Hy-Gain TH-11DX User manual

5-Band
Super Thunderbird
Model TH-11DX
Instruction Manual —
|
—
hay-gqain
®
308
Industrial
Park
Road
Starkville,
MS
39759
USA
PH:
662-323-9538
FAX:
662-323-6551

TABLE OF CONTENTS
Page
CHA
PTB
sicnticw
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ckniieateneaiels
idebdiniesecuteeiaioneenttriceaten
1-1
General Description ............c.ccccccsssssessssssssssessesseseees gdestectenedesececetarcess Iutgons wen gatlca ieee aah 1-1.
PEC MIC ANON Ss scitessital ides actesttverstascecce icxstchtale delves bes seceauledasitatshsvactansatdesdesicusatiubusestevedeomiscteveceaeteens 1-1
Theory Of Operation..............cccsccscscessceseresecesseesseecesseees ere Ta er eT UT aR ene ee Rudedars 1-2
CHARTER
2
vcs
sescccecstvesspasciearnsacentotsnsceess
BS
eens
wescesa
yeu
ecusoneteaas
i
aseeeeca
yeaa
MaNelisesh
ies
ee
ee
en
ere
2-1
Pete par aliors Or ASSO EY sce w, Soa zeshceve oconeste tector ccc tea eda doatesaeteaaeo eons GlsdeLicb a eseeneean 2-1
CHA
POEL
SD
srecsscsecssdnsotvsecsceastetetnaces
acest
dik
tN
eccu
east
cosines
os
hire
Maecenas
3-1
Assembly of the Boom and Boom-to-Mast Brackets ..............:.cccsscssccssscsscsessssssccsscessssssesccsessscesceneees 3-1
Assembly of the Element-to-Boom Brackets on the Boom............ erecaieee eels s aL hai thst eetins 3-2
Installation of Tubing Clamps on Element...............cccccccssessesccsceseceseescesccssccssessecscsssccsssecsesscesscssssssees 3-3
BC Ie REA SSE BLY spies coasts sees nceahs ize At cae Sacsaet ects oeAvansiocseessveeiieasausaseteiceateean sed bsttes aust een 3-5
Installing Elements On the Boom <cccvises. sexcacaed siocecscieketece s50a5oes tutescuceutcecsdecacutesitdeledusk avedaivecsndeebeateaates 3-9
Plrasing: Tid be ASseim Bly csisce cuts oe cd osteateeasched av tte sects ecsarsans ohsdaneaghas at oeeciews ted masculine, 3-9
Boom Support Assembly ..............ccssscssccssessescececesssssesccesscseseseees Paceline ata cn a eee 3-13
6 V9 ool 5 ee ean PRO ee SEE een Pe st eR eae DMP PD OTE ree ER OTT 4-1
PEN Ma INSTA AON xs scstecsa sate Socancethe saizedc us cous vartecdoenchd cueuiesvtniesietelucasabusthatencs Gaeiee ieee ae 4-]
Installavon oma Crank-Up POW: cccciccassjesscceccesssttesesesescrsecdsaneceu lets daviesnystoeetextcn Sndbsaandenteatiasesuteenuee 4-]
OMREE EVES OF RO WETS se ccsctses casi ee pad ass cad eum es ced ened es osctods Sespteea ds icaes cates basboce oars acne nascoed lata te testes 4-1
Atiachinent Of Pee line: s.gsescicasacactesteusiceaxesacsatin tzesotes os ccesce Sessuavstnssecee secuisehel teseua rave donated ania 4-1
Attaching the Antenna to the MaSt..............cccsssssesccesesseeesensessecsecesesnsssecsccsscsecsecccceeccsaceaccresccascecesavess 4-]
TETSU PEO VECO Mi eae acc nda icesatace eu co ec ss eas acca auc eecas tse Pata Uaessts ips ve lusc eee anone cath ake: 4-2
VSWR Curves............ batguasgaceataeet a camaavees Mtcnashat cesarean Doss eosin less vbadad Nance eae vaetente eeeee eee 4-2
VOW ER CATS oo cette vo sttnve cated che uattsueasiaueadairuncetwasud saeasieodaenssaass acoead us vatgasosn deacon geceeclosstidendaates 4-3
a oF) a BO | ae erreur ee em OT DenRA ee CER INTE Tree PEST RE ENS ae Ee 5-1
CPE GAOT yeas esccqnses areas se arauetecuvereacsman er taebaecuducieses ata tet eta sale es edhe tis asked raat det 5-1
IAAI ADCS soc ctceoctlaceectysee.wsnatccececestcastect nasaususiaax Oiewlsiauyosvsnluasae conmttuastseacaaancestescuses ecu cueel audasocasauesntes 5-2
CHAPTER 6. BR als ate eal ac tah inh eras Sean ale nals iit e ad seen caus ca ete uRe cna been teas dod Masuda bvaceadsaosiacenaies 6-1
TROUDICSNOOUNG iin nteostnien laces lice data eivebsensudareete auhad car cacadcan ceva ouauacuae wa leniueaacs deat ils 6-1
AP TOUDICSMOOUM DAC NRE act 18 coke lee hh ce ha ala chenas Lyle Siete es andl ach l es rate eaten te canaasceices duane 6-1

TABLE OF CONTENTS (Cont.) |
-ii-
Page
CHAPTER
7............
mahuteanaeacunaeetes
ida
ecseuecees:
i
decses
etc
n
isp
Sea
dis
Gasset
ssveaeulhena
Vetascoassdiod
te
cuaveveneabeetedaaasates
7-1
SERVICE LEO ELON Ns coiee cei se vas decena ce es ooenna nec em ences eauee tesa seseeees voveaant dass suiaappeanPeaapeinoces ere ee aeeacnais 7-1
Converting American Measurements to MEUric .............sscessceseesscescesscseesssesscceneesecesesseceneeseseneseasensenes 7-2
Blt avid Nut SiZeS vsstgsaccesttacexedetccnncuuencatcnsvatelede steve itacuael cu aadasiestedevase coryennachaseas cassie seats tae umansoateees 7-2
Waiter Bie iaicieeciedta eo ncttteete a aca elects eee 8-1
PEE S 1S tose est casa ceaauda ase Setes ascan baal ouceeenseut ccd acuatcouusiacuesaceveecdseaucola siatghs eauseeaaaconcioacceeeeets aap eames 8-1
LIST OF ILLUSTRATIONS
Figure Page
I BOOmAG= Mast BraCKel xa, e.cciecacvecavocvennsetsciisiunatees caeeshosianeen shen doav desde tartan secpoere as eeaense eats 3-1
2 Assembly of Boom and Element Spacing ............:sssssssscssesesssecseeceececeeceeeteeseetsceeecseeeees 3-2
3 Ficment-t6- BOOM: Brackets ® oss ocac secs. ccc tesvagu daha sas ceenes Sets sceiis nha etcennspatileuectedeecneeneeads 3-3
4 Tb tee Tea 0S acces ceca scac aed awa seng sede ace ees ta od ade cE eat senses 3-4
5 Element SCcuOn: DeSCr DUO M aeicsscacsics svees sewer sesed ede ail eee eos aiees dovagatolee cantetnasetes dadteeastes 3-6
6 Exposed: Dubin o Len geis rai reste cesses aosacasensnaesteacs A saanatsNcaenveas vis AO ovations amedan suseeeaseons 3-7
7 ROPE WaMIPeNer: esc s etre ens cones ste seieas cess cosudsepnc reotlicedtacs deel es et lu gaateetaceiniCecatteaptea sdseenes 3-8
8 ap Dba, say sl esteh we cascre ds cteetcat peaysacs sbscche ba cece tenes cheesy gevGamndut yi vedaadunsspaseeeiutacoetaneteisees 3-8
9 Phasing PubeeAsse mb bys ccceisas ss deeodatenn oboe race elute arsed tials casei ex 3-10
10 20 and 17 Meter Pigtail Wire Attachment ..0....0.... ee eee eeseeecseeeseceecsssescnsseeseseaeenseeens 3-11
11 10, 12, 15 Meter Pigtail wire and Balun Attachment......0.........cecseeseseeeceeeeeeeecceceeeeneeeees 3-12
12 BOOtil SUppOlt ASSEMBLY 2c casie tice oe wieas cates roves accu coh adegeeaasancncenioassecnceoscsebessmaiuceses 3-13

CHAPTER 1
General Description
The Hy-Gain TH11DX is an 11-element, 5-band
beam antenna designed for broadband, high-per-
formance operation on the amateur 10,12,15,17,
and 20 meter bands. The TH11DX features a log-
periodic dipole driven array for all bands. with
monoband reflectors for 17 and 20 meters and
trapped directors for 10,15,17 and 20 meters.
The TH11DX is supplied with the new Hy-Gain
BN-4000 high power balun. These standard fea-
tures contribute to produce a maximum power
rating of 2000 watts continuous-duty, 4000 watts
PEP on all modes. The TH11DX also features an ~
improved wire boom support system. All-stainless-
steel hardware and clamps are used on all electrical
connections.
Specifications
Electrical:
- Band2s............. pa bedecaaealtdeecs de HacsuaauetierweclesaituaeesatiaiUeiatavcte, iaeasnanmeaneen: 20,17,15,12,10 meters
Bandwidths (2:1 VSWR)
DO INGIRE cisvestsseniier ds coccsee eee A ots ieee G cca oleae ast Vie ees: ceetdesa 350 KHz
MT ACCES sas css cece Spa scccat dea p toes t aca se dopins assesectvees dunes extane nieaveadedteaedaesene tc eeeits 100 KHz
PSCC UGE a: tecspsceedessciee nc cecaviv sien docepeet es canseec ts ansee eI ee a ton eRe caieae Seca atone 450 KHz
| 5 (=| eee oe ee eRe OE TNR EE eS Pee Re RE Td PRAT oe oR ee earn DS ONT ee Te 100 KHz
| CON 50 cic: gee Oe EMCI NEE eet SRE TERN Pd Sot et mee Nee SO UA Re ROT eo OPE ae 1200 KHz
Maximum Front-to-Back Ratio
PL UAT (cl [cl eee aoe PE SECRET Ett Pe a ORES Pee Nt a Oe SUEY B AUER MAL TARR AN TRUE UEC IENA 27 dB
DP ICU RE casero cst ed eas Sacto dcgut sods Sess satu susidece ion dn dice tausatns areates ce padnudcscatetoctdeceaeinen: 22 dB
CSAIL as dis esses Se Race css case case's tse noes ade paaacecesces beacaea ra ediea ieee scladed eats acento seek, 25 dB
DN saath pt erec sac g alge titotk cea ese nsid fe vasltos cede cute anes sian caiascoamensaeune tae stit nie eae 15 dB
MO) PEC gO asa is ta sth Ses eta te set 8 eas eas i Ra aetna acca a 19 dB
Maximum Gain
ZO TNGUEE Becec, ceca eed sex astae acaba cere cosh lee achanastca dates acu sesendoecetletestnase 8.6 dBi (6.4 dBd)
* SPT TINGUGE soucci ict ecunesd vase eilaacdes wes seaaee ces hea ocaeaaaeeeeaus et escisose Rneateveesee’ 8.4 dBi (6.2 dBd)
ES TRICUOE os scts eu oadsa canes ctaceuee eas ches ceanren tas nascent ae ee las tanec 8.1 dBi (5.9 dBd)
DG i eee pct toca tcse Somnus wese ans rations Soe wen ase 7.5 dBi (5.3 dBd)
| 101 =) (or ae eee Pie et Re price 2A mTT Da Oetker nS 9.2 dBi (7.0 dBd)
Miaximuint POWeGR 2 oscccceessscd csi caseessstacesnss esseonsarea i neaaa ny om aust Gteoweeticaeedaaeeds 2000 watts Avg.
| ; 4000 watts PEP all modes
Recommended Transmission Lines ..............sssscssssssssssssssseseseacsesesessseees RG-213/u, Belden 8267
f.
{
NOTE: Belden 9913 is NOT fecommended.
-
1-1

Specifications (Continued) —
Mechanical:
Boom
Length
.........ccscccssceseees
desteoibhcpsateGesaseres
acta
neve
Mechs
PN
tat
a2
24
feet
(7.32
m)
BOOM
IAPC
OD
5
oyachacas
cence
scdss
cacdes
slasidiceasssindactabisclsucteaGteciebesoutsnencne
Bice
2
inches
(5.1
cm)
EOMBOSt
BEC
NG
55s
fo
fae
sel
pavcutsesoh
es
sase
eccqucetectecaers
Separated
aaseecneueen
ce:
37
feet
(11.28
m)
Turning
Radius.................0....
Uindghasvh
chew
cuileduteceedwencicisetesat
A
Giiess
Dianna
aes
22
feet
(6.7
m)
PICCEPIS
WAST
acs
a
saces
oct
GhscasiNishusaccestede
easneiteseebee
soto
evesdice
1.9"
OD
to
2.5"
OD
(51
to
64
mm)
INCE
WV
SUG
sc
isso
ctices
sa
Leuwsacecsh
an
tactostenssaueierdcwas
ccsedessdte
ices
cocoscuaceoie
eee
ieestcsenitss
88
Ibs.
(40.0
kg)
Shipping
Weight
..0...........cccsssssssessseesssseesecsseeseees
esuateeSevatedee
PAE
UPS
ee
ee
98
Ibs.
(44.5
kg)
Maximum
Wind
Survival
(no
ice)
BS
ONE
chk
ar
eststen
fs
caatee
renee
noses
oc
aeeh
one
eiatsst
olla
barter
on
alesis
Ps
nants
119
mph
(192
kmph)
REIGMICNISS)
cocexssslsneaciceaanes
sdaissscletaspetates
Weta
ghiacianitine
mec
eee
ut
tea
99
mph
(159
kmph)
Wind
Surface
Area
(max)
..........ccscccscecssseccccesessescccscsscscscsscsscecesecceseecece
12.5
sq.
ft.
(1.1
sq.
m)
Maximum
Wind
Load
at
99
mphouuu.
cs
eadseceseccecsleseccssceatecessecsscsscccsesceecece
490
Ibs.
(222
kg)
Element
Tubing
Clamps...............ccccscssesscsssscescssscssscssssceccesceseecensssesesnceneseesene
All
Stainless
Steel
EAU
WAC
cnn
sfc
so
50
to
zee
hus
wsada
ce
sesuse
cubs
adh
daan
ebesendeseictGee
oie
Matador
uations
All
Stainless
Steel
OOM:
SUPDOK
ee
asacee
eer
ietidecocsiavcoradetsiediseenoen
oercasaseeascae:
0.125
inch
galvanized
aircraft
cable
SULLA
DIS
ROLAIOES
icc
scnscsiensaccesesavxou
aon
ddevoeendedetecbatasseivesivesds
Hy-Gain
HDR-300,T2X
or
Ham
IV
Theory of Operation
The TH11DX uses a 6 element log-periodic dipole
array as the driven-element array. This provides a
very low loss, high power driven array with
moderate directivity above 18 MHz. Two resonant
driven elements on 10 meters gives broad
bandwidth on 10 meters and greater F/B on 12
meters.
Separate single-band reflectors on 17 and 20 meters
provide excellent F/B. Trapped directors operate on
10, 15, 17, and 20 meters. Two of the three directors
use 10 meter traps for less inductive loading and
less loss. Directivity on the 12 meter band comes
entirely from the log-periodic array, since a director
for 12 meters would act like a reflector on 10
meters.

CHAPTER 2
Preparation
for
Assembly
FOR
OUR
OVERSEAS
CUSTOMERS:
The
United
States
uses
American
units
of
measurement.
Please
see
page
7-2
of
this
manual
for
American-
to-metric
conversion.
When
unpacking
your
antenna,
check
inside
of
all
tubing
for
smaller
parts
and
traps.
To
conserve
space,
these
smaller
parts
are
sometimes
packed
inside
larger
pieces.
Check
all
parts
against
the
parts
list
to
ensure
no
parts
are
missing.
The
hardware
supplied
with
this
antenna
is
bagged
by
thread
size
for
your
convenience.
You
may
want
to
sort
the
aluminum
tubing
for
the
elements
before
assembly.
This
makes
element
as-
sembly
much
easier.
the
following
table
shows
the
various
element
tubing
sizes
and
quantities.
Tubing
Size
Quantity
Shipped
1-1/4"
x
48"
w/insert
1-1/4"
x
35”
wiinsert
1-1/4" x 35"
1-1/8" x 48"
1-1/8" x 38"
{tx 21 1/2"
J
etxss”
merxaay
|
1/8" x 24"
7/16" x 62"
16" x 58"
_
merxsss
[6
7/16"
x
17-1/8"
|
orxes"
[a
Choose
a
large,
clear
area
to
assemble
your
TH11DX
antenna.
The
area
must
be
at
least
24’
x
37’
(7.3m
x
11.3m).
You
may
wish
to
use
a
tem-
porary
mast
or
sawhorses
to
support
the
boom
during
assembly.
A
concrete
driveway
is
an
excellent
area
for
as-
_
sembly.
If
you
assemble
this
antenna
over
a
grassy
area,
precautions
should
be
taken
so
that
hardware
is
not
accidentally
lost
during
assembly.
We
have
included
some
extra
small
parts
with
this
product,
just
in
case
some
are
lost.
All
tubing
supplied
with
the
TH11DX
telescopes
together.
Make
all
measurements
to
the
given
dimensions,
plus
or
minus,
no
more
than
1/8
inch.
We
suggest
that
the
assembly
of
this
product
be
done
over
a
2
day
period.
We
further
suggest
that
you
read
this
manual
thoroughly,
in
its
entirety,
and
then
go
through
the
manual
a
second
time
and
identify
and
familiarize
yourself
with
all
of
the
antenna
components.
Start
assembling
the
antenna
when
you
are
prepared.
A
few
hours
invested
in
the
assembly
process
will
ensure
many
years
of
satisfaction
with
the
TH11DX.
NOTE:
An
extra
page
that
contains
Figures
5
and
6,
Element
Section
description
and
Exposed
Tubing
Lengths,
has
been
inserted
in
this
manual
for
use
when
assembling
the
antenna.
If
you
live
near
a
sea
coast,
please
follow
the
additional
instructions
contained
in
the
"Main-
tenance"
section
of
this
manual.
2-1/2-2 Blank

CHAPTER 3
Assembly
of
the
Boom
and
Boom-to-
Mast Brackets
Select
the
boom-to-bracket
clamp
parts
(Item
Nos.
89
&
90).
Loosely
assemble
them
on
ends
(Item
No.
79),
as
shown
in
Figure
1.
Line
up
the
holes
on
both
brackets
and
both
boom
ends.
Secure
the
two
brackets
together
with
four
(4)
1/4"-20
x
3/4"
bolts,
lockwashers
and
nuts
(Item
Nos.
34,39,
and
38).
Secure
the
brackets
boom
ends
using
the
5/16"-18
x
2
3/4"
b
washers
and
nuts
(Item
Nos.
28,
31
Tighten
these
six
bolts
securely.
The
casting-to-
boom
bracket
(Item
No.
90)
may
deform
slightly
Assemble
the
two
cast
aluminum
brackets
(Item
No.
82)
on
your
temporary
mast
at
about
4
feet
above
ground.
A
five-footlength
of
2"
ABS
or
PVC
plastic
drain
pipe
makes
an
inexpensive
temporary
—
mast.
Secure
the
two
brackets
together
using
the
two
(2)
5/16"-18
x
3"
bolts,
lockwashers
and
nuts
the boom
to
the
two
(Item
Nos.
27,
31
and
29).
Tighten
these
two
bolts
olts,lock-
evenly
until
the
brackets
are
snug.
and
29).
You
should
drill
a
5/16"
hole
through
the
mast
at
the
center
hole
of
the
mast
bracket
and
secure
usin
g
when
the
four
1/4"-20
x
3/4"
bolts
are
tightened;
a
5/16"-18
x
4"
bolt,
lockwasher,
and
nut.
(Item
this
is
normal.
No.s
30,
31
and
29).
This
bolt
will
prevent
the
antenna
from
twisting
on
the
mast
in
high
winds.
NOTE:
See
Figure
1.
If
you
use
a
galvanized
1
1/2"
ji
schedule
40
or
80
pipe
as
a
26
-
31-29
peers
mast,
it
has
an
O.D.
of
1.9".
You
will
need
to
put
two
split
28
-
31-29
79
2
lockwashers
under
the
5/16
=
nuts
on
the
four
long
bolts.
i
eo
\S
30
-
31-29
=
(OPTIONAL)
~~
ae
27-31-29
Gr)
-_—
SH)
= at
-_—
79
Item
No. Description
26 Bolt, hex head, 5/16"-18 x 5"
27 Bolt, hex head, 5/16"-18 x 3"
28 Bolt, hex head, 5/16"-18 x 2 3/4"
29 Nut, hex, 5/16"-18 .
30 Bolt, hex head, 5/16"-18 x 4"
31 Lockwasher, split, 5/16"
89
re |
34 - 39 - 38
\
~O-~@.\
90
MAST (Supplied by customer)
(1.9" to 2.5" diameter)
Item
No. Description
34 Bolt, hex head, 1/4"-20 x 3/4"
38 Nut, hex, 1/4"-20
39 Lockwasher, internal, 1/4"
79 Tube, Boom, 2" x 79 1/2"
82 Mast Bracket, cast aluminum
89 Clamp, Boom-to-Bracket
90 Bracket, Casting-to-Boom
Figure 1
Boom-to-Mast Bracket
3-1

1 i '
.
67
68
79
62.
|!
90:
79
erat
88
67
:
J
el!
\
{
FRONT
|
ET
CA,
i
ES
EE
SS
[eSesnnsaccssssses:
REAR
24"
24"
29"
517i
T2010
24"
28"
57"
43"
ITEM
84
ITEM
84
ITEM
84
ITEM ITEM ITEM
84 884 84
20R-17R
1.092
m
a
keoews
17R-20DE
1.448
m
;
20DE-17DE
0.711
m
17DE-15DE
0.610
m
15DE-12DE
20.5"
0.521
m
12DE-R10DE
0.445
m
R10DE-R10DE
0.381
m
F10DE-15D
0.737
m
15D-20D
0.610
m
20D-17D
24"
0.610
m
Item
Item
No
Description
No.
Description
35
Bolt,
hex
head,
1/4"-20
x
2
1/2"
82
Mast
Bracket,
cast
aluminum
38
Nut,
hex,
1/4"-20
88
Tube,
Boom,
2"
x
69
1/2"
39
Lockwasher,
internal,
1/4"
89
Clamp,
Boom-to-Bracket
67
Caplug,
2"
90
Bracket,
Casting-to-Boom
79
Tube,
Boom,
2"
x
79
1/2"
Figure
2
Assembly
of
Boom
and
Element
Spacing
Attach
the
boom
and
bracket
assembly
to
these
two.
brackets
using
the
four
(4)
5/16"-18
x
5"
bolts,
lockwashers
and
nuts
(Item
Nos.
26,
31,
and
29)
as
shown
in
Figure
1.
If
you
have
problems
aligning
all
of
the
holes
in
the
brackets,
you
may
wish
to
carefully
run
a
5/16"
drill
bit
through
these
holes.
Do
not
enlarge
these
holes
beyond
5/16"
or
you
may
weaken
the
brackets.
This
will
prevent
align-
ment
problems
that
might
occur
on
the
top
of
your
tower!
‘Tighten
these
four
bolts
just
enough
to
hold
the
weight
of
the
antenna.
Slip
the
two
remaining
boom
sections
(Item
No.
88)
over
the
two
swaged
ends
of
the
assembled
boom
and
secure
using
a
1/4"-20
x
2
1/2"
bolt,
lockwasher
and
nut
(Item
Nos.
35,
39
and
38),
as
shown
in
Figure
2.
Assembly
of
the
Element-to-Boom
Brackets
on
the
Boom
There
are
two
sizes
of
element-to-boom
brackets
supplied
with
the
THIIDX
antenna.
The
largest
(Item
No.
85)
has
a
1
1/2"
I.D.,
and
is
used
only
on
the
two
longest
driven
elements.
The
remaining
brackets
(Item
No.
84)
have
a
|
1/4"
L.D.,
and
are
used
on
both
the
four
front
driven
elements
and
the
parasitic
elements.
The
largest
brackets
(Item
No.
85)
are
stam
ped
with
the
number
14,
while
the
smaller
brackets
(Item
No.
84)
are
stamped
with
the
number
13.
3-2

Item
Item
No.
Description
No:
Description
32
Bolt,
hex
head,
1/4"-20
x
3/8"
39
—_
Lockwasher,
intemal,
1/4"
34
Bolt,
hex
head,
1/4"-20
x
3/4"
TL
Insulator,
Driven
Element,
1
1/2"
O.D.
37
Nut,
square,
1/4"-20
72,
Insulator,
Driven
Element,
1
1/4"
O.D.
38
Nut,
hex,
1/4"-20
84‘
Bracket,
Element-to-Boom,
#13
_,
85
Bracket,
Element-to-Boom,
#14
_
Figure
3
Element-to-Boom Brackets
Assemble the brackets as shown in Figure 3 and
locate them on the boom assembly as shown in
Figure 2. It is easier to assemble the brackets on
_ the boom at the correct location, rather than try to
slide them on the boom. If you are going to leave
this assembly unattended for more than 15 minutes,
we suggest that you tighten the eight (8) bolts on
each bracket, so that they do not vibrate off. Do
not
tighten
the
two
(2)
anchor
bolts
(Item
No.
32)
until the elements are installed and aligned.
Do not install the top anchor bolts in the 17DE,
ISDE, 12DE, and R10DE brackets. The phasing
tubes will be installed over these brackets in a later
Step, and the top anchor bolts may short the phasing
tubes at these element locations.
You
may
want
to
mark
the
bracket
location
on
the
boom
with
an
indelible
marker.
You
can
quickly
realign
the
brackets
to
these
marks
when
you
install
the
elements
to
the
brackets
in
a
later
step.
3-3
Installation of Tubing Clamps on Ele-
ments
Select the proper size tubing clamps as shown in
the Figure 4. When installing the clamps, place the
clamp near the tube end with the top of the clamp
over the slot in the tube as shown in Figure 4. 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.
DO NOT overtighten! Also, if you loosen and
tighten a clamp more than 5 times, we suggest that
you replace the clamp. After repeated tightenings,
these clamps may become difficult to completely
tighten. Should you need to replace these clamps, —
use Only high quality stainless steel clamps to en-
sure proper torque.

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3-4

Element Assembly
The TH11DX can be optimized for three different
settings. The "Phone" setting optimizes both the
VSWR and patterns for the US phone section of
each band, and is also the preferred setting for
full-band coverage. The "DX" setting optimizes
both the VSWR and patterns for the low end of each
band including the US CW sections. This is
generally the best setting for overseas use. The
"MARS" setting provides broader VSWR
bandwidths for the 20 and 15 meter bands, without
affecting the other bands. There is no difference
between settings on the 12 and 17 meter WARC
bands, since they are very narrow. When you as-
semble the elements use the following table to set ‘
the TH11DX to one of the three settings. See page
4-3 for typical VSWR charts.
= ‘
Phone Setting
| A__|_53.50" (1.359 m)
i
id 2
.
~
C
22.25"
(0.565m)
:
Use Figure 5 to select the tubing for each element.
If you previously sorted the tubing, this step will
be much easier. Each element uses two identical
element halves; assemble both halves of each ele-
ment at the same time.
DX Setting
The element abbreviations and descriptions are:
' 20R = 20 meter reflector
_ 17R = 17 meter reflector
- 20DE = 20 meter driven element
- I7DE = = 17 meter driven element
- ISDE = _ 15 meter driven element
12DE = = 12 meter driven element
. RIODE = _ rear 10 meter driven element
FIODE = front 10 meter driven element
15D = 10/15 meter director
- 20D = 10/20 meter director
17D = 10/17 meter director
Assemble the elements in this order. Select the
tubing for the two 20R element halves and as-
semble them as shown in Figure 5. Do not tighten
the clamps yet.
| MARS Setting
cf 46" 168m) | 45.50"0.156m) | 45.50" (1.156m)
DB _ | __25" 0.635m) | 26.50"(0.673 m)__ | _—26.50" 0.673 m)
; 22.50" (0.572 m)
81.625" (2.073 m)
e
.
.
°
: 21.50" (0.546 m)
Accurately measure the exposed tubing lengths as
shown in Figure 6, starting at the boom end of one
of the element halves. In Figure 6, metric dimen-
sions are shown on the left and American dimen-
sions are shown on the right. Tighten the
appropriate clamp after each measurement. Repeat
for the other element half. Double-check all the
measurements before you proceed. You may want
to mark each element half with its abbreviation (for
example, 20R) so that you can easily find the
correct element in later steps. Set the finished ele-
ments aside.
Repeat the preceding paragraph for each element.
Remember that the 20R and the 20DE use 1-1/4"
tubing with strengthening inserts at the boom end;
make sure to use the correct tubing for these sec-
tions.

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ROPE
s
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2,
CO
DAMPENER
CAPLUG
Figure 7
Rope Dampener .
4
TOWARD BOOM
DRAIN HOLES -
TUBING CLAMP -
No. 10
4 TOWARD BOOM
DRAIN HOLES
TUBING CLAMP
No. 10
PART No. LABEL
- PART No. LABEL
The two reflectors and the six driven elements
require dampener rope in the last tubing section
(the 7/16" tubing at the end of the element). This
rope prevents low-frequency oscillations that may
occur at low wind speeds. Select the dampener rope
(Item 83) and cut it into sixteen (16) equal lengths
of 45" (1.14m) each. Slip one length of rope into
the outside end (the 7/16" tube) of an element half.
With about 1/2" (13mm) of rope extending from
the element half, fray the rope into individual
fibers, and then fold the fibers back along the
outside of the tube. See Figure 7. Slip a 7/16"
caplug over the element end and rope fibers and
push the caplug so that it is secure. Repeat this
procedure for each of the sixteen element halves for
the reflectors and driven elements.
398S008
40 METER TRAP
Y ‘ barf lice LE ; :
10.OR 15 METER TRAP
Figure 8
Trap Detail
3-8

The driven elements have insulators on the boom
end. The 20DE and 17DE use a larger insulator than
the other four elements. Select the driven element
insulators and install them on each of the twelve
driven element halves. Make sure that the in-
sulators are pushed all the way on the element
halves.
When you assemble the trapped director ele-
ments, make sure that the trap drain holes face
the ground and that the trap part number labels
are on the boom end of the traps. Also, on all
tubing attached to the traps, make sure that all slots
are facing the ground and that the small drain holes
are aligned with the slots. Make sure all trap-cap
insulators are firmly seated against the trap before
measuring the dimensions. See Figure 8. Install
7/16" and 1" caplugs on the ends of the remaining
elements. Select the 2" caplugs and place one on
each boom end. Double check the exposed tubing
measurements against Figure 6.
Installing Elements on the Boom
You should now have 22 completely assembled
element halves. Insert the 15DE element halves
into the 1SDE element-to-boom brackets, and then
tighten the eight 1/4"-20 x 3/4" bolts until it is
difficult to rotate the bracket on the boom (make
sure the anchor bolt on the bottom of the bracket is
very loose!). Align the 15DE so that it is parallel to
the ground and perpendicular to the temporary mast
(which is perpendicular to the ground). If you have
a flat assembly area, you can use visual references,
such as corners of structures and horizontal lines in
exterior walls, to align the element. You can also
ask a helper to hold a carpenter’s square against the
temporary mast as you "eyeball" the horizontal
alignment. It is important to position the boom as
parallel to the ground as possible. This will ease the
element installation and minimize orientation of.
the elements during the boom support assembly.
When the element is aligned, securely tighten the
eight 1/4"-20 x 3/4" bolts and the anchor bolt.
3-9
Attach the other elements to the boom by repeating
the preceding paragraph. It’s easier to keep the
antenna balanced if you install elements on alter-
nate sides of the boom, working out toward the ends
of the boom. For example, install the 17DE next,
then 12DE, then 20DE, and so on. Remember to
align each element in the horizontal plane (you can
get the first element aligned and then compare the
other elements to the first). Securely tighten the
eight 1/4"-20 x 3/4" bolts on each element and the
anchor bolt (or two anchor bolts on the 20R, 17R,
20DE, FIODE, 15D, 20D, and 17D) on each ele-
ment. After all elements are installed and aligned,
check that the element-to-boom brackets are still
spaced on the boom according to Figure 2.
Phasing Tube Assembly
Select the two (2) 3/4" x 52 1/2" phasing tubes
(Item No. 18), two (2) 3/4" x 45 1/2" phasing tubes
(Item No. 17), two (2) 7/8" x 2" splice tubes (Item
No. 12), the pigtail wire assemblies, support clamps
and insulators, and hardware as shown in Figure 9.
Assemble the tubes together as shown, using four
(4) 10-24 x 1 1/4" hex head screws, #10 internal-
tooth lockwashers, #10 split lockwashers, and 10-
24 hex nuts (Item Nos. 41, 46,-42, and 44) Install a
6 1/2 " pigtail wire (Item No. 65) on the rear joint .
of each tubing assembly before tightening the
hardware. Install the remaining 6 1/2" pigtail wires
in the front three (3) holes of each tubing assembly
as shown, using #10 hardware. The #10 solder lug
of each wire assembly should be sandwiched be-
tween the split and internal-tooth lockwashers or
between the screw head and the split lockwasher as
shown. This minimizes galvanic corrosion, and
ensures good long-term electrical contact. Install
the four (4) 9 1/2" pigtail wires (Item’ 58) in the
rear two (2) holes of each tubing assembly as
shown, using #10 hardware. Use the same assemb-
ly method as before. Before tightening the
hardware, position the pigtail wires as shown.
NOTE: The pigtail wires must alternate from
crossed to not-crossed, starting at the front of the
phasing tube assembly and progressing toward the
rear. This is the normal configuration of a Log-Pe-
riodic Dipole Array (LPDA). Make sure you follow
the pigtail configurations of Figures 10 and 11.

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20 METER 7
DRIVEN ELEMENT
(20 DE)
17 METER
DRIVEN ELEMENT
(17 DE)
Item
No. Description
17 Phasing Tube, 3/4" x 45 1/2"
36 Bolt, 1/4"-20 x 1 1/4"
38 Nut, hex head, 1/4 x 20
39 Lockwasher, internal, 1/4"
58 Pigtail Wire, 9 1/2"
Figure 10
20 and 17 Meter Pigtail Wire Attachment
Select the five (5) sets of support clamp (Item 63),
bottom support insulator (Item 69), top support
_ insulator (Item 70), 10-24 x 2" screws, #10 internal-
tooth lockwashers, and 10-24 hex nuts as shown in
the detail for figure 9. Assemble these loosely to
the phasing tube assemblies and boom as shown.
If you did not use a temporary mast, rotate the
phasing tube assembly on the boom and install the
top two mast bracket bolts (5/16 - 18x 5") as shown
in Figure 9. Rotate the assembly back into place
and position them so that the closest phasing tube
is 3/4" from the top flange of the mast bracket. You
should be able to insert your fingers between the
phasing tube and mast bracket. Slide the support
clamps along the boom until the front of the phas-
ing tubes is 2 3/4" from the center of the FIODE
bracket. Ensure that both tubes are even and that
the pigtail wire attachment screws are vertical.
Tighten the hardware on all phasing tube support
clamps securely.
Sélect the 1/4" -20 x 1 1/4" screws, lockwashers,
and hex nuts and attach the four 9 1/2" pigtail wires
to the aluminum tubing clamps on 20DE and 17DE
as shown in Figure 10. Tighten: the hardware
securely. Select the 1/4" - 20 x 1" screws, lock-
washers, and hex nuts and attach the eight 6 1/2"
pigtail wires to the aluminum tubing clamps on
ISDE, 12DE, FIODE, and RIODE as shown in
Figure 11. Also attach the two 5 3/4" pigtail wires
to the clamps on FIODE. These will attach to the
balun. Tighten all hardware securely.
Attach the BN-4000 balun to the boom, as in Figure
11, using the U-bolt and #10 - 24 nuts. Attach the
two 5 3/4" pigtail wires to the balun using 1/4" - 20
x 3/8" screws and lockwashers. Tighten all
hardware securely.

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10, 12, 15 Meter Pigtail Wires and Balun Attachment