Quantcast Operator's Preventive Maintenance Checks and Services Chart for Coupler, Antenna CU-2004/U

 

Click here to make tpub.com your Home Page

Page Title: Operator's Preventive Maintenance Checks and Services Chart for Coupler, Antenna CU-2004/U
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
Installation - TM-11-5820-554-120086
Up
TM-11-5820-554-12 Radio Set AN/FRC-93(V)1 AN/FRC-93(V)2 AN/FRC-93(V)3. AN/FRC-93(V)4 AN/FRC-93(V)5 AN/FRC-93(V)6 AN/FRC-93(V)7 Manual
Next
Figure 12-3. Antenna Coupler CU - 2004/U, schematic diagram.


TM 11-5820-554-12
p. As the transmitter frequency is moved about
m. If it is still impossible to obtain a unity swr,
in normal operating procedures, watch the swr, and
connect the antenna to the terminal marked SHUNT,
if it becomes excessive, begin the tuning procedures
and connect a jumper from the terminal marked
again.
SERIES to ground. Then repeat h, i, and k above at
q.  A combination of ANT OUTPUT C and
the same tune adjusting ANTENNA OUTPUT C
SERIES COIL settings may optimize the minimum
along with the controls in h and i above.
reflected  power  indication.
A  number  of
n. If a unity swr cannot be obtained with any of
combinations of settings of the above controls may
the above combinations, the antenna impedance is
produce resonance.  In general, the highest dial
probably beyond the range of the antenna coupler.
setting for ANT OUTPUT C producing resonance
However, the coupler should handle almost any
will produce the best results.
reasonable antenna with the exception of very short
r. Make a log of the settings for each frequency.
antennas  at  low  frequencies  (less  than  1/8
If there are no changes in the antenna system, it
wavelength below 7 MHz). Where unity swr cannot
should be possible to return to a given frequency by
be obtained, use the minimum Swr that can be
setting up the dial numbers without having to go
obtained. If the swr cannot be made less than 2.5 to
through the entire tuning procedure.
1, the antenna length should be either increased or
decreased until a better match can be made.
12-5. Operator's Maintenance
o. Note that on the higher frequencies (20 to 30
Instructions
MHz), the setting of the various controls becomes
quite critical. When tuning adjustments are made,
Operator's maintenance instructions are covered in
adjust the controls slowly so that the proper setting
paragraphs 3-19 through 3-22. Cleaning is covered
will not be passed over too quickly to be noticed.
12-6. Operator's Preventive Maintenance Checks and Services Chart for Coupler,
Antenna CU-2004/U
B-Before
Interval
Item
B
D
A
W
M
Item to be inspected
Procedure
Equipment is not
No.
ready/available if:
Rf connectors
Check for damage or corrosion.
Connectors cause SWR to be
unable to be corrected.
12-7. Organizational Maintenance Instructions
Organizational preventive maintenance instructions are covered in paragraphs 3-26, 3-26, and 3-27. Touchup painting is
covered in paragraph 3-29.
12-8. Organizational Preventive Maintenance Checks and Services Chart for Coupler,
Antenna CU-2004/U
W-Weekly
M-Monthly
Q-Quarterly
Interval
Item
W
M
Q
Item to be inspected
Procedure
No.
Tuning unit.
Terminate tuning unit in dummy load.  While
changing control settings observe VSWR. SWR
will remain constant. If not, check tuning unit
components.
Change 6 12-3


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

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