Gladding Simba SSB User Manual

PEARCE-SIMPSON

DIVISION OF

GLADDING

CORP.

SIMBA SSB

PDF By Woody at

http://www.cbgazette.com

SECTION 1

GENERAL INFORMATION

DESCRIPTION

Your new PEARCE-SIMPSON SIMBA SSB is an all transistorized, 23-channel Citizens Band SSB/AM Transceiver. This radio is ideally suited for base
and/or mobile operation from 115V AC or 12.6V DC power source, either posi t i ve or negat ive ground. A 12V DC power cord, a 117V AC power cord and
mounting cradle are included with your SIMBA SSB. To provide the crystal-controlled, 23-channel operation, PEARCE-SIMPSON utilizes an
all-transistor HetroSync circuit.

The receiver is a sensitive superheterodyne circuit featuring: Dual convers ion, low noise RF stage, slide-o-tune, adjustable squel ch, noise blanker,
external speaker jack, and inst antaneous selection of any of t he 23 crystal controlled channels .

The transmitter section is designed around highly reliable silicon transist ors and the HetroSync circuit. This ci rcuit makes us e of the output of three
crystal -controIled oscillators which are m ixed together to produce the desired frequency. The transm itter final is a conservatively rated hi gh gain RF
power transistor.

Both transmitt er and receiver work on upper sideband or lower sideband.

SPECIFICATIONS

GENERAL:

Channels 23 Channels, Crystal-Cont rol l ed A M, Upper S i de Band or Lower Side Band
Frequency Range: 26.965 MHz. to 27.255 MHz.
Frequency Control: Synthesizer
Frequency Tolerance: 0.005%
Frequency Stability: 0.001 %
Operating Temperature Range: - 30*C to +50C
Primary Power: Input Volt age - 13.8 VDC (EIA Standard)/ 117 VAC
Antenna: 52-ohm Coaxial
Size: 15-1/16" W x6-1/4" H x 1 1-5/16" D
Weight: 16 Lbs. (approx.)

RECEIVER:

Sensitivity S.S.B.- Less than 0.2uV for 1 OdB S +N/N, A.M.- Less than 0.6uV for 10 dB S + N/N
Selectivity: S. S.B.6dB at 2.1 KHz., 60dB at 5.5kHz A.M. 6dB at 5KHz., 50dB at 20KHz
Spurious Rejection: 60dB minimum
Squelch Range: S.S.B. - A dj ustable from 0.5uV to 1,000uV A.M.- Adjustable from 0.51uV to 1,000uV -1

1st IF Frequency S.S.B.- 7.8 MHz.
2nd I.F. Frequency A.M.- 455 KHz.

Noise Blanker Series gate type (uses F. E. T. )
Slide-O-Tune Range ±600Hz.
Audio Output Power 3.5 W

TRANSMITTER:

A.M.- 7.8 MHz.

Output Power S.S.B.-15 watts, p.e.p.
Modulation Capability A.M.- 100%

Spurious Harmonic Suppres sion 50dB minimum
Carrier Suppression S.S.B.- -40dB
Unwanted Sideband -40dB
Frequency Response S.S.B.- 350Hz. to 2,50OHz.

Output Impedance 50 ohms (unbalanced)
S.S.B. Filter 7.8MHz., Crystal lattice type,

Automatic Load Control Holds p.e.p. to I dB inc rease w/ 10 dB

A.M.- 4 watts

A.M.- 250Hz. to 3,00OHz

6dB at 2.1 KHz., 60dB at 5. 5KHz.
(increase in input)

FREQUENCIES AVAILABLE FOR CLASS D OPERATION

Channel MHz Channel MHz Channel MHz

1 26.965 9 27.065 * 17 27.165
2 26.975 10 27.075 * 18 27.175
3 26,985 1 1 27.085' 19 27.185
4 27.005 12 27.105* 20 27.205
5 27.015 13 27.1 15* 21 27.215
6 27.025 14 27.125* 22 27.225
7 27.035 15 27.135 23 27.255
8 27.055 16 27.155

*Channels available for communications between units of di f ferent stations (In accordance with FCC Part 95 .4 1 (d) (2))

WARNING

FCC Rules require that ALL transm itter adjustm ents, other than those s upplied by the manufact urer as front panel operating control s, be made by or
under the supervision of the holder of an FCC i ssued I st or 2nd class radi o operator's license.

Replacement or subst itution of cryst als, t ransis tors, regul ator diodes or any ot her part of a unique nat ure, with part s ot her than those rec omm ended by
the manufacturer m ay caus e violat ion of the t echni cal regul ations of Part 95 of the FCC Rul es or viol ation of t he Type A cc eptanc e requirement s of P art
2 of the Rules.

SECTION 2

INSTALLATION & INITIAL ADJUSTMENT

IMPORTANT

BEFORE DISCARDING ANY OF THE PACKING MATERIALS, EXAMINE THEM CAREFULLY FOR ITEMS YOU MAY HAVE
OVERLOOKED.

INSTALLING FIXED STATION

For fixed station operation, connect the AC power cable from the back of the unit to an AC outlet. Connect the antenna to the A ntenna
terminal on the back of the unit.

POWER CONNECTION

The SIMBA SSB is constructed to be used in vehicles using either negative or positive ground. The red power lead is to be connected
to the positive terminal of the battery. The black lead is the Negative Lead. If the existing wiring is used be sure that it is heavy enough
to prevent voltage drop to the radio. A good source of battery voltage is at the accessory connection on the ignition switch. Using this
as a power source insures the radio will be off when the ignition switch is in the off position and power with be supplied to the radio
when it is in the on or accessory position.

ANTENNAS

BASE STATION

The directional beam type of antenna, used within its limitations, is the most effective type to deliver the strongest signals in a
particular direction. Gain in one direction is achieved by concentrating the radiated energy into a beam much as the reflector in a
flashlight. This effect is also true when the antenna is used for receiving, resulting in a stronger signal from the direction in which the
antenna is pointed and a weaker signal from all other direct. This type of antenna is very desirable for communications with stations in
a particular area. By the addition of rotator; you will able to beam your signals in any direction.

NOTE: The reference of antenna efficiency is a standard dipole antenna. For example, a beam antenna listed as having 6 db gain
means that it has 6 db of gain over a dipole (in the direction it is pointed). Each 3 db of gain is equal to doubling the power, therefore, 6
db would equal 4 times the power. A transmitter with 3 watts output would produce as strong a signal, with 6 db gain beam, as would a
12 watt transmitter feeding a dipole.

When 360-degree coverage is needed for communicating with several stations in different directions, the ground plane type of antenna
is very effective. This type affords excellent coverage for communicating with mobile stations which are constantly moving from one
area to another.

A modification of this antenna is the colinear ground plane which is actually a form of a beam. This beaming effects of the antenna are
in a vertical direction concentrating the energy nearer the ground and reducing the sky wave which would otherwise be lost.

For a base station, the whip antenna is the least desirable type and should be used only for very short range or when no other antenna
can be installed in the space available. If it is necessary that the antenna be installed on, or adjacent to the equipment, a -V" or rabbit
ear type is much more desirable.

POLARIZATION

For the most efficient communications, the antennas at each station should be mounted in the same plane, i.e. both should be vertical
or both should be horizontal. Since a major use of Citizens Bond Radio is communicating with mobile units which are equipped with
vertically mounted whip antenna, the vertical plane is preferred.

TYPICAL AUTOMOBILE INST ALLATION

MOBILE INSTALLATION

SIMBA SSB has been adjusted at the factory to

Your
52-ohm antennas available for mobile citizens band use.

For an automobile installation, a whip may be used with good efficiency because the automobile acts as a counterpoise and reduces
detuning effects. The mounting location also has a great effect on the efficiency.

The most efficient and practical installation is a full quarter wave whip mounted on the left rear deck of fender top midway between the
rear window and bumper.

The so-called "short whip" is a less efficient antenna because the radiation area is reduced. However, full use of its capability may be
achieved since a shorter antenna may be mounted in a more advantageous position on a automobile, such as in the middle of the top.

There are also newer mobile antennas on the market which are made to replace the entertainment radio antenna and are similar in
appearance.

These antennas serve three purposes: AM and FM entertainment broadcast reception and Citizens Band transmission and reception.
For a marine installation, the full-length quarter wave whip antenna is very efficient, however, it requires radials which make it hard to

mount in small boats. Another excellent antenna is the coaxial sleeve type which requires no radial. A similar antenna is the
centerloaded 1/ 2 wave which is about the same as the full length 1/4 wave whip and it requires no radials. Care must be used when
choosing one of the shortened type antennas as considerable variation in efficiency will be found between the various makes and
models. As a general rule, avoid those with short radiating elements because the greater the radiating area, the stronger the radiated
signal will be.

Your PEARCE-SIMPSON dealer is prepared to offer advice and will help you choose the most desirable antenna for your needs.

give optimum performance using a 52-ohm antenna. There are a number of

TRANSMISSION LINE

To connect an antenna to the transceiver, a 52-ohm coaxial transmission line is required. [See Figure 1 for assembling connector to
RG-58/U coaxial cable.]

INSTALLATION ADJUSTMENTS

The output circuit of the SIMBA SSB transmitter has been factory adjusted to operate into any good 52-ohm antenna. No attempt
should be made to tune the transmitter to the antenna. Instead, the antenna should be adjusted to present the lowest possible SWR
(Standing Wave Ratio). A very low SWR means that the antenna is operating at maximum efficiency and will also mean that it is
adjusted to 52 ohms. An improperly adjusted antenna causes standing waves to appear on the feed line. Since this feed line is a fixed
52 ohms, and cannot be adjusted, this mismatch appears at the transmitter. If the transmitter is adjusted to compensate for this
mismatch, both it and the antenna will no longer be operating at peak efficiency. Since the transmitter has already been adjusted for
52 ohms output and the coaxial feed line has a fixed 52-ohm value, the only remaining element to be adjusted to this value is the
antenna itself. When received, the antenna is probably cut as near as is possible to this value. The mounting location on the vehicle or
building and surrounding objects affect the antenna however, and requires that it be adjusted to compensate for them.

Many of the newer Citizens Band antennas provide means of adjusting them for lowest SWR. Instructions for doing so are included
with the antenna. For such antennas as the full quarter wave length whip, it is nec

essary to carefully vary the length until the lowest SWR is obtained. For The built-in SWR bridge is ideal for this type of adjustment.
The SIMBA SSB will work into an antenna system having an SWR as high as 3: 1. For best communications, you will want this figure

as near I : I as possible so that the antenna will be operating at its best efficiency.

NOISE SUPPRESSION

SIMBA SSB

The
vehicular installations, the noise suppression for the entertainment radio will be sufficient. Vehicles and boats not having this
suppression may require that it be installed. In most cases, installation of distributor suppressors and generator condensers will be
sufficient. In severe cases, the service of aqualified technician may be required. See your PEARCE-SIMPSON dealer for advice.

contains a automatic noise limiter on AM and noise blanker on AM and SSB, and input power filtering. In most

WARNING

Operation of this equipment requires a valid station license issued by the Federal Communications Commission. Do Not transmit with
your equipment until you have received your license. Illegal operation can result in severe penalties. Be certain that you have read Part
95 of the FCC Rules and Regulations before operating your station.

License applications are to be made on FCC Form 505 available from your nearest FCC field office. (A copy of this form is included
with your new transceiver.)

You are required to maintain a current copy of Part 95 of the FCC Rules as a part of your station records. Copies of Part 95 are
available from: Superintendent of Documents GPO Washington, DC, 20402, for a fee of $3.50.

Your station license is to be posted in accordance with paragraph 95.101 of the Rules and an executed Transmitter Identification Card
(FCC Form 452-C) is to be attached to each transmitter. (A copy of this form is included with your new transceiver.)

SECTION 3

OPERATING INSTRUCTIONS

Your SIMBA SSB operates on sixty-nine different channels. There are 23 AM channels, 23 upper sideband and 23 lower sideband.
When in the AM mode, the SIMBA SSB will hear only signals being transmitted on double sideband with full carrier (AM). The unit may
also receive SSB signals when on the AM mode but you will not be able to understand them. When operating in either of the

modes,

strong AM signals may also be 'heard. It is recommended that you return to the AM mode if you wish to listen to these signals.

So that you will better understand the difference between AM, upperside band and lower sideband, a simplified explanation of their
characteristics is in order.

An AM signal consists of a carrier frequency and two sidebands, an upper and lower. Each sideband is an exact duplicate of the other.
An AM receiver, when it detects an AM signal, filters out the carrier so that you hear only the intelligence on the sideband. If you listen
to an AM signal when your receiver is in the sideband mode, the receiver will not reject the carrier frequency (unless the clarifier is
tuned exactly right) and a steady tone will be heard as well as the intelligence. Therefore, for best reception of AM, your mode selector
should be in the AM position.

When transmitting on single sideband, no carrier and only one sideband, either upper or lower, is being transmitted. W hen on AM,
your receiver cannot take just this one sideband and change it into usable intelligence. You can recognize a-sideband signal coming in
on AM by its fluttering characteristic and its unintelligible sound. A signal transmitted on upper sideband can only be properly heard by
a receiver tuned to the upper sideband.

When listening to a sideband signal on the proper mode, it may sound either too high pitched or too low pitched. The reason for this is
that your receiver may not be tuned to the exact same frequency as the transmitter it is listening to. For this reason, SIMBA SSB is
equipped with a Clarifier. By turning this Clarifier, you slightly change the frequency of both your transmitter and receivers (within legal
limits)

that reception will be in a normal tone.

so

SSB

CHANNEL SELECTOR

The channel selector switch has 23 operating positions. This switch sets both transmit and receive frequencies simultaneously by
switching the proper crystals into the

MODE SELECTOR

This selector enables you to select either of SSB modes (upper sideband or lower sideband) or

PEARCE-SIMPSON

HetroSyncTM circuit for any of the 23 CB channels.

AM.

This switch changes both

transmitter and receiver simultaneously on each mode.

VOLUME CONTROL AND ON-OFF SWITCH

This control turns the power

RF GAIN CONTROL

ON

and OFF, and adjusts the loudness of received signal.

This control adjusts the strength of incoming signal. If too strong signal comes in, turn it counterclockwise. If you are listening to a
weak signal, turn it clockwise for a desired listening level.

SQUELCH CONTROL

The Squelch Control is used to silence background noise (atmospheric or man-made noise) in the absence of a received radio signal.
In the full counterclockwise position, the radio is unsquelched (no noise silencing at all). In the fully clockwise position, the unit is
squelched for very strong signals.