Heathkit K1 Plug-in coils

[Mark Graalman WB8JKR]

  The typical regen is tuned by the frequency of the input
circuitry. If you can measure the minimum and maximum
capacitance of the frequency tuning variable then all you really
have to do is wind a coil that will allow tuning the desired range.
 For example, if the tuning variable measures 20 - 300 pf and
you wound a coil with a value of 10 uH, the receiver would then
tune from about 2.9 to 11 MHz. The coupling winding to the antenna
could be by trial and error, but I would say about 10 turns spaced
from the main 10 uH winding about 1/4" would work well, the
feedback winding would also be by trial and error, but about 3-5
turns spaced about 1/4" below the main 10 uH winding would
also be a good starting point.

73,  Mark  WB8JKR

On Fri, 30 Apr 2004 07:14:41 -0700 paul hendershott
<pjhend at AMERITECH.NET> writes:
> Does anyone know the approximate values of these two windings or how
> one would wind their own on a standard coil form?? This seems like a
> fairly easy kit to put together on your own if you could solve this
> little mystery.
>
> Paul
> w9bbr
>
>
>
>
> Deane McIntyre <dmcintyr at UCALGARY.CA> wrote:
> Deane McIntyre wrote:
> >
> > On 27-Apr-04, at 8:52 AM, Richard Post wrote:
> >
> > > Came across the Heath full-page ad in a 1948 Radio-News
> magazine. Saw
> > > an entry for their three tube regenerative receiver. Was
> available in
> > > two versions. The AC version was three tubes including a
> rectifier
> > > (and power transformer. No AC-DC stuff from Heath!). The other
> version
> > > was battery operated and two tubes. Batteries also available
> from
> > > Heath. Showed a small pic of front panel with chassis. I assume
> the
> > > cabinet was available later as a separate purchase. Front panel
> was
> > > drilled with circular pattern of holes for speaker sound.
> Cosmetic
> > > appearance similar to their first generation test equipment such
> as a
> > > signal generator.
> > >
> > > Should be easy enough to clone the front panel. Anyone have one
> of
> > > these? Maybe provide a good image of the front panel and layout?
> > >
> >
> > The ninth edition of the Collins Radio Amateur's Handbook has a
> > detailed description of the AC
> > version of this radio, the model K-1 All Wave Beginner's Radio.
> > Included are the pictoral diagrams, parts list, schematic as well
> as a
> > good quality photo. Tubes used were two 12A6 (one with grids and
> plate
> > strapped together to serve as the rectifer) and one 12C8
> (detector).
> >
> > Will scan if anyone is interested.
>
> I have now scanned this section of the book and have placed it on
> my website as a PDF file (1.0 MB, 4 pages plus a high quality scan
> of the
> photo). I am also sending this to the Heath list in case anyone over
> there
> is intesested.
>
> http://deane.bio.ucalgary.ca/K-1.pdf
>
> The only detail lacking is the winding of the coils - these were
> prewound
> by Heath.
>
> >
> > 73,
> >
> > Deane McIntyre VE6BPO
> >
> > Deane at deane.bio.ucalgary.ca
> > http://deane.bio.ucalgary.ca
>
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Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

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This list is a public service of the City of Tempe, Arizona
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