MFJ-1642 Portable Whip Tuner
Instruction Manual
5
There are cases very little deflection of the SWR Wattmeter can be seen. However, even though the
meter may not indicate much SWR change while adjusting the COUNTERPOISE control, even the
slightest SWR drop indicates that the artificial ground is helping.
Tuning Out Reactance of Long Ground Leads
If the station ground has a long lead, you can connect it to the COUNTERPOISE binding post of the
MFJ-1642. Connect the station ground bus and accessories to the GROUND post.
Do not reverse
these wires.
Follow the same procedure for minimizing SWR described in the tuning procedure.
WARNING:
This unit does NOT provide a dc or ac safety ground through the
COUNTERPOISE terminal. A separate wire from the station ground bus to
an electrical or earth ground must be used.
TVI and RFI Hints
It is possible for RF to flow down power cables into the house wiring. This may cause TVI, Stereo,
VCR or other RFI problems. As a precaution, a ferrite core can be clamped around power leads. The
MFJ-701 RFI-FREE CHOKE KIT makes it easy to eliminate common RFI problems.
Technical Assistance:
If you have any problem with this unit first check the appropriate section of this manual. If the manual
does not reference your problem or your problem is not solved by reading the manual, you may call
MFJ Technical Service
at
662-323-0549
or the
MFJ Factory
at
662-323-5869
. You will be best
helped if you have your unit, manual and all information on your station handy so you can answer any
questions the technicians may ask.
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road, Starkville,
MS 39759; by Facsimile (FAX) to 662-323-6551; or by email to [email protected]. Send
a complete description of your problem, an explanation of exactly how you are using your unit, and a
complete description of your station.
