Radio Broadcast - 1925, February - 113 Pages ... - VacuumTubeEra

'
.
THIS
"Now, I Have Found. 713
JOINT
appear to be somewhat weak mechanically as
regards the adjustment of the tickler.
I have used two Crosley Varinds such as is
shown in Fig. 10 and while I have not a per-
FIG. 8
ANOTHER WAY OF WINDING THE
COILS FOR THE K. O. CRYSTAL
REFLEX RECEIVER
WINDING the Ti and T2 coils
used in
the RADIO BROADCAST Knockout
IN
crystal
reflex receiver, am I pleased to submit an
idea of my own for getting clear of the trouble
of supporting the leads for the primary, or
smaller winding.
First, wind the primary on a tube of the
proper size for the entire unit and bring out
the leads as shown at A, Fig. 9. This keeps
the primary winding tight. Next, place empire
cloth or any other form of insulation, on
each side of the primary to build up an even
layer as at B. Then put on a wider piece of
cloth the full width of the secondary coil as
at C. Next, wind the secondary and bring
out the leads as for the primary as shown at
D. The result is a smooth layer of wire with
no leads shown. The main point
is that all
the coils are tight. This system is better
than when the primary coil is wound on top
of the secondary. \V. A. WHST, Hopewell,
N. S.
USING STANDARD COILS IN THE
ROBERTS CIRCUIT
HERE is a suggestion that might be of
interest to your readers. Most of the
ready-made coils for the Roberts circuit
are rather costlv and in some instances
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FIG.