- 20 -
adjustment made to the highest element section. As a rule of thumb, one foot of length should be
approximately 50 kHz in frequency. A shorter antenna length = higher frequency and a longer
antenna length = lower frequency.
Connect the Base Matching Network Assembly and adjust the
inductance by changing the tap connection and watch for a change in SWR to obtain the best
impedance match.
Once final tuning is complete and you have verified correct operation on-the-air, the
DXE-VMN-1
coil tap should be soldered in place to eliminate any future intermittent connection due to
environmental corrosion to the coil taps.
Optional Upgrade to DX-80VA-3 80 Meter Vertical
The
DXE-60VA-1P
60 Meter vertical can be upgraded to a
DXE-80VA-3
80 Meter monoband
vertical by adding the following parts:
DXE-60VA-1THK - 80 Meter Capacity Top Hat Conversion Kit
- The
THUNDERBOLT
®
DXE-60VA-1THK
is a precisely designed top hat which, when added to the
DXE-60VA-1P
DX
Engineering
THUNDERBOLT
®
high performance 60 meter multi-band vertical antenna system
or
DXE-MBVA-1
Vertical Antenna, will convert it to a monoband 75/80 meter antenna with
performance undetectably different from a full-length quarter wave vertical on that band. If you
have not already added it, the
DXE-VMN-1
Vertical Antenna Matching Network will allow precise
adjustment of VSWR after setting the resonant length desired. It will be tunable to operate over
segments of the entire band with an SWR of 1.5:1 or less, yet is only an optimum 43 feet high!
Designed with 6063 corrosion-resistant aluminum and stainless steel hardware, the top hat kit
shares the same rugged, long lasting construction of the antenna. The 80 meter performance of DX
Engineering’s new
THUNDERBOLT
®
technology has been proven in the hostile, remote
environment of Antarctica’s Peter I Island by the outstanding performance by the
3Y0X
DXpedition
with an amazing 5,869 QSOs.
The top hat forces radiation current to be maximized over the
entire height of the vertical. This allows the antenna to be
shorter without giving up efficiency or radiating
performance. With this antenna, you get full-size 80 meter
performance in an antenna only 43 feet high. Instructions
provide for two-level mid and top guying.
DXE-80VA-2AK - Ice/Severe Weather Kit
– provides
additional support for the top hat in areas where ice buildup or continual high winds are prevalent.
May be added during the initial construction of the antenna, or at a future date without affecting
operation.
Summary of Contents for DXE-60VA-1P
Page 15: ...14 Figure 10...
