[Collins] 516f-2 relay mod

[Dr. Gerald N. Johnson]

On Mon, 2009-08-24 at 14:37 +0000, cpa599 at gmail.com wrote:
> Where can I find documentation for this mod?
> I have a 516F-2 which has recently given me a problem ( no power out).
> It has the the relay but no schematic or other documentation.
> 
> Any help would be appreciated.
> 
> Terry
> W8EJO
> ______________________________________________________________
 As far as I can find, the relay mod came from Bud Whitney. It shouldn't
be a complex change to the 516F-2 schematic. In the original schematic
there is a pair of wires that go to the radio that are switched. To add
a relay that transformer primary would go to the relay contacts and that
switched pair of wires would supply power to the relay coil. It reduces
the current to the slightly delicate switch in the radio. When I built
my own supply I chose to not use the switch in the radio for primary
power, but put the power switch on the power supply.

The power supply problem could still the the switch contacts in the
radio, or the transformer, or the primary fuse, or the added relay.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer