Trio PF-810 - Operating Parts and Controls; Front Panel Controls Overview; Function Switch Settings

OPERATING PARTS
Meter
Power range
selector
switch
SWR
calibrator
.T'UO
FUNCTION POWER METER PF-8I0
~
RANGE (W) FUNeT","
REF RAO
, ,
"
15'
_SWR
OFF.
CAL<BRATIDN
,0,
,-,
MON MU
ANT SELECTOR
~ :::::8
~
@
Fig. 4 Front Panel
Function
switch
Antenna
selector
switch
Front panel (Fig. 4)
Function switch (FUNCTION)
The function switch is used to select the desired
function to be measured. This rotary switch has 6 posi-
tions, OFF-FWD-REF-RAD-CAL~SWR.
At the OFF, position, the meter circuit is discon-
nected and the meter becomes inoperative, but the
power is still on and the antenna selector switch
remains operative.
At the FWD (forward) position, forward power from
transmitter to load is measured on the meter.
At the REF (refrection) position, refrection power
from load to transmitter is measured on the meter.
At the RAD (radiant) position, radiant power, that is,
forward power minus refrection power (RAD=FWD-
REF), is measured on the meter. In the absence of re-
frection, the reading of FWD is practically equal to that
of RAD.
In measuring SWR, the functoin switch should be set
to CAL position and then to SWR position. First set the
switch to the CAL position and turn the calibration knob
so that the pointer indicates the CAL position on the
meter, then set the switch to the SWR position and the
value of SWR can be measured on the meter. A right
turn of the calibration knob will swing the pointer to
the right, and vice versa. Adjust the knob for accurate
calibration. Do not turn this knob after the function
switch is set to the SWR position.
7