[Collins] Bucking Voltage

[Tony]

Not trying to "buck" the crowd here, but why not just
get a 10A variac for about $25 bucks, put in in a box
with a  multi switch power outlet strip and run all
your 516F-2's at their original design voltage? This
also saves the power switches on the KWM2 and 32S as
you can leave them on and switch on the equipment at
the outlet strip.

73,

Tony WV3Z


--- David Knepper <cra@floodcity.net> wrote:
> The consensus from Peter, K2LRC, and Heinz is that
> the secondary voltage
> from the 516F-2 power transformer as a bucking
> winding is too small to get
> any kind of primary reduction voltage.
> 
> See the response below from Heinz
> 
> Dave, W3ST
> Secretary to the Collins Radio Association
> Publisher of the Collins Journal
> www.collinsra.com
> ----- Original Message -----
> From: "Heinz und Hannelore Breuer"
> <hbreuer@debitel.net>
> To: "David Knepper" <cra@floodcity.net>
> Cc: <collins@mailman.qth.net>
> Sent: Sunday, November 09, 2003 2:08 PM
> Subject: Re: [Collins] Bucking Voltage
> 
> 
> > Hi Dave,
> >
> > this topic "Bucking transformer" has been
> discussed on various
> > boatanchor lists several times. I just don't
> remember if it showed up
> > here before.
> >
> > A 5V transformer is too small. Better take a 10V
> or even a 12,6 V
> > filament transformer. Most line voltages are
> running at 125V or even
> > higher. Getting it down by 10V or even more would
> be for the benefit of
> > the transformers. The A-line might have been made
> with a 110V primary
> > back then.
> >
> > Choose a transformer with a secondary current
> rating high enough to run
> > the primary current of the Collins unit you want
> to use. Connect the
> > secondary of this transformer in serial with the
> primary of the Collins
> > unit. Connect the primary to the line voltage.
> Just make sure it "bucks"
> > the voltage and does not "step it up". If it steps
> up just change the
> > wires.I made an external box containing the
> bucking transformer, it has
> > a power cord which goes to the power outlet in the
> wall and also an
> > outlet where I plug in my unit which I want to run
> on a reduced line
> voltage.
> >
> > 73
> > Heinz DH2FA, KM5VT
> >
> >
> >
> >
> > David Knepper wrote:
> > >
> > > Someone mentioned that they use the unused 5
> volt secondary winding to
> buck
> > > the primary voltage in an HT-37.  I wonder if
> the same could be done
> with
> > > the power transformer in the Collins 516F-2.
> > >
> > > I wonder why this trick circuitry has not been
> discussed before to
> reduce
> > > the A.C. voltage on the primary, thus, giving
> some relief to the
> transformer
> > > from the over 120 volt line voltage in many
> areas.
> > >
> > > Thank you.
> > >
> > > Dave, W3ST
> > > Secretary to the Collins Radio Association
> > > Publisher of the Collins Journal
> > > www.collinsra.com
> 


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