On 07/10/2010 03:18 AM, VK3XAO wrote:
On Jul 9, 5:16 pm, wrote:
I have a large 5 gang variable cap with anti-backlash gear and worm
drive, does anyone know what radio it comes from? You can see a pic
hehttp://www.radiowymsey.org/IMG_0003.JPG

The cap is approx 6 x 3 x 2 inches

Thanks,

Charlie.

--
M0WYMwww.radiowymsey.org

Sales @ radiowymseyhttp://shop.ebay.co.uk/gnome7763/m.html?

Probably from a SCR-269 (BC-433) or ARN-7 Radio Compass. Loop, 2 RF,
Oscillator and Mixer tuning.

John Mackesy VK3XAO
The capacitor has a second gear driving a sliding rod, probably used to
move a dial pointer (see the two gears below the worm gear?). I suspect
the radio was tuned via a motor connected via a spline to the worm drive
and the moving rod was somehow connected to the dial pointer.

On 11/07/10 18:51, Kenneth Scharf wrote:

The capacitor has a second gear driving a sliding rod, probably used to
move a dial pointer (see the two gears below the worm gear?). I suspect
the radio was tuned via a motor connected via a spline to the worm drive
and the moving rod was somehow connected to the dial pointer.

See the pic at http://www.fidnet.com/~seanbart/SCR-...-443-A_Top.jpg , I
think the rod is there to act as a stop, there is a pin on the sliding
piece that hits another pin at each end of the lead screw and inhibits
rotation.


Charlie.

--
M0WYM
www.radiowymsey.org

Sales @ radiowymsey
http://shop.ebay.co.uk/gnome7763/m.html?

On 07/12/2010 04:59 PM, M0WYM wrote:
On 11/07/10 18:51, Kenneth Scharf wrote:

The capacitor has a second gear driving a sliding rod, probably used to
move a dial pointer (see the two gears below the worm gear?). I suspect
the radio was tuned via a motor connected via a spline to the worm drive
and the moving rod was somehow connected to the dial pointer.

See the pic at http://www.fidnet.com/~seanbart/SCR-...-443-A_Top.jpg , I
think the rod is there to act as a stop, there is a pin on the sliding
piece that hits another pin at each end of the lead screw and inhibits
rotation.


Charlie.

That would have been my second guess. The 5 tie plates holding the
rotor plates together binding against the stator plates would have
worked as a stop (that's how MOST caps work), but might not be a good
idea in a motor driven tuner.