PRC-41 First and second IF amplifier ( A2)
3 nov 2017 kb
15k
22k
1k
100
470
6k8
1k
220
2k7
10k
2k7
1k
15k
15k
4k7
1k8
12
100k
100p
100p
1k8
15k
4k7
4k7
J1
J3
J2
120
1k
2k7
100k
33k
1k5
1k
4k7
1k
4k7
39k
3k3
100k
7p
5
6
K2
K1
K3
Q2
2N915
Q1
3N35
Q3
3N35
Q4
3N35
Q6
2N338
Q7
2N338
Q5
3N35
3d LO
2nd LO
1st IF
20-30MHz
A1
A3
A2
500kHz output
Signal to third IF
2nd IF filter
2.9 – 3.9 MHz
17.1 19.1 21.1
18.1 20.1 MHz
26.1 24.1 22.1
25.1 23.1 MHz
2.9 3.1 3.3
3.0 3.2 MHz
3.8 3.6 3.4
3.7 3.5 MHz
10n
10n
1n
10nF
43p
4k7
Tx
+25V 30mA
AVC
A3
A2
A1
1
6
5
10
+25V / 30mA
100p
100p
1n
K2
K1
K3
Coils 26V /40mA
1Vpp RF
1Vpp RF
17.1 MHz
26.1 MHz
29.1 MHz
2.95 MHz
Clockwise= higher freq
Red= 2 unused positions
3d LO & IF
1st IF
2nd LO
20 MHz
3
22pF
1k
20pF
6p
6p
180p
150p
220p
2.7uH
1nF
47pF
5 pF
K1
1n
1n
+12V
10n
10n
10n
1 pF
7pF
10
10n
1
10
10
1
8p
20p
180p
10k
10k
100p
20p
10nF
10k
10nF
1n
1n
+ AVC