Click here to make tpub.com your Home Page

Page Title: Transmitter Spurious Output Adjustments
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
   
   

 



TM 11-5820-509-35
CAUTION
(2) Connect the primary power source to the
Before making the following measurements
receiver-transmitter.
and  adjustments,  resonate  the  POWER
(3) Turn on the test equipment and place the
AMPLIFIER TUNE and POWER AMPLIFIER
POWER-LIGHTS switch on the RT-671/PRC-47 to
LOAD controls on the front of the receiver-
POWER ON. Permit the equipment to stabilize for at
transmitter for maximum deflection on the
least 5 minutes before beginning the procedures listed in
the chart below.
XMTR OUTPUT meter.  Use the OPR-TUNE
switch to control power amplifier plate power.
Do not permit the power amplifier to operate
c. Procedure.
for more than a few seconds at a time in the
(1) On  the  RT-671/PRC-47,  set  the
unloaded  condition,  serious  equipment
KILOCYCLES indicator to 2400; place the CW.
damage can result.
FSK/VOICE switch to VOICE, the XMTR PWR switch to
LO, and the OPR-TUNE switch to OPR.
(3) After resonating the power amplifier plate
(2) Place the turns-counters of POWER
circuit at the LO setting of XMTR PWR switch place the
AMPLIFIER TUNE and POWER AMPLIFIER LOAD
XMTR PWR switch to HI and peal these controls again.
controls to the settings recommended on the LOAD-
Immediately return the OPR-TUNE switch to OPR.
TUNE chart on the front of the receiver-transmitter.
Test
Radio
equipment
control
Test
Performance
Step
settings
settings
procedures
standards
1
Adjust audio oscillator to
Place OPR-TUNE switch to
Adjust input attenuator on
Set 1700 Hz level for later
1700 Hz and set output
TUNE.
spectrum analyzer so that
reference.
level to 0.1 volts.
1700 Hz tone is at 0 dB
reference level.
Not more than 6 dB from
2
Adjust audio oscillator to
Same as step 1.
Read amplitude of 300 Hz
1700 Hz value measured
300 Hz and set output
tone on spectrum analyzer.
in step 1.
level to 0.1 volts.
3
Adjust audio oscillator to
Same as step 1.
Read amplitude of 3000 Hz
Not more than 6 dB from
3000 Hz and set output
tone on spectrum
1700 Hz value
level to 0.1 volts.
analyzer.
measured in step 1.
5-7. Transmitter Spurious Output Adjustments
b. Test Conditions and Equipment Connections.
(1) Connect the test equipment to Radio Receiver-
Transmitter RT-671/PRC-47 as show' in figure 5-3. Do
a. Test Equipment and Material.
not connect the ME-26A/U until instructed to do so.
(1) Spectrum Analyzer AN/UPM-110
(2) Converter, Hewlett-Packard K15-8551B
(2) Connect the primary power source to the receiver-
(3) Dummy Load DA-75/U
transmitter.
(4) Attenuator (see figure 5-3)
(5) Audio mixer unit (see figure 5-3)
(3) Turn on the test equipment and place the POWER-
LIGHTS switch on the RT-671/PRC-4' to POWER ON.
(6) Multimeter ME-26A/U
Permit the equipment to stabilize for at least 5 minutes
(7) Audio Oscillator TS-382/U (2 required)
before beginning the procedures listed in the chart
(8) Primary power source; 115-volt, 400-Hz,
below.
single-phase, 3 amps.
5-4


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

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