35
If the lamp sequencing works correctly, then proceed with the next test to confirm switching
operation of the QSK T/R Relay. For this test, we recommend using an audible continuity
tester.
1. Connect one lead of the continuity tester to the center pin of the SO-239 “RF INPUT”
jack.
2. Connect the other lead of the continuity tester to the center pin of the SO-239 “RF
OUTPUT” jack.
Confirm DC continuity between the center pins of the “RF INPUT” and “RF
OUTPUT” connectors.
3. Set the “LINEAR” switch to
OPERATE
.
4. Open the keying line.
5. Switch the amplifier
ON
.
Confirm DC continuity between the center pins of the “RF INPUT” and “RF
OUTPUT” connectors.
6. Electrically short the “Open” end of the keying line cable.
Confirm loss of DC continuity between the center pins of the “RF INPUT” and
“RF OUTPUT” connectors.
7. Measure DC resistance between center pin of the “RF INPUT” connector and the
tuned input network (Refer to Figure 3.16 on page 21) while the
ON AIR
light is
illuminated.
Confirm DC continuity between the center pin of the “RF INPUT” and the tuned
input.
8. Measure DC resistance between center pin of the “RF OUTPUT” and the output
bandswitch while the
ON AIR
light is illuminated.
Confirm DC continuity between the center pin of the “RF OUTPUT” and the
“common” contact of the output bandswitch. The “common” contact should connect
to the RF choke as shown in Figure 3.18 on page 22.
Confirm DC continuity between the center pin of the “RF OUTPUT” and chassis
ground. DC resistance should be
≈
10Ω.
9. Switch the amplifier
OFF
.
www.KesslerEngineeringLLC.com
Summary of Contents for TL-922 Revival (tm)
Page 13: ...6 Figure 3 1 TL 922 Revival tm Upgrade Kit Contents www KesslerEngineeringLLC com...
Page 18: ...11 Figure 3 4 LED Circuit Board Correctly Installed www KesslerEngineeringLLC com...
Page 30: ...23 Figure 3 19 QSK PCB to QRO Output Connections www KesslerEngineeringLLC com...
Page 34: ...27 Figure 3 23 Electronic Bias PCB Installed www KesslerEngineeringLLC com...
Page 47: ...40 Figure 3 30 Step Start PCB www KesslerEngineeringLLC com...
Page 49: ...42 Figure 3 33 LED Schematic Diagram Figure 3 34 LED PCB www KesslerEngineeringLLC com...
Page 50: ...43 Figure 3 35 Electronic Bias Schematic Diagram www KesslerEngineeringLLC com...
Page 51: ...44 Figure 3 36 Electronic Bias PCB www KesslerEngineeringLLC com...
Page 54: ...47 User Notes www KesslerEngineeringLLC com...
Page 55: ...48 5 1 User Notes Continued www KesslerEngineeringLLC com...
Page 56: ...49 5 2 User Notes Continued www KesslerEngineeringLLC com...
Page 57: ...50 5 3 User Notes Continued www KesslerEngineeringLLC com...
