•
•
A Test
For The
Unit
BY BYRON E. F
ORTNER
*.
W9FYM
OR
wr
F
popularit
six
At
not
na
lly designed
miller.Th
the test
to
de
very easi ly.
mitter
meter
the
hing
scr
th
itten
y
pre
is
unit
ibe it and s
e past several y
abo
and pre
of
bands.
know
e
this fine
sent time . nothing has be
author
and
ut the T-23
sent
tr
n
to
of
tune
it
the test unit
up the T
is the
is the
ho
w
ears.ar
/AR
articl
ansmitter
·23
fortunate
th
purp
at
ose of this article
it c
an
es
ticles have been
C-S v.h.I. tr
atte
on
that
/A
be
st to t
the
RC·j trans-
po
two
en
was
duplicat
said
ssess
an
s-
he
and
or
origi-
or
of
ed
in a
foll
PL
facing the viewer.
ea
finds the
1625 oscilla tor
circuit of
shunted
in the
homebrew
ow
-152
Fi
ch
In switch positi
ed.
ar
gur
e 2 gives the loc
po
sition
across
grid cir
Th
e
sho
me
ter
th
e 1625 .
unit t
e conn ecti
wn wit h the o utside of
of
the test switch. Switch position I
located
and
R:m:,•. In
cu
it
he
shunted acros s R:
on
th
of
color
on
s to
ation
in the grid circuit
2
th
e m
e first h
po
the 832 sec
codi
of
eter
armon
siti
on
th
ng need n
e fem ale
th
th
e test unit in
lll:!.
is in the
ic gene
3 the m
ond
h
ar
ot
e plug
of
ra
eter
m
be
plug
the
grid
to
r,
is
onic
Th
Co
ern-Electri
a fun
bring
cuit
com
the case . T
and
Onthe
of
they
e test unit is kn
rps
readin
Te
st Unit 1-155-A and was bui ll by West-
ction
the
being te
partment
2"
are
met
deep
bott
gs for the BC-9
as foll
own
c.
It
co
nsists of an 0-1
switch and appropriate resistors to
er
sted
he
.
in the
. A tuning stick is
with a sliding
ca se
om
ow
of
s:
mea
the unit will be f
as
th
proper
cover
sures
50
·A
e U.S. A
rn
a met er wi
r
ange
included
on one
7"
long.
tr
an
smitt
rm
for
4"
ound
y Signal
the cir-
end
wide,
a set
er
th
in a
of
and
gene
the meter is n
final
in
er
v
amplifi er.
ment
negative side
ra
to
r. shunted
am
po
siti
sed and is no w in the ca t
For
voltage.
plifier. shu
on
switch pos ition 6 the
5 the pol
It
is shunted
The
of
If. in so me in
g
ro
le
unded.
ad
s within
th
e meter
the
.
n u
R 3 11. However,
th
de
ss R:
F
or
e meter is
of
lI
is
po
siti
the 832 final
:,. and C:I:!I.
reading
ow
across
in the grid circuit of the 832
nt
ed
arit
R:
across
y of
ho
ac
ro
meter
T·231ARC·5 used here has
the filament voltage grounded.
st
all
te
ation
will n
st
unit for
s. the
ot
re
po
sitive side is
ad
. Reversing t
po
sition 6
sho
on
f
uld
re
ila-
th
he
4
-
e
SI1
P
os
'itc!t
iti
on
I
2
3
4
5
6
7
F
un
ction
Osc. G rid C
Ist. H
Znd. H·G G rid Cu
R-F
R-F Amp.
Heater Voltage
Pl
ate
-G
Amp.Gr
Voltage
urr
Grid
Ca
ent
C
ur
id Current
th.
Curre
rent
rr
ent
nt
Operating
Ranl:
42525-90
20
40
54
53-55
l'
70
90
-80
-55
co
rrect
th
e plate voltage.
Th
a st
udy
th
e p
is takes
of
the
ro
blem. Positi
care
diagram
of
th
on
e Test Unit I
s will
7 the meier re
sho
w th
-I
55- A and
at
the unit
ads
Nothing
and
with the T-23
sa
for
5
reading
mitter
AN
be
loca lity.
since the te
me readings c
m
ax
imum
was
TENNA
give n as used with a
used
with
and
is kn
totune
C
OUPLI
Figure I s
own
st
/A
the R
for
ho
RC-5 also. it is assu
an
in
po
increase in
NG. Later a set
ws the schematic of the test unit.
ofthe
unit
also
sition s I. 2. 3. and
th
.F.AMP
was desig
be
e final.
BC-950
used.
tunin
. T
UNING
reading
tran
·A
ne
The
of
smitter
tr
an
smitt
d to be used
med
au
-t
g f
or
on
s with
readings will
that t
thor
oPositi
a
the tr
in this
tun
dip
an
er
he
ed
on
in
s-
the
Thecol
· R. F.D. 10. Box
42
or c
• CQ •
oJi
ng of the ca tlle is s
4116
Indiana
Janua
po
lis 1
ry, 1965
9,
hown
Indian
. H
a.
ow
ev
er,
u. S. Army Sig nal
Corp
, T
est
,t
Un
ick.
it 1-155 -A with
tuning
R
.)OI
l625
oee,
t---",.
'-,
.
--,
1
,
--
1625
,--
R
••
•
rl
832
, I
-
'-
-
.,o.
--
e !
• •
--
•
\-
..,
,
,
"
.,
..
• •
r.
,
•
• 7
"
fig. 2-
is quite simple. For
hornebrew unit: it is fell that p
are not needed although. if available. should be
used. The main thing to remember is that the
readings
th
e transm
Tune the
use the
and loading the final.
are
grid circuits for maximum readings and
cathode current position
re
lative and will vary according to
itt
er and activity of the crys
Tes
t points on the T.23
th
ose who plan to build a
re
/A
RC-5. N
cision resisto
ta
l used.
(5)
for tuning
rs
umbers
correspond to test swilch
po
sitions.
The following set
were found on the
tuned 10 145.3 me. at the
SU'
Plate voltage
Plate vol tage on the 2
oPas, Rdg.
I
• • • • • • • • • •
2
4
• • • • • • • • • •
3
• • • • • • • • • •
• • • • • • • • • •
on
the lsI. 1625
of
T-23/ARC~
15
56
47
16
nd
read
QTH
Sw. Pos.
in
gs are those that
5
6
7
. 1625
5
of KN9WEI.
• • • • • • • • • •
• • • • • • • • • •
• • • • • • • • • •
transmitter
Rdg.
.400
400V
59
46
40
V
Th
e inside of the test unit.
•
Plate voltage on
Plate
voltage
on
th
e 1s
the Final 832 .4IOV
t.
832 3
90
V
po~-!52
~
• •
,,~
~
..
-
-
•
'.
~
~
A)30
..,.
t'
-
'.
,
~
,
•
t'
•
s,
,
...
Test unit in conjunction with the Y
-2
31
AR
C-5.
-'(
fig. 1
PL
·152
¥.r
meier has an
-e
wott units.
i
rcu
plug.
-
0'"
il of
Th
e 1 m
All
intern
equiv
• •
~
•
..
.
~
-
~
~
C-J
Ih
e lesl unil showing
eg
other resistors are 1 walt 1% .
al resislance of
ale
nt 10 a Weston 301 .
resistor consish of four 250K
150
.
JJl
CJ
ccnnecticn
ohms
....
and
s to
The
is
A new
lishin g Corp. This new book is
"Surplu
s Conversion H
andbook"
50
pages larger than the old " Command
is now available from
Cowa
n Pub-
Sets" and includes most of the popular Command Set articles in addition
to
other conversion features. Order your copy soon.
Ja
nuary,
1965
• CO •
43
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