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Message |
    
307
| | Posted on Thursday, November 29, 2001 - 8:19 pm: | 
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Galaxy Melaka Receiver Alignment:
Required Test Equipment:
a. Signal Generator , calibrated output with adjustable modulation.
b. AF VTVM (5v full scale range) or Oscilloscope.
c. DC Voltmeter.
d. Optional FM signal Generator.
SETTINGS: Clarify to 12:00 position , Channel 19 regular CB band , Mode:AM , RF Gain clockwise , Squelch Off.
1)Set Signal Generator for 27.1850 Mhz signal , 1 uV RF , 30% Modulation at 1 Khz. as shown in Picture #1 and #2. Inject into Antenna Jack.
Picture #1
Picture #2
2)Connect Oscilloscope or AF VTVM to speaker as shown in Picture #3.
Picture #3
3)Adjust volume so you can see a nice shaped pattern on the Oscilloscope or adjust the VTVM for a stable reading then adjust L12 , L11 , L10 , L8 , L7 and L6 for maximum reading on AF VTVM , Oscilloscope or S-Meter on radio.(Picture #4) (Example Picture #5).
Picture #4
Picture #5
4)Switch MODE to USB.
5)Remove Modulation from Signal Generator.
6)Center signal using Clarify Control.
7)Adjust L13 and L14 for maximum reading on AF VTVM , Oscilloscope or S-Meter on radio.(Picture #7) (Example Picture #8).
Picture #7
Picture #8
8)Increase Signal Generator to 100 uV. (Picture #7).
Picture #7
9)SSB "S" Meter: Adjust VR2 for exact reading of "S 9" on radio S-Meter.(Picture #8 and #9).
Picture #8
Picture #9
10)Increase Signal Generator to 1000 uV. (Picture #10).
Picture #10
11)Squelch fully clockwise.
12)SSB Squelch Range: Adjust VR3 so that Squelch just breaks. (Picture #11).
Picture #11
13)Mode to AM.
14)AM/FM Squelch Range: Adjust VR4 so that Squelch just breaks. (Picture #12).
Picture #12
15)Reduce Signal Generator to 100 uV.
16)Squelch fully counter-clockwise.
17)AM / FM S-Meter: Adjust VR1 for "S-9" on radio S-Meter. .(Picture #13 and #14).
Picture #13
Picture #14
18)Mode to FM.
19)Reduce volume as required.
20)Inject modulated FM signal , 100 uV , 1 Khz tone , 5 Khz Deviation. (Picture #15).
Picture #15
21)FM Quadrature Coil: Adjust L5 for max audio with Oscilloscope on IC-2 , Pin 7 (Picture #16 #17and 18).
Picture #16
Picture #17
Picture #18
This completes the Receiver alignments , continue with next topic.
(Super Mods)
Questions? Contact tech307@copperelectronics.com |
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