Icom IC-201, Manual

Page: 11 / 21

DL7MAJ, Oct 20
th
2015
Page 11 (21)
Final/PA
1) “Coarse” to 145MHz, VFO to 000 (equals 145,000MHz)
2) Remove heatsink from rear of PA-unit (from now on observe it´s temperature)
3) Connect Dummyload 50W and Powermeter to antenna output
4) Remove jumper P11 from J11
5) “CW”, unkeyed
6) Connect A-meter between pin 2 & 3 of J11 (measures current of Q1)
7) “TX”
8) Adjust R3 for app. 30 to 40mA
9) “RX”
10) Connect A-meter between pin 1 & 4 of J11 (measures current of Q2)
11) “TX”
12) Adjust R8 for app. 80 to 90mA
13) “RX”
14) Mode “FM” and “TX”
15) Adjust C11, C12, C22, C23 for maximum output; should be 10W
16) Maybe TX-limiter R13 limits the output; then adjust R13 for 10W and go back to 15)
17) Adjust R12 for SWR=0
18) Connect resistor 25

/20W to antenna output (2 x 50

parallel)
19)
Adjust R17 for reducing TX-output: SWR protection at SWR = 2