Telex Communications Hy-Gain 205B-S User manual

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0
TELEX
COMMUNICATIONS,
INC.
9600
ALDRICH
AVE
SO
. MINNEAPOLIS,
MN
55420
LIS A \
INSTRUCTION
MANUAL
ORDER NO. 205S-1
1
Model 205B~S
5-Element, .2.
-Meter
Beam
PN
801313-2
General
Descriplion
SpecificaUons
SWR and Feedllne
This antenna is a 5 element. 2 meter
beam
optimum
spaced
on a
75
11
boom. It
features high forward gain and an excellent front-to~back ra o. The antenna is
end mounted giving it the advantage of no mast decoupling and a broad
frequency
response. This antenna
now
uses stainless steel hardware in most
locations
except
forthe U-bolts. Also, this antenna
now
features a
NEW
boom-to-
mast
bracket
tha1
fits up to a mast diameter
of
2 1
/1s
inches
.
Mechanical
Boom Length
.....
.
..•..................................
75
/i
(1905
mm)
Longest Element
•.•...
. •
..............................
39%" (1006
mm)
Net We'
ght................................
... . . . . . . . •. . . 2.9 lbs.
,(1.3
kg)
Turning Radius
(Max.)
....................................
73
11
(1854 mm)
Wind Survival . . . . . . . . . . . . . • . .
..•........•.•.......
80
mph (129 kmph)
Mast Diameter
.................•..
1
%"
to 2
1/1
,6"
O.D.
(41
i mm to 52 mm)
Boom
Diameter
..•.....
..............................
1
¼" O.D. (32
mm)
Wind Area
..............................
0.585 sq.
ft.
(.054 m2) (horizontal)
0.740 sq.
ft.
(.0688
m2)
(vertical)
Electrical
Gain
(Average).
.. . . . . • . •. . . . . . . . . . . . .
.......•...•....
11.3 dBi (9 dBd)
Front-
to-Back
Ratio . • . •
.•.......................................
20 dB
Maximum
SWR . . . . . . .
..
. .
.........................................
2:1
Band Width
...........•.........................................
4 MHz
Maximum
Power
....
.
...............
250 Watts cont'nuous, 500 Watts
P.E.P
.
Impedance
. . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . .
•.•...
50
ohms
(with balun)•
Half-Power
Beam
Width
.......•....•.•.•..
.
......
60°
(vertical polar"zation),
45
°
(horizontal poradzation),
Stacking Distance
..............................
82" (2083 mm) m'nimum
The
205S-1 antenna
has
an input
impedance
of 200
ohms
.
The
suppllied balun
matches
the
·n
put
to
50
ohms
. It 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 informatlon on
constructing a matching service.
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I 7~ ,. I
. ~
14 . 76 cm)
Tuning
2
03
02
A0 -0 20~· C ·OOI
7 8 9
\ \ \
Item
No . De sc ription
2 Tube. Driven Element, aluminum, 1 /, 5" x 17 ¼"
6 Tube. R1, aluminum, 1 /,5" x 39 ¾"
7 Tube,
D1 , aluminum. '/,6" x 361/a"
8 Tube, D2. alum,num, '!t6" x 35+,·
9 Tube. D3. aluminum. 1
/15" x 35 ¼i"
BETA ROD \
DI
DE
RI
- --- 2011. II -- -• ""' I•
151.43cm)
_ 15 112·· _
139 . 37 cm)
9 1 1.· J3 .,. ·L-
123 . 49 cm) (8 . 25 cm) _
1s•1• " _
( 41.59 cm)
-~8
1
/2"
(21.59cm)
75" BOOM
Figure 1
Overall View and Boom Detail
NOTE : The Driven and Parasi tic Elements are adjusted independently in the
fallowing manner:
Parasitic Elements: This antenna is pretuned for maximum gainandbest
radiation pattern at 146 MHz. This setting will give optimum performance
over the entire 144-148 MHz band.
If you wishto optimizetheantennafor afrequency higherthan 1
46 MHz,cut
¼" off of the total element lengths for each MHz higher than 146.
Driven Element: SWR can be lowered to less than 1 .2: 1 at a desired
frequency by
care fu lly trimming the dr iven element. Keep the element
symmetrical by cutting the same amount from each side. Typical SWR
curves are shown in Figure 2A, and a cutting cha
rt is shown in Figure 28.
Each installation is slightly different,so cut the driven element forthelower
SWR at your particular location. Measure the SWR as close
to the antenna
as you
can for accu rate result s.
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,,. """' -------
1"46 M Hr ---
t4t WH1 -• - · -
A O•OtO ~ • IL-00:)
Figure 2A
"' QJ
r::.
"
s
s
<ii
r::.
c
"'
E
.,
oi
C:
QJ
~
i3
0
.c
0,
C:
~
-
I-
t--.
17
-
~~
16
14 4
AJ A 0 205 A- 006
-
1--
I- I-
..._
1--.
~
,_
'-
'- 1-1-
t--._ 1-- -
145 146
147 148
Frequency in MHz
Figure 2B
VSWR for Both Vertical
and Horizontal Polarization Driven Element Cutting Chart
Stacking This antenna can be easily stacked for approximately 3 dB
mo re gain each time
the number of yagi is doubled.Refer to Figure 3 for stacking and phasing harness
cutting information.
The two phasing l in es co ming from the two antennas to the" T" connectorcan be
any odd multiple of ¼ wavelength in the 75
ohm transmission line.See Figure4.
NOTE: When phasing tw o antennas. the Driven Element halves that are
connected directly to the phasing lines should be on the same s id e ofthe array.
AO 020~ c-ooi
Figure 3
Stacking
Two (2) Antennas
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Installation
Step-by-Step
Assembly
PLUG
END
The feedline impedance Is for 50 ohms (RG-213 /U).For detailedintormat1on on
stacking more than
two yagIs, please cons ult a current Amateur Handbook.
NOTE: The boom-to-mast bra cket may be placed be tw een the Driven Element
and
D1 when stacking two antennas.
A0•0203 -A -0 06
- 67
11
-
RG-1I/U OR ANY 75 -0 HM COAX
5
/4 >.. = 67"
3
/4 >.. =40"
Figure 4
7
/4 A = 93
1/2
II
9
/4 ;,. = 120
11
Phasing Line Cutting Dimensions
ANTENNA
END
This antenna fits a 2" mast. A 2" O.D. pipe is recommended for a sturdy mast.
Mount the antenna in the clear. Surrounding objects-particularly pow er lines
and other
objects of considerable mass or l ength-are detrimental to the
performance of the antenna.
WARNING
Do not allowany part ofthe antenna totouchpower
lines. This couldcausesevere burns
or fatal injurie s.
When mounting two dissimil ar antennas on the same mast, be sure they are
separated
by at l eas t six feet -eight to ten feet is even better.
The
an tenna can be mounted either vertically or horizontally for FM or SSB /C W
respectively. Circular polarization
can be obtained by using two yagis. For
information about
which polarization is best consult local Amateurs who use the
frequencies you desire.
Remove
the parts from the carton and check them against the parts list and the
illustrations.
Select the
boom-to-mast backup plate (Item No . 5), the boom-to-mast clamp
(Item N
o. 4) and thetour( 4) ¼ "-20 x ¾" bo lts, lockwashers and nuts (Item Nos . 16 ,
26 & 23).
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AO - 0205-8 - 009
,.c-- SEE DETAIL A
, SEF OE TAil B
Item
No. De scr iption
Tube , Boom, aluminum, 1 ¼" x 75"
4 Clamp, Boom-to-Mast
5 Backup Plate, Boom- to -Mast
13 Cap lug, 1 ¼"
15 U-Bolt, 0/,s"-18 x 3 %"
It em
No.
16
21
23
24
26
Description
Bolt, hex head . ¼"- 20 x 1 1,'
Nut , hex , '•/r5"-18
Nut , hex , '/. ,"-20
Lockwasher, split, '/,5"
Lockwasher, in ternal, ¼"
Figure 5
Boom-to-Mast Clamp Assembly
I
I
II
11
3/
11
EL EMENT
U/ 16
•
I I
Figure 5 - DETAIL A
Parasitic Element Attachment
-5-
A0 - 0205 - A-007
It em
No. Descrip tio n
1 Tube , Boom, aluminum, , ,.,,., x 75"
18 Eyebolt.
',J,5", II 10- 24 X 1'I."
22 Nut , hex , 11 10-24
25 Lockwasher. internal. 1110
27 Half-Washer, alum i num

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11
19
17
\
®-===,._
\
~
I
10
A0 - 0205 - B-006
~14
~
DRIVEN ELE MENT
3
/
12 CENTER
/
CONDUCTOR
I I ii~~
•- @<o(l
@ @
-BRAID
@- - -{, -
/
25 22
TAPE (3 PLACES)--~
Item Item
No . Description No . Description
3 Bela Rod, 3'' 17 Bolt, hex head, 1110 -24 x2 1/;,''
10 Balun Assembly 19 Boll, hex head, #10-24 x 1 Y/'
11 lnsulal or (Driven Element-to-Boom) 22 Nut. hex. #10-24
12
Bela Clip 25 Lockwasher. internal, II10
14 Caplug, '/ 11 ,"
Figure 5 - DETAIL B
Driven Eleme nt , Beta Match and Balun Assembly
Pl ace the boom-to-mast clamp on th e boom as shown in Figure 5. Use th e 1 /4 "-20
x '¾" bolts in th e outs ide holes. Leave the i nside holes for the two U-bolts , wh ic h
wi ll be used later for mounting th e mast. Select ei ther the vertical or horizontal
mounting position. Adjust th e boom accordingly before tightening the bolts
securely.
Selec t the
3/
16" x 39%" R1 tube ( Item No . 6) , use pencil to place a mark at the
ce nt er of the rod (19
13
/15" from eith er e nd) and p lace tw o mo re marks %" from
eac h side of the center ma rk.
Place a # 10 - 24 x 1 ½" eyebol t (Item No . 18) in to the R1 slot as shown in Figure 5,
Detail A. Sl
ide the R1 through the hol es and the e yeball until the outer two marks
on the R1 are visible on eac h side oft he boom . Slip on an aluminum ha lf wash er,a
lockwasher and a #10 nut (Item Nos . 27 , 25 & 22 ). Tighten it just enough to hold
the rod securely. Do not over tighten.
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vz.
t;"/ It
Select the element-to-boom insulator (Item No. 11 ), two sections of the Driven
El
emen t (7 /15
11
x 17 ¼") tubing (Item No. 2) and beta rod (Item No. 3).
NOTE : If 50 ohm coaxial cable is used to feed the antenna. select the supplied
balun at this time.
Use the#10-24 x2 ½" bolt(Item No . 17 ) to fastenthe el ement -to-boom insulatorto
the boom. Refer to Figure
5. Detail B.
Use the two (2) #10-24 x 1¼" bolts (Item No. 19) to assemble the Driven El ement
as shown in Figure
5, Detail B. Pay particular attention to the co nnections of the
beta rod, balun and teedli
ne.
Waterproof the connect ion with neoprene, Krylon® or some similar substance.
Install
cap lugs on the ends of the boom and the Driven Element.
Use the #10 x %" screw (Item No. 20) to fasten the beta rod shorting clip over the
beta rod, as shown in Figure 5, Detail B.
Select the following rods: 01 (36
1/s" long)(ItemNo.7), 02 (35 ¾" long)(ItemNo.8)
and
03 (35%" long)(Item N o. 9). Mark the center point on each rod,then maketwo
more
ma rks%" oneitherside of thecent er mark. Securetheelementstothe boom
as shown in Figure 1 and Figure 5, Detail
A. Be surethey are oriented as shown.
Slip the two (2)
U-bolts into the boom-to-mas t bracket and fasten it to the mast
secure ly. Tape the coax feedline to the boom and to the mast. Besuretoinsulate
any conn
ec tions from the boom or the mast. This com pl etes your installation.
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Krylon® is a registered trademark of Borden Chemical Co .
-7-

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PARTS LIST
Item
No . Part
No . Description
Qty
1 170386
Tub e, Boom, aluminum, 1 ¼" x 75" . ................ . .... . .. . . . ....... 1
2 175157
Tube . Dr iven Element, aluminum, 1 /,5" x 17 ¼" . ............... . . . ... . .. 2
3 160040 Beta Rod. 3"
........... . .... . .. ... . . ........................ . ..... 1
4 385142-1 Clamp,
Boom - 10 -Mast .......... .. .......... . .. . . . .. . ...... . .... ... . 1
5 385144-1
Backup Plate, Boom-to-Masi ................... . .... . . . .. . . . ........ 1
6 160036
Tub e, R1 , aluminum, 3
/,
5" x 39%" ................. . .. ... .. . ....... . .. 1
7 160016
Tub e, 01, aluminum, 3 /16" x 36 1/e" ................................ . ... 1
8 160019 Tube,
02, aluminum, 3 /15" x 35¾" .. ........ .... . .......... . .......... 1
9 160021 Tube,
03 , aluminum, 3 /,5" x 35¾" ................................ . ... 1
10 871704 Balun Assembly
.... ... .. . . .... .................. . ..... . . . .... . .... 1
11
465420 Insulator (Driven Element-to-
Boom ) .. . . ..... ... . . .. .................. 1
872073-1 Parts Pack 205S-1, Stainless
St eel ......... .. .. . .... . .... .. ..... . ... 1
12 163266 Beta C
li p ......... .. .. . ...... . .......................... . ....... 1
13 455630
Cap lug, 1 ¼" ....... . ............................................. 2
14
475639 Caplug, 7
/15" .... . ..... . ...•...•..•.......... . .. . ..............•.• 2
15 540067 U-Bolt, 0
/16" -18 x 3 %" . ......... . ... . .. ... .. . .... . . ...... .......... 2
16 505266 Bolt, hex head, ¼"-
20 x ¾" . . . .. .......................... ...... .. 4
17 500164 Bolt, hex head,
1110-24 x 2 ½" .............................. . ...... 1
18
540065 Eyebolt, 5/,
s", 1110-24 x 1 ½" ....................................... 4
19
500159 Boll, hex head,
1110 -24 x 1½" .................................... . 2
20 510670
Screw , pan head, Type A, 1110 x 3/s'' .••..... ... .. ........ .. . • .• . .. • . 1
21
555747 Nut, hex, 5
/1s" -18 ..... . ........................ . . .... . . .. . . . .. .... 4
22 554071 Nut, hex, #10-24
................................ . .. ... .. ... ..... 11
23 554099 Nut, hex, 1
/4'' -20 ............... . .... ...... . . ...................... 4
24 564792 Lockwasher, split, 5
/1s" ............. . . ...... .............. . ...... .. 4
25 565697 Lockwasher, internal,
II 10. . ... .. ........... . ....... . ........ .... . 12
26 562961 Lockwasher, internal,
¼" ............. . . . .. ............ ............ 5
27 170376 Half Washer, aluminum
.. .... ... ......... . .. .... ... ............... 4
Converting English Measurements to Metric
Use this scale to identify lengths of bolts, diameters of tubes, etc .. The English
inch
(1 ") and foot (1 ') can be converted to centimeters in this way.
PAINTED IN U. S.A.
Copyri ght"' 1984 by Tel ex
TELEX COMMUNI CAT IONS, INC
All rights ,eserved.
25 SEPT, 198•
1 inch (1") = 2.54 cm
1 foot (1 ') =30.48 cm
Example:
42" x 2.54 = 106.7
cm
-8-
.....