Hy-Gain 482 Installation instructions

ORDER NO.
482
~in
,{J,I} ~
~~/~cc,_/ . u·,- ,
•.• ASE STATION BI-L1NEA R AMPLIFIER 115 VAC
INSTALLATION &
OPERATION INSTRUCTIONS
HY-GAIN ELECTRONICS CORPORATION
Rural Route3 Lincoln, Nebraska 68505
The Bi-LinearAmplifier is a precision built, compact amplifier of
advanced design. It util izes an integrated circu it, two tubes, two
transistors and three diodes and a grounded grid, tuned plate
circuit for amplification of AM, FM, CW/and SSB signals
The Bi-Li near 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 penalities 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 482 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
~stem to bevalid.
A specia' 'eature of the Ampl ifier 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 circu its.
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 Ampl ifier 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 TV I 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.
MECHANICAL SPECIFICATIONS:
'~'ight 4 1/8
~'~vlfidth 7 1/8
Depth 10 3/8
Net Weight 11 Lbs.
Shipping Weight 12 Lbs.
Construction Lightweight aluminum chassis
with rugged steel case
Power Requirement 115 V AC
3Amp
Frequency Range 25-54 MHz*
Types of Emmission AM, FM, CW, SSB, DSB
Power Output (Slightly lessat 50 MHz) 220 Watts PEP, SSB,
or DSB
80 Watts CW (with 3.5 watts drive)
Amplification of Received Signal , 20 db
Drive Requirement to Trigger AntEmna Relay 1Watt
Max Drive (unmodulated carrier and FM) : 15Watts
(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 MHi*
Output Impedance(unbalanced) 50 Ohms
nominal, Adjustable 40-70 ohms, nonreactive
Antenna Switching .: Automatic provided by RF
sensing network
Tube and Diode Complement 2 Tubes
2 Transistors, 3 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
() Carefully remove the amplifier from the packing carton. Ex-
amine 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 internal damage.
Do not attempt to operate your amplifier until you have read
the manual and properly installed the 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 a standard
115V AC line plug.
() The fuse holder is provided on the rear panel with a 3 amp, 3
AG fuse. Do not use a larger capacity fuse or amplifier,
transformer, and power supply will not be protected.
() The unit should be operated with a good ground. Water pipes
and other house fixtures are not recommended.
() The Bi-Linear 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 120V AC power to amplifier.
AM-FM & SSBSwitch Adjust delay constant of automatic
antenna relay.
XMT-Standby Switch Activates the automatic antenna
relay circu it,
also supplies power to the receive amplifier circuit.
Receiver Amplifier ON-OFF Switch .... Activates the integrated
circuit receive amplifier.
r\lOTE: Receive amplifier will only operate when
the XMT-Standby switch is in the XMT position.
RED Indicator Light Visual indication of
applied 115 V AC power.
Output Meter Visual indication of
relative RF power autput.
Tune Control Adjusts resonant frequency
of amplifier.
Load Control Adjusts coupling of
output circu it to.antenna.
WHEN THE AMPLIFIER IS USED IN THE BUSI NESSBAND, AD-
JUSTMENTS MUST BE MADE ONLY BY A FCC LICENSED
TECHNICIAN.
The 482 Bi-LinearAmplifier is factory adjusted for the range
25-32 MHz. Operation over the range 32-40 MHz requires a
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 left side.
This Amplifier must be used with a transmitter or transceiver
capable of at least one watt output.
Remove Controls cover for tuning and loadinq.
Install knobs supplied in separate parts pack. Fully mesh
both the Tune and Load Capacitors, then insta II the smaII
knob on the Tune and the big knoll on the Load capacitor
shaft, insuring that the marking on the knobs are horizontal
and pointing to the left when viewed from the front.
First place the function switch in the AM:FM position. Set the
tune control in accordance with the warning on page 3 of the
manual. The load control should be positioned so that the
capacitor 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 will
energize the automatic antenna relay control circuitry, and
provide power for the integrated circu it receive amplifier.
Apply drive power by keying the exciter (transceiver)
microphone and quickly adjust the tune control for maximum
deflection on the output meter. Remove drive power after
adjustment.
NOTE
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 deflection of the output meter. Adjust the
load control 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 amplifier operation is
provided for by a special transistorized input sensing circ~
Should you desire to hold the amplifier in a ready condit'
but not use it until needed, simply place the XMT-Standby in tM
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 ampIifier loadi ng the transceiver output.
The amplifier istuned for FM service in a manner identical to AM
except the load and tune controls are set for maximum output.
Place the function switch in the SSB position. This will connect a
delay circu it to the automatic relay control and extend the
drop-out approximately one second. This will prevent relay
chattering and erratic operation.
If the exciter (transceiver) is capable of carrier output equal to
the peak power of the voice SSBor DSB signal, simply adjust the
tune and load controls for maximum deflection of the output
meter while applying carrier.
If the exciter (transceiver) cannot ~pply a carrier equal t0l \
peak power of the voice SSB or DSB signal then the tune
load controls must be set for maximum output while modulati~:
In this case, a modulation envelope indicator (monitor scope) is
the most reliable method for adjustmel]t of the amplifier.

C2, 29, 30,
8, 28, 20
Cl
C9
C7
C14
C12, 24, 15,
16,23
C19
C4, 5, 13
C27
C21
Cll, 10
C22,26
C25
C17
C18
D1, 2
D3
D5, 6
D7
R1,2
R3
R4, 10
R5
R6
2200 ..••.••.F 1KV Disc Ceramic
150.•...••F 1KV Disc Ceramic
56.••...•.F 1KV Di sc Ceramic
50..•.•uF 1KV Disc Ceramic
20..«.«F 1KV Disc Ceramic
6800MM.F 1KV Disc Ceramic
3300.MMF 3KV Disc Ceramic
1000-K~F 1KV Disc Ceraluic
100...<~F Silver Mica
10...-:F 25-35 WVDC
Electrolytic
40.•.•..F 450V Electrolytic
500.•.•..F 15VDC Electrolytic
• 01. .t FD 1KV Disc Ceramic
10.5 - 313. 9~F Air Variable
3.2 -50 M~F AirVariable
1N5054 Diode
1N645 Diode
1N270 Diode
6.2V Zenner Diode
270K ....•.1W Resistor
510 A 1/4W Resistor
1200./1 1/4W Resistor
330 A. 1/2W Resistor
270./2. 1/4W Resistor
C31
R7, 13
R8
R9
RFC1, 3
RFC2
RFC4
VI, 2
Q1
Q2
C3
L1
L2, 3
N1
F1
T1
K1
K2
81 2 3
IC 1
S4
R12
M1
D8
Rll
L4-5
C30-'32
240 pF SM
33.n. 1/4W Resistor
2200ft 1/4W Resistor
10ft 1W Resistor
Ohmite Z-144 Choke
47.•.•H Choke
Ohmite Z -28 Choke
6JU6 Vacuum Tube
MPS6516 Transistor
2N696 Transistor
100 pf 1KV Disc Ceramic
Tank Coil
• 56AtH Coil
#53 12-15V Lamp
3 Amp Fuse
Transformer
3 PDT 12VDC Relay
SPDT 12VDC Relay
SPST Switch 10 Amp
MC1550/G Integrated Circuit
DPST Switch
4.7Kfi.. 1/2W Resistor
Relative Power Meter
1N34 Diode
10K.ft 1/2W Resistor
Filter Coil
180 pF SM

i=
.•
rl
..
,,~
u..•
~
,.,f
't
'8
p~
~~
P
B
51 +r-f
'
jie
o:~~
I--
I I ~ I ~ I
0:
I ~ I
L _

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 characters.
Remove knobs and replace controls cover before putting the
Amplifier into busi ness radio service ..
For operation on the six meter amateur band it is necessaryto
short out three turns from the left hand side as viewed 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. This
can be done by solderi ng a wi re from the input to the output
and removing the three silver mica capacitors (180pF and
240pF) from the small circuit board connected to the output
socket.
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 t en
set the 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 MHz
Operation.
REMOVE FOR tI METER
AMATEUR BAND
OPERATION
IOOpt CAPACITOR
ACCROSS C-17
,A. portion of the incoming circuit is coupled to the baseof 01
sensing transistor Th is causes01 to conduct and change the bias
on 02, relay transistor. 02 conducts heavily and closesrelay K1.
Relay K 1connects the input signal to the cathodes of V 1 and V2,
applies plate voltage' to V1 and V2, and connects the output
circu it to the antenna.
C18 is the Pi·net tune capacitor and setsthe operating frequency
of the amplifier.
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
extned the drop out time.
An integrated circuit amplifier increasesthe level of the incoming
signals from the antenna before it is applied '0 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 switch 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:
1. The defect is not the result of misuse, neglect, accident,
incorrect wiring not our own, improper installation or use
contrary to instructions.
2. The unit serial number has been registered by the original
purchaser.
3. The unit or part that appears defective is delivered prepaid to
the manufacturer or authorized service center that we may
designilte.
4. Examination discloses, in our judgement, a defective part or
workmanship.
DRIVER
TRANSMITTER
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. :0
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
liabil ity is the repair at no charge of any defect for the period
stated.
This written warranty is in lieu of all warranties expressed or
Impl ied and no representative or person is authorized to assume
for us any (;ther liability in connection with the sale of our
products.
The manufacturer reserves the right to make any changes deemed
necesSJrv or desirable to improve the product without incurring
obligation to make (or furnish parts for) like changes in units
previously manufactured or sold.
All Warrilnties are void one year after the last model has been
manufactured.