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2
Models 423A/8410A
Table
1.
Specifications
\-l
Frequency
Range:
423A:
10
MHz
to
12.4
GHz.
84704:
10
MHz to
18
GHz (Below
I
GH4RF
may
leak
through
the
video output
connector. It
can
be
eliminated,
if
objectionable, with suitable
low
pass
filter.
)
Frequency
Response:x
423A: +0.2 dB/octave
10
MHz to
I
GHz;
*0.
5
dB
overall.
84?0.A: +0.2
dB/octave
l0
MHz
to
8
GHz;
t0,5
dB
to
12.4
GHz;
+1.0
dB
overall.
Maximum
Power:
100
mW,
peak
or
average.
Sensitivity:
High
Level:
< 0.35
mW
produces
100
mW
ou@ut.
Low
Level:
)
0.4
mVdc
/pW
CW.
Impedance:
50 ohms.
Refl
ection
Coeff
icient:
423.4'
and
84704:
10
MHz to
4.
5
GHz,
0.
091
(1.2
SWR);
4.5
GHz
to 7.0
GHz,
0.
15
(r.35
SWR);
7.0
GHz
to
12.4 GHz, 0.2 (t.
S SWR).
84?04': 12.4
GHz
to
18.0 GHz, 0.26
(1.
?
SWR).
Output
Impedance: <
15kO shunted
by
10
pF.
Connectors:
4234:
Option
01:
Matched
pair.
Frequency
response
characteristics (exclusive
of
basic sensitivity)
track within
+0.2 dB
per
octave
from
10
MEz
to
8
GHz,
t0.3
dB
from
8
to
L2.4 G[lz.
Option
02: Furnished with
matched
load
resistor
(11523A)
for
optimum
square law
characteristics
at
2
4"
C
(?5'
F;,
*
(
+0.
5
dB
variation from
squar.e
law
over a
range
of
at least
30
dB up
to
50
mV
peak output
working into
an
external
load
)
75k
ohms. Sensitivity typically
)
0,
I
mY /
pW
when
Ioad
resistor is used. Overall
tength
4-l/2
i\.
(144
mm).
Option
03:
Positive polarity
or/tput.
8470A:
Option
01:
Matched
pair.
Frequency
response
characteristics (exclusive of basic sensitivity)
track within t0.2
dB
per
octave
from
10
MHz
to
8 GHz,t0.3
dB
from 8
to
12.4 GHz,
*0.6
dB
from
12.4
to
18
GHz.
Option
02:
Furnished with
matched
load
resistor
(11523A)
for
optimum
square law
characteristics
at
24"
C
(?5
"F;,*
<
+0.5 dB
variationfrom
square
law over a
rillge
of
at
least
30 dB
up
to
50
mV
peak
output
working
into
an
exte
rnal
load
)
7
5kQ.
Sensitivity
typically
)0.L
mY/pW
when
load
resistor
is used.
Overall
length
4-L/2 n.
(144
mm).
Option
03:
Positive polarity
output.
Option 12: Furnished with stainless steel
type
N
male
connector.
Option
13:
F\rrnished
with stainless steel tlpe
N
female
connector.
Detector Element:
Supplied.
- replec
e
rn
enf
-a
s
se m
bl ie
s.
)
Output
Polarity:
Negative.
posftiGEfefify
units.
)
Noise: (200
pVp-p,
with
CW
applied
to
produce
J00-mVdc
output.
*As readon
a
meter calibrated
for
square-law
de-
tectors
(such as
HP
4158
SWR
Meter).
(Refer
to Table
2
for
(Refer
to
options
for
t
{
t
I
T
C
+
lO.
GElrllRAt.
11.
The
Crystal Detectorcanbeusedas
ademodulator
to
obtain
a
pulse envelope which can
then
be observed
on an oscilloscope.
It
can
also
be
used as a general
purpose
detector.
12.
When
using the
Crystal
Detector with
an
oscillo-
scope and
the
waveshapes
to
be observed have rise
times of lessthan
5
psec,
the coaxial
cable connecting
oscilloscope
and
detector
should
be
as short
as
possible
and
shunted
with a resistor. Ideally, this
resistor
should
be
50 ohms
to
terminate the coaxial
cable
properly.
However,
with
50ohms
resistance, possibly
the
output video
pulse maybe too small to drive
some
oscilloscopes. Therefore,
the
cable
should be
shunted
with
the
smallest
value
of
resistance that
will
obtain
suitable deflection
on
the oscilloscope; typically
the
value
will lie
between
50
and
2k
ohms.
The
larger
the
resistance
the
more
degradation
of rise time.
13. The power
applied to
the
Detector
can
be
either
modulated
or
continuous wave
(CW).
If
modulated at
a
1000-cps
rate,
the
sensitive
HP
Model 4l5B/E
can
be
used as
the
indicator.
For
CW
detection,
a
dc
milli-
ammeter
ormillivoltmeter
zuchasthe
HP
Model
425A
Microvolt-Ammeter
can
be
used as
the indicator.
14.
PEAK
POWER MEAST]REMENT.
15. The
arrangement
of
equipment
f
or
peak
power
measurement
is
shown
in
Figure
2.
The
procedure
involves calibration
of
an oscilloscope which in furn
is
used
to calibrate
a
CWgenerator.
The
outputof
the
calibrated CW generator
is
meazured
with a
poril/er
meter;
thepeak
power of
a
pulse istherebymeasured.
The
procedure
is
as
follows:
a.
Connect equipment
as
shown
in
Figure 2,
step
1.
b.
Observe
pulse
on
a
dc-coupled oscilloscope.
U
sing a
marking pencil,
mark
on
the
graticule
the
base
-
to-peak amplitude of
the pulse
envelope.
;!
4
t
{
I.
01613-8
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