THANK YOU for your purchase of this Alpha Delta Model DX-EE 40-20-15-10 MTR antenna. We know that you are going to be well pleased with the antenna and its performance. Only the best in materials and hand craftsmanship have gone into its design and construction. The Alpha Delta DX-EE will deliver performance far beyond that of similar antennas of equal size. Like every antenna, the DX-EE must be installed correctly to achieve its inherent peak performance. To help insure that you do obtain good performance, we suggest that you read through this manual entirely and study the figures and diagrams associated with the installation.
*Due to the fact that the Alpha Delta DX-EE 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-EE!
*Refer to Figure No. 1: The DX-EE may be installed as in inverted vee, 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-EE center insulator. Remember, though, the Alpha Delta DX-EE was designed for compromise installations where there are space limitations. A little thought will allow the DX-EE to be installed in spaces normally thought to be too small for an antenna for these frequency bands!
*Tower mounting of the DX-EE will require some form of "standoff" for support of the DX-EE center insulator. A spacing of 18" or more away from the tower will prove adequate.
*Mounting height for the DX-EE 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-EE into a tower system employing multiple guy wires or other wire antennas may cause detuning of the DX-EE 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-EE as "in the clear" as possible. Installing the DX-EE so that it is in a different plane than the 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-EE 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-EE is a much lower "Q" antenna than one that would be constructed using true traps! This allows the DX-EE 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 (match box) for achieving resonance and minimum 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-EE on bands other than the covered ranges. An external wide range tuner may be required.
1. Unroll the DX-EE 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. 40/20 meter wire with an ISO-RES coil and 5 acrylic stand-off insulators installed. (Approximately 20 ft. long)
B. 15 meter wire. (Approximately 11 ft. long)
C. 1 0 meter wire. (Approximately 8 ft. long)
With the Antenna wires laid out on the ground in a fully extended condition, run the 15 and 10 meter wires through the stand-offs as shown in FIG.2 with the 15 meter wire running through the center holes of the 3 long stand-offs and through the bottom holes of the 2 short stand-offs. The end of the 15 meter wire should be twisted back on itself around the last standoff for proper support, after the wire is 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 through 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.
2. Choose the arrangement for mounting your new DX-EE, (inverted vee, flat top dipole, etc.). If the inverted form is chosen, cut a short length of the supplied rope to use as tie support for the DX-EE center insulator.
3. Tie the remaining two pieces of rope to each end insulator of the DX-EE.
4. Any 50 ohm coaxial cable may be employed for use with the DX-EE. 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/X type coax.
5. If the inverted vee configuration is to be used, try to arrange the ends of your DX-EE 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
6. The two ISO-RES coils have been coated with a very special polyurethane with UV light block polymer, and required 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. (Be sure to remove the protective plastic bubble wrap from the ISO-RES coils.)
7. When placing any coaxial sealant over the SO-239 coax connector on the bottom of the DX-EE center insulator, be certain not to cover the four drain holes provided to allow moisture release
8. When tying off the two ends of your DX-EE, 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-EE has been set at the factory for resonance within the 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-EE 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 your rig, just use an antenna tuner and enjoy the antenna as is
*IF 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-EE, 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-EE on the 40M band. many manufacturers offer such tuners for sale, or one may refer to any of the "handbooks" for a construc-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-EE. 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-band operation. 8/32 stainless steel washers and nuts required.
*To lower the operating frequency on the 40M band, a small length of wire may be soldered to each side at the ends of the DX-EE. These ends may then be trimmed to achieve the desired operating frequency. To raise the operating frequency on 40M the 40M wires must be shortened as necessary to reach resonance.
*The DX-EE may be operated on all of the 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. Periodic clearing of the drain holes near the SO-239 connector will reduce build up of residue such as spider webs, etc.
Alpha Delta Warranty is limited to the repair or replacement of any component we find to be defective. Trimmed wire elements are not covered under this warranty.
Should you feel a component is defective WITHIN 90 DAYS of purchase do the
1. Call our office or write for return authorization. Phone or Write:
Alpha Delta COMMUNICATIONS, INC.
P.O. Box 620,
Manchester, Kentucky 40962 - (606) 598-2029 FAX: (606) 598-4413
2. The antenna will be returned to you, shipping prepaid.
NOTE: Installed antennas may not be returned for credit or refund since they cannot be re-stocked and re-sold as new. Tests show that our shortened antennas compare favorably with full size dipoles when installed in the clear.
BEFORE contacting the factory with questions concerning the S.W.R. or resonant frequency run an S.W.R. curve from band edge to band edge for the band or bands in question. Check the VSWR every 25 KHz (every 10 KHz when the VSWR approaches 2:1 or less, to find the minimum). Have this information available when writing or phoning as this will help us to determine if the antenna is too long, too short, or picking up reactance from some nearby object.