Quantcast Figure 4-9. 19.45 MHz Adjustment Setup #1 (1A4A3)

 

Click here to make tpub.com your Home Page

Page Title: Figure 4-9. 19.45 MHz Adjustment Setup #1 (1A4A3)
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
Receiver-Transmitter RT-1277/URC-92 Adjustments.
Up
TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
Next
Figure 4-11. 19.45 MHz Adjustment Setup #3 (1A4A3)


TM 11-5820-873-34
(a) Connect VTVM between 1A4A2-TP3 and
ground.
NOTE
The  following  two  steps  involve  two
interacting components.  Due to this, the
adjustments should be worked together for
the desired output.
(b) Set 100 Hz, 1 KHz and 10 KHz to 5 Adjust
1A4A2L3 for a VTVM indication of 1 95 VAC 0 25 VAC.
(c) Set 10 KHz to 0 Adjust 1A4A2C8 for a
VTVM indication of 1.95 VAC 0.25 VAC.
(3) Remove card extender and reinstall Low Digit
Figure 4-9. 19.45 MHz Adjustment Setup #1 (1A4A3)
Generator CCA 1A4A2. Reinstall Synthesizer protective
NOTE
cover. Reinstall receiver-transmitter top cover. Remove
As adjustment progresses in the following
dummy load.
step, reduce signal generator output level to
c. Translator 1A4A3 Adjustment.
maintain VTVM indication below 100 mV
(1)  Remove  receiver-transmitter  top  cover
Remove Synthesizer protective cover. Place Translator
RMS.
1A4A3 on card extender. Connect a 50 ohm dummy load
(b) Using frequency counter, set signal
to receiver-transmitter ANT jack.
generator for 19 45 MHz Set signal generator level to 250
(2) 21 MHz Adjustment (1A4A3).
mV RMS Adjust 1A4A3L3 and 1A4A3L5 for maximum
(a) Connect oscilloscope to 1A4A3-TP4. Set
VTVM indication.
front panel VFO PULL control to in position.
(c) Connect signal generator as shown in
(b) Adjust 1A4A3-L13 for maximum output.
Figure 4-10.
Minimum acceptable output is 800 mV peak-to-peak at a
0.0476 usec repetition rate.
(3) VFO Adjustment
(a) Connect oscilloscope to 1A4A3-TP4.
Connect frequency counter to oscilloscope vertical
amplitude output. Connect VTVM (AC) between 1A4A3-A
and ground. Pull VFO PULL control to its out position.
(b) Rotate VFO PULL control for a VTVM
indication of 7.6 VDC. Observe oscilloscope and adjust
1A4A3L23 until an oscillation is indicated on the scope.
(c) Continue to adjust L23 in the same
direction and note adjustment range until oscillation stops.
Adjust  L23  to  approximate  midpoint  of  available
Figure 4-10. 19.45MHz Adjustment Setup #2(1A4A3)
adjustment range.
NOTE
NOTE
The  following  adjustment  involves  two
If  the  following  indication  cannot  be
interacting  components.
Due  to  this
achieved, a slight readjustment of L23 is
interaction,  the  adjustment  of  each
acceptable to obtain the correct frequency
component  should  be  repeated  until
count.
maximum output is obtained.
(d) Adjust 1A4A3L22 for a frequency counter
NOTE
indication of 21 MHz 100 Hz.  Oscilloscope should
As adjustment progresses in the following
indicate a minimum sine wave of 700 mV peak to peak.
step, reduce signal generator output level to
(4) 19.45 MHz Adjustment (1A4A3)
maintain RF voltmeter indication below 100
(a) Remove Low Digit Generator CCA 1A4A2.
mV RMS.
Connect VTVM (AC) 1A4A3U3-6. Jumper 1A4A3U1-2 to
(d) Adjust 1A4A3L2 and then 1A4A3L3 for
CCA ground.  Connect signal generator as shown in
maximum VTVM indication.
Figure 4-9.
(e) Connect signal generator as shown in
Figure 4-11.
4-40


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

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