Alpha Delta DX-CC Quick start guide

ALPHA DELTA DX-CC 82 FT. LONG "NO TRAP"
INSTALLATION NOTES
**Due to the fact that the ALPHA DELTA DX-CC antenna approximates a half
wave dipole (although greatly reduced in length), the method of mounting or
installing it does not present some of the problems associated with other types of
antennas. Towers, trees, wooden utility masts, etc. may all be employed as the
support structure for the ALPHA DELTA DX-CC!
*Refer to Figure No. 1: The DX-CC may be installed as in inverted seem flat top
dipole, sloping dipole, etc. The inverted vee configuration seems to be the
easiest for most amateurs to utilize. It has several benefits, such as requiring but
a single central support structure for the DX-CC center insulator. Remember,
though the ALPHA DELTA DX-CC was designed for compromise installations
where there are spacelimitations. A little thought will allow the DX-CC to be
installed in spaces normally thought to be too small for an antenna for these
frequency bands!
*Tower mounting height for the DX-CC will require some form of "stand-off" for
support of the DX-CC center insulator. A spacing of 18" or more away from the
tower will rove adequate.
*Mounting height for the DX-CC is not overly critical. However, as with most half-
wave antennas, the higher and in the clear, the better. Let the space you have
available dictate the mounting height and scheme of installation. The antenna
has been tested at a height of 35 ft. Lower heights may cause higher VSWR.
*The introduction of your DX-CC into a tower system employing multiple guy
wires or other wire antennas may cause detuning of the DX-CC antenna. This
may be evidenced by a shift in the resonant frequency or increase in the
minimum VSWR of the antenna. Try to keep the DX-CC as "in the clear" as
possible. Installing the DX-CC so that it is in a different plane than guy wires will
help, as will "breaking" the guy wires with strain insulators. For some
installations, it may be necessary to employ the use of an antenna tuner to
overcome this detuning situation.
*The DX-CC utilizes the exclusive ALPHA DELTA ISO-RES coil principle for
shortening and multibanding an antenna. The ISO-RES is not a trap, due to the
fact that there isn’t a trap capacitor being used. Thus, the DX-CC is a much lower
"Q" antenna than one that would be constructed using true traps! This allows the
DX-CC to be broader in bandwidth than is possible with a trap-type antenna of
equal size. The lower "Q" also allows the user to employ a moderate range

antenna tuner (matchbox) for achieving resonance and min. SWR anywhere
within the covered frequency bands.
NOTE: Some automatic antenna tuners in transceivers do not have the
impedance range to tune the Model DX-CC on bands other than the covered
ranges. An external wide range tuner may be required.
INSTALLATION INSTRUCTIONS
Unroll the DX-CC wire elements, removing any kinks that may have been
induced during the packing operation. At each side of the center insulator you will
find 3 wires:
A 80/40 15 meter wire with an ISO-RES coil and 6 stand-off insulators installed.
(Approximately 41 ft. long)
B. 20 meter wire. (Approximately 16ft. long)
C. 10 meter wire. (Approximately 8 ft. long)
With the antenna wires laid out on the ground in a fully extended condition, run
the 20 and 10-meter wires through the stand-offs as shown in FIG. 2 with the 20
meter wire running through the center holes of the 3 long stand-offs and through
the bottom holes of the 3 short stand-offs. The end of the 20-meter wire should
be twisted back on itself around the last stand-off for proper support, after being
made taut. The 10-meter wire is run through the bottom holes on the 3 long
stand-offs as shown. It is then twisted back on itself around the last long stand-
off, after being made taut. All of the stand-offs should be spaced equally along
the wires for best support. When all of the wires and stand-offs have been
positioned properly, tightly wrap wire-ties around the top and bottom of each
stand-off and antenna wire to prevent movement. See FIG. 2 for method. For the
wire-ties, cut approx. 6" lengths from the 12-ft. coil of wire provided. Choose the
arrangement for mounting your new DX-CC, (inverted vee, flat top dipole, etc.). If
the inverted form is chosen cut a short length of the supplied rope to each end
insulator of the DX-CC. Tie the remaining two pieces of rope to each end
insulator of the DX-CC. Any 50-ohm coaxial cable may be employed for use with
the DX-CC. We suggest the use of RG-213 as it is generally a good "buy" and
will last many years. Installations where only low power operation is being used
can get by with RG-58A/U or RG-8X type coax. If the inverted vee configuration
is to be used, try to arrange the ends of your DX-CC so that when viewed from
the side the angle at the apex of the antenna is 90 degrees between the two
element wires –see Figure No. 1.

The two ISO-RES coils have been coated with very special polyurethane with UV
light block polymer, and require no further coating or protection. A small amount
of coax seal placed around the bare copper ends of the element wires (at the
screws) on the coils would be helpful. When placing any coaxial sealant over the
SO-239 coax connector on the bottom of the DX-CC center insulator, be certain
not to cover the four drains holes provided to allow moisture release! When tying
off the two ends of your DX-CC, allow a small amount of slack (or sag) in the
system. Don’t cinch the elements down snug!
TUNING AND OPERATING INSTRUCTIONS
Your ALPHA DELTA DX-CC has been set at the factory for resonance within the
80, 40, 20, 15 and 10 meter bands. With proper installation, you should easily
find the resonance points within these covered bands. The design of the DX-CC
is such that the normal VSWR on 10 meters is approx. 2:1, with the VSWR on
the other bands approaching 1.5:1 at resonance. The VSWR curve on 20, 15,
and 10 meters is usually broad enough, depending upon the installation site, that
fine tuning and trimming on these bands is not normally worth the effort.
Additional radiation efficiency is typically not realized. If VSWR is higher than
specified for you rig, just use an antenna tuner and enjoy the antenna as is! (No
separate adjustment is available for 15 meters since it is a third harmonic of the
40-meter section).
*IF THE USE OF AN ANTENNA TUNER IS PLANNED --- NO TUNING OR
MODIFICATION IS NECESSARY. PUT IT UP AS IS AND ENJOY IT!
*Should the installation be such that it is detuning the DX-CC, we recommend the
use of an antenna tuner to cancel the reactances and achieve normal swr and
resonance.
*We recommend the use of a good, wide range antenna tuner (matchbox) for use
with the DX-CC on the 80M band. Many manufacturers offer such tuners for sale,
or one may refer to any of the "handbooks" for a construct-it-yourself project!
*When installed in the inverted vee configuration, minimum SWR may be
regulated (to a degree) by varying the included angle (apex angle) and the
mounting height. Since each installation offers its own set of variables, this work
must be done on a somewhat "trial and error" basis.
*An open wire "ladder" type feedline (a balanced feedline) may be used with the
ALPHA DELTA DX-CC. Please note on the main diagram the two arrows labeled
"a". The two conductors of your balanced feedline would be needed for such an

optional installation and would allow low loss Multi-brand operation. 8-32
stainless steel washers and nuts required.
*For a convenient way to lower the operating frequency on the 40M band, please
refer to Figure No. 2 where the installation of the stub tuning wires are shown.
Please cut a 6-ft. length of wire into two equal lengths. Install one of these wires
under the innermost nut on the ISO-RES coil. Repeat this for the ISO-RES on the
other side of the DX-CC. Trimming these two stub-tune wires will allow the user
to adjust the 40M resonant frequency to the point desired. To raise the operating
frequency on 40M, the main 40M wires must be shortened as necessary to reach
resonance.
Remember to strip the insulation from the connection end of the stub tuning wire.
* To lower the operating frequency on the 80M band, a small length of wire may
be soldered to each side at the ends of the DX-CC. These ends may then be
trimmed to achieve the desired operating frequency. To raise the operating
frequency on 80M the 80M wires must be shortened as necessary to reach
resonance.
*The DX-CC may be operated on the entire amateur HF bands with the
incorporation of a good antenna tuner into the system! Using the antenna tuner in
the system will allow full operation WITHOUT ANY MODIFICATION OR TUNING
OF THE DX-EE!
*If a tuner is to be used in a multi-band arrangement (all HF bands), a
recommended alternative arrangement would be to short the shield and center
conductor of the coax at the transmitter end, then connect as "long wire" to the
random wire output of the antenna tuner. This system has worked very well
during our many tests of the DX-CC. For these installations the antenna tuner
must be well grounded.
*Periodic clearing of the drain holes near the SO-239 connector will reduce build
up of residue such as spider webs, etc.