MFJ MFJ-817C - Calibration Continued; SWR Calibration and Frequency Specificity

MFJ-817C
Deluxe
VHF/UHF
True
Peak
Reading
SWR/Wattmeter
Instruction
Manual
Meter Calibration (cont.)
8.
With
the
300/30
Watts
button
pushed
out
for
the
6
Watt
reflected
scale,
Transmit
1
Watt
as
indicated
on
the
reference
meter.
Adjust
the
LO
REF
trim
pot
to
set
the
reflected power scale to 1 Watt.
9. SWR requires no calibration.
10.
Repeat
each
calibration
for
each
frequency
if
needed
until
the
meter
has
the
correct
readings
on
each
frequency.
VHF/UHF
Standard
MFJ-817C
50-Ohm
Transmitter/
Reference
SWR/
Dummy
Load
Transceiver
Wattmeter
Wattmeter
Figure 1; Test Setup
LO REF LO FWD
Q ©
a
HI REF HI FWD
Q@ © 0
Figure 2: PCB Layout and Trim Pot Location