[R-390] Reduced 500-1000KHz sensitivity

[Joe Foley]

Mmm,

That sounds like a mechanical mis-alignment to me.  Again, maybe some crud somewhere.

Make sure the rollers actually roll, I have an RF deck in a R-390A that was improperly assembled and the "rollers" aren't in the right place so they are more like sliders.  It's the way they were pressed onto the shaft.

Joe




--- On Wed, 3/16/11, Barry Williams <ba.williams at charter.net> wrote:

> From: Barry Williams <ba.williams at charter.net>
> Subject: Re: [R-390] Reduced 500-1000KHz sensitivity
> To: r-390 at mailman.qth.net
> Date: Wednesday, March 16, 2011, 8:53 PM
> Joe,
> 
> One of mine has a slug that will hang up infrequently when
> changing mHz 
> settings. I'm now in the habit of rocking the mc knob a
> little to settle 
> the slug.
> 
> 
> the other other Barry
> > The quickest thing to check is to see that the slug
> racks are not hanging up and that the cam followers are in
> fact following the cams tightly.  there could be crud
> built up on the cams or rollers.  Also, check that all
> of the springs are attached to the slug racks.  Check
> the slides for lumps of crud, etc.
> >
> > Clean, clean, clean, oil.
> >
> > Joe
> >
> >
> >
> >
> > --- On Tue, 3/15/11, Ian Gallimore<iangallimore at rogers.com> 
> wrote:
> >
> >> From: Ian Gallimore<iangallimore at rogers.com>
> >> Subject: [R-390] Reduced 500-1000KHz sensitivity
> >> To: "R-390A Group"<r-390 at mailman.qth.net>
> >> Date: Tuesday, March 15, 2011, 11:05 PM
> >> Hi, group,
> >>
> >> My 390A was purchased from Fair five or six years
> ago.
> >> I've recently noticed a significant decrease in
> sensitivity
> >> in the 500-1000KHz band. Other bands appear to be
> OK. Just
> >> before this occurred, I noticed that the
> sensitivity could
> >> be dramatically increased by turning the MHz knob
> a little
> >> toward the 01 setting and back, but this no longer
> helps.
> >> Has anyone else noticed this?
> >> Any suggestions gratefully received.
> >>
> >> 73
> >>
> >> Ian VA3ODA
> 
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