Midland I3-795 Manual de usuario

ülDLAND

COM IVIUfSIIC/VTIО ISJS COM PANY

Your new Midland 13-795 is a combination receiver-transmitter designed and

citizens band channels by the ederal Communications Commission. You are

required to read and understand Part 95 of the .C.C. rules and régulations prior

to operation of this unit. Part 95 régulations are available for $2.00 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. régula

tions will be violated if you transmit with this unit prior to receipt of your license.

Your 13-795 is a versatile, Professional quality transceiver and we strongly sug-

gest that you read this Owner’s Guide carefully before operation so that you may

receive full benefit from its many features.

Operating range will vary from 1 to 10 miles, depending on terrain, interférence,

climatic conditions, and the other transceiver used. Using a mobile or base station

antenna will increase range. Generally, operating range is greater in open country

than in an urban center. Battery condition also affects range and fresh batteries

will provide for better range than weak ones.

built for licensed Class'D* operation on any of the 23 frequencies designed as

BATTERY/R F PC

S-METER CONDI

INDICATOR

CHANNEL SELE

EXTERNAL

MICROPHON

JACK

PUSH-TO-T/3

BAR

------

TELESCOPING ANTENNA

-------

VARIABLE S UELCH

CONTROL

EXTERNAL POWER JACK

HI-LO POWER SWITCH

SPEAKER/MIKE

.CHARGE JACK

VOLUME/ON-OFF

CONTROL

ANTENNA JACK

EXTERNAL

IGURE-1

EXTERN AL SPEAKER JACK

CHANNEL SELECTOR

Controls both transmitter and receiver frequencies simultaneously and may be

set to any of the 23 positions indicated. All necessary crystals are supplied for

full 23 channel operation.

VOLUME/ON-OFF

Turns the set on and Controls the sound output from the speaker when receiving.

The volume control does not affect transmitting output.

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

operation. It functions only in 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. Careful adjustment is necessary as settings

too far to the right will not allow weaker signais to release the squelch.

HI-LO POWER SWITCH

This Controls the transmitter-output power. This is an important control and when

properly used will greatly extend battery life. or short or medium range com

munications, set this switch to low. In this position, the power input is reduced

to 2 watts. or long range use or when maximum power is needed to get through

interférence, move this switch to high position.

PUSH-TO-TALK BAR

This Controls both the transmitter and the receiver. To transmit, press and hold

the bar, to receive, release it.

EXTERNAL ANTENNA JACK

External antennas, either mobile or base may be plugged into this jack and will

increase the units range. The built-in antenna is not extended when an external

antenna is being used.

CHARGE JACK Y

Permits recharging of rechargable batteries without removal from the case.

EXTERNAL POWER JACK

Permits Use of an external 15 volts DC supply.

(SEE MOBILE AND BASE OPERATION)

EXTERNAL SPEAKER JACK

Permits the use of an external 8 ohm speaker. When the external speaker is

plugged in, the speaker in the set is disconnected in the receive position. The

built in speaker/mike will still function normally in the transmit position.

In the transmit position, it measures the relative output power of your transmitter.

In the receive position, it measures the relative strength of incoming signais and

the condition of the batteries. (See figures 2 and 3)

BATTERY/R POWER/S-METER CONDITION INDICATOR

AVERAGE INCOMING SIGNAL

--------

1 i

-------

NORMAL BATTERY VOLTAGE

BATTERY CONDITION

SIGNAL STRENGTH

POWER

IGURE-2

BATTERY INSTALLATION À

When replacing batteries, turn power switch off.

Note: This transceiver opérâtes from 15 volts DC and may be powered by 12

1.25 volt nickel cadmium rechargable cells or 10 1.5 volt regulär "AA"

type penlight cells. When using penlight cells, 2 dummy batteries (sup-

plied) must be used.

Due to the high current drain of this unit, nickel cadmium or alkaline cells are

recommended.

To replace batteries, loosen the two large slotted screws located on the bottom

and back of the case. (See figure 6)

Carefully disconnect the battery power plug.

Refer to figure 4 for regulär penlight cell installation. Note: Dummy batteries

must be placed as shown.

Refer to figure 5 for nickel cadmium cell installation.

Connect power plug and replace cabinet back.

BATTERY INSTALLATION FOR REGULAR PENLIGHT CELLS

1. USE 10 HEAVY-DUTY VA VOLT "AA” ALKALINE BATTERIES AND 2 DUMMY BATTERIES

PLACE 2 DUMMY BATTERIES HERE 12 SERIES-CONNECTED BATTERY CELLS

BATTERY

POWER PLUG

(CONNECTS TO POWER SOCKET IN MAIN UNIT) IGURE-4

BATTERY INSTALLATION FOR NICKEL-CADMIUM BATTERIES

1. USE 12 NICKEL-CADMIUM RECHARGEABLE BATTERIES (1.25 VOLTS EACH)

12 SERIES-CONNECTED BATTERY CELLS

(EACH TUBE HOUSES 2 CELLS)

1. Extend the antenna to its füll length or connect an external antenna.

NOTE: Transmitting without any antenna may damage the output transistors.

2. Turn the volume/on-off switch to the on position.

3. Check the meter to be sure your batteries are good.

4. Set the channel selector to the desired channel.

5. Adjust the volume and squelch Controls.

6. To transmit, press and hold the push-to-talk bar and talk into the speaker/mike

grill. Use a normal tone of voice and hold the unit about 2 to 3 inches from

your mouth. To receive, release the push-to-talk bar.

or best transmission and réception when using the built in antenna, it should be

held in a vertical position.

MOBILE OPERATION

This unit may be used in a vehicle, drawing its power from the car or boat battery

system and using a mobile antenna installed on the vehicle. However, this unit is

designed to operate from 15 volts DC and slightly reduced performance may be

noticed when using a 12 volt supply system.

BASE STATION OPERATION

This unit may also be used as a base station with a suitable base station antenna.

SPECIFICATIONS

Circuit system

Semi-conductor

Frequency

Modulation

Operation

Antenna

Speaker-Microphone

Controls

External jack

Power source

Cabinet

Dimensions

Weight

Receiving section

Transmitting section

Accessories included

Receiving section

Crystal controlled dual conversion superheterodyne with RF

amplifier füll variable squelch and noise limitter.

Transmitting section

Crystal controlled oscillation, collector modulation system.

16 Transistor plus 1 Transistor in squelch circuit.

1 Zener Diode

5 Diodes

1 Thermistor

1 Varistor

27 MHz citizen band synthesized system

23 Channels

AM - High Level

Push-to-talk system

Telescopic, 10 section, 69"

2%" Dynanic speaker, 100 ohm

Channel selector switch, full variable squelch, OFF-ON volume

control, battery saving switch.

External power jack, Charger jack, External speaker jack, External

mic jack, External antenna jack.

15 volts DC

Ali metal with diecast chrome grille

10-3/8" High x 3-3/8" Wide x 2-3/8" Deep.

3-3/4 pounds.

Sensitivity 1 juV at 10dB S/N

Squelch sensitivity 1 juV Nominal

Intermediate frequency

Ist 5.995MHz/6.015/6.025/6.035

2nd 455 KHz

Audio output 0.5 watt

Power input 5 watt

Frequency tolérance ± 0.005%

Leather case, carryîng strap, two(2) dummy batteries and instruc

tion booklet.

SERVICE INFORMATION

The technical information, diagrams, and charts provided in this manuał are sup-

plied for the use of a qualified holder of a first or second dass radiotéléphone

license in servicing this transceiver. It is the users 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 tuning adjustment. Transmitter adjustments are prohibited by the

.C.C. unless you hold a first or second dass radiotéléphone license or are in the

presence of a person holding such a license. A Citizens Band or Amateur license

is not sufficient.

MIDLAND COMMUNICATIONS COMPANY HEREBY

CERTI IES THAT THIS UNIT HAS BEEN DESIGNED

AND MANU ACTURED IN ACCORDANCE WITH VOL. 6,

PART 95 O THE CURRENT CC RULES AND REGULATIONS

AS O THE DATE O MANU ACTURE.

DISASSEMBLY INSTRUCTIONS

To remove the back cover, loosen the two large slotted screws located on the

bottom and back of the cabinet (Refer to@and(d), igure 6).

To remove the front panel, loosen the set screws in the volume, squelch, and

channel selector knobs and remove these knobs. Then remove two phillips head

screws from each side of the cabinet. (Refer to@ and®, igure 6)

@ REMOVE THESE

TWO PHILLIPS HEAD ®REM O VE THESE

TWO PHILLIPS HEAD

ADJUSTMENT GUIDE

Caution: The antenna must be fully extended, or a suitable load applied when

transmitting or the output transistors may be damaged.

Transmitting section

1. Set the channel selector to channel 13.

2. Connect an R power meter to the external antenna jack. (Antenna with-

drawn).

3. Connect a suitable, metered, 15 volt power supply to the external power jack.

4. Press the push-to-talk switch and adjust the transmitting coil only, for maxi

mum R output. (Note current drain from power supply)

5. Disconnect the R power meter and fully extend the antenna.

6. Press the push-to-talk switch and adjust the antenna loading coil for the same

power supply current drain as obtained in step 4.

Receiving Section

1. Adjust a signal generator to 455 K Iz with 30% modulation at 1 KHz.

Adjust the 4 transformers of the second I stage for maximum indication on

the front panel output meter.

2. Set the channel selector to channel 11. and using another transceiver or trans-

mitter as a signal source, adjust the antenna coil, the R coil, and the 2 trans

formers of the first I stage for maximum indication on the output meter.

FRE UENCY SYNTHESIZER CRYSTAL Г ■ , - ■ ■ ■■ — — 4

COMBINATION LIST

(A) Group 6 pcs. (B) Group 4 pcs. (C) Group 4 pcs.

(Transmitting) (Receiving)

a. 33.000 MHz a' :6.035 MHz a" :6.490 MHz

b. 33.050 MHz b' :6.025 MHz b" :6.480 MHz

c. 33.100/ MHz c' :6.015 MHz c” :6.470 MHz

d. 33.150 MHz d' :5.995 MHz d" :6.450 MHz

e. 33.200 MHz

f. 33.250 MHz

CHANNEL FRE UENCY(MHz) Combination Combination

(Transmit) (Receive)

1. 26.965 a-a' a-a"

2. 26.975 a-b' a-b"

3. 26.985 a-c' a-c"

4. 27.005 a-d' a-d"

5. 27.015 b-a' b-a"

6. 27.025 b-b' b-b"

7. 27.035 b-c' b-c"

8. 27.055 b-d' b-d"

9. 27.065 c-a' c-a"

10.27.075 c-b' c-b"

11. 27.085 c-c' c-c"

12. 27.105 c-d' c-d"

13. 27.115 d-a' d-a"

14. 27.125 d-b' d-b"

15. 27.135 d-c' d-c"

16. 27.155 d-d' d-d"

17. 27.165 e-a' e-a"

18. 27.175 e-b' e-b"

19. 27.185 e-c' e-c"

20. 27.205 e-d' e-d"

21. 27.215 f-a' f-a"

22. 27.225 f-b' f-b"

23. 27.255 f-d' f-d"

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