[ARC5] Fwd: Re: [MRCA] SCR-274-N receiver bandwidth spec

[AKLDGUY .]

> FYI, if you connected the fields in parallel and ran the machine at 12
> VDC, it would run a bit below half speed, and the output voltage would be
> half.

Thanks, that's very useful info. The receivers would no doubt benefit from
the half-voltage and would run just as well as normal.

73 de Neil ZL1ANM


On Thu, Mar 27, 2014 at 9:54 AM, J. Forster <jfor at quikus.com> wrote:

> Thank you.
>
> FYI, if you connected the fields in parallel and ran the machine at 12
> VDC, it would run a bit below half speed, and the output voltage would be
> half.
>
> -John
>
> ==============
>
>
>
> >> However, I would like to know if the input side of the dynamotors
> >> (mainly
> >> for the receivers) are Shunt or Compound wound (ie, do they have shunt
> >> or
> >> shunt & series fields).
> >
> > The receiver dynamotors have the two fields connected in series across
> the
> > 28V input terminals. Back around 1978 I disassembled one and considered
> > rewiring the fields in parallel to permit better operation at 12-14V. I
> > never got around to doing it, so can't report whether 12-14V operation
> was
> > improved or not. It would have been a very simple mod because the
> > interconnecting wire was readily accessible.
> >
> > 73 de Neil ZL1ANM
> >
> >
> > On Thu, Mar 27, 2014 at 5:23 AM, J. Forster <jfor at quikus.com> wrote:
> >
> >> Not for me, as I've little interest in retuning the sets.
> >>
> >> However, I would like to know if the input side of the dynamotors
> >> (mainly
> >> for the receivers) are Shunt or Compound wound (ie, do they have shunt
> >> or
> >> shunt & series fields).
> >>
> >> The dynamotor is actually more complez than I thought originally. It has
> >> been pointed out to me that the armature and field are not independant,
> >> as
> >> assumed in most analyses. Rather, they are oupled by their mutual
> >> inductance.
> >>
> >> -John
> >>
> >> ============
> >>
> >>
> >> > On 26 Mar 2014 at 7:52, J. Forster wrote:
> >> >
> >> >> The winding data might be in the manuals somewhere?
> >> >
> >> > Yes. That winding data IS in at least one of the manuals, the Navy
> >> one. I
> >> > can
> >> > dig it out if anyone seriously needs it.
> >> >
> >> > Ken W7EKB
> >> >
> >> >
> >>
> >>
> >> ______________________________________________________________
> >> ARC5 mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/arc5
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:ARC5 at mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >>
> > ______________________________________________________________
> > ARC5 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/arc5
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:ARC5 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> >
>
>
>