The MFJ-1652 is a ground-mounted monopole, so tuning dimensions and
SWR are highly dependent on the electrical characteristics of the counterpoise
connected to the base block. To adjust for 14 MHz and higher, simply set the
element length by adjusting the whip and the tap on the loading coil -- then
increase or decrease it until resonance falls in-band. The actual length required
to achieve resonance may vary significantly, at the frequency of interest. To
adjust for 144-148MHz, Simply remove the loading coil assembly and reattach
the antenna to the Base Block and adjust the SWR by telescoping the antenna
out and in.
In Case of Trouble
If you are unable to obtain low SWR, if settings deviate widely from the chart, or if
SWR jumps intermittently, check the following:
[ ] Are the coil assembly and whip fully seated?
[ ] Is there damage to the coil or tap wire?
[ ] Is your coax feed shorted, open, or intermittent?
[ ] (Above 20-M) Are all of L1’s turns bypassed by the slider?
[ ] Is your feedline “hot”? If so, add ferrite beads or install an unun.
Care and Maintenance
The MFJ-1652 is constructed from non-corrosive and UV-resistant materials.
Although not designed for permanent outdoor installation, no maintenance
should be required other than periodic cleaning and inspection of the coil
assembly and collapsible element. Store in a sheltered location when not in use.
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 reading the manual
does not solve your problem, 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.
NOTES:
