On Sun, 31 Jan 2010 10:35:49 -0500, Curt Nixon wrote: >Good Morning All: > >Regarding my TR7: > >It has AC on the carrier in CW mode. >that could do this. Filters on the PS board in the TR perhaps?
Could be, but I would say replace them anyway. I always say that. They are getting old and will eventually start to fail. That is one of the things on my "must do" list WRT refurbing a TR7. >A second issue is that I notice the pilot lights dimming when keying and >an associated slight chirp in the sidetone..although there is no >detectable chirp on the RF signal. I'm not really concerned about the >lights but I read the article about adding the low current feed lines to >the DC cable and it said something about copupling the voltage variation >into the audio circuits. WIll the low current isolation alter the >chirpy sidetone? Probably not, although it is a recommended mod anyway. For sidetone issues, see K8AC's excellent article on fixing CW issues here: http://www.wb4hfn.com/DRAKE/DrakeArticles/TR7_Key_Clicks.pdf 73, -Jim -- 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 Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
