WD7S PRODUCTIONS
UPDATES
NEW 01-12-10 THE CURRENT TRIODE BOARDS HAVE THE SILK SCREEN FOR D-18 REVERSED
NEW 01-12-10 THE TRANSFER CHARACTERISTIC FOR THE 4N38, U3, HAS CHANGED. R-35 SHOULD BE 1 MEG. THE IP TRIP CIRCUIT WILL NOT FIRE WITH THIS NEWER CHIP. THIS CHANGE MAY HAVE HAPPENED AROUND 1-1-2009. LET ME KNOW BY E-MAIL IF YOU NEED THE RESISTOR
NEW 01-12-10 THE CURRENT DS-1 BOARDS HAVE A MISSING TRACE FROM PIN 14 OF U-6 TO THE CATHODE OF LED D-46, (IP BARGRAPH). BE SURE TO USE THE SPARE LEAD OF D-46 TO MAKE THE CONNECTION TO PIN 14. THE TRACE IS SHOWN ON THE DOCUMENTATION
NEW 06-03-09 I HAVE A COPY OF THE TAP PROGRAM HERE [TAP2.ZIP]
NEW 02-14-2004
THE
FOLLOWING SCOPE TRACES SHOW MAKE TIMING OF THE AROMAT
RSD-12V RF REED RELAY, (AVAILABLE FROM RICH MEASURES OR NEWARK). THE FIRST
DISPLAY SHOWS THE RELAY BEING OPERATED AT IT'S LABEL VOLTAGE OF 12VDC. THE
TOP TRACE IS THE 50WPM KEYING SIGNAL AND THE BOTTOM TRACE IS THE CONTACT
CLOSURE. HORIZONTAL DIVISIONS ARE 100us. THE RELAY CLOSES IN JUST
UNDER 600us. A 9VOLT BATTERY WAS USED TO DISPLAY THE MAKE TIME. A
REGULATED BENCH SUPPLY USED FOR THIS WILL EXHIBIT RINGING THAT CAN SOMETIMES BE
MISTAKEN FOR CONTACT BOUNCE.
(CLICK ON IMAGES FOR FULL SIZE VIEW)
THIS DISPLAY SHOWS THE SAME RELAY BEING OPERATED AT 24VDC WITH A SERIES CURRENT LIMITING RESISTOR, (AS IN THE RF-04). MAKE TIME IS NOW ~350us.
THE FOLLOWING SCOPE DISPLAY SHOWS THE RELATIONSHIP OF A TRANSCEIVER'S AMP KEY LINE AND THE RF ENVELOPE. THE TRANSCEIVER IS AN ICOM IC-736 WITH A MOSFET INTERFACE ON THE ACC JACK FOR AMP KEYING, (NO INTERNAL RELAY). THE TOP TRACE IS THE AMP KEY LINE PULLING A 9 VOLT SOURCE LOW AND THE LOWER TRACE IS THE RF SAMPLE AT A 50 OHM DUMMY LOAD. KEYING SPEED IS ~45WPM DIT STRING. THERE IS ALMOST 10MS BEFORE RF IS PRESENT AFTER THE AMP KEY LINE CLOSURE AND THE DECAY SHAPING IS DONE BEFORE AMP KEY LINE RELEASE. THE TRANSCEIVER IS SET FOR FULL BREAK-IN QSK.
THE FOLLOWING SCOPE DISPLAY SHOWS THE RELATI0ONSHIP OF A KILOVAC HC-1 BEING OPERATED AT IT'S RATED VOLTAGE OF 26.5 VDC BY THE SAME KEYING INTERFACE ABOVE. THE RELAY'S N.O. CONTACTS ARE PULLING A 9 VOLT SOURCE LOW AND TAKES ~2MS TO CLOSE WHILE ADDING ~1MS (RELEASE TIME) TO THE PERIOD BETWEEN END OF CHARACTER AND OPENING OF THE RELAY. KEY SPEED WAS 36WPM DIT STRING. THERE IS AMPLE TIME FOR PROPER SHAPING WITHOUT ANY SPEED UP CIRCUITS. HOT- SWITCHING THE RELAY ON EITHER CLOSE OR OPEN IS UNLIKELY.
THE FOLLOWING DISPLAY SHOWS ACTUAL RELAY MAKE TIME. KEY SPEED WAS 15.6HERTZ OR ~37WPM DIT STRING. TOP TRACE IS THE TRANSCEIVER AMP KEY LINE PULLING THE RELAY FIELD LOW. BOTTOM TRACE IS THE N.O. CONTACTS CLOSING WITH A 9 VOLT SOURCE CONNECTED. RELAY VOLTAGE IS 26.5 AND CLOSURE TIME IS 2.3MS, (500us PER HORIZONTAL DIVISION). BOUNCE IS NEGLIGIBLE
THIS DISPLAY SHOWS THE RE-MAKE TIME OF THE N.C. CONTACTS. ALL VOLTAGES ARE THE SAME AS WELL AS KEYING SPEED. REMAKE TIME IS 1.14MS WITH ~1MS BOUNCE
THIS DISPLAY SHOWS THE TIME FROM AMP KEY LINE RELEASE TO RE-OPEN OF N.O. CONTACTS. OPENING TIME IS 940us. AGAIN THE SAME KEY SPEED AND VOLTAGES WERE USED. THE SPIKE ON THE UPPER TRACE (FIELD VOLTAGE) IS THE INDUCED VOLTAGE FROM THE RELAY'S FIELD COLLAPSING. A .1UF CERAMIC CAPACITOR WAS USED IN PLACE OF A CLAMPING DIODE. THIS DAMPENS THE SPIKE WITHOUT SLOWING DOWN THE RELEASE.
THIS RELAY WAS A UNIT SUPPLIED BY ALLEN BOND. I HAVE PERSONALLY TIMED OVER 50 RELAYS INCLUDING HC-1 AND THE JENNINGS RJ-1. NONE OF THE RELAYS TIMED AT RATED VOLTAGE HAVE EVER EXCEEDED 2.5MS CLOSURE TIME. 08-11-03
ALL PRODUCTS
SEVERAL OF THESE PRODUCTS ARE FOR ADVANCED BUILDERS ONLY. IF YOU DO NOT HAVE A THOROUGH UNDERSTANDING OF ELECTRONICS PLEASE DO NOT ATTEMPT THEM.
(02-21-03)
DS-1 DISPLAY BOARD
BOTH LENSES ARE NOW BACK IN STOCK. I HAVE BEEN BUILDING A NEW SHOP AND TIME FOR THE SCREEN PRINTING HAS BEEN LIMITED. I HAVE SEVERAL YEARS OF STOCK NOW 07-29-2008
C-3, A 10UF ELECTROLYTIC CAPACITOR WAS LEFT OFF THE PARTS LIST AND IS NOT ON ANY SCHEMATIC. IT IS ONE OF SEVERAL RESERVOIR CAPS SPREAD ABOUT THE BOARDS VARIOUS POSITIVE SUPPLY RAILS. (02-27-02)
TRIODE CONTROL BOARD
WHEN USING PLATE CHOKES BELOW 300uh AND
POOR CHOKE BY-PASSING RF PASSED THROUGH THE PSU MAY BE PRESENT ON THE B-
RAIL. THIS CAN CAUSE FALSE GRID CURRENT. THE REMEDY IS TO PLACE A
1mh CHOKE IN THE LINE FROM THE B- RAIL TO THE CONTROL BOARD, (B- @ 10 OHM, J6) 07-22-2006
PARTS LIST ERROR ON THE REV-1 TRIODE
BOARDS SHIPPED BEFORE12-21-04
D-37, 1N4003 SHOULD BE LISTED AS D-39, 1N4003. IT IS
MARKED CORRECTLY ON THE PARTS LAYOUT (12-21-2004)
WHEN USING SSRs WITH LARGE PLATE TRANSFORMERS THERE MAY NOT BE ENOUGH CURRENT DEMAND DURING STAND-BY TO KEEP THE SSR LATCHED ON. THIS WILL MAKE THE TRANSFORMER HUM. THIS SSR DROP OUT CAN BE CURED BY ADDING A RESISTOR SHUNT ACROSS THE TRANSFORMER PRIMARY. FOR THE D SERIES CRYDOM RELAYS, A MINIMUM OF 40MA LOAD IS REQUIRED. A 10K 10 WATT RESISTOR ACROSS THE PRIMARY WILL NORMALLY TAKE CARE OF THE HUM. (09-24-03)
WHILE EXPERIMENTING WITH A DIFFERENT OUTPUT DETECTOR I WAS ABLE TO GET RF INTO THE VCC LINE. THIS WAS TRIGGERING THE GATE OF Q-2 IN THE TIMING CIRCUIT AND PUTTING THE AMP IN WAIT MODE. THE FIX WAS; .001 BY-PASS CAPS AT R-11(PIGGY-BACKED) AND AT THE VCC LINE ON THE POWER SWITCH LAMP. I ALSO ADDED A FERRITE BEAD ON THE OUTPUT DETECTOR LINE WHERE IT ENTERS THE BOARD CONNECTOR. I APPLIED ALL OF THESE AT ONCE AND DON'T KNOW WHICH ONE DID THE JOB. (02-27-02)
TO ACHIEVE A 6 MINUTE WARM UP DELAY FOR THE YC-156/YC-179 CHANGE THE VALUE OF C-4 TO 220UF OR PARALLEL ANOTHER 100UF CAPACITOR TO THE PADS OF C-4 ON THE BACK OF THE BOARD. (02-27-02)
I NOW HAVE TALLER HEAT SINKS (2 INCHES) FOR THE BIAS PASS TRANSISTOR, Q-12. THOSE USING YC-156/ YC179 ABOVE 3000 WATTS SHOULD USE THIS IF THE BOARD IS OUT OF DIRECT AIRFLOW. (02-27-02)
