Becker europa TR, Service Manual

Page: 32 / 45

Balance Hi lfsmittel
Artificial antenna for AM
Artificial antenna for FM
Trimmer set so that is short-circuited at the
sockets AB Kapizität CD 65 pF ± 1 pF.
Connection of the tube voltmeter to the FM test
sockets
Directional interface for voltage
adjustment
Connection for zeroing
U
2 =
U
2 =
or
or
U
2 =
U
2 =
or
R
2 =
146.9 Ω R
2 =
146.9 Ω R
2 =
146.9 Ω R
2 =
146.9 Ω
U
2 =
U
1
• 0.55 U
2 =
U
1
• 0.55 U
2 =
U
1
• 0.55 U
2 =
U
1
• 0.55 U
2 =
U
1
• 0.55
R
2 =
103.8 Ω R
2 =
103.8 Ω R
2 =
103.8 Ω
U
2 =
U
1
• 0.634 U
2 =
U
1
• 0.634 U
2 =
U
1
• 0.634 U
2 =
U
1
• 0.634 U
2 =
U
1
• 0.634
R
2 =
73.4 Ω R
2 =
73.4 Ω R
2 =
73.4 Ω
U
2 =
U
1
• 0.71 U
2 =
U
1
• 0.71 U
2 =
U
1
• 0.71 U
2 =
U
1
• 0.71 U
2 =
U
1
• 0.71
R
1
and R
2
must n ind be uktionsarme resistors. (No wire or coiled film R
1
and R
2
must n ind be uktionsarme resistors. (No wire or coiled film R
1
and R
2
must n ind be uktionsarme resistors. (No wire or coiled film R
1
and R
2
must n ind be uktionsarme resistors. (No wire or coiled film R
1
and R
2
must n ind be uktionsarme resistors. (No wire or coiled film R
1
and R
2
must n ind be uktionsarme resistors. (No wire or coiled film R
1
and R
2
must n ind be uktionsarme resistors. (No wire or coiled film
resistors.)
Adjusting portion AM-FM to the IF balance
1. Ri = Ra ie Ri (signal generator) = R 1 + R 2
(the interface unit)
3. C 2 = 5000 pF ceramic capacitor
4. C1 = 0.1 microfarads wound capacitor
- 30 -
Signal generator
FM signal generator receiver -approximation
Signal generator
Signal generator
U
2 =
U
2 =
Z
1
Z
1
R
1
R
1
= 60 Ω: = = 60 Ω: =
73.4 Ω
U
1
U
1
1,817
Z
1
Z
1
R
1
R
1
= 120 Ω: = = 120 Ω: = = 120 Ω: =
207.8 Ω
U
1
U
1
1,576
Z
1
Z
1
R
1
R
1
= 150 Ω: = = 150 Ω: = = 150 Ω: =
367.2 Ω
U 1
1,407
2. R 1
R 2 = 10
1
U
2
U
2
U
1
U
1
= 1
10