278 DS - Talkie Walkie MIDLAND - Free user manual and instructions

Frequently Asked Questions - 278 DS MIDLAND

USER MANUAL 278 DS MIDLAND

Function and location of the controls Pag.2

Installation

Pag.4

Power supply Pag. 4

Installing an antenna Pag. 4

How to operate with your transceiver. Pag. 5

Frequency band selection Pag. 5

Frequency band chart Pag. 5

Warranty Pag. 6

Technical specifications Pag. 7

Your MIDLAND 278 DS represents the state-of-the art in high-tech engineering. Designed for the Citizen Band Mobile operation, this compact package is big in performance. It is a quality piece of electronic equipment, skillfully constructed with the finest components. The circuitry is all a solid-state, mounted on rugged printed circuit boards. It is designed for many years of reliable, trouble-free performance. Your mobile CB has a built Phase-Locked Loop synthesizer circuit.

The PLL circuit achieves a new technique for generating all the required frequencies with fewer crystals. The result is much tighter frequency control and superior reliability.

MIDLAND 278 DS is equipped with the "NOISE BLANKER" (noise reducer device) that reduces considerably the audio noises up to 95% , allowing a clear communication even when the signal is disturbed.

The brand new feature of MIDLAND 278 DS is the Digital Automatic Squelch, very useful because there's no need to turn manually the squelch knob every time. The automatic squelch allows a very clear reception of all the incoming signals and eliminates the unwanted background noise.

FUNCTION AND LOCATION OF THE CONTROLS

1. Channel selector

2. Multifunction backlighted display. It shows:

A. Channel selected number

B. The received signal strength and the power of the transmitting signal

C. AM/FM mode

D. RX/TX:TX=transmit mode; RX=receive mode

E. SCAN mode

F. EMG mode

G. Frequency band selected or digital automatic squelch selected (AS)

H. LOW: displayed when the radio transmits in low power (this mode is possible with some frequency bands only - see the Frequency band chart).

I. LOCK: microphone (UP/DOWN buttons) lock enabled.

1. "EMG" button: Emergency channel. By pressing it, you will be automatically positioned on CH 9 (emergency channel). The display will show "EMG". It will not be possible to change accidentally the channel.

4.5. "Q.UP/Q.DOWN" buttons: To skip 10 channels UP (Q. UP) or 10 channels DOWN (Q.DOWN).

1. "AM/FM"(LCR) button: To select AM or FM mode. If you switch on the unit and push "AM/FM"(LCR) and "SCAN" at the same time, you will select the operating band, which will be visualised on the display.

If you select a frequency band operating in FM mode only, this button enables the LCR function (Last Channel Recall).

1. "SCAN (DS)" button: With this control, you can automatically seek for a busy channel. Turn the Squelch clockwise until the background noise is no longer heard.

Press the "SCAN" button: the transceiver will scan automatically all the channels. If you switch on the unit and push "SCAN" and "AM/FM"(LCR) at the same time, you will select the operating band, which will be visualised on the display.

DS (Digital Automatic Squelch): differently from the standard squelch, the D.S. automatically detects the squelch level that allows a clear reception of all incoming signals, there's no need to make any further adjustment. This function also eliminates the unwanted background noise in absence of incoming signals.

To select the automatic squelch:

• Turn on the radio.

• Press briefly the SCAN (DS) button. As confirmation of your selection, the display shows AS in the top right corner, in place of the frequency band in use.

• "Squelch" Control: For the maximum receiver sensitivity, the control must be regulated exactly where the receiver background noise disappears.

• "ON/OFF Volume" Control. In "OFF" position your transceiver is OFF. Turn this control clockwise to switch on the unit. Turn the knob clockwise a little more to set the audio level, until you get a comfortable reception.
• Microphone jack: Insert the mic connector into this jack.

REAR PANEL

1. "EXT" jack: external loudspeaker jack.(the internal loudspeaker is excluded)
2. Power 12.6V DC: power supply cable
3. S.Meter jack: it allows an external "S. Meter" connection
4. Antenna connector (SO239 connector type)

MICROPHONE

1. PTT: transmission button
2. UP/DOWN buttons: manual channels selector
3. LOCK button: it allows you to lock the UP/DOWN buttons.
4. 6 pin microphone connector

INSTALLATION

Safety and convenience are the primary consideration for mounting any piece of mobile equipment. All controls must readily available to the operator without interfering with the movements necessary for safe operation of the vehicle. Set the proper position in the car to install the transceiver using the supplied supporting bracket or eventually the slide bracket. Tighten the retaining screws. The fixing bracket must be close to metallic parts.

POWER SUPPLY

Be sure the transceiver is OFF. In the direct-voltage power supply, is very important to observe the polarity even if the unit is protected against the accidental inversion:

Red = positive pole (+)

Black = negative pole (-)

The same colors are present on the battery and in the fuse box of the car. Correctly connect the cable terminal to the battery.

ATTENTION

To obtain best performances we recommend to install the radio in a place with enough air circulation.

INSTALLING AN ANTENNA

1. Place the antenna as high as possible
2. The longer is the antenna, the better will be the performance
3. If possible, mount the antenna in the center of whatever surface you choose
4. Keep antenna cable away from noise sources, such as the ignition switch, gauges,etc.
5. Make sure you have a solid metal-to-metal ground connection.
6. Prevent cable damage during antenna installation.

WARNING: To avoid damage, never operate your CB radio without connecting a proper antenna. A periodical control of the cable and of the S.W.R. is recommended.

REPLACING FUSE

If you replace the fuse for DC power Cord, use F 5A 250V type. The parameters and the symbol of the fuse are indicated in the following label.

HOW TO OPERATE WITH YOUR TRANSCEIVER

1. Screw the microphone plug into the microphone jack.
2. Make sure your antenna is securely connected to the antenna connector.
3. Make sure the SQUELCH control is turned fully counterclockwise.
4. Turn on the unit and adjust the volume control.
5. Select your desired channel.
6. To transmit, press the PTT button and speak in a normal tone of voice.
7. To receive, release the PTT button.

The frequency bands must be chosen according to the country where you are going to operate.

Procedure:

1. Switch off the unit.
2. Turn it on while pushing the "AM/FM" e "SCAN" buttons at the same time.
3. Rotate the "CHANNEL" knob and select the desired frequency band (see the chart here below).
4. To stop your selection, press the "AM/FM" button.

NOTE¹: In the UK frequency band, you can select directly the EC band by pushing the “AM/FM” button for 2 seconds.

NOTE2: If you select a frequency band which operates in FM mode only, the "AM/FM" control enables the LCR function (last channel recall).

Digits displayed Country
I Italy 40 CH AM/FM 4Watt
I2 Italy 34 CH AM/FM 4Watt
D Germany	80 CH FM 4Watt / 12 CH AM 1Watt
D2 Germany	40 CH FM 4Watt / 12 CH AM 1Watt
D3 Germany	80 CH FM 4Watt / 40 CH AM 1Watt
D4 Germany	80 CH FM 4Watt / 40 CH AM 4Watt
EU Europe	40 CH FM 4Watt / 40 CH AM 1Watt
EC 40 CH FM 4Watt
E Spain 40 CH AM/FM 4Watt
F France 40 CH FM 4Watt / 40 CH AM 1Watt
PL Poland 40 CH AM/FM 4Watt
UK	England 40 CH FM 4 Watt English frequencies + EC 40 CH FM 4Watt

ATTENTION!

The frequency band definitely allowed all over Europe is 40 CH FM 4W (EC).

WARRANTY

This product is covered by European warranty rulings and should be returned to the place where purchased for repair or replacement if not repairable.

In the event it that it is returned to us by your supplier then we will either repair or replace within 15 working days from receipt. During the Warranty period, the Manufacturer or the authorized customers service will, in accordance with this Limited Warranty, remedy defects by repair or replace the product.

This Limited Warranty is only valid and enforceable in the country where the user has purchased the product.

The warranty period lasts 2 years and starts at the time of product's original purchase by the first end-user.

In the event of a product defect, please return it to the authorized customer service or to the Manufacturer himself.

To make use of this warranty, it is necessary to return to the authorized service centre:

The affected product (or accessory)
The original proof of purchase, which clearly indicates the name and address of the seller and the date and place of purchase.

The warranty does not cover normal wear and tear of the product, defects or damage caused to the Product by misuse with, or connection to, any product, accessory software and/or services not produced or supplied by the manufacturer or by use of the product for any other use than for intended use of the product.

The warranty is not enforceable if the product has been opened, modified or repaired by anyone other than the authorized service centre; if it is repaired using unauthorized spare parts or if the serial number has been removed, erased, defaced, altered or is illegible.

The warranty is not enforceable if the product has been exposed to moisture, to dampness or to extreme thermal or environmental conditions or to corrosion, to oxidation, to spillage of food or liquid or to influence from chemical products.

TECHNICAL SPECIFICATIONS

GENERAL

Channels (see the frequency band chart)

Frequency Range 26.565-27.99125 MHz

Duty cycle (% on 1 hour) TX 5% - RX 5% - Stand-by 90%

Frequency Control 20

Operating Temperature Range. -10^ / + 55^ C

DC input voltage 12.6V DC ±10%

Size. 180 (L) x35 (H) x140 (P) mm

Weight 0,850 kg

RECEIVER

Receiving system .dual conversion superheterodyne

Intermediate frequency . 1^ IF: 10.695 MHz · II° IF: 455 KHz

Sensitivity. 0.5 V for 20 dB SINAD in FM mode 0.5 V for 20 dB SINAD in AM mode

Audio output power @10% THD .2.0 W @ 8 Ohm

Audio distortion.. less than 8 % @ 1 KHz

Image rejection 65 dB

Adjacent channel rejection 65 dB

Signal/Noise ratio 45 dB

Current drain at stand/by 250mA

TRANSMITTER

Output power 4W max

Modulation. AM: from 85% to 95%

FM:1,8 KHz ± 0,2 KHz

Frequency response. 300 Hz/3 KHz

Output impedance RF 50 Ohm unbalanced

Signal/Noise Ratio 40 dB MIN

Current drain. max 2500mA

INHALT

Einführung . 1

REEMPLACEMENT DU FUSIBLE

Puissance audio. 2 W @ 8 Ohms

Distorsion. Mieux que 8 % @ 1 Khz

Réjection image 65 dB

Réjection canal adjacent 65dB

Consommation 250 mA

EMETTEUR

Puisance 4 W max

Modulation FM 1,8 KHz ± 0,2 KHz