Table of Contents
Advertisement
Model 415Е
transmission line as a shunt admittance which increases
(disturbing
the transmission line more)
as the probe
penetrates farther.
To find out whether a given probe
penetration
is too great or not,
measure
SWR,
then
change probe penetration and remeasure
SWR.
If the
second
reading
is different,
the probe
is penetrating
toofar and loading the transmission
line significantly.
3-22.
PROCEDURE.
3-23.
MODERATE
SWR.
The scales of the 415E are
calibrated for reading standing wave ratio directly from
the meter.
Set the slotted line probe ata voltage max-
imum
and adjust the gain of the 415E with the RANGE-
DB, GAIN, and VERNIER controls (EXPAND switch to
NORM) for
full scale deflection (1.0 оп the 1.0t04 SWR
Section III
Paragraphs 3-22 to 3-24
scale). Now move
the probe toward a minimum.
If the
meter drops below 3.2, rotate the RANGE- DB switch one
position clockwise and read on the 3.2to0 10 SWR scale.
Ifthe pointer drops below this scale, rotate RANGE-DB
Switch one more position clockwise and readonthe
1.0
to 4 scale and multiply by 10.
This pattern continues
for still higher SWR readings.
3-24.
The
DB
scales can be used for a standing wave
ratio measurement
by setting the 415E to full scale at
avoltage maximum, then turning the RANGE- DB switch
clockwise for anon scale reading ata voltage minimum
and
noting the difference in DB readingsat the maximum
and
minimum.
A DB
reading
is obtained
by
adding
RANGE-DB
switch setting and meter indication.
=
n ка 2.
i
Б Н
БЕЗБЕН
|
|
Қар БЕЛ ИНГ БЕ |
ЕН ЕЕ БА BE ES EE
I
[^
E
ина ва аш
иш
T]
3.0
SEE
É
—
ct
-
L
T
T
T
ІШ
4 tod
|
m
T
|
=]
——
|
СТ
|
LT
1
r
EE
ЕТ
ЕЕ
i
TH
7389
T
|
dm HH -
PE
H
-
|
E
25
|
+
iia
LL
1
кы
t-
——
t
+
і
i
|
|
I
E
НЕ
zd
sr
IET
Б ИЕ Es B
ТЕ
Creer +H- AmE
+:
|
|
|
IN
F ГІ
bs
ET
LLL
am
i
үү
É
СЕЕ
ЕЕРЕЕ
ian
2
| 1
о
20
Т
-
T
&
E
PIT
E S
Е
TT
a
I--—-
b
ul
p
--—-
1—1
>
я
|
Жж
|
PENES
*
o
m
T4
З
1
F
2
|
f o n t
1.
L
2
z
Li
Е
Ф
d
Ë
=
р.
i--H
Е
1.5
|
ыры
eb
|
mau LL
ШШ
рр!
|
|
|
|
z
4
-
|
!
|_|
ME
4
t+
|
=
1
1.
|
Ll
1
ИШИ
||
1.0
°
1
2
3
4
5
6
7
8
9
ю
DECIBELS
(SWR)
4ІБЕ-В-Ї
Figure 3-5.
Expanded Section of Figure 3-6
02152-2
3-5
Advertisement
Table of Contents
