[R-390] unstable BFO note on R-390A

[Joe Foley]

--- Bob Young <youngbob53 at msn.com> wrote:

> Dan,
> 
> Thanks, but the problem is that there is a flat part
> on the shaft where the 
> set screw goes which only allows a little leeway
> either way for the knob.
+++++++++++
You need to look behind the front panel for a coupling
in that shaft, it has one of those clamps you find on
the gear shafts, you'll need a Bristol wrench for the
set screw.


> The gear I'm talking about is the split gear that is
> right behind the main 
> tuning knob if I remember right. It is supposed to
> eliminate backlash I'm 
> pretty sure.
++++++++++++++
Check the setscrews on the Oldham coupler sections,
they may be loose.



 When I wiggle the main tuning knob with
> the BFO centered and on 
> I can knock it off zero beat by wiggling the knob,
> sometimes it goes back 
> other times no. This is without turning the knob at
> all, it will jump all  
> over the place. I'm wondering if this could be in
> the VFO or is something in 
> the gearing mechanism or maybe because the springs
> are not equal the split 
> gear is not functioning properly? not sure, oh also
> when tuning in a station 
> with the .1 khz position it is also very hard to
> keep it peeked and tuned it 
> jumps all over the place also along with the BFO if
> that helps.
+++++++++++
Also, look at the back of the BFO knob, it has a
detent lug that keeps it from being turned more than
one full turn, that has to engage the stop at the
bottom of the shaft hole, that knob has to be slid on
far enough to engage that but not so far as to rub the
panel.

JOe


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