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225-400 MHz
V1
7077
2N1481
20
+24V
10k
2k2
10u
0.22
5
-AVC
0.7V
J1
470p
4k7
82
A1
V1
17k
V2
7077
500
7077
J1
100k
20
10k
15k
4
220k
470
6p
680
100
51
1st LO
1 : 2
First LO (A5 ) 200 - 370 MHz in 18 steps of 10 MHz
No oven
1k8
+133V
100
V2
7077
Z1
Z2
470 p
2
470 p
0.7V
J2
J11
82
0.1V without signal
9
K1
All relay contacts
shown in receive position
V4
V3
7554
7554
20
20
2
2
330
680
+190V
10
RF AMPLIFIER ( A8 )
2k7
V4
V3
7554
7554
Z3
2
2
20 p
500 p
1.0 V
1.7V
J4
J5
J3
470
100
470
150
coax relay
0.47u
1N916
39p
150
470k
0.68u
390
20p
20p
+180V
4
coax T/R switch
A1
J2
2
22k
+13dBm
( 1Vrms)
A2
1N251
To 3d IF
(500kHz)
J2
Testpoint, 1M series resistor and
500pF feedtru not shown
+125V (Rx) / 190V (Tx)
10
J9-J10
45mA
@Tx
V5
6442
Z5
10p
Z4
2
J7
500 p
J8
33
J6
-2 V
-2 V
680
330
19
-6.8V
to guard receiver
K1
+26V
12
A3
J3
J1
3d LO
2nd LO
2.9-3.8 MHz
17-26 MHz
PRC-41 RF parts
For heaters see power supplies sheet
9 dec 2017 kb
4k7
modulator
4k7
6
14
4
spare
+190V
13
+26V on Tx
15
225 - 400 MC
Bandpass filter
A1
First & second IF
A2
First IF
20-30 MHz
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