Heathkit SB-10 Series Troubleshooting Manual page 47

TP Injection Test
Point
②
Product Detector
Input
③
2 nd IF Amp Input
④
1 st IF Amp Input
⑤
2 nd RX Mixer Input
⑥
1 st RX Mixer Input
⑦ RF Amplifier Input
⑧ Antenna
Table 2. RF and IF Stages Expected Signal Levels
Notes:
1. Adjust the Frequency dial for maximum signal
2. Adjust the Frequency dial and Preselector control for maximum signal
3. Expected values are simply a guide based on the average values observed in several rigs
and are not based on any published specification
Signal Level Measurements
Input Signal Injection
Injection Point Frequency
V13 pin 8 3,395 KHz
V4 pin 1 3,395 KHz
V3 pin 1 3,395 KHz
V12 pin 2 3,395 KHz
8,695 KHz
V11 pin 1 8,695 KHz
3,700 KHz
V10 pin 1 3,700 KHz
Antenna Jack 3,700 KHz
7,200 KHz
14,200 KHz
21,200 KHz
28,200 KHz
28,700 KHz
29,200 KHz
29,700 KHz
Expected Input
for 2 VAC at top
of AF Gain Pot
-8 dBm
-26 dBm
-61 dBm
-66 dBm
(1) -64 dBm
(1) -65 dBm
(1) -57 dBm
(2) -78 dBm
(2) -85 dBm
(2) -80 dBm
(2) -87 dBm
(2) -87 dBm
(2) -82 dBm
(2) -82 dBm
(2) -83 dBm
(2) -82 dBm
Measured Input
for 2 VAC at top
of AF Gain Pot
Page 47