Quantcast Alignment of Second Oscillator

 

Click here to make tpub.com your Home Page

Page Title: Alignment of Second Oscillator
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Back
Preliminary Test Setup.
Up
TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
Next
Alignment of 3.0- to 3.9-Mc If. Subunit


are the same. Set the front-panel
131. Alignment of Second Oscillator
controls as follows:
a. Test Equipment and Tool Required.
(1) Multimeter ME-26/U.
Setting
Control
(2) Alignment tool.
b. Test Setup.
MANUAL
CHAN SEL
(1) Perform the alignment test setup
SQUELCH
OFF
VOLUME
Fully to the right
(2) Set Multimeter ME-26/U to the
POWER
Turn to ON, momentarily
-3 volt dc range and connect the
dc probe to test point J305 (fig.
(2) Set the controls of Radio Set Con-
trol C-1439/U as follows:
c. Procedure.
(1) Set MANUAL FREQUENCY UNITS
control to 9.
Control
Setting
Warning: The capacitor C340
SQUELCH
OFF
trimmer shaft is at B+ potential.
PHONE VOLUME and
Fully to the right
SPEAKER VOLUME
Avoid direct contact with shaft. Do
not short shaft to ground.
Radio-interphone
RAD
Perform procedures (2) and (3)
Note.
C a u t i o n : Do not key the transmitter unless the
below only when this subunit has been
ANT. jack is terminated in a proper load (either the
severely  misaligned.
a n t e n n a or Radio Frequency Wattmeter AN/URM-
43A). Do not key the transmitter with a signal gen-
(2) Turn trimmer capacitor C340 (fig.
erator connected to the ANT. jack. Failure to ob-
62) clockwise to its stop; then tune
s e r v e these precautions will result in damage to
i t counterclockwise seven com-
the rt unit and to the test equipment.
plete turns.
Note. Allow at least 5 minutes for the radio set to warm up before
performing any alignment procedures.
(3) Adjust the slug of L310 (fig. 113)
so that the top of the slug is approx-
imately 1 inch from the top of the
130. Third Oscillator Check
tank compartment cover.
(4) Set the MANUAL FREQUENCY
Perform the following procedure before
UNITS control to 0.
aligning the if. amplifier subunits. If the
(5) Tune L310 for a maximum indi-
third oscillator does not meet the speci-
cation on the ME-26/U.
fications below, check V401B and make
(6) Set the MANUAL FREQUENCY
voltage and resistance measurements to
UNITS control to 9.
isolate the trouble (fig. 87).
(7) Tune C340 for a maxium indication
a. Test Equipment Required. M u l t i -
on the ME-26/U.
meter ME-26/U.
(8) Set the MANUAL FREQUENCY
b. Test Setup.
UNITS control to 0.
(1) Perform the alignment test setup
(9) Tune L310 for a maximum indica-
tion on the ME-26/U.
(2) Set the ME-26/U to the -10-volt
(10) Repeat procedures (6) through (9)
dc range and connect the dc probe
above until no further increase in
to test point J404 (fig. 56).
the voltage indication on the ME-
c. Procedure. Operate MANUAL FRE-
26/U can be obtained.
QUENCY TENTHS control from 0.0 to
(11) Set the MANUAL FREQUENCY
0.9. At each position, check the Multi-
UNITS control to positions 0
meter ME-26/U indication on receive and
through 9 and see that the voltage
transmit. The meter indication should be
at test point J305 is not less than
between 5 and 12 volts dc on both trans-
1.0 volt for each position.
mit and receive.


Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business