MFJ-9420 Installation Manual
20-Meter SSB Travel Radio
1 1.4 10.0 1.4 5.0 9.9 1.3 1.4
2 1.4 10.0 1.4 5.0 2.5 1.3 1.4
3 0 0 0 5.0 0 0 0
4 3.9 3.3 4.0 0 2.9 4.9 4.7
5 3.9 4.9 4.0 5.0 4.9 4.9 4.7
6 4.9 3.3 5.0 5.0 0 5.7 5.8
7 4.5 0 4.6 5.0 0 4.9 5.2
8 5.0 10.0 5.1 9.9 4.9 4.9 5.8
BIPOLAR AND JFET DEVICES:
D/E = Drain/Emitter
S/B = Source/Base
G/C = Gate/Collector
* = Test in TRANSMIT mode
** = Test with TUNE switch depressed
*** = DO NOT TEST gate of Q9 may cause generation of parasitic oscillations.
Q1
Q2
Q3
Q4
Q5*
Q6
Q7*
Q8**
Q9 Q10
D/E
9.8 0 9.0 9.7 0 0 3.5 0
13.0
0.25
S/B 2.3 0.7 3.9 8.9 0.7 0.7 2.8 0 0 1.0
G/C 0 13.2 0 4.3 13.0 0 0 9.0
***
13.7
Q11 (MRF477 PA Transistor): To avoid RF damage to DVM, check collector voltage in receive
mode only full supply voltage (13.8 V) should be present. Check base (bias) with PTT pressed,
no audio this should indicate 0.6v. Emitter is grounded.
