Table of Contents
Advertisement
ntj-oi lo-io/i l-
in
i.x.^^1^1 i u.ik
MAIN 1 £. NANCE
3.
Programmable Loop Alignment
a.
Connect the Digital Voltmeter to test point E3.
b.
Tune the receiver to 00.00499 MHz.
c.
Insert an alignment tool in the VCO shield opening
and spread or squeeze the turns of L8 until a
Voltmeter reading of +4.0 Vdc is observed with the
alignment tool withdrawn from the VCO shield.
4.
Output Loop Alignment
a.
Connect the Digital Voltmeter to test point E2.
b.
Tune receiver to 00.00499 MHz.
c.
Adjust capacitor C61 until a Voltmeter reading of
+3.0 Vdc
is observed with the alignment tool
withdrawn from the VCO shield.
d.
Using the Frequency Counter, verify that a
frequency of 32.205010 MHz +/- 3 Hz is present at
output pin B15.
5.
Final Adjustments
a.
Deenergize the receiver.
b.
Remove the 2nd LO Synthesizer board from the
extender card and return it to the receiver.
c.
Mount the top protective cover on the receiver
(use only four fasteners to secure the top cover).
d.
Energize the receiver and allow it to operate for a
minimum of 30 minutes.
e.
Tune the receiver to 00.00499 MHz.
f.
With the receiver in operation, remove the bottom
protective cover.
g.
Using the Digital Voltmeter, check the Loop Test
Point Voltages as indicated in Table 4-39.
4-61
Advertisement
Chapters
Table of Contents
