DUAL PENTODE SHORTWAVE REGENERATIVE RECEIVER (1600 KHZ TO 14.75 MHZ)

Description

I MAKE THESE TO ORDER, SO PLEASE ALLOW 7 TO 10 DAYS FOR SHIPMENT. A FEW OF THE PARTS MAY BE NOS OR USED SO I HAVE TO LIST THESE RADIOS AS "PREOWNED" EVEN THOUGH CURRENTLY CONSTRUCTED.
THIS RADIO USES THE 815 VHF DUAL PENTODE TRANSMITTER TUBE. IT WORKS GREAT. ONE OF THE BEST REGEN RECEIVERS I'VE EVER MADE FOR COPYING SSB AND CW ON THE HAM BANDS! THE 815'S ARE A LITTLE PRICEY BUT THE PERFORMANCE OF THIS RADIO IS WELL WORTH SPENDING THE EXTRA $$$'S.
YOU'LL ONLY NEED ABOUT 12 TO 14 VOLTS DC TO RUN THIS RADIO. WITH THE DOUBLE PENTODE CIRCUIT IT HAS GOOD VOLUME AND SELECTIVITY.
THE WIRING HARNESS PROVIDED HAS A SEPARATE DC INPUT FOR THE B+ PLATE VOLTAGE IF YOU WANT TO RUN IT HIGHER THAN THE 12 VOLT FILAMENT. HOWEVER, YOU CAN RUN THIS RADIO WITH ONLY ONE POWER SOURCE.
I FOUND THAT RUNNING THE B+ AT 15 TO 20 VOLTS ONLY INCREASES THE VOLUME SLIGHTLY. SO FOR PRACTICAL PURPOSES IT'S PROBABLY BEST TO JUST PARALLEL THE B+ AND FILAMENT WIRES, USING ONLY ONE 12 TO 14 VOLT SOURCE.
THIS RADIO REQUIRES A HI-Z INDUCTIVE (2 TO 4K OHMS) OR PIEZO HEADSET (NOT INCLUDED).  IT COMES WITH A WIRING HARNESS AND THE 2 SHORTWAVE PLUG-IN COILS, SIMILAR TO THOSE SHOWN IN THE LAST 3 PHOTOS.
THE COILS PROVIDE CONTINUOUS COVERAGE FROM ABOUT 1600 KHZ AT THE TOP OF THE AM BROADCAST BAND, UP TO ABOUT 14.75 MHZ. SO YOU HAVE MOST OF THE SHORTWAVE SPECTRUM, FOR DOMESTIC AND FOREIGN BROADCASTS, PLUS SEVERAL HF HAM RADIO BANDS.
THE FIRST PHOTO SHOWS THE RADIO WITH A PLUG-IN COIL FOR THE AM BROADCAST BAND, WITH COVERAGE BEGINNING AT 460 KHZ, JUST BELOW THE 630 METER HAM BAND (THAT COIL NOT INCLUDED). COILS ARE NOT THAT DIFFICULT TO WIND IF YOU SHOULD LATER DECIDE TO MAKE ONE FOR THE BROADCAST BAND. I HAVE ADDITIONAL COIL FORMS FOR PURCHASE ON OTHER LISTINGS.
THE RADIO HAS MAIN AND FINE TUNING, REGEN AND ANTENNA COUPLING CONTROLS ON THE FRONT PANEL.
IT WILL RUN ON MOST ANY WELL FILTERED DC SUPPLY VOLTAGE CAPABLE OF DELIVERING AT LEAST 1 AMP CONTINUOUS DUTY.
IT WILL ALSO WORK WITH BATTERIES. FOR SMALLER BATTERY TYPES YOU'LL WANT TO USE SOMETHING LIKE A LITHIUM-ION OR Ni-CAD CORDLESS DRILL TYPE BATTERY (12 VOLT VERSION), CAPABLE OF DELIVERING THE REQUIRED CURRENT. YOU CAN ALSO USE 12 VOLT LEAD-ACID TYPE BATTERIES, OF MOST ANY SIZE, UP TO AND INCLUDING A REGULAR CAR BATTERY. IT IS ALWAYS A GOOD IDEA TO FUSE THE INCOMING POWER SOURCE LINE WITH A 2 TO 3 AMP FUSE.
YOU'LL NEED A WIRE ANTENNA OF AT LEAST 25 TO 50FT IN LENGTH, ALONG WITH A GOOD EARTH GROUND. A 75 TO 100 LENGTH ANTENNA WILL PERFORM BEST ON THE LOWER FREQUENCIES. AS STATED, AN ANTENNA COUPLING CONTROL IS PROVIDED FOR ADJUSTING TO DIFFERENT ANTENNA LENGTHS. THIS RADIO HAS SO MUCH GAIN THAT ON THE AM BAND YOU'LL NEED TO SET THE ANTENNA COUPLING CLOSE TO MINIMUM. GREAT RADIO FOR THE DX ENTHUSIAST!
I GUARANTEE THIS RADIO WILL WORK IF YOU HOOK IT UP PROPERLY. I WILL INCLUDE A HAND SKETCHED SCHEMATIC DIAGRAM OF THE CIRCUIT, PLUS A BLOCK DIAGRAM SHOWING WHERE TO HOOK THE ANTENNA, HEADPHONES, POWER, ETC.
AGAIN, THE RADIO WILL BE CONSTRUCTED WHEN ORDERED, BUT SINCE THE 815 TUBE AND A FEW OF OTHER PARTS ARE USED, I'M LISTING IT AS A USED ITEM. BETTER THAN 80% OF THE PARTS ARE NEW OR NOS. THANKS FOR LOOKING......KW7T
**********SHIPPING TO THE UNITED STATES ONLY*********