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The first feedline configuration involves connec-
tion of the coaxial feedline directly to the driven
element. The recommended feedline is RG-213/U
(such as Belden 8267). Other types of coaxial
cable may be used if proper selection and careful
assembly are utilized. The feedline should be
stripped as shown in Figure 7. Attach solder lugs
(not supplied) to the center conductor and shield
for easy connection to the driven element.
Weatherproof all connections.

The second feedpoint configuration involves con-
struction and installation of a homemade RF
choke. The RF choke will prevent RF from flow-
ing on the outside of the coaxial shield. This will
block radiation from the coaxial feedline; thereby
reducing the risk of TV1 and preventing radiation
pattern degradation.

NOTE: Use caution when selecting a balun to use
with this antenna. Some baluns are designed for
50-75 ohm impedance and may result in a higher
SWR when used with this antenna. For best
results, use the Hy-Gain BN-86, 50 ohm balun.
The Model BN-86 is available at your local Hy-
Gain dealer.

Carefully recheck all measurements, make certain
the drain holes in the traps are facing down and
then tighten all compression clamps securely.

Make certain all electrical connections are tight.
Weatherproof your coaxial connection using
Coax-Seal (R) or some similar substance.

Slip the boom-to-mast clamp over your mast and
tighten securely.

Wind the RF choke from RG-213/U ( or
equivalent) coaxial cable. The choke should con-
sist of 12 turns with an inside coil diameter of six
inches. Allow enough cable at the end to reach
from the mast to the driven element. Strip the
coaxial cable as shown in Figure 7. Attach solder
lugs (not supplied) to the center conductor and
shield for easy connections to the driven element.
Weatherproof all connections.

This completes your installation.

WARNING

Installation of this product near power lined is
dangerous. For your safety, follow the
installation directions.

The third feedpoint configuration involves using
a 50 ohm 1:1 balun to connect the feedline to the
driven element. (Hy-Gain Model BN-86 is
recommended.) A balun will act as an RF choke
and will balance the flow of current on the driven
element, resulting in a symmetrical radiation pat-
tern. A balun will also have a coaxial connector,
providing more convenience than a coax splice.
Follow the instructions supplied with the balun
for connection to the antenna.

Содержание TH-3JRS

Страница 1: ...s but still wants top per formance on 10 15 and 20 meters 300 Industrial Park Road Starkville MS 39759 Ph 662 323 8538 FAX 662 323 6551 Specifications Electrical Forward Gain Up to 8 dBi Front To Back Ratio 25 dB VSWR at Resonance Less than 1 5 1 Nominal Impedance 50 ohms Power Capability Transmitter Output 600 Watt PEP 300 Watt AM Lightning Protection DC ground Mechanical Net Weight 21 lbs 11 7 k...

Страница 2: ...own in Figure 1 DO NOT tighten at this time Slip the boom sections into the boom to mast bracket until they meet in the middle Make certain the drilled holes on the reflector end are on top and close to the boom to mast bracket then tighten the bolts securely NOTE The reflector portion of the boom has holes drilled in it for the beta match Make sure they are on top when you tighten the boom to mas...

Страница 3: ...e Measure along the boom 65 1 8 from the center of the reflector element to boom bracket and in stall the driven element to boom bracket Select the DE sections and slip the driven element in sulators onto one end of the DE1 sections 7 8 x 72 Now recheck the measurement and make certain all the elements are aligned evenly Measure 74 from the center of the driven element bracket to the center of the...

Страница 4: ... of transmis sion either Phone or Continuous Wave CW Refer to the dimensions for your mode of trans mission Use the same mode for all dimensions Select the 10 meter reflector trap marked REF and a 6 tubing clamp and slip it on the end of Rl Slip the longest end of the 10 meter trap into the Rl section to the dimensions given for your mode of transmission Tighten the tubing clamp slightly See Figur...

Страница 5: ......

Страница 6: ... as shown in Figure 6 After adjustment of the tubing lengths tighten the clamp with a 5 16 inch nut driver socket or open end wrench until the tubing will not twist or telescope VSWR Charts These VSWR curves are typical for this antenna mounted 70 feet above ground horizontally polarized Similar curves can be expected for this antenna mounted at least 30 feet above ground DO NOT try to tune this a...

Страница 7: ...t 10 DE Reflector 10 REF Select the remaining DE tube sections and install as before Select the remaining director tube sections and install as before Select the beta match support insulators as shown in Figure 7 Select the beta shorting strap and install as shown in Figure 7 Tighten all hardware used with the beta match shorting strap and driven element Remeasure the dimensions between elements a...

Страница 8: ...Figure 7 Beta Match Feedline Attachment Figure 8 RF Choke ...

Страница 9: ...the drain holes in the traps are facing down and then tighten all compression clamps securely Make certain all electrical connections are tight Weatherproof your coaxial connection using Coax Seal R or some similar substance Slip the boom to mast clamp over your mast and tighten securely Wind the RF choke from RG 213 U or equivalent coaxial cable The choke should con sist of 12 turns with an insid...

Страница 10: ...85142 1 Boom to Mast Bracket 1 18 385144 1 Boom to Bracket Clamp l 19 176232 Beta Match l 878685 Parts Pack 221S 1 stainless steel l 21 169339 Tubing Clamp 7 8 2 22 173370 Beta Shorting Clamp 1 23 358756 Clamp 6 Tubing 24 24 Not Used 25 455630 Caplug 1 2 26 455644 Caplug 7 16 6 27 463642 Insulator Beta Match 2 28 463767 Insulator Driven Element 2 29 520034 Screw Type T 6 32 x 11T rh 3 30 500160 Bo...

Страница 11: ...r warranty provided the product is returned postage prepaid to Hy Gain with a personal check cashiers check or money order for 8 00 covering postage and handling 3 Under no circumstances is Hy Gain liable for consequential damages to person or property by the use of any Hy Gain products 4 Out of warranty Service Hy Gain will repair any out of warranty product provided the unit is shipped prepaid A...

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