Hy-Gain 483 Installation instructions

ORDER NO.
483
,,-.,
'- _«()BILE STATION BI-L1NEAR AMPLIFIER 12 VDC
INST LL TION
OPER TION INSTRUCTIONS
HY-GAIN ELECTQONICS CORPORATION
Rural Route 3 • Lincoln. NElbraska 68505
This Bi-LinearAmplifier is precision built, compact amplifier of
advanced design. It utilizes an integrated circuit, two tubes, four
transistors and four diodes and a grounded grid, tuned plate
circuit for amplication for AM, FM, CW, and-SSB si~nals .
The Bi-Linear Ampl ifier will operate over the frequency range
25-54 MHz. However, it is F.C.C. Type Accepted under Parts 89,
91, and 93 over the frequency range 25-40 MHz.
Operation of this equipment requires a FCC license. Failure to
comply is punishable by penalties set forth in the Rules and
Regulations of the FCC. A copy of these Rules is available from
the U.S. Government Printing Office and should be in the
possessionof the operator.
The 483 Bi-LinearAmplifier complies with FCC Regulation when
shipped from the factory, and must be used with a transceiver
which is FCC Type Accepted under Parts 89, 91, and 93 for the
system to bevalid.
.,....-."
A special feature of the Amplifier is the automatic antenna
change over relay which operates without special external
connections making it perfect for operation with low power
transceivers not having external amplifier control circuits.
Another feature is that this unit amplifies the received signal,uti-
lizing an integrated circuit amplifier.
Variable plate tune and load capacitors offer impedance matching
for maximum output to varying antenna loads in the 40-70 ohm
range.
The Bi-Li near Amplifier has been designed and constructed to
suppress radiation that may cause television interference. TVI
problem has been given full consideration in design and layout of
the chassis.
There are, however, some types of TVI that cannot be prevented
within the amplifier. This is particularly true in weak signal areas.
In such cases,a good commercial low passfilter is recommended.
~e.ight 41/8"
,dth 7 1/8"
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 103/8"
NetWeight 5 Lbs.
ShippingWeight SLbs.
Construction .•................ Lig 'ttweightaluminumchassis
with rugged steel case
Power Requirement _ +12-14V DC
15 Amp
FreRuency Range 25-54 MHz*
Types of Emission AM, FM. CW, SSB.DSB
Power Output (Slightly lessat 50 MHZ) 220 Watts
PEP,SSB,or DSB
80 Watts (with 3.5 watts drive)
Amplification of Received Signal 40 db
Drive Requirement to Trigger An>enna Relay ,1Watt
Max Drive (unmodulated carrier and FM}. _, 15 Watts
(amplitude modulated carrier) 3.5 watts
(amplitude modulated peak) .. , .. 14 watts PEP
Harmonic Supression suppressedmore than 60db
Input Impedance (unbalanced) 50 Ohms
nominal, lessthan 2: 1 VSWR25-54 MHz*
Output Impedance (unbalanced) 50 Ohms
nominal, Adjustable 40-70 ohms, nonreactive
Antenna Switching Automatic provided by
RF sensingnetwork
Tube and Diode Complement _ 2 Tubes
4 Transistors, 10 Diodes
1 Integrated Circuit
Cable Connector Data _ Input and Output
require MIL PL-259
*F.C.C. Type Accepted for frequency range 25-40 MHz only.
ASSEMBLY AND INSTAllATION:
() Carefully remove the amplifier from the packing car-
ton. Examine it closely for signs of shipping damage.
Check to insure tubes are seated in the sockets. Check
the plate caps on the tubes. Inspect for any signs of in-
ternal damage.
The unit is made to operate on negative ground systems
only. Do not attempt to operate your amplifier until you have
read the manual and properly installed t he unit.
() The location is not critical but consideration must be given to
adequate ventilation.
IMPORTANT
Allow at least 4" of clearance on all sides of the cabinet
for good air circulation.
() The primary pOwer connection on the amplifier is the +12V
DC terminal on the rear panel.
() The fuse holder is provided on the hookup cable .with a.2Q
amp fqse. Do not use a larger capacity fqse or amplifier,
transfqrmer, and power supplywilinotbe protected.
(). The unit. will not operCite without grounding. It i$
recommended thClt a No. 12 or heavier wire be rqnfrom the

ground terminal on the amplifier to the ground terminal on the
battery.
() This model amplifier will work with the common antenna
systems designed for the 25-54 MHz*range provided the antenna
has a resistive input impedance between 40-70 Ohms. The SWR
should be kept to a minimum of 2:1 or less.
() The output connector provided is an So-239. For connection
of your antenna, you will need a PL 259 plug.
ON-OFF Switch Controls +12V DC power to amplifier
AM·FM & SSB Switch Adjust delay constant of automatic
antenna relay
XMT -Standby Switch .... Activ,Jfes the automatic antenna relay
circuit, also supplies power to the receive
amplifier circu it.
Receive Amplifier ON-Off Switch .. Activiltes the integratcr
circuit receive amplifiel·.
NOTE: Receive amplifier will only operilte when th'eXMT-Standby
switch is ill the XMT position anelthe REC AMP switch is ON.
RED Indicator Light Visual indication of applied
+12V DC power
Output Meter. . . . . . . . . . . . .. . .. Visual ineliciltion of relative
RF power output.
Tune Control Adjusts reson,mt frequency of amplifier.
Load Control Adjusts coupling of output circuit to antenna.
The amplifier Cdn be mounted either uncler the dilsh using the
bracket provided or ill the trunk asdesired.
When the unit is clash lTlountted, i.I r~lseciprimary connection to
the battery or fuse block must lw provided.
If trunk mOLinted, a remote switch must be uSI~d,ami can be
purchased through your local deJler. MOUllt the remote switch on
th,; dash where it iscOllVeniellt. Remote switch 1l10Llntillgmust be
grounded to the vehicle chilssis or thl~ indicator light will be
Inoperative.
R('I1~':;l1hl~1 tlH: tront panel dnl rl)lllo e Oiwilclws ,lie series
conll"cWd. Tlll~ aillplifil~r Will not OPI~I'dt(' if l~i h('r switch
is III till' OFF position.
Before he llf]nln l InstallatIOn, It IS recOIl:IlIt'ncler that the
pas Iflve lenr of tile hattery be dlsconm.'U,'d to f lp\'l'nt de
eldental.wuunds and p/petrleal system dall1a.1je.
Conlwct the fuse hookup cabl,) to the positive tl'rmin,il of the
battery or fLiseblock. The othl~r Iedd should 1'L1numier the seats
and carpets in the protec l;d locdtion to the dillplifil'r primary
power connection. A length of RG 58.U should ill' installed
between the transceiver dnd amplifier. COlll)l~Ctd 110lllill d l 50 ohm
antenna to the amplifier.
Connect the ground stud on the dmplifier to t w IWlli.ltivehattery
connection.
Before applying power, make one final check Oil ,dl wil'ing ,1Ild
conTlections.
WARNING
WHENTHE AMPLIFIER IS USED IN THE BUSI NESS BAND, AD-
JUSTMENTS MUST BE MADE ONLY BY A FCC LICENSED
TECHNICIAN.
The 483 Bi-Linear Amplifier is factory adjusted for the rang('..-..,
25-32 MHz. Operation over the range 32-40 MHz requires,
change in the number of turns in L1 (RF Tank Coil). A shorting
tap is placed on the end of the coil, from the left-hand side as
viewed from the front panel (seefig. 2) to the first turn, counting
from the Ieft side.
This Amplifier must be used with a transmitter or transceiver
capable of at least one watt output.
Remove Controls cover for tuning and loading.
Install knobs supplied in separate parts pack. Fully mesh
both the Tune and Load Capacitors, then install the small
knob on the Tune and the big knob on the Load capacitor
shaft, insuring that the marking on the knobs are horizontal
and pointing to the left when viewed from the front.
WARNING
Before applying any RF power to the Linear, pretune the tune
control to the desired frequency at which you wish to operate.
Seeillustration on this page.
For example, if your desired operating frequency is 31 MHz then
set ••he tune knob at midpoint between 29 and 33 asshown.
For operation on the 50 to 54 MHz band set tune control to
the 29 MHz position as shown above. Then refer to the 50
to 54 IV/Hz Operation.
First place the function switch in the AM-FM position. Set the
tune contro I in accordance with the warn ing on th is page of the
mdnual. The load control shouId be positioned so that the
capabtor is fully meshed,
Now push the ON-OFF switch to ON. The red visual indicator
light will light.
After warm·up, push the XMT-Standby to XMT. This
energize the automatic antenna relay control circuitry,
provide power for the integrated circuit receive amplifier.
will
and
Apply drive power by keying the exciter (transceive"
microphone and quickly adjust the tune control for maximum
reading on the output meter. Remove drive power after
adjustment.

SCHEMATIC LEGEND FOR PRODUCT 483
Symbol Description Part No.
C1 150 uuf 1KV Disc Ceramic 727980
C2, 4, 5,8,
20, 28 2200 uuf 1KV Disc Ceramic 721161
C9 56 uuf 1KV Disc Ceramic 725711
C13 20 uuf 1KV Disc Ceramic 725717
C10,11 10 uf 500 WVDC Electrolytic 721109
C26 100 uf 25 WVDC Electrolytic 725698
C23, 24 6800 uuf 1KV Disc Ceramic 721160
C14 1000 uuf 1KV Disc Ceramic 721158
C19,15 3300 uuf 3KV Disc Ceramic 721159
C16
.01 uf 1KV Disc Ceramic 721178
C17
10.5-313.9 uuf Air Variable 721123
C18 3.2-50 uuf Air Variable 721157
C21,25 10 uf 25-35 VDC Electrolytic 721121
C22 500 uf 15 WVDC Electrolytic 721130
C27 100 uuf 1KV Silver Mica 725993
D1,2,3,4 1N5054 Diode 765713
D5, 6,9,10 1N270 Diode 765722
D7 1N753 Zenner Diode 765721
F1 SFE 20 Amp Fuse 711110
K1,2 4PDT 12 VDC Relay 730006
L1 Tank Coil 271490
L2,3 .56 uh Coil 725679
N1 #53 14V Bulb 715665
/-- .... ,
Ql MPS 6516 Transistor 761115
Q2 2N696 Transistor 761114
C30-32 180 pF SM 720013
Q3,4 2N1522 Transistor 761105
R1, 2270 K-,,-l W Resistor 721162
R3 510 -,,-1/4 W Resistor 725727
R4 1200 -,,-1/4 W Resistor 725728
R5 330-,,-1/2 W Resistor 721167
R6
270 -1\,.1/4 W Resistor 721112
R7,13 33-1\,.1/4
W Resistor 721103
R8
50-1\,. lOW Wire Wound Resistor 725662
R9 3
-I\,. 8W Wire Wound Resistor 725663
RFC3 Ohmite Z -
144 Choke 728025
RFC2 47 uh Choke 725710
C7 50 PF 1KV Disc Ceramic 725718
RFC4 Ohmite Z - 28 721124
Sl, 4 DPST Switch 701106
S2,3 SPST Switch 701147
T1 12V to 800V Toroid 731163
V1,2 6JU6 Vacuum Tube 761166
IC 1 MC 1550/G IC Amplifier 765724
C3 100 Pf 1KV Disc 721016
D8 1N34 Di ode 765668
RFC1 100 uh Choke 721155
RIO
L 2K 1/4 W Resistor 725728
R11 5K 1/2 W Resistor 721767
,~
R12
4.7K 1/2 W Resistor 725650
M1 Meter Relative Power 795680
C29 100 uf 25V DC Capacitor 725678
L4,5 Filter Coil 720003
C31 240 PF SM 720004

r---'U--ci9,;QO';- --l
I
I
R2 +CIl
Nt 210K T- 101,1"
.weJ LAMP IW rf7
--------
RIO I
WI Cisl
XI
I I
LPOWER~ETE~ J
I
ilOOpf I: pf I
ga,.... ~ sIUh ~?l I
010 I K2 II
C4 C21 09 INO I COIL U +C2e
;JiF;;;2200PfINV I :tCf i'OOUfd
I I 0rOPF
I 54
I REC.PREAMP ::: .J
-------------

Do not apply drive power for more than five seconds without
,-.., adjusting the tune control or damage to the tubes can result.
Reapply drive power and advance (clockwise) the load control,
note the increase in reading of the output meter. Adjust the load
control for maximum reading of the output meter. Now go back
to the tune control and reset for maximum output. Remove drive
power.
Readjustment of the tuning and loading controls several
times will produce maximum output.
To provide for the extra power contained in the AM signal
modulation it is necessary to "overcouple" the output circuit.
This is necessaryto insure an undistorted output with a minimum
of adjacent channel "bleed ing" (spatter).
Reapply drive power and advance the load control until the
output meter drops perceptably, (about 15 per cent more
rotation). Readjust the tune control for maximum output. The
output circuit is now "overcoupled".
If a relative power output indicator is available (SWR bridge on
forward, etc.) the output signal can be quickly checked to insure
upward modulation. If the meter does not "flick" upward on
voice peaks, the load control is improperly set (or the exciter is
not capable of 100 per cent modulation or may have "downward
modulation"). Also seen on output meter.
Automatic antenna change over and ampl ifier operation is
provided for by a special transistorized input sensing circu it.
Should you desire to hold the amplifier in a "ready" condition,
but not use it until needed, simply place the XMT·Standby in the
standby position. The sensing circuit will be disabled and the
antenna connected to the exciter (transceiver) at all times.
IMPORTANT
With the XMT-Standby switch in the standby position, the
REC AMP switch should be in the OFF position. This will
prevent the receive amplifier loading the transceiver output.
The ampl ifier is tu ned for FM service in a manner identical to AM
except the load and tune controls are set for maximum output.
Place the fu nction switch in the SSB position. This will connect a
delay circuit to the automatic relay control and extend the
"drop·out" approximately one second. This will prevent relay
"chatter ing" and erratic operation.
If the exciter (transceiver) is capable of carrier output equal to
the peak power of the voice SSB or DSB signal, simply adjust the
tune and load controls for maximum deflection of the output
met~r while applying carrier.
If the exciter (transceiver) ca'1110tsupply a carrier equal to the
peak power of the voice SSB or DSB signal then the tune and
load controls must be set for maximum output while modulating.
In this case, a modulation ellVelope indicator (monitor scope) is
the most reliable method for adjustment of the amplifier.
Place the function switch in the SSB position, apply drive power,
and adjust the tune and load controls for maximum output.
The delay circuit for SSB prevents "drop·out" of the automatic
antenna relay between ch<Jracters.
Remove knobs and replace controls cover before putting the
Ampl ifier into business radio service
For operation on the six meter amateur band it is necessary to
short out three turns from the left hand side asviewed from the
front panel of the Pi·network output coil, L1. The 100pf silver
mica capacitor acrossC17 load capacitor, must be removed.
The low pass fi Iter on the output must be shorted out. Thi s
can be done by soldering a wire from the input to the output
and removing the three si Iver mica capacitors (180pF and
240pF) from the smaII circu i t board connected to the output
socket.
REMOVE FOR OIl MEttR
AMATElJR BAND
OPERATION
IOOpf CAPACITOR
ACCROSS C-17

A portion of the incoming circuit is coupled to the base of 01
sensing transistor. This causes 01 to conduct and change the bias
on 02, relay transistor. 02 conducts heavily and closes n,lay K 1.
Relay K1 connects the input signal to the cathodes of V1 and V2,
applies plate voltage to V1 and V2, and connects the output
circuit to the antenna.
C18 is the Pi-net tune caracitor and sets the operating frequency
of the ampl ifier.
C17 is the Pi-net load capacitor and controls the coupling to the
antenna.
For SSB operation, C22 is added to the relay transistor circu it to
extend the" dror au t" time.
An integrated circuit amrlifier increases the level of the incoming
signals from the antenna before it is arrlied to the transceiver.
This amplifier is powered by the XMT-Standby switch and the
REC AMP switch. With the XMT·Standby switch in the XMT
position the receive amplifier can be switched ON or OFF as
required. With the switch in the standby position, the receive
amplifier is disabled and the receive amplifier switch should be in
the OFF position.
The manufacturer guarantees to remedy for a period of 90 days
from the date of purchase any defect in material or workmanship
existing in this model at no cost to the owner, exclusive of
shipping charges, provided:
~ ANTENNA
(OOTPUT)
1. The defect is not the
incorrect wiring not our
contrary to instructions.
result of misuse, neglect, accident,
own, improper installation or use
2. The unit serial number has been registered by the origir' •...
purchaser.
3. The unit or part that appears defective is delivered prepaid to
the manufacturer or authorized service center that we may
designate.
4. Examination discloses, in our judgement, a defective part or
workmanship.
This warranty does not extend to any units which have been
repaired or altered outside of our factory nor to cases where the
serial number has been removed. defaced or changed.
All labor, tubes, semi-conductors and other parts are included in
this warranty. Any transportation costs, or similar charges, that
may be incurred are not included. The manufacturer's sole
liability is the repair at no charge of any defect for the period
stated.
This written warranty is in lieu of all warranties expressed or
implied and no representative or person is authorized to assume
for us any other liability in connection with the sale of our
products.
The manufacturer reserves the right to make any changes deemed
necessary or desirable to improve the product without incurri'~
obligation to make (or furnish parts for) like changes in un.
previously manufactured or sold.
All Warranties are void one year after the last model has been
manufactured.
IMPORTANT
FUSE SYSTEM NEAR
BATTERY