[R-390] R-392 Mech.Parts Question

Fri, 25 Jan 2002 09:28:10 -0600

On Fri, Jan 25, 2002 at 09:12:11AM -0600, Harry Joel wrote:
> Hello All 
> 
> checking out my recently obtained R-392, I discovered
> the Bandwidth (three position) knob was free-wheeling.
> The coupling from knob shaft to rotary switch shaft is
> made up from three pieces. There is a matching slot on
> the top and middle coupling piece.  A part must have been
> there at one time to link the two together. A view is here:
> 
> http://www.cyberlane.net/~organic/R-392-Bandwidth-Coupling.jpg
> 
> I dont quite understand the need for a three-piece coupling here
> and would like to hear from experts.

It's an Oldham coupler, which compensates for any misalignment
(well, _some_ misalignment) of the front panel and chassis.

IIRC, Fair Radio has them for R-390-flavored boatanchors, and
for not too much money. I don't know if the 392 and 390 couplers
are interchangeable.

_Very_ nice photo. Thanks; good photo work makes questions like
yours _much_ more answerable.

-- 
Mike Andrews
[email protected]
Tired old sysadmin since 1964