Paul, I would about bet that your PTO "jump" is due to hardened grease and or dirt in the ball bearings of the PTO shaft. I have had some luck carefully putting a drop of oil on the ball bearing grease and running the PTO back and forth. Be very careful not to get anything on the nylon/plastic parts.
Have a look here for some discussion on the PTO and damage/repair from grease and oil of the wrong parts of the PTO. http://www.wb4hfn.com/DRAKE/DrakeArticles/PTO/Drake_PTO.htm There is also an allen wrench "tension" that might be in your TR4 that may assist. Be very careful not to get carried away on this as it is a very "light" adjustment. Damage occurs easily as I recall. http://www.wb4hfn.com/DRAKE/DrakeArticles/TechTips/PTO-Repair.htm 73, Ron WD8SBB --- On Fri, 1/28/11, Paul Gerhardt <[email protected]> wrote: > From: Paul Gerhardt <[email protected]> > Subject: [Drakelist] TR-4 PTO instability > To: [email protected] > Date: Friday, January 28, 2011, 8:44 PM > After getting the low RX sensitivity > resolved, I managed to get the > TR-4 on the air and checked into ECARS on 40M. RX > sensitivity is > good. TX power and audio is good. > > PTO jumps when trying to really get it close on frequency > maybe 300 > cycles or so when you touch the know. Without > touching the knob the > PTO stability seems 'normal' so can this mechanicall > instability be > 'cured' by working on the drive? > > The other issue that remains is the 'non X' filter seems to > be open. > Anybody have one? > > Paul > > -- > Paul Gerhardt > K3PG > http://pgerhardt.blogspot.com > QRP ARCI 6674 > FP 274 > > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist > _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
