Shoshone journal., 1924-03-28
BY ARTHUR II. EDDY

DJ an n IN n. EDDH
III you engage yourself In conyersa
tion with the average amateur con
cerning his radio receiving set it will
not be long before he will bring up the
question Of maximum range of re-
ception, which would be the para
mount topic of discussion. 1t is thus
that we have grown into the habit of
Judging the relative merit of a re-
celying set by the range that 1t can
cover, and although this method of
Judgment is not altogether fair and
just to all types of outfits, yet for the
average beginner or radio expert
menter 1t does form a good basis of
quality. The standard range of the
regenerative receiver is quite an IN
known quantity, for amateurs and ex-
perts having almost identical circuits
and antenna conditions give very con-
hicting claims. But still, If we are
to base most Of our claims on dis
tance, on everyday possibility of re-
celving certain broadcasting sta
hon, 1t would be very near the truth
If we should limit the regeneratiye re-
celver to approximately range of 100
miles when using a rather sensitive
detector tube.
MOST amateurs realizing this have
endeavored to augment this distance
by the use of a combination of audio
and radio frequency amplifers-in
other words, the reflex circuit. With
the former type success was assured
where the sensitivlty of the detector
was great enough to detect the signal
Dut since the sensitive tube must be q
soft tube-that Is, a tube that hIsses
at a critical point-the number of
audio frequency stages is somewhat
limited. To adapt radio frequency
implncatlon to a. regenerative re-
,elver after once 1t has been con-
'tructed Is by no means an easy task
Yet some amateurs have not only ec- Z
'omplished this, but have obtained re- :
results.
FOR the vast majority of beginners r
ne true answer to the problem of r
long distance receiver Is NOT r
ne regenerative receiver with aud,o
nd radio frequency amplifiers nor the =
receiver but q 70
ever which is combination Of audio h
no radio frequency units in the cir z
uit. This type Of circuit will not only o.
ave the desired range, but will be So q
ompact that 1t will be readily mort n
ole and so simple and efficient in its II
Der6tion that the beginner can onar- te
'e 1t as satisfactorily as the expert. bl
henex Is not new, but IS USUALLY fc
escriDed In peculiar ways with or
ocular names. This Is at once nm IN
idence or evasion, for the simnle
ason that at the end of the story
e whole thing Will be found 70 no -
e original reflex circuit - -
A reflex set can be made from -
lgle tube and crystal detector. the a.,
igle tube serving for both audlo -, 49,
d radio frequency amplification. II -.
Is desired 10 operate a loud speaker ~S
must resort 10 two or three tube o. o.
lex circuit. Here the first two tubes "
We as radio ampliners and audio am
ners, with the crystal as deteetor "a
2 s1lsmstic diagram shows mum. ~
OF fwofube reflex circuits. pN
: ampiifer tubes are used IN al ~
ges the b battery should be renl. -
I'd 80 that the proper y battery -
tage u applied 10 their resneofive ~
tes This Is accomplished by os.
lmenf Usually between forts ave ,'
seventy volts are found bosf for ~
plate voltage /"
? ile actual ppplicauou ~ fho ala. ..l, M
p iNrif ole soferm alMounlos AZ LII
pie''o'ne 1he uDoa. nod Inatancs
y NN coupled f0l BON ndl0 nna an' Il"
''fNnfl HlHpIlNai|on huf plal.ns +"
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f''if laNN llNquNNl nHunaiaAro ih
Nf ilf HlNlNa WI M .eanaas .oa
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p N'i4'Nif NiuNN fflM D0.i ~,
fN 'iHIN ilN "a lNnIl00r. n Nm.
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