[Hallicrafters] SX28A information needed

[Roy Morgan]

On Oct 13, 2009, at 5:38 PM, J ALLEN CALL wrote:

>
>
> I have been trying to find a dial lock that is used on the SX28A  
> main tuning knob but to no avail.

You are not alone.  I have two SX-28's and only one dial lock  
mechanism.  Many others have one radio and no lock.

>  So I am trying to duplicate the lock.

The only part that you can't make fairly easily, as I remember the  
thing, is the little handle.

>  Can sometime take the time to tell how the dial lock works.  Is it  
> something like a caliper
> that grasps the dial plate on both sides

Yes, that's how it works, basically.. The thing has two long  
rectangular bars that are held to the chassis with two screws directly  
below the dial.  The bars are formed out of flat slightly so that the  
clamping device pinches the dial skirt between them at the upper end  
when tightened but spring out of contact with the skirt when released.

The "clamping device" is as follows: a clearance hole is in the outer  
bar and a threaded hole is in the bottom bar.  The little lever thing  
you move with your finger is a thin rod with a larger cylindrical  
section at the end of it.  This lever threads into the clamping stud  
(I'll call it) which has a threaded piece to engage the bar closest to  
the panel and pass through the outer bar.  The outer end of the  
clamping stud is larger than the threaded part, has a threaded hole at  
the outer end for the "little lever thing" and a shoulder to press the  
outer bar toward the dial skirt.

> Any information would be helpful.  Thanks.

I'll send you a picture off list that shows the thing with only modest  
clarity.  It will give you an idea what I am talking about.

Roy

Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073
Home: 607-898-3607
Cell: 301-928-7794