readings on the scale are crowded which causes dif-
ficulty in reading or loss of reading accuracy.
The voltage converter uses specially selected diodes,
resistors and capacitors. The same type of converter is
connected to both the forward power and refrection
power terminals.
Indication and selection
The voltage signal from the voltage converter, which
is proportional to power, is indicated on the 100,uA DC
ammeter through the function selector switch. The
power range is selected by the range selector resistors.
Two sets of voltage converter and selector of the same
design are provided for forward power and refrection
power. These can be used simultaneously. Being so
designed, PF-810 is able to indicate radiant power(RAD).
This is achieved by the differential operation of the
voltage converters to which forward and refrection wave
voltages applied respectively.
In PF-810, two identical circuits are connected back
to back to further improve the performance of the
directional coupler.
6
TX
ANT
...
I
I
4
I J;
V.REF
V.FWD
Fig. 2
TX
.4
ANT1
() () ANT2
.;;'
fig. ~ olock Diagram
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