APQ-56 SERVICE NOTES #5 12 MARCH 1957 AN/APQ-56 TIME SHARED SYSTEM R-F SWITCH PHASING PROCEDURE

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP89B00487R000300610002-4
• Release Decision: RIFPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: August 9, 2011
• Sequence Number: 2
• Publication Date: March 12, 1957
• Content Type: REPORT

Approved For Release 2011/08/09: CIA-RDP89B00487R000300610002-4
CONFIDENTIAL
APQ-56 SERVICE NOTES
#5
12 MARCH 1957
AN/APQ-56 TIME SHARED SYSTEM
R-F SWITCH PHASING PROCEDURE
1. Before attempting to phase the RF Switch,determine by means of a dry cell
battery the direction that the electron beam in the CRT of the oscilloscope
is deflected when a positive voltage is applied to the horizontal sweep
input, also, the vertical input. Figure 2 gives the various configurations
obtainable on the oscilloscope, depending on the positive direction of
deflection.
2. With the R-F Switch connected normally into system, crystal mount attached
to the right waveguide on the R-F Switch, and test equipment connected as
shown in Figure 1; place radar set into Stand-By operation. Assuming the
positive deflection is upward and to the right, the oscilloscope display
should be similar to Figure 2a. The distance between points "a" and "b" on
the curve depends on the angular displacement of the rotating disc with
respect to the zero point on the switch signal sine wave. Proper phasing is
obtained when the distance between "a" and "btt is approximately 17 percent of
the total length of the oscilloscope display and a slight pressure applied
to the end of the rotating shaft causes the two points to move closer
together. If the two points "a" and "b" move farther apart, phasing is wrong.
Loosening the two set screws in the hub of the larger gear allows proper
phasing to be obtained by allowing the gear to be rotated to the correct
position on the shaft. If the positive deflection is upward and to the right
and the oscilloscope presentation is as shown in Figure 2b, the larger gear
should-be rotated approximately 90 degrees for correct positioning. Several
tries may be necessary before proper phasing is obtained.
3. Pressurize switch to ).0 PSIG and check for air leaks.
Symptom Probable Cause and Correction
R/T Unit
Magnetron cathode out of center. The following
is a recentering method for !00 Magnetrons--
3.10 For all radar sets using NOTE: This is a last ditch approach to in-
Type 1100 magnetronse crease power, use only after all other attempts
Magnetron power output have failed:
low (under 14 watts average).
tv; ~' '-~
1. Place R-F Head up-side-down on a bench and
connect up for R-F power measurement.
2. Make the two plates shown in Figure 3.
Material to be 1/8" TK stainless steel
or brass plate.
3. Position the plates between the maggie
case bolt and the potting compound as
shown in Figure 4. Install a *- 20 bolt
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CONFIDENTIAL
!1.
5.
4x20
TAP
Figure 3
(blunt point) through the threaded hole
in the rectangular plate and into the
countersunk hole in the triangular plate.
Position this fixture laterally until the
triangular plate makes contact with only
the potting compound (triangular area
below the center of the magnetron).
Place radar set in RUN operation.
6. While closely watching the power output
meter, slowly apply pressure to the
potting compound by tightening the bolt
until the power output is maximized.
CAUTION- Use a non-magnetic screwdriver
with extreme care when making this
adjustment.
Figure !t
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CONFIDENTIAL
Approved For Release 2011/08/09: CIA-RDP89B00487R000300610002-4