I received this information from a ham that I have been corresponding with, and am reposting it here (with permission) to preserve it for posterity in the bitverse.
==================BEGIN FORWARDED MESSAGE================== Hello Jim Well one month later I finally have the jumping digits solved. I traced the problem to be U9014 picking up noise. U9014 is on the DR-7 board, and is a divide by ten for the in coming 500kc ref. signal. So I changed the MC14017 IC, to find now that it was completly dead, no digits, no decimal point. So I tried a different brand of IC (Texas Inst) and got a decimal, but no digits. In poking around I found if I put my finger tip on the reset pin of the IC it would work.I ended up bypassing pin 1 of U9014 to ground with 220pf disc cap, and all is well. I guess there is some noise at the output on that divide by ten,and the cap took care of it. Radio has been on for 20 hours with no digit hicups! I'am not very familiar with digital logic, so this has been a good problem for me to get a handle on. ===================END FORWARDED MESSAGE=================== -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://radiojim(dot)exofire(dot)net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
