Ten-Tec 243 - Page 12

11-243
80504 CONTROL
Mis
This board contains all of the switch wafers associated with the MODE switch.
SIA and SIB route the switching control voltages.
to light the indicator LEDs on the front panel.
S1C and S1D provide voltages
Pin Voltage Readings - (REMOTE switch on VFO position. MODE switch on position 3.)
[Fin Transmit | Receive Pin Transmit | Receive
A 12.0 0 REV 9.9 0
+13 13.8 13.8 1 2.0 2.0
GND 0 0 2 0 0
B' 0 11.9 3 0 0
T 10.5 0 4 2.0 2.0
Semiconductor Voltage Readings - (REMOTE switch on VFO position.
position 3.)
MODE switch on
KI
Transistor
pins
viewed from top
of PC board
Transistor Collector Base Emitter
Transmit Receive Transmit | Receive Transmit Receive
Q1 0.04 13.4 0.78 0 0 0
92 13.8 13.8 0.04 13.4 00 12,17
Q3 13.8 13.8 13.5 0.06 12.8 0
94 13.5 0.06 0 0.76 0 0
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