Date   : Thu, 19 Apr 1984 08:41:25 CST
From   : ERWINVL.DLOS@XEROX.ARPA
Subject: Re: Info-KayPro>??

RICK,

I HAVE BEEN VERY INTERESTED IN THE KENTRONICS UNIT SINCE I SAW IT IN THE
RECENT ISSUE OF QST. IT IS STILL UNAVAILABLE HERE IN THE DALLAS AREA. I
AM IN HOPES OF BEING ABLE TO PICK UP ONE WHEN I GO TO DAYTON. SUGGEST
YOU TRY A FEW THINGS JUST TO SEE HOW THE RF (IF IT IS) GETTING INTO THE
KENTRONICS OR THE KAYPRO. TRY WRAPPING THE KENTRONICS IN ALUMINUM FOIL
AND GROUNDING IT TO YOUR STATION GROUND. GROUND LEAD SHOULD BE AS SHORT
AS POSSIBLE. ALSO BE SURE THAT YOU HAVE THE KAYPRO TIED TO YOUR STATION
GROUND WITH HEAVY BRAID. YOU SHOULD NOT DEPEND ON THE 3RD WIRE IN ANY AC
CORD FOR A GOOD RF GROUND. ALSO MAKE SURE THAT YOUR RS-232C CABLE IS
SHIELDED. IN SEVERE CASES ALTHOUGH NOT NECESSARILY WITH THE KAYPRO, I
HAVE SEEN RF "WALK" RIGHT IN ON THE SHIELD DESPITE THE FACT IT WAS
GROUNDED. THIS IS DUE TO THE SHEAR LENGTH OF THE CABLES THAT ARE USED IN
SOME OF THE COMPUTER SYSTEMS TODAY. IF THAT IS A SUSPECT YOU MIGHT TRY
TO PLACE A LARGE TORROID AROUND THE RS232 CABLE AS IT ENTERS THE KAYPRO.
I HAVE NEVER SEEN THE KENTRONICS UNIT BUT I BELIEVE THE ONLY GROUND THAT
THEY HAVE IS BY WAY OF THE RS232 CABLE. THIS IS TOO LONG OF A GROUND
PATH TO GET EFFECTIVE RF GROUNDING. YOU MIGHT EVEN TRY GROUNDING IT
BETTER AND KEEPING THE PATH AS SHORT AS POSSIBLE. PLEASE KEEP ME
INFORMED OF YOUR PROGRESS AND YOUR PERCEPTION OF THE UTU BECAUSE I PLAN
TO MARRY ONE UP WITH MY XEROX 820 ES MY YAETSU 757.


                               REGARDS,

                                VAL L. ERWIN
                                W5PUT
                                (214) 960-3174