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308 Industrial Park Road
Starkville, MS 39759 USA
(662) 323 -953 8 FAX: (662) 323 -6551
INSTRUCTION MANUAL_
General Description
The "DX-77-A" is an omnidirectional, self-sup-
porting,
automatic-bandswitching
radiator which operates on the 10, 12, 15, 17, 20,
30 and 40 meter Amateur bands. No ground
radials are used with the DX-77-A. The DX-77-A
design is based upon an off-center-fed dipole,
sometimes called a "Windom" antenna. High-
efficiency high-power traps are used to isolate
the active sections of this antenna.
Frequency
40m
7.0 - 7.3 MHz
30m
10.1 - 10.15 MHz
20m
14.0 - 14.35 MHz
17m
18.068 - 18.168 MHz
15m
21.0 - 21.45 MHz
12m
24.89 - 24.99 MHz
lom
28.0 - 29.7 MHz
VSWR' of Resonance............................. .. .....................................................less than. 1.5:1
Maximum Power (at 95° F) ............................................ 750 watts ave., 1500 watts PEP
Gain..... . ........................................unity gain (compared to half-wave vertical dipole)
.....................................................................................................50
Input Impedance
Total Height............................... ......................................................... 29 feet (8.8'
Bottom Radial Elements .........................................................................4 each, 5 feet (1.5 m)
Allowable Mast O.D. . .....................
Recommended Masts8 to 10 foot length) ................ Aluminum, 2 inch O.D.,
Steel, 2 inch O.D., :058 wall min.
Weight................... ... ....................................................................... 25 lbs. (11.35 kg:)
Wind Area . ... .... ............. ....'.................................................
Maximum Wind Speed (unguyed) ........................................................ 60 mph ( 96.77 Kmph)
Ph :
vertical
Bands:
7-Band HF Vertical
10, 12, 15, 17, 20, 30, 40-Meter
The DX-77-A uses a heavy-duty tiltable mast
clamp which will accept masts of up to 2 118"
inches O.D. The entire antenna may be easily
raised and lowered for tuning purposes and for
recreational - vehicle (RV) installations. The
DX-77-A also features an overall length of 29
feet (8.8 m), which contributes to exceptional
bandwidths on 40 and 20 meters.
Specifications
Electrical.
1500 KHz min., 1700 KHz typ.
Mechanical:
................................1.75 - 2.125 inches (44
DX-77A
2:1 VSWR Bandwidth
100 KHz min.; 150' KHz typ.
100' KHz min., 150 KHz tpy.
200 KHz min., 250 KHz typ.
200 KHz min., 250: KHz typ.
400 KHz min., 500 KHz typ.
300 KHz min., 400 KHz typ.
.125
wall
sq. ft. (.1767 sq. m.)
1.9
ohms
m)
-
53 mm)
min
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Summary of Contents for Hy-Gain DX-77A
- Page 1 DX-77A 7-Band HF Vertical 10, 12, 15, 17, 20, 30, 40-Meter 308 Industrial Park Road Starkville, MS 39759 USA Ph : (662) 323 -953 8 FAX: (662) 323 -6551 INSTRUCTION MANUAL_ General Description The DX-77-A uses a heavy-duty tiltable mast The "DX-77-A"...
- Page 2 Choose Location R e q u i r e d : Tools Tape Measure, 12 feet Choose a location for the DX-77-A in the clear, assembly, away from trees, buildings, power-lines and other tuning metallic objects. DX-77-A should Nut Driver, 3/8 inch attached to a steel mast or heavy aluminum mast tuning and for assembly' of matching...
- Page 3 Installation of Tubing Clamps After adjustment of the tubing lengths, tighten Select the proper size tubing clamp as shown in the clamp with a 5/16 inch nut driver, socket, or the chart. When installing the clamps, place the open end wrench until the tubing will not twist or clamp near the tube end with the top of the clamp telescope.
- Page 4 NOTE Tubing insertion depth is 3" (76 mm) unless otherwise noted. Item Description Description Tube, 7/16" x 62" Tubing Section #2, 1 1/4" x 48" Tube, 5/8" x 48" swaged Tubing Section #1 Trap Assembly #3, 30 meter Clamp, #6 tube Trap Assembly #2, 17-20 meter Clamp, #10 tube Trap Assembly #1, 10-12-15 meter...
- Page 5 Assembly of Antenna Select the 5/8 x 48 inch swaged tube and #10 If available, place two saw-horses approximately tubing clamp. Place the tubing clamp over the top 15 feet (4.6m) apart. These will be used to support of the #3 Trap Assembly and insert the tube 3 the antenna during assembly.
- Page 6 Mathing Unit Assembly Select the DX-77-A matching unit, upper clamp, Assemble as shown in Figure 4. Tighten all con- two (2) bottom clamps, 10-24 x 1" screws, 10-24 nections securely. nuts and lockwashers, 1/4"- 20 x 1" bolt, 1/4"-20 nuts and lockwashers. Figure 4 Matching Unit Assembly...
- Page 7 Base Bracket Assembly Select the DX-77-A Base Parts Pack. If you will Practice swivelling Section #1 to a vertical posi- be using the tilt-over feature, you will need to drill tion and installing the other bolts. With help from a 3/8" hole through your support mast at the at least one more person, reattach the rest of the mounting location.
- Page 8 Tuning the DX-77-A Each band on the DX-77-A can be independently The match on all bands (lower SWR) is pre-set by tuned for resonance by adjusting each trap reso- the matching network in the plastic box and by the nance on the 30-10 meter bands, and by adjusting length of the radial tubes.
- Page 9 DX-77-A Mining Guide: To Lower Resonance: To Raise Resonance: 42" 10 meters: Move 10m adj. clamp lower Shorten length of trap 42" 12 meters: Move adj. clamp lower Shorten length of trap 15 meters: Move 15m adj. clamp lower 42" Shorten length of trap 17 meters:...
- Page 10 Detail A Front View Detail B Side View...
- Page 11 Service Information Hy-Gain If you are encounter technical problems and need 308 Industrial Park Road assistance, you should contact Hy-Cain Customer Starkville, Mississippi 39759 USA Service Department. Phone: 662-323-9538 FAX: 662-323-6551 All requests, inquires, warranty claims, or for ordering replacement parts, contact:...
- Page 12 DX-77-A Parts List Item Part 170495 Tube, 7/16" x 62" ...............1 175165 Tube, 7/16" x 52" ...............4 190000 Tube, 5/8" x 48" swaged ............1 191021 Tube, 5/8" x 7 1/2" swaged ............4 870925 Matching Unit, DX-77-A............1 870926 Trap Assembly #3, 30m ............1 870927 Trap Assembly #2, 17-20m ............1 870928...
- Page 13 DX-77-A Parts List (continued) Item Part Description Qty Number Number 870935 Coil Assembly, 30m ..............1 870938 Coil Assembly, 20m ..............1 870939 Coil Assembly, 17m ..............1 870942 Coil Assembly, 10-12-15m ............1 870936 Capacitor Assembly, 30m ............2 870940 Capacitor Assembly, 20m ............1 870941 Capacitor Assembly, 17m ............
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Page 14: Limited Warranty
Hy-Gain Warrants to the original owner of this product, if manufactured by Hy-Gain and purchased from an authorized dealer or directly from Hy-Gain to be free from defects in material and workmanship for a period of 12 months for rotator products and 24 months for antenna products from date of purchase provided the following terms of this warranty are satisfied.
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