Wavetek 3000 - Page 68

PERFORMANCE TESTS
METHOD
EQUIPMENT
Spectrum Analyzer
WidebandAmplifier
50 ohm Load
LoopProbe
Attenuator Pads
(100 dB)
PROCEDURE
A 50 ohm receiver consisting
of a 26 dB amplifier
and a spec-
trum analyzer are
calibrated at a 1 pV level
using the Sig-
nal Generator . A loop probe
is then connected to the
receiver
and the leakage is measured at
a one-inch distance
from the
externalsurfaces of the
Signal Generatorwith the
RF out-
put terminated in 50 ohms .
A screen room may be
required
for this
measurement .
HP8544L/8552B/141T
HP3447D
HP11593A
See Figure 4-9
Weinschel 50-10, 50-20,
50-30, 50-40
1 . Set the
Signal Generator controls as
follows :
FREQUENCYselector

500 .000 MHz
MODULATION MODE

CW
MODULATION FREQ

(Inactive)
MODULATION FM/AM

(Inactive)
OUTPUT VERNIER

Set to +3 dBm on
OUTPUTmeter
OUTPUT
step attenuator

-110dBm
Figure 4-9
. Loop Probe
1 .
Rexolite
Rod :

1 .25 in . dia . b y
11 in .
2 . Hole : 1 .00 in dia . by 0 .80 in .
deep .
3
. Groove :

0 .120 in . wide by 0 .125
in deep
1 .00
in
from end of rod .
4 .
Coaxial Cable : (RG-174/U)
0 .110"
diameterby
19" long . Strip
shield
for 7 in, and cut off
shield to 1
in length .

Strip
in-
sulation
from center
conductor
in .
Wind 2 turns of
insulated
center
conductor in groove
of
rod .

Solder
shield to center con-
ductor, and
insulate the solder
joint .
5 . Wind mylar
tape around the
two-
turn loop, and
around the rod
(three places) .
6 . BNC male
connector .