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PK1-L.001
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1990-10-11
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756b
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20 lines
FILE NAME: PK1-L.001 @ VE3EUK REQMOD
RADIATED NOISE FROM A PK1-L CAN BE SEVERE. BYPASS ALL ACTIVE LEADS
ON EACH DB 25 CONNECTOR WITH .001 MFD. CAP'S (MINIATURE CERAMIC PLATE TYPE).
THE OTHER THING TO DO IS THIS:
PUT A WIRE BOND FROM THE MOUNTING SCREW OF EACH DB-25 CONNECTOR THRU
THE HOLE IN THE CIRCUIT BD. AND SOLDER TO THE GND. BUSS AT THAT HOLE.
THAT IS 4 GND. STRAPS. THE BACK PLANE MAY NOT BE MAKING
CONTACT WITH THE GND. BUSS ON THE BD. AND WILL RADIATE NOISE.
WE HAD SEVER NOISE AT VE3KSR-0 DIGI AND IT WAS CAUSING SEVERE
DESENSE AT VE3KSR REPEATER ON 146.370 INPUT.
AS EXTRA INSURANCE YOU CAN ALSO PUT A BONDING WIRE FROM PIN 1
OF YOUR DB25F PLUG TO THE SHELL OF THE PLUG.
73 JOHN VE3AMZ @ VE3EUK P.B.B.S. KITCHENER.