez ANDREW BUCKLER K2OP. LDMOS MRFE6VP61K25H 1.8-54MHZ 1.25KW SOLID STATE AMPLIFIER THIS AMPLIFIER WAS FEATURED IN JANUARY 2015 QST MAGAZINE. THE AUTHOR IS ANDREW BUCKLER K2OP. ALL THE CONSTRUCTION DETAILS ARE THERE AND ONLINE. IT WAS VERY EASY TO BUILD AND ASSEMBLE. I USED WHAT I HAD ON HAND. I MADE THE BOARDS WITH A DREMEL TOOL. I HAD THE COPPER BECAUSE I ALWAYS KNEW SOLID STATE AMPS WERE GOING TO GET CHEAP SOME DAY, THE DAY HAS ARRIVED! THESE TRANSISTORS ARE $209.00 FROM MANY SOURCES. IT IS AS EASY AS IT LOOKS! GIVE IT A TRY, YOU WON'T BE SORRY. I MUST THANK JIM W6PQL FOR ALL HIS HELP! LOOK AT HIS WEBSITE FOR SOME GREAT INFORMATION ON LDMOS AMPLIFIERS. THE TRANSISTOR IN MY AMP IS A MRFE6VP61KHSR5, I WAS FLOW SOLDERING IT TO THE COPPER SO I DID NOT CARE IF IT HAD MOUNTING TABS. THE AMPLIFIER IS FINISHED AND WORKING WELL. 30 WATTS INPUT = 1.25KW OUTPUT! THAT IS WITH THE 10DB ATTENUATOR ON THE INPUT. INFORMATION: CHECK OUT W6PQL.COM FOR INSTRUCTION TO BUILD THE INPUT TRANSFORMER. GO TO HIS AMPS CONSTRUCTION PAGE, A LOT OF GOOD INFO. THE CORES ARE PART NUMBER:28B0375-300 I BOUGHT THESE FROM DIGIKEY. THE COAX IS TC-24, BOUGHT FROM COMMUNICATIONS CONCEPTS. THE OUTPUT TRANSFORMER I ORDERED FROM COMMUNICATIONS CONCEPTS, PART NUMBER:RF2067-9. TRANSFORMER CORE IS 2000. 9:1. TYPE 67 MATERIAL. COAX WOUND. THE RESISTORS IN THE BIAS CIRCUIT ARE .5 WATT. THE SET-UP PROCEDURE. CONNECT THE OUTPUT TO A 50 OHM LOAD. CONNECT 50VDC WITH AN AMP METER IN THE CIRCUIT. CONNECT THE BIAS AND ADJUST THE POT FOR 2 AMPS ON THE 50VDC POWER SUPPLY. THAT'S IT. YOU ARE READY TO OPERATE. TAKE THE AMP METER OUT OF THE CIRCUIT FIRST. HI KF8OD P.S. STARTED WORKING ON THE 2 X BLF188XR AMP. |