Hy-Gain TH-2 User Manual

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INSTRUCTIONS FOR HY-GAIN TRI-BANDER MODEL TH-2

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The HY-GAI N Thunderbird tri-banden are three band antennas designed for 10,
Mulfi-banding is accomplished through the use of the HY-GAIN "SOLID STATE" Slim Line Traps

which isolate various sections of the antenna,

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B.

MOUNTING

3'

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All HY-GAIN communications antennas are designed to

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highly recommended for mart use.
for larger outside diameter masts can easily be made through the use of standard couplings and

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nipples.

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effect of surrounding objects

Extensive experimentation at our antenna range has pointed up the fact that these effects ca&'
be very serious and the problem of getting the antenna in the clear of surrounding objects is a*:'
very important one.
objects of considerable mass
therefore highly recommended that one of the

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positioning of the array as far away as possible fro
additional transmission line, with the accompanying
over the close proximity of surrounding objects.

C. HEIGHT

In general, any antenna system operating above 14MC should be at least

If

:

1

5

and 20 meters.

At

a 1 5/8IB outside diameter mast. The

1/4"

inside diameter steel galvanized plumbers pipe (which is 1

It

is very strong and also relatively low in cost. Adaptation

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IS

EXTREMELY IMPORTANT that the antenna be mounted in the clear. The detrimental

is

often underestimated in the average antenna installation.

It

should be pointed out in particular that power lines and other metal

or

length will deteriorate the performance of any antenna,

first

considerations

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mounted on a house or building, the antenna should be at least 20 feet above the roof,

5/8"

outside diameter)

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any antenna installation be the

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40

feet

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ve ground.

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D. LIGHTNING PROTECTION

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Your antenna installation may be adequately protected from lightning
base of the tower or mast which supports your antenna,

copper or aluminum wire running directly and by the shortest path to a 1/2" x 8' copper clad
steel ground rod driven into the earth. ,411 other grounds, for example, water pipes, vent pipes,

etc. should be avoided. The chassis of your transmitter should also be grounded with a similar
grounding system.

E.

STACKING
It

is

not recommended that any antennas which are resonant below 30mc be stacked or mounted

near the Tri-Bander. This includes doublets and verticals as well as beams.

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50MC or higher) when mounted at least 8 feet

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its operation. However, the &-Gain Model

or below the TH-2 without any adverse detuning effect.

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if

you properly ground theL

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proper ground consists of

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VHF beams (on

away

402B,

from the Tri-Bander, will not seriously affect

40

meter beam may be installed either 10' above

#8

or larger

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The HY-GAIN TH-2 may be rotatea oy neavy duty TV rotators in winds up to approximately
40MPH. In higherw~nd areas, the HY-GAIN Roto-Brake

is

recommended.

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MECHANICAL SPECIFICATIONS

Boom Length
Boom Material
Boom Outside Diameter
Longest Element
Element Diameters
Element Material (Alum.)

Net Weight (Lbs)

Wind Surface
Wind Load at

ELECTRICAL

Gain
Front to Back ratio In DB

Typical SWR at resonance

Maximum Power Input

Maximum Power Input (AM)

.Front to back ratio will vary considerably with height abwe ground and the proximity of surround­ing objects. Front to back ratio

wave front. Maximum front to back ratlo

Approximately equivalent to plus or minus 1/2 of 1% of the operating frequency.

SPEC

in

(Sg

100

IFlCATlON

DB

over

.

Ft.)

MPH

S

1/2

wave dipole

(P.

Ee

P.)

is

also dependent upon the arrival angle of the radio frequency

is

maintained over only a very narrcw band of

6'

Aluminum

2h'

26' 11"

1

1/8" to

6063T832 Al l oy

19

2.86

85.9

3/4"

frequencies.

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The element length and spacings were very carefully experimentally derived at our antenna test
range. They are shown for either phone or CW operation in a sketch of the antenna in another

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THE BETA MATCHING SYSTEM
The exclusive HY-GAIN Beta matching system is completely factory pretuned and requires no

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back about
to the driven element input terminals ae shown.
COAXIAL CABLE

TRANSMISSION LINES
The HY-GAI N TH-2 is designed for

LENGTH AND SPACINGS

part of
further adjust the paradtic reflectors and/or directors. The antenna will perform within

its

surrounding objects.

further adjustment. The Beta matching line

is

this

manual.

electrical specifications

attached as hown in Figure

7

1/T

line runs are

ss

cnd will handle

It

1s

recommended that these figures be used and

if

and attach soldering lugs.

TO

PREVENT MOISTURE FROM

short

1

KW

thot

no attempt be made to

it

Is

mounted at least

is

2.

Simply strip the center conducustor and shield of the coaxial cable

use

with

52

and pawer levels do not exceed 100 watts.

of

RF

power.

40

feet high and

mounted and the

SURE

2).

TO

SEAL THE EXPOSED END OF THE

lNSlDE THE PLASTIC COVERING.)

(See Figure

(BE

GETTING

ohm coaxial transmission lines.

relatively

52

ohm

coaxial feed line cable

The soldering lugs are then connected

RG~/U

in the clear of

RG-https://manualmachine.com/U

has relatively

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Special "Polyfoam" type RG-https://manualmachine.com/U and RG-8/U coaxial cables are highly recommended because of

their lower relative losses and constant impedance characteristics,
When originally laid out, the feed

(for proper transmitter loading on all bands,

necessary

high and relatively In the clear of surrounding obiects, an

An

SWR

line losses, As

objects and many other factors will affect
ASSEMBLY INSTRUCTION FOR MODEL TH-2

Before assembly begins, all parts should be checked against the parts sheet. When assembling, keep

all telescoping sections free from dirt and grit, Supplied with the antenna

is

This
ductivity.
an electrical connection

a

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ine should be a little longer than necessary, to facilitate pruning

if

necessary), Pruning of the feed line

if

transmitter IoadSng

of 2:l or less at resonance is considered very good, and results in negligible transmission

is

well known, height above true electrical ground, the proximity of surrounding

specially

It

compounded material which

should be applied to mating surfaces at all telescoping sections and other parts where

is

made.

is

either too heavy or too light,

SWR

readings at any given installation site,

is

an oxidation inhibitor and increases electrical con-

If

you antenna

SWR

of 2:l or less at resonance will result.

is

TH-2

is

sometimes

is

at least 40 feet

a iar of ELECTROSEAL.

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The element lengths for PHONE and CW operation may be found on Page 6. This figure gives the
element section dimensions for all elements,

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The two element Thunderbird Tri-Bander should be assem~id in the following steps:

.

Driven Element Assembly

1

2. Ref lector Assembly

3,

Boom Assembly

1, DRIVEN ELEMENT ASSEMBLY

All parts relating to the driven element are bundled together and marked with printed tape. Refer
to Page
hoist

impossible to completely assemble the antenna on the ground, (because of obstructing wires or trees,)
the boom to driven element bracket with sections DElA should be assembled on the ground and the
outer end sections inserted when the boom is on the tower.

Refer to Figure 5 which shows the boom to driven element bracket assembly, The point of attachment

is
ride over the boom and are secured with nuts on each end. The 1/4" bolts also pass directly through
the boom. Part DE2 1s lnserted into part DElA and secured with

Part

BE

6,

Figure 6,

it

into position on a tower or pole,

marked with printed tape, The two 1/4" formed bolts are assembled through the two brackets and

3

Is

the 10 meter slim trap, and

SURE TO

INSERT

If

it

is

possible completely assemble the entire antenna on the ground and then

it

isr

of course, the most desirable,

1

1/8" alum hum tubing clamps.

is

inserted into

THE SHORTEST LENGTH OF TUBlNG EXTENDING FROM THE SLIM TRAP INTO

part

DE2 and secured with a 1" tubing clamp,

Ift

however,

it

0

-secure until Part 5 (the 15 meter slim trap)
attained, then secure with 1" tubing clamps. The 15

MANNER AS THE 10

with 7/8" tubing clamps.

METER

SLIM TRAP. Into the outer end of Part 5, insert Part DE6 and secure

is

inserted into Part DE4, and the proper dimensions are

METER

SLIM TRAP

IS

INSTALLED

IN

THE

is

SAME