Midland 13-898B Manuel utilisateur

FEDERAL COMMUNICATIONS COMMISSIONS REQUIREMENTS J

Youf new Midland 13-898B is a combination receiver-transmitter designed, buiU, and . С. C. type

acceptcd for licensed Class D operation on any of ihe 23 frequeneies designated as citizens band

channels by the ederal Communications Commission. You are required to read and understand

Part 95 of the . C. C. rule» and régulations prior to operation of this unit. Part 95 régulations are

available from the Superintendent of Documents, Government Printing Office, Washington D. C.

20402. You are also required to complété . C. C. form 505 and submit it to the . C. C. in order to

receive your license to operate this unit. . C. C. régulations will be violated if you transmit with this

unit prior to receipt of your license.

NOTE: The technical information, diagrams, and charts provided in this manuał are supplied for

the use of a qualified holder of a first or second class radiotéléphone license in servicing

this transceiver. It is the user’s responsibility to see that this unit is operating at all times in

accordance with the . C. C. Citizens Radio Service régulations.

If you install or service your own transceiver, do not attempt to make any transmitter

timing adjustment. Transmitter adjustments are prohibited by the . C. C. unless you hold

a first or second class radiotéléphone license or are in the presence of a person holding

such a license. A Citizens Band or Amateur license is not sufficient.

When service is performed by an authorized and licensed person, care must be taken in the

replacement of parts to use only authorized pans, in order not to void the type acceptance

of this model.

Midland Electronics Company hereby certifies that this unit has been

designed, manufactured and . C. C. type accepted in accordance with

Vol. 6, Part 95 of the current . C. C. rutes and régulations as of the date of

manufacture.

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Your 13-898B is a versatile, Professional quality tranlceiver and we strongly suggest that you read

this Owners Guide carefully before operation so that you tnay receive full benefit from its many

features.

WARNING: То prevent fire or shock hazard, do not expose this applianee to rain or moisture.

SINGLE SIDEBAND

SSB (Single Sideband) is relatively new in Citizens Band Communications but has been highly effective

in commercial amateur and military usage for many years. It is a superior means of wire'iess com

munications allowing transmissions of greater distances with a minimum amount of interférence and

noise.

There are two types of single sideband transmissions, USB (Upper Sideband) and LSB (Lower

Sideband). These might be described as half signais and due to the narrow band-width required, will

travel over greater distances at lower power than ordinary AM signais. igure 1 below illustrâtes

USB and LSB signais and the reference carrier Une.

Carrier reference

Figurę 1

2 -

în the actual transmission o£ either USB or LSB, the carrier is removed. AU of the modulation for

a transmission is concentrated in either the Upper of Lower sideband. In the receiver, the carrier

is reconstrueted and the intelligence or modulated voice is then detected, amplified and converted

into an audible sound heard at the speaker.

AM (Amplitude Modulation) has been the standard method of Citizens Band B réception and

transmission for many years’and most of the existing transecivers being used today are AM. Techni-

cally, Amplitude Modulation is Double Sideband (DSB). In this method of operation, a carrier is

transmitted which is modulated or mterrupted by voice on both positive and negative sides as re-

presented by figure 2.

Figure 2

COMPATt ILlTY

The 13-898B is designed to be completely compatible with all current modes of Class D operation,

including single sideband, (upper or lower), double sideband, or conventional AM and is equipped

with separate transmit ter circuitry to provide high level AM (Amplitude Modulated) transmissions

and Ttue SSB (Single Sideband) transmissions. The receiver section is also capable of receiving AM

and SSB. The mode of operation for both receiver and transmitter sections is automatically selected

by the mode seleetor switch.

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OPERATION OF CONTROLS

DIGITAL CLOCK

TIME/ALARM SET KNOB

CLOCK FUNCTION KNOB

CHANNEL SELECT0R

MICROPHONE

CQNNECTOR

PUSH TOTALK

MICROPHONES

PHONE

JACK

SIGNAL METER

FINE TUNE CONTROL

CAU5WR SWITCH

POWER ON OFF SWITCH j

RE GAIN CONTROL

RF CAUBRATE KNOB

MODE SWITCH

TRANSMIT POWER/SWR METER

VOLUME CONTROL

ANL/BLANKER SWITCH

________

SQUELCH CONTROL

! CB/PA SWITCH

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ANTENNA CONNECTOR

______

TV I TRAP

PA JACK

AC POWER CONNECTOR

FUSE %A

DC POWER CONNECTOR

RECORD OUTPUT JACK-

EXTERNAL A U X IU A R Y INPU T JA C K

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OPERÄTING CONTROLS, CONNECTDRS AND THEIR FUNCTIONS

CHANNEL SELECTOR SWITCH

Controls both ttansmitter and receiver frequencies simultaneously and rnay be set to any of the 23 or

EX positions indicated. АИ necessary crystals are supplied for full 23 channel operation,

POWER PUSH SWITCH

Turm the power on or off (for AC operation O -ON-AUTO-ALARM switch must be placed in ON

position, refer to “DIGITAL CLOCK” in this manuał).

VOLUME

Controls the wund output from the speaker when receiving. The volume control does not affect

transmitting output.

RF GAIN

Controls R gain when receiving. To increase R gain (réception sensitivity) tum the knob to the

clockwise direction and to decrease counter-cloekwise direction.

SQUELCH

Quiets the receiver when signais are not being received and allows a quiet standby operation. It

fonctions only ih the receive mode and does not affect the receiver volume when signais are being

received. To adjust: When no signais are present, rotate the squelch control clockwise until the

receiver is quieted. Incoming signais will automatically release the squelch. The squelch circuit is

effective for both AM and SSB réception.

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RF CALIBRATE CONTROL

or usual operation place this control in the “R ” position (füll counterclockwise position).

This control, placed in the R position, switches in the “R meter” and your transmitting power

will be indicated on the R meter scalę (1 . . . . 10), while the push-to-talk switch is depressed.

Another use of this control is to check for SWR (Standing Wave Ratio) of your antenna system. See

“SWR Check” in this manuał.

MODE SWITCH (USB, USB & AM)

Controls the mode of operation for the transmitter and receiver simultaneously and allows sélection

of conventional AM operation or SSB operation on either upper or lower side band. In order to com-

municate. with another transceiver, you must use the same operating mode.

FINE TUNE

When receiving SSB signais, adjust the INE TUNE knob carefully and fix it at such a position where

the incoming signal сап be heard most clearly. Because of the characteristics of an SSB signal, it is

extremely important to adjust this control. With improper INE TUNING adjustment, the signal will

not be intelligible. The sound will be distorted. SSB tuning will become easy as you acquaint

yourself with the operation of this control. After adjusting it to clarify once, no adjustment is needed

if you stay on the same mode and channel, receiving the same station.

CAL SWR PUSH SWITCH

This switch will be used to check the SWR (Standing Wave Ratio) of your antenna system.

SWR CHECK

1. Connect your antenna system to the antenna conneetor on the rear panel.

2. Place the mode switch in the AM position and the CB/РА switch in the CB position.

3. Place the CAL/SWR switch in the released out position.

4. Press the push-to-talk button on the microphone and rotate the R -CALIBRATE knob so that

the SWR meter pointer reads maximum or SET. Release the push-to-talk switch.

5. Depress the CAL/SWR push switch and agam press the push-to-talk button. The SWR of your

antenna system will be indicated on the lower scale.

SWR readings of less than 1.5 are désirable, and usually obtainable with modern factory-made

anten nas in good condition.

Readings up to 2.5 may be acceptable, but readings over 3.5 should definitely be reduced by adjust-

ment of the antenna system.

NOTE: After completion of SWR CHECK, always place the R -CALIBRATE Knob in the R

(full со unter-clockwise position) position.

— 8 —

ANL BLANKER PUSH SWITCH

With this switch placed in the released ANL position undesireable noise will be considerably reduced

in AM réception. When in the depressed BLANKER position annoying impulse noise will be blanked

out. This noise blanker circuit is effective for both AM and SSB réception.

CB РА PUSH SWITCH

This transceiver may also be used as a PA (Public address) amplifier. Connect a suitable 4 - 32 ohms

PA speaker to the “PA” jack on the rear panel. Depress CB-РА push switch and press the Push-to-talk

button on the microphone. or regulär 2-way communications, the switch must be placed in released

out [CB] position.

PHONE JACK

When a headphone is inserted, it autornatically disconnects. the internal speaker.

REC JACK

Both transmitting and receiving signais are supplied to the REC jack and can be recorded if a tape

recorder is connected to the jack. This jack is not affected by the setting of the Volume control

on the front panel. Therefore the record level must be adjusted by the record-level control of the tape

recorder connected.

EXJACK

This transceiver can be operated as a simple audio amplifier if you place the channel selector switch

in the “EX” position and connect an audio source to this EX jack provided on the rear panel. The

sound output from the speaker can be adjusted by tuming the front panel Volume control knob.

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