Hy-Gain Hy-Range III 672B User manual

Your Hy-Range III is a full 23-channel transceiver designed and licensed
for Class D Citizen Band operation as designated by the Federal Com-
munications Commission (F. C. C.).
The Hy-Range III is a compact completely solid state unit providing
high reliability and low power consumption. This transceiver utilizes
a highly advanced, unique system of frequency synthesization enabling
immediate operation on all 23 channels without the need of additional
crystals or adjustments. This unit also features a fine tune control
allowing you to make adjustments for stations which may operate
slightly off frequency. Additional features include a NB (Noise
Blanker)/ AN L (Automatic Noise Limiter) switch which reduces unde-
sirable noises and a public address system which utilizes the micro-
phone and the audio stages within the transceiver.
The Hy-Range III transceiver is designed to operate from 11.5 to 14.5
volts DC. To obtain the best results from your transceiver, it is
suggested that you read all the instructions contained in this manual.

ANLi
NOISE BLANKER SWITCH MODULATION LAMP
SIGNAL STRENGTH/
RF POWER METER
POWER CORD
DC 12V)
FUSE
HOLDEREXTERNAL
SPEAKER
JACK
ANTENNA
CONNECTOR

Citizens Two-way Receiver Section
Circuit type dual conversion superheterodyne with
RF stage and 455 kHz ceramic filter
Frequency 23 crystal-controlled channels in the
27 MHz Citizens Band
Sensitivity 0.7 IlV for 10 dB (S N)/N ratio
IF frequency 1st IF: 11.275 MHz
2nd IF: 455 kHz
3 watts maximum into external
speaker jack
about 300 mA on Standby (no signal)
CB Transmitter Section
Frequency .... 23 crystal-controlled channels in 27
MHz Citizens Band.
5 watts
4 watts
8A3
Power input ...
RF Power output.
Emission .
Modulation .
Range boost .
all harmonic and spurious suppression
better than Federal Com'munications
Commission and Department of Com-
munications (DOC) requirements.
AM, 90% typical
yields high average modu lation at
average voice levels
less than 1.2 amp
nominal 50 ohms impedance
12 DVC nominal
Transmitting current drain
Antenna .
Power source .

Licensing your
Citizens Two-way
Radio in the United
States
NOTICE: It is illegal to transmit with this transceiver until you obtain
your citizens two-way radio Class 0 license. You are also required to
read and understand Part 95 of the Federal Communications Com-
mission rules and regulations before operation of this unit. License
application Form 505 is packed with your transceiver and Part 95
of the regulations may be available from your dealer; if not, you may
obtain copies from the Superintendent of Documents, Government
Printing Office, Washington, D. C. 20402.
It is also prohibited by the F.C.C. to adjust the transmitter circuit of
this unit unless you hold a current First or Second Class Radio-
telephone License.
We recommend that you refer all servIcing of any Hy-Gain products
to your nearest Hy-Gain warranty service center or consult your Hy-
Gain dealer or distributor for the service center location nearest you.
Do not tamper with any internal adjustments or settings - - such tamper-
ing can adversely after the performance of your transceiver or may, in
fact, cause your unit to operate beyond the limitations set forth for
Class 0 citizens two-way transceivers by the F. C. C.
General Considerations
Before installing the transceiver in a car, truck, boat, etc., be sure to
choose a location which is convenient to the operating controls and
will not interfere with the normal functions of the driver. The trans-
ceiver may be mounted to the underside of the instrument panel or
dashboard of a car, truck, boat, etc., by means of the special bracket
supplied with your transceiver.
Mounting Bracket
The mounting bracket may be used for base type or gimble type
overhead mounting. Secure the bracket to the underside of the instru-
ment panel by using at least four screws or nuts, washers, bolts
combinations or self-tapping screws.
DC Power Connections
The Hy-Range III may be operated from a nominal 12 VDC battery
source on negative or positive ground systems.
NOTE: Before making any power connections, determine whether the
vehicle has a negative or positive ground electrical system, then make
the following connections:
Connect the red lead to the vehicle + (positive) side of the electrical
system, and the black lead to the vehicle (negative) side of the
electrical system.

In the case of negative ground vehicles, the red lead should be con-
nected to the accessory post on the ignition switch, the voltage
regulator side of the ammeter or the accessory side of the fuse block.
The black lead should be connected to the metal firewall or any other
point that is connected to the vehicle chassis (ground).
In the case of positive ground~vehicles, the black lead should be con-
nected to the accessory post on the ignition switch, the voltage
regulator side of the ammeter or the accessory side of the fuse block.
The red lead should be connected to the metal firewall or any other
point that is connected to the vehicle chassis (ground).
Antenna Connection
The antenna should be connected to the transceiver by means of
coaxial cable. Either RG-58/u or RG-8/u coaxial cable may be used.
The cable should be terminated with a PL-259 coaxial connector.
Screw the PL-259 coaxial connector onto the antenna jack.
Caution
Do not try to transmit without an antenna connected to the trans-
ceiver.
Remote Speaker Jack
This will be used to control the built-in speaker when operating the
transceiver with the optional telephone handset connected.
Public Address (PA) Speaker Jack
This jack is used for connection of an 8-ohm PA speaker for PA
operation.

External Speaker (EXT. SP.) Jack
This jack can be used with any B-ohm earphone or speaker. Inserting
a 3.5 mm plug into the jack automatically silences the internal speaker.
Tune-up
In most mobile installations, ignition noise is a problem.
Before beginning any special noise suppression steps, be sure that the
vehicle is well-tuned. Clean and tighten all electrical connections,
including alternator, battery, regulator and coil connections. Perform
the following maintenance steps as necessary. Solder any crimped
spark plug or distributor leads; clean and regap or replace spark plugs
and ignition points; and check and clean alternator rings or generator
brushes. Retune the engine at the manufacturer's recommended
intervals.
Corrective Steps
Usually several sources of noise are present in any vehicle, with the
strongest covering the others. In order to find and eliminate the
maximum number of noise sources, you will have to start with the
strong sources and then work back. To be sure the noise you hear
comes from your vehicle and not outside it, drive to a relatively quiet
location (free of man-made electrical interference such as noisy power
lines, industrial noise or other vehicles). Test for noise with a weak
signal on the channel and the engine off. Then start the engine.
Ignition noise will probably be present at all engine speeds. If it is
severe, it may make a normally readable signal unreadable. To reduce
ignition noise, install resistor-type spark plugs if these are not already
installed. If non-resistance ignition wiring is used, install a 10 k-ohm
suppressor resistor at each spark plug tower of the distributor. Install a
coaxial capacitor at the ignition coil primary as close to the coil
primary as possible. This capacitor can be purchased from an elec-
tronics parts company or an automotive electrical service company.
A whining noise which varies with engine speed and continues with
the ignition turned off and the vehicle coasting in gear is character-
istic of the alternator. Check and clean it and install an alternator filter
(same sources as above).
An irregular, clicking sound which disappears at a slow idle character-
izes the voltage regulator. Install a 4-ohm carbon resistor as close to the
field terminal of the regulator as possible, then a .002 J.1. F capacitor
in series with and as close to the resistor as possible. Connect the
capacitor to ground. See the detail drawings of Figure 4.
Irregular popping noises which vary with road surfaces indicate static
discharge at any of several locations in the vehicle. Tighten loose
nuts and bolts and bond large areas such as the fenders, exhaust pipe,
firewall, etc. to the frame with lengths of heavy wire braid.

More Help
Figure 4 illustrates these noise suppression steps. Additional infor-
mation is available in the Radio Amateur's Handbook published by
the ARRL.
The Hy-Gain 672B transceiver does contain a noise blanker for reduc-
tion of impulse noise. However, to get the best reception, noise
suppression steps should be taken at the source of the noise.

~.lI'F COAXIAL
A
F
~~ J
5k SUPPRESSOR
IN EACH SPARK
PLUG WIRE
i
R~r~~5~~~~~~E
SPARK PLUG
BREAKER
POINTS
O.lI'F COAXI~
tf:I'F COAXIAL
[INNER FENDER WALL
SELF-TAPPING SCREW
and LOCK WASHER
(typical)
SELF-TAPPING SCREW
and LOOK WASHER
(typical)
FERROUS BRACKET.
purchased seperp.tely or
hand-formed

To turn the power on, rotate the knob clockwise. Further rotation
will increase the sound output from the speaker. To turn the power
off, rotate the knob counterclockwise until the click is heard indicating
the power is turned off from the power supply.
Squelch Control
This control is used to eliminate annoying background noise at no
signal. To adjust the squelch control properly, first turn the knob
counterclockwise until background noise is heard. Then, rotate the
knob slowly clockwise until the background noise just disappears.
At this point, the receiver will be relatively quiet under no signal
conditions, but an incoming signal will overcome the squelch action
and be heard. Since this control is variable, it can be used to provide
varying degrees of sensitivity to incoming signals. As the control is
advanced from the extreme counterclockwise position the squelch
action is progressively increased and stronger signals are needed to
overcome it. To receive extremely weak signals or to disable the
squelch circuit, simply turn the control fully counterclockwise.
RF Gain Control.
This controls RF gain when receiving. To increase RF gain (reception
sensitivity) turn the knob clockwise and to decrease turn counter-
clockwise.
Channel Selector.
Continuously rotating switch selects anyone of 23 channels for
transmit and receive operation. The PA position will be used when
the transceiver is used as a PA (public address) amplifier.
Fine Tuning.
Th is wi II be used for clear reception of stations that are slightly off
frequency. Rotate the knob for clearer reception.
Modulation Lamp.
This lights up when the push-to-talk button on the microphone is
pressed and flickers according to your voice while transmitting.
Receiver Lamp.
This lights up when the transceiver is in the receive mode.
Mic Jack.
Connect the push-to-talk microphone or the optional telephone
handset.

Signal Strength/R F Power Meter.
During reception, the built-in meter provides a relative indication
of signal strength in S units on the upper scale and thus offers
basis for comparison between one incoming signal and another.
During transmit, this will provide an indication of antenna RF
power on the lower scale. As you speak, the pointer should flicker
slightly, indicating that you are modulating the RF carrier.
AN L/NB (noise blanker) Switch.
The noise blanker will suppress much of the pulse-type interference,
ignition noise, that is often a problem. The depth of the blanking
and its relative effectiveness are determined by the signal strength of
the stations around you. This is known as the threshold level
If any station is putting out an S-9 or greater signal on any channel,
the effectiveness of the blanker will be at least partially blocked. As
far as when to use the blanker is concerned, generally, it is left on all
the time when you are operating mobile. But when operating as a
base station, you may also find it very helpful.
Don't confuse the action of a noise blanker with a noise limiter.
Noise limiters only clip off the peaks of the noise so that it is not
as annoying. This is helpfu I, but a noise blanker is much more
effective. It actually turns the receiver off momentarily so that no
noise at all is heard.
When this switch is placed in the AN L positIOn, on Iy atmospheric
type noises are reduced. But when it is placed in NB position both
the ANL and NB circuits are functioning.
CB Transmitter Operation
IMPORTANT: Do not try to transmit without a CB antenna con-
nected to the antenna connector on the rear panel.
1. Connect the microphone to the microphone socket.
2. Turn channel selector to a desired channel.
3. Depress the push-to-talk button on the microphone. Hold the
microphone 4 to 6 inches from the mouth. Speak at a normal
level. During periods of transmission, the receiver is silenced
and reception is therefore impossible. In the same way, your
signal can not be heard by another station when he is transmitting.
Each must take turns.
4. To receive, simply release the microphone push-to-talk button.

Public Address Operation
Special provision has been made for Public Address operation,
utilizing the microphone and audio stages in the unit.
1. Connect a external PA speaker to the PA jack on the rear panel.
2. Set the CB channel selector in the PA position.
3. Press the push-to-talk button on the microphone and talk into
the mic. Your voice will be heard from the external speaker
which may be mounted on the exterior of a car, boat, or building.
NOTE: The volume control on the transceiver can also control the
PA speaker output during PA operation.

If your receiver should need servicing under the warranty, contact
your Hy-Gain dealer for the Hy-Gain Service Center nearest you.
Please contact the Service Center before shipping your transceiver
to him. All equipment returned for warranty repair must be accom-
panied by your sales slip or invoice, or a copy of either.
Units that have been modified cannot be accepted for repair.
Include all information requested by the Service Center. Then pack
the unit as follows:
Check the unit to see that all parts and screws are in place. Then
wrap it in heavy paper or put it in a plastic bag. If the original carton
is not available, place the unit in a strong carton that is at least six
inches bigger in all three dimensions than the unit. Fill the carton
equally around the unit with resilient packing material (shredded
paper, excelsior, etc.). Seal it with gummed paper tape, tie it with
a strong cord, and ship it by prepaid express, United Parcel Service,
or insured parcel post to the Hy-Gain Service Center.
It is very important that the shipment be well-packed and fully insured.
Damage claims must be settled between you and the carrier and this
can delay repair and return of the unit to you.
Parts can be purchased from the factory Customer Service Department.
All parts orders must be prepaid or COD. When ordering, please
supply the following information:
1. model number of the unit
2. serial number of the unit
3. description of the part
4. part number. (if available)
Hy-Gain Warranty
Service Department
4900 Superior Avenue
Lincoln, Nebraska 68505
Attn: National Service Manager

Hy-Gain Electronics Corporation warrants all
products manufactured by it and bearing Hy-Gain
model numbersto be free from defective material
and workmanship under normal use and service
and agreesto repair such products, if investigation
discloses the defect to be the fault of our
manufacture. Hy-Gain's obligation under this
warranty is limited to repairing any such product
which, upon our examination, proves to be so
defective. All products repaired under such
warranty must be returned to the Hy-Gain
Warranty Service Department or any authorized
Hy-Gain service center, transportation prepaid by
the purchaser, within ninety days from the date
of purchase.
This warranty applies only to the original pur-
chaser. Upon receipt of equipment, the buyer is
responsiblefor checkingthe contents for damage.
Any shipping damageshould be referred to the
carrier.
This warranty does not apply to any Hy-Gain
products which have been repaired, worked on,
or altered by personsnot authorized by Hy-Gain
to do so, or products to which the repair has
injured the stability or reliability of such product,
or which has been the subject of mis-use,negli-
gence,or accident, or the serial number of which
has been removed, altered, effaced, or in any
other way rendered unidentifiable. Neither does
this warranty apply to any of our products which
have been connected, installed, used, or other-
wise adjusted other than in accordance with
instructions furnished by Hy-Gain. Nor does
Hy-Gain assume any liability for consequential
damages, and in any event, our liability shall
not exceed the original purchase price of the
product.
Accessoriessupplied by, but not manufactured by
Hy-Gain, shall carry only such warranty as is
available from the manufacturer of such goods
and are specifically excluded from Hy-Gain war-
ranties.
This warranty is void if Hy-Gain shall inspect
equipment and find that it hasbeen modified, or
improperly installed or used. This warranty is
expressly in lieu of all other warranties, expressed
or implied, and all other obligations or liabilities
on the part of Hy-Gain. No person, including
any dealer, agent, distributor, or representative
of Hy-Gain is authorized to assumefor Hy-Gain
any liability on its behalf, or in its name,except
to refer purchasersto this warranty.
All claims of defect or shortage should be
addressedto:
Hy-Gain Warranty Service Department
4900 Superior Avenue
Lincoln, Nebraska 68504
or to any authorized Hy-Gain servicecenter.
You must mail the warranty card in immediately.
Then, in making a claim, you need only furnish
the model and serial numbers of the unit. How-
ever, if for some reason, the card was not
mailed, a copy of a document, such as a sales
receipt, recording the date, place and proof of
purchase may, at the discretion of the service
department, serve to establish your warranty.
Your warranty claim letter should include all
pertinent details, along with the part or item
numbers involved. Do not return anything until
requestedto do so. You must supply the above
information~
Any returned items must haveprior authorization.
Unexpected returns are greatly delayed in handl-
ing. These delays can be avoided by writing in
advancefurnishing the necessaryinformation.
Hy-Gain reservesthe right to make changesin
design and improvements in its products without
assuming any obligation to install the same on
any of its previously manufactured products.
Further, Hy-Gain reservesthe right to ship new
and/or improved products which are similar in
form, fit, and function to the products originally
ordered.