Refer to the fold-in Schematic Diagram as you read the following circuit
description.
A bare wire connects input jack J101 to output jack J102 through toroid coil
L1010 L1o1 is a current pickup element for both the forward and reflected
power which passes through the remote sensor. A transmitted signal pas-
sing through the sensor induces a voltage in the toroid coil which is directly
proportional to the RF current. A voltage sampled directly from the trans-
mission line is summed with the voltage at L101. The sum of the voltages is
then rectified by diode D102 and is filtered by capacitor C104. The sensor is
factory calibrated to within 5% accuracy by control R106 for the 0-2000-
watt circuit and by control R1o? for the 0-200-watt circuit.
The "out-of-phase" (reflected) current-induced voltage that was summed
with the sampled voltage is rectified by diode D1o1 and filtered by
capacitor C101. With a very good load, that is one with less than 1.05: 1
VSWR, the two voltages will be about equal and out of phase and no
reflected voltage would appear in the reflected circuits. Reflected power is
factory calibrated by control R104 for the 0-50-watt scale and by R105 for
the 0-500-watt scale.
The calibrated voltages from the remote sensor are routed through a 5-wire
cable to the input circuits of the switch circuit board.
I\lPORT_\"'\l'
Tie
remote sensor is factory aligned, calibrated, and is
seale-d:
·.:c:c.,,· •..
tiorize-d tampering with the remote sensor can void the War-
ranty
0:::'
your V_-2tt:rrleter.
C\'OTI: 'Tie :J:-.''-iOI'::and reflected circuits on the switch circuit board are
\'irtually :de::.::cc:.. I::.me fDllowing discussion, we will explain the opera-
tion of the rDrwiOId circuits. Where differences exist between the basic
operation DI me
t'SG
circuits. further details will be supplied.
The Ionmrd signal
=C:TI
:he remote sensor is coupled to the switch circuit
board and is roc:te-d tc.."=i~gb.LOW-HIGH switch SW1. If the output of the
transmitter is known te De less than 200 watts, switch SW1 should be set to
the LOlr (in; pos:GCI:.
=i
tl::e power is greater than 200 watts, switch SWl
should be set to HIGi-l
=-':':.
Signals from S\ \'1 are cu-':':i'"dd:rectly to SET-FWD switch SW4. When SW4
is in the SET lin ;Jos:t:o::'. :'::.eforward rFWD) meter is temporarily discon
nected from the circe::. T::e low-current input from the sensor is coupled
directly through S\\·.;. tirT-=.gi Sensiti-.-ity control R1 to the contacts
0
S\VR-REF s\\-itch S\\'3.
Tie
SET ;Josition of sIr ..•is used only in conjunc-
tion with S\\'3 when SW3
:5
:n the S\\~ position. At that time, the REF
(reflected) meter "Set" :.':ldex is used to calibrate the meter for SWR read-
ings.
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