[R-390] R390A power cord specifications

[John Wendler]

Don, thanks!  My wife (Mom’s house is largely 2-wire) and I admired the
elegance of design, but I wondered if the feature was reliable enough in
actual use.

On Thu, Dec 29, 2022 at 11:07 AM Don Heywood <donwc4g at gmail.com> wrote:

> Good morning John I would assume that the R390 a came with a large 16
> gauge cord, however, 18 three will work just fine. Regarding those power
> plugs with the rotatable ground, the navy repair shops would cut those off
> immediately. They are very dangerous by removing the ground especially on
> these receivers.
> Happy new year
> Don, WC4G
>
> Sent from my iPhone
>
> > On Dec 29, 2022, at 10:56, John Wendler <wendlerjrv at gmail.com> wrote:
> >
> > Does anyone have an authoritative specification on the power cord for
> the
> > as-shipped R390A?  I do not see a length requirement in MIL-R-13947B and
> > have not yet spotted a part number in the manuals that I looked at.
> >
> > The power requirement (275 Watts, max) in conjunction with the lower
> > voltage (115 VAC) says the maximum current that cord will carry is about
> > 2.4 Amps.  The brackets that capture the power cord on the rear panel
> set a
> > maximum outer insulation diameter of approximately 0.36 inches. 18/3 SOOW
> > should work, but I was wondering about the historical lore.  I expect
> that
> > installers would have chopped or replaced as necessary for a neat
> > installation.
> >
> > As an aside, one of my units came with a plug that had a rotatable ground
> > pin for use with either 2-wire or 3-wire power outlets.  Point the pin
> > forward for 3-wire outlets; rotate it 90 degrees out of the way for the
> > 2-wire outlets.  The ground wire is secured by a lug to the screw that
> the
> > pin rotates around.
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