
MFJ-817C Deluxe VHF/UHF True Peak Reading SWR/Wattmeter
Instruction Manual
4
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.
Figure 1
: Test Setup
Figure 2
: PCB Layout and Trim Pot Location
VHF/UHF
Transmitter/
Transceiver
Standard
Reference
Wattmeter
MFJ-817C
SWR/
Wattmeter
50-Ohm
Dummy Load
HI FWD
LO REF
HI REF
LO FWD