Midland 77-857 Owner's Manual
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40-CHANNEL MOBILE TRANSCEIVER
OWNER'S GUIDE
FEDERAL COMMUNICATIONS COMMISSIONS REQUIREMENTS
Your new Midland 77-857 is a combination receiver-transmitter designed and built for licensed
Class D operation on any of the 40 frequencies designated for citizens band use by the Federal
Communications Commission. You are required to read and understand Part 95 of the F.C.C. rules
and regulations prior to operation of this unit. You are
also required to complete F.C.C. form 505 and
submit it to the FCC, GETTYSBURG, PA. 17326 in order to receive your license to operate this unit.
F.C.C. regulations will be violated if you transmit with this unit without complying with procedures
explained on F.C.C. temporary license form 555-B.
You may use Form 555-B as a temporary permit while your regular Form 505 application is being
processed by the F.C.C.
Both Forms are packed with the transceiver along with a copy of part 95 regulations for your use
and convenience.
NOTE: The technical information, diagrams, and charts provided in this manual are supplied for the use of a qualified
holder of a first or second class radiotelephone 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 F.C.C. Citizens Radio Service regulations.
If you install or service your own transceiver, do not attempt to make any transmitter tuning adjustment. Transmitter adjustments are prohibited by the F.C.C. unless you hold a first or second class radiotelephone 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 parts, in order not to void the type acceptance of this model.
Midland International Corporation, Communications Division, hereby certifies that this unit has been
designed, manufactured and F.C.C. type accepted in accordance with Part 95 and Part 15, Subpart C of the
current F.C.C. rules and regulations as of the date of manufacture.
OWNER'S GUIDE
Your 77-857 is a versatile, professional quality transceiver and we strongly suggest that you read
this Owner's Guide carefully before operation so that you may receive full benefit from its many
features.
OPERATING CONTROLS CONNECTORS AND THEIR FUNCTIONS
VOLUME CONTROL/POWER SWITCH
This turns the power on or off.
This controls the sound output from the speaker when receiving or from the public address (PA)
speaker connected to the PA jack on the rear panel. The volume control does not affect transmitting
output.
PA/SQUELCH CONTROL
This transceiver has been equipped with a simple PA (Public Address) amplifier system. When operating the transceiver as a PA, place the control in the PA (fully counter-clockwise) position and connect
a suitable 8-16 ohm PA speaker to the EXT. CB/PA Jack on the rear panel. Press the Push-to-Talk bar
on the microphone and talk into the microphone, then your voice will be heard from the PA speaker.
For regular 2-way communications, turn the control clockwise. Further turning operates the squelch
and quiets the receiver when signals 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 signals are being
received.
To adjust, when no signals are present, rotate the control clockwise until the receiver is silent. Incoming signals will automatically release the squelch. Careful adjustment is necessary as a setting too
far to the right will not allow weaker signals to release the squelch.
ANL
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OFF SWITCH
An Automatic Noise Limiter, (ANL) circuit is provided for reducing undesirable atmospheric noise.
To operate the ANL circuit place the switch in the ANL position. To cut off the circuit, place it in
the OFF position.
EXT. CB
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OFF SWITCH
Model 77-857 has been designed to enable you to monitor CB calls through a P.A. speaker connected
to the "EXT. CB/PA" jack on the rear panel.
For example: if you leave your car and you are expecting a call on your radio, simply put the EXT.
CB-OFF switch in the "EXT. CB" position. This channels incoming calls through the P.A. speaker
and cuts off the built-in speaker (or speaker connected to the "EXT. SPEAKER" jack). It is possible
for you to transmit while the unit is in the "EXT. CB" mode although the unit's built-in speaker (or
external speaker) will not be operational until the EXT. CB-OFF switch is moved to the OFF position.
The P.A. function of your unit is located on the squelch control. To use your unit as a P.A. amplifier
simply turn the squelch control counter-clockwise to the P.A. position. When the unit is in the P.A.
mode, it will not act as an external CB monitor.
CHANNEL SELECTOR SWITCH
This controls both transmitter and receiver frequencies simultaneously and may be set to any of the
40 channel positions indicated. All necessary crystals are supplied for full 40 channel operation.
DELTA TUNE CONTROL
This is a 3-position switch which varies the receiving frequency for about ±1 kHz. This enables you
to receive stations transmitting slightly off frequency. Place the control in one of the three positions
where the clearest reception is obtained. This control does not affect transmitting frequency.
S/RF POWER METER
This gives the relative strength of incoming signals when receiving and RF power output when transmitting.
ANTENNA CONNECTOR
Used for antenna connection, matches PL
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259 standard type.
EXT. SPEAKER JACK
Used for an external speaker (8 ohms) connection.
This jack accepts a standard (3.5 mm0) 2 circuit phone plug. When the plug is inserted into the jack,
the built-in speaker is automatically disconnected.
EXT. CB/PA JACK
This will be used for connection of PA speaker, see "PA/SQUELCH" control and "EXT. CB-OFF"
switch in this manual.
DC POWER CONNECTOR
Used for connection of DC power cord supplied with the unit.
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