Alpha Delta DX-CC Guida rapida

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.

Indice

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