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INSTRUCTION MANUAL
General Description
This antenna is an 8 element, optimum spaced,
2 meter beam. It features extremely high
forward gain, a clean radiation pattern and an
excellent front-to-back ratio. The dimensions
shown in Figure 2 produce a radiation pattern
with low sidelobes and backlobes over the
entire 2 meter band. This antenna comes with
stainless steel hardware for all electrical and
most
mechanical
features a new boom-tomast bracket that will
allow mast sizes of 15/8" to 2 1/16" in
diameter.
connections,
and
ORDER NO. 2085-1
MODEL 28 FM
8 Element, 2-Meter Beam
2
SWR and Feedline
The 28 FM antenna has an input impedance of
200 ohms. The supplied balun matches the
input to 50 ohms. If you are using transmission
line with a characteristic impedance other than
50 ohms or 200 ohms, a matching device must
be made. Refer to any current Amateur
Handbook for information on constructing a
matching device.
now
PN 801318-
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Summary of Contents for Hy-Gain 28 FM
- Page 1 PN 801318- INSTRUCTION MANUAL SWR and Feedline General Description The 28 FM antenna has an input impedance of This antenna is an 8 element, optimum spaced, 200 ohms. The supplied balun matches the 2 meter beam. It features extremely high input to 50 ohms.
- Page 2 Figure I Overall View Figure 2 Front and Rear Boom Detail Tuning NOTE: The Driven and Parasitic Elements are Driven Element: SWR can be lowered to less adjusted independently in the following than 1.2:1 at a desired frequency by manner. carefully trimming the driven element.
- Page 3 Figure 3A Figure 3B VSWR for Horizontal Polarization Only Driven Element Cutting Chart Stacking NOTE: When phasing two antennas, the Driven Element halves that are connected The antenna can be easily stacked for ap- directly to the phasing lines should be on the proximately 3 dB more gain each time the number of yagi is doubled.
- Page 4 Figure 5 Phase Line Cutting Dimensions Installation Step-by-Step Assembly This antenna fits a 1 5/8" to 2 1/16" outside Remove the parts from the carton and check diameter mast. them against the Parts List and the illustrations. Mount the antenna in the clear. Surrounding ob- Select the boom back-up plate, the boom-tomast jects-particularly power lines and other objects bracket and the four (4) 1/4"-20 x 3/4"...
- Page 5 Figure 6 Boom-to-Mast Clamp Assembly Figure 6-Detail A Parasitic Element Attachment...
- Page 6 Figure 6-Detail B Driven Element, Beta Match and Balun Assembly Water proof the connection with neoprene, NOTE: If 50 ohm coaxial cable is used to feed Krylon@, or some similar substance. the antenna, select the supplied balun at this Install caplugs on the ends of the booms and Use the #10-24 x 2 1/2"...
- Page 7 Use the #10 x 3/8" screw to fasten the beta rod Slip the two (2) U-bolts into the boom-to-mast shorting clip over the beta rod, as shown in bracket and fasten it to the mast securely. Figure 6, Detail B. Tape the coax feedline and balun to the boom Select the following rods: D1 (36 1/4"...
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Page 8: Parts List
PARTS LIST Item Part No. Description 170391 Booth, Rear, 11/4" x 74 3/8,..............1 170388 Boom, Front, 11/4" x 74 3/8"..............1 175157 Driven Element, 7/16" x 17 1/4"............2 160040 Beta Rod, 3" ..................1 385142-1 Clamp, Boom-to-Mast................1 385144-1 Back-Up Plate..................1 160038 R1, 40 1/4" x 3/16"................1 160017 D1, 36 1/4"... -
Page 9: 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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