[R-390] R390A - Re: Hard Tuning

[ToddRoberts2001 at aol.com]

In a message dated 6/17/2004 8:36:02 PM Eastern Daylight Time, 
fev at ciudad.com.ar writes:
Hello, I bought here in Argentina a R390A manufactured by Collins.
It works good, maybe not  so good like I suppose it must work , but my
question now is how smooth must be the tuning , in my case is a little
hard and
I get a little tired tuning it if I compare it with other like the TS830
or the old SX100  I have. It is posible working on it to obtain a nice
tuning or it is like it is? 
One common cause of hard or stiff tuning in the R-390A is a misaligned 
front-panel bushing for the main tuning shaft. First remove the main-tuning 
kilocycle-change knob. Then take a large crescent wrench/adjustable wrench and loosen 
the large hex-nut that holds the tuning shaft bushing in place. Loosen it just 
enough so that you can turn the whole bushing freely. See if that frees up 
the stiff tuning. If so then re-tighten the large hex-nut to secure the bushing 
in place - make sure the tuning shaft still turns freely after you do this, 
and apply a drop or two of oil where the main-tuning shaft comes through the 
bushing. I have seen several R-390A's that had very stiff tuning due to a 
misaligned front panel bushing. After aligning the bushing the tuning became easy and 
smooth as silk. I believe I got some very good deals on a couple of R-390A's 
that had this problem but the seller didn't know how to fix it and probably 
thought there was something major wrong with the tuning being so stiff. This is 
just a starting point. There can be many causes of hard or stiff tuning but 
always best to check the simple things first. 73 Todd Roberts WD4NGG.