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Page 2
1. GENERAL INFORMATION
2. The Hewlett-Packard Model 11694A 50-7511
matching transformer is an accessory that adapts
50-0hm impedances to 75-0hni impedances. This
manual explains how to use the transformer and
briefly describes tests that can be used to verify
the transformer specifications.
3. On the rear cover of this manual, below the
manual part number, is a "Microfiche" part number.
This number may be used to order a 4- x 6-inch
microfilm transparency of the manual.
4. Specifications
5. The matching transformer specifications are
listed in Table 1. These specifications are the
performance standards or limits against which
the transformer may be tested.
Table 1. Specifications
Frequency Range:
Insertion Loss:
3 to 500MHz
(usable to 1 GHz)
0.6dB
(typ. 0.9 dB from 0.5-1 GHz)
Maximum Input Power: 0.5 watts
VSWR:
Connector
son
end:
Connector
7
sn
end:
Dimensions:
Weight:
Shipping Weight:
6. Description
1.3 (3 MHz to 10 MHz)
1.2 (10
MHz
to 500 MHz)
(typ. 1.2 from 0.5·1 GHz)
Type
BNC male
Type
BNCJemale
L,
2.25 in. (57,2mm)
D,
0.625 in. (15,9mm)
1
oz (28 gm)
9 oz (255 gm)
7. The matching transformer adapts a 50-0hm
coaxial line to a 75-0hm line. Impedance change
is accomplished by transformer coupling. The
primary winding of the transformer is 50 Ohms
impedance and the secondary winding is 75 Ohms.
(See Figure 1.)
Z=50n
11694A
-
-
·-
-
Model 11694A
Z=75n
Figure 1. Model 11694A Schematic
8. INSTALLATION
Do not exceed maximum input power of
0.5 watts or damage to the transformer
windings may occur.
9. Initial Inspection
10. Inspect the shipping container for damage.
If
the shipping container or cushioning material
is damaged, it should be kept until the contents
of the shipment have been checked for complete-
ness and the transformer has been checked mechani-
cally and electrically. The contents of the shipment
should be as shown on the front cover of this
manual, and procedures for checking elect:ical
performance are given under PERFORMANCE
TESTS. If the contents are incomplete, if there
is mechanical damage or defect, or if the trans-
former does not pass the electrical performance
test, notify the nearest Hewlett-Packard office.
If the shipping container is damaged, or the
cushioning material shows signs of stress, notify
the carrier as well as the Hewlett-Packard office.
Keep the shipping materials for carrier's inspection.
The HP office will arrange for repair or replacement
without waiting for claim settlement.
11. Storage and Shipment
12. Environment. The matching transfonner should
be stored in a clean, dry environment. The following
environmental limitations apply to both storage
and shipment:
a.
Temperature: -40° to +75°C
b.
Humidity:
<953 relative
c.
Altitude: <25,000 feet
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