Evening star., 1924-04-25

At this time there seems to be,
and rightly so, considerable agitation
reg arding what is to be done about
the annoyance caused by the use of
regenerative sets that radiate energy
into the ether and produce whistling
interference in neighboring receivers.
Many suggestions have been
brought forward with the purpose
of doing something to curb the
nuisance. Some "fxers" have taken
the usual beaten path and have sug
sested that legislation be enacted
prohibiting the use of receivers that
are capable of radiating energy caus-
ing this type of interference.
1t Is now generally conceded that
1t is practically impossible to enforce
| Legislation that in it's very nature
is une:forcsable. In view OF the large
number OF such receivers that are
now in use and the number of vari-
Gus types of experimental circuits
which use that principle as the basis,
such legislation would work consid-
erabie hardship on those whose re-
ceivers are OF that type. and the in
diCaGouS are that such legislation
could not be enforced even though
IL were passed
To scrap the large number Of such
receiving sets that are now in use
or to require that costly additions
be used in connection with the sets
to eliminate the nuisance Is unthink-
able. To enforce such legislation by
special or constant inspection oil
the more than 100000 receivers
which are now estimated to be in
use. would tax limited governmental
resources available for such a pur-
pose.
Fortunately there is a way out OF
| the trouble without the necessity OF
| enacting legislation or using violence
on the culprit who causes such in
terference.
To a great extent the nuisance
is due to careleSsneSS. thoughueSS-
ness or ignorance, These causes can
be eliminated by patient missionary
and education work
The radio fan who causes such in
! reference does so because he does
not know how TO operate his receiver
To begin with, let US consider the
relative capabilities Of so-called
single circuit and double-circuit re-
generative receivers in causing such
troubles. The great majority of the
denunciations hurled at the receivers
| causing such interference have beer
directed at the single-circuit receiver
Fans who are using single-circuit re-
ceivers have been advised on every
side to change the set over to dou-
ble-circuit sets. 1t is definitely
known that the greatest trouble OF
| some receiver is being tuned. Once
the receiver is tuned properly, nc
interference is experienced in neigh
| boring sets. 1t is also known thai
it takes a more experienced operator
to tune a double-Circuit set than ii
does to tune a Single-cirouit set II
also takes moro time to tune a. double
circuit set than it does to tune a
single-circuit one. When properly
operated, the dCuble-circuit arrange
ment, If allowed to oScillate as it is
tuned, can cause more trouble than
| a single-circuit set. The longer time
that 1t takes to adjust it and the
always-present possibility that it is
not adjusted to the best point for
loudest reception is constan,
temptation to the operator to fiddle
with the controls.
In the single-circuit type OF set the
number of controls is limited to a
creator extent, and the Critical" con
trolls, which set the receiver into oS-
cillation, are at most only three
the tuning condenser. the reg enerative