Evening public ledger. [volume] (Philadelphia [Pa.]) 1914-1942, 1922-05-02
How to Operate the Regenerative Single Circuit

Tho hook .up given in the last article
!. not n difficult one to operate. In
s..t n ia so much simpler than most
.%Sst hat tho majority of the sets you buy
assembled in small cabinets use 1t or
.scmething very like it. And its efi-
cheney is remarkable. ..-
II you ave using loose coupler or
voriocoupler. you will have some
r,sons Of varying the number Of turns
~ wire YOU employ on the primary coil.
II will be BY means of a slider or Il
switch blndc which rotates over semi
c;rcle Of brass or nickle points, each
one Of which connects up an extra Sec
tion Of the coil. -, n.
With the average amateur aerial, 1t
Ia host 10 begin with about twenty turns
~ wire on a four. inch diameter coil II
vou want to receive the broadcastins
stations.
You have two adjustments then to
makc--turning the knob OF the varia..
bic condenser slowly all the way around
the scale and back two or three times.
- the same time performing the same
"neration with the rotor" If it's a
vsriocouplcr or drawing the inner coil
~ a loose coupler out all the way and
nushing IL back. In this way you
HfeeT' around for all possible combina-
tions Of adjustments. II you are using
the usual loose coupler. you will also
have to vary the switch point on the
inner coil, ordinarily using about two
thirds as many turns Of wire on the
inner coil as on the primary. This
inner coil. as we have explained, Is
usually used as the secondary" but.
with this particular hook-up, it becomes
the "tickler."
II this brings YOU no signals. move
the primary switch over to the next
"ten' point and repeat the process until
YOU finally hear the signal you arc
searching for. Then slightly move
the condenser knob until it comes
In strongest. then the same thing
with the rotor or the movement OF.
the inside coil In and out and then
very slowly and carefully try just a
tiny bit more current in your bulb BY
moving the knob Of tue rheOstate. DO
this with the utmost care and the
moment you detect n sound Of distortion
or clicking or moaning or bowling. turn
tAe knob bnck bit, for that sound is
3 warning that you arc putting dan
serous amount Of current into your
bulb
y II Is always best TO usc the least
amount Of filimcnt current that will
give you satisfactory signals. Never
push n bulb to the limit. 1t will
shorten its life IL. indeed, it doesn't
burn II out completely.
II YOU arc using honeycomb coils in
this circuit. You will find the best re-
suits for 600 meters with the coil known
in the trade as 81 $50" as the pri-
mary and ~ 400' as the tickler and.
for the shorter waves 81 400" rs the
primary and ~ POO" as the ticker.
With the home made spider web or
basket woven coils. the primary for
tho broadcasting stations should have
about sixty or seventy turns with the
usual amateur aerial and. oddly enough.
! have found that the ticker that gives
hest results is one with between 100
and 1lO turns. These are coils wound
around hub two inches in diameter.
NO definite number can be given, how.
ever, as conditions will vary greatly
with different localities.
II yon are going TO use these spider
web coils land they are very efficient
and lots of fun to makc) I strongly ad.
wise making both of 10 turns, tapping
cach single turn Of the inside ten and
cach ten OF the rest. This will give
you varlocouplcr that is good for
nearly 1000 meters with a 1OO.foot
single wire aerial at the average height.
Later We will show how these coils
are made and tapped and used. But
aoht attempt to tap them until you
nave learned to solder and have an
outfit.