248XL - Walkie-talkie MIDLAND - Free user manual and instructions

Product type	CB walkie-talkie (transceiver)
Brand	Midland
Model	248XL
Dimensions (L x H x D)	150 x 45 x 175 mm
Weight	1 kg
Power supply	12.6 VDC ±10%
Standby current consumption	450 mA
Transmission current consumption	2500 mA max
RF output power	4 W max
Frequency range	26.565 - 27.99125 MHz
Modulation types	AM and FM
Number of channels	Up to 80 (depending on band)
Display	Backlit multifunction display
Key features	ESP2, Noise Blanker, Analog S-Meter, Dual Watch, Scan, LCR, LOCK
Microphone	With PTT and UP/DOWN keys
Antenna connector	SO-239
External speaker jack	Yes (EXT jack)
Protection	Against reverse polarity
Operating temperature	-10°C to +55°C
Certifications	Directive 99/05/EC
Replacement fuse	F 5A 250V

Frequently Asked Questions - 248XL MIDLAND

How do I select a frequency band on the Midland 248XL?

To select a frequency band, turn off the device, then turn it on while holding down the N.K. key. Use the channel selector to choose the desired band (see the band table in the manual). Then press the LOCK key to confirm the selection.

How to use the Dual Watch function?

The Dual Watch (DW) function allows monitoring two channels simultaneously. First select the first channel, then press the M2/DW button until the DW icon flashes. Select the second channel using the selector or the microphone's UP/DOWN keys, then press M2/DW again for about 3 seconds until the DW icon becomes steady. The radio will automatically switch between the two channels.

What is the meaning of the indicators on the display?

The display shows the channel number or corresponding frequency, as well as icons: EMG (emergency channel activated), LOW (reduced power), ESP (noise suppression activated), LOCK (keypad locked), DW (dual watch), SCAN (scanning in progress), M1 to M5 (memory channels). The AM/FM indicator shows the modulation mode (red for FM, green for AM) and RX/TX indicates reception (green) or transmission (red).

How do I store a channel in one of the M1 to M5 memories?

To store the active channel, briefly press the FUNC key: the display shows 'F'. Then press and hold the corresponding memory button (e.g. M1/EMG) for about 3 seconds until you hear a beep. The channel is then saved. To recall a stored channel, simply press the corresponding button.

How to activate the Scan function (automatic scanning)?

First adjust the Squelch to eliminate background noise on a free channel. Then press the M3/SCAN key: the message 'SCAN' appears and the radio scans all channels until a signal is detected. The scanning stops automatically on the active channel. To stop manually, press PTT, turn the channel selector, or press any key.

What to do if the radio does not turn on?

First check the power connection (12.6 V plug) and polarity (red wire to +, black to -). Check the fuse on the red wire: it must be type F 5A 250V. If the fuse is blown, replace it with an identical one. Also make sure the VOL knob is turned sufficiently (not in the off position).

How to adjust the squelch correctly?

Turn the SQ (Squelch) knob fully counterclockwise (background noise audible). Then slowly turn it clockwise until the background noise just disappears, at the point where reception is silent. This setting provides maximum sensitivity without annoying noise.

Can I use a different antenna from the one supplied?

Yes, you can use a suitable CB antenna with an SO-239 connector. Ensure the antenna is tuned for the band used and that the SWR (VSWR) is correct to avoid damaging the transmitter. It is recommended to periodically check the SWR with a measuring device.

How to reset the device to factory settings?

The Midland 248XL does not have a full reset function described in the manual. However, you can restore the default band (EC 40CH FM 4W) by following the band selection procedure: turn off the radio, then turn it on while holding N.K. down, then select the 'EC' band via the selector and confirm with LOCK.

What are the installation precautions in a vehicle?

Install the device in an accessible location without obstructing the driver. Use the supplied bracket and secure it firmly. Connect the power supply respecting polarity (red wire to positive). Mount the antenna on the highest part of the vehicle, preferably in the center, and keep the antenna cable away from sources of interference. Never use the radio without an antenna; check the SWR regularly.

USER MANUAL 248XL MIDLAND

Italy - Restrictions on the use - According to the Italian Frequency Allocation Table, issued on the G.U. No. 169 - Supplement 146 - of 20th July 2002 - note 49G, the standard ■ in AM modulation needs a radiating system with a gain not higher than -6dB, such as, for example, with the antenna "PC8" with original cable.

Function and location of the controls....3

Installation....7

Power supply 7

Installing an antenna 7

How to use your Midland 248XL....8

Frequency band selection....8

Frequency band chart 8

Specifications....9

Midland 248XL is a mobile transceiver whose main feature is the possibility to select any of the European CB bands with an easy and quick operation.

Midland 248XL is equipped with the "ESP2" and "NOISE BLANKER" (noise reducer devices) that reduce considerably the audio noises up to 95% , allowing a clear communication even when the signal is disturbed.

The wide multifunctional backlit display shows the number of the channel in use or the correspondent frequency even in conditions of deep darkness.

Midland 248XL is also equipped with an analogical S-Meter, showing the transmitted power and the signal received.

The unit is preset at the factory on the "EC" band, 40CH FM 4W.

FUNCTION AND LOCATION OF THE CONTROLS

FRONT PANEL

1. Channel selector: it permits the manual channel selection.
2. Microphone jack: insert the mic connector into this jack.
3. Indicator: this meter indicates the receiving signal strength and the transmitter RF output power.
4. Multifunction backlighted display.

It shows:

a. channel selected number (from 1 up 40) or operative frequency
b. FUNC button activated
c. ESP: reducing noise device activated
d. DW: Dual Watch function activated
e. EMG: indicates channel being used or when the emergency channels are activated
f. LOCK: keyboard lock function activated
g. SCAN function activated
h. M1-M2-M3-M4-M5: memory channel indicator
i. Indicates the frequency band selected.
j. It appears when the radio transmits in low power (this condition happens only in certain frequency bands – see the chart at the end of this manual).

1. "AM/FM" Indicator

It indicates the operative mode. FM: red LED; AM: green LED.

1. "RX/TX" Indicator

LED indicating receiving or transmitting mode. RX: green LED; TX: red LED.

1. "CB/PA" Selector

In the "CB" position, the unit operates as a transceiver. You can use the PA (public address) function only if you connect a speaker to the PA jack ("PA" visualized on the display). In this case the "MIC" knob controls the amplification level.

1. FUNC button

With the SCAN button, you can:

• visualize the operative frequency (if you keep pressing the button for 3 seconds approx.), or the channel in use;
• activate the second functions of the "M" (M1/M5) buttons.

M1 / M2 / M3 / M4 / M5:

Midland 248 XL has the possibility to store and to recall, when necessary, 5 channels previously memorized.

To memorize one channel, follow the procedure herebelow:

A) Select the channel with the appropriate selector or the "UP/DN" buttons on the microphone;
B) Push the "FUNC" button: the display will show "F";
C) Keep pressing the "M1/EMG" button for 3 seconds: you will hear a "BIP" and the display will show "M1".

To memorize the other preset, repeat these steps and select another

memory different from 1.

To recall a channel previously stored, push the "FUNC" switch and the button of the desired memory.

These buttons have two functions; herebelow you will find their descriptions:

9. "M1 - EMG" switch

This switch allows the storing of the first memory and the recalling of the 2 emergency channels. "M1 - EMG" selects sequentially channels 9 / 19 (emergency) and the one in use.

10. "M2 - DW" button

"M2 - DW" stores the chosen channel in the M2 memory and activates the DUAL WATCH. This function allows the synchronization on two different channels at the same time:

when a signal on the second channel is received, the conversation on the first one is automatically interrupted and the receiver switches on the second channel. The monitoring starts again 5 seconds after the signal end.

To activate this function, operate as follows:

- Select the desired channel through the channel selector or the "UP/DOWN" buttons on the microphone;

- Keep the "DW" button pressed for about 3 seconds: you will hear a "BIP" and "DW" will flash on the display.

- Select the second channel with the same procedure;

- Press the button "DW" again for roughly 3 seconds: you will hear another "BIP"; the display will permanently show "DW" and will alternatively visualize the two selected channels.

11. "M3 - SCAN" switch

The two functions of this button are: memorization of the third channel in the M3 memory and "SCAN" function activation. In this case, you can automatically seek for a busy channel:

- turn the squelch clockwise until the background noise is no longer heard;

- press the "M3 - SCAN" button: "SCAN" will be shown on the display and the transceiver will automatically scan all the channels until a carrier is being received.

This function can be deactivated in three ways: pressing the PTT button, turning the channel selector or simply pushing any other button on the unit.

12. "M4/LCR - AM/FM" button

Stores the memory number 4 and selects the operative mode (AM/FM). AM: green LED; FM: red LED. If you select a frequency band operating in FM modulation only, this button activates the LCR function (Last Channel Recall).

13. "M5 - LOCK" switch

Pressing this button, you memorize the fifth (last) memory and activate the "LOCK" function (it allows the locking of the keyboard, channel selector and "UP/DN" buttons on the microphone, thus avoiding accidental use of the keys).

14. N.K. button

Pressing this switch, you activate the reducing noise device (see introduction).

15. "MIC" knob

The amplification of the voice in TX must be adjusted with this knob. The optimum level of the modulation must be found with the help of your receiving partner.

16. "RF" knob

It controls the reception sensitivity.

To increase sensitivity, simply turn it clockwise. Sensitivity decreases turning it counterclockwise.

17. "VOL" knob

It allows the switching on of the unit and sets the volume to a comfortable audio level.

18. "Squelch" knob

For the maximum receiver sensitivity, the control must be regulated exactly where the receiver background noise disappears.

REAR PANEL

1. Antenna connector (SO239 connector type).
2. S.Meter jack: it allows an external "s meter" connection.
3. "PA" jack: by connecting with an external loudspeaker, you can use the unit as an audio-amplifier.
4. "EXT" jack: external loudspeaker jack (the internal loudspeaker is excluded).
5. Power 12.6 Vdc: power supply cable.

MICROPHONE

1. PTT: transmission button
2. UP/DOWN buttons: manual channel selector
3. 6 pin microphone connector

INSTALLATION

Safety and convenience are the primary consideration for mounting any piece of mobile equipment. All controls must be 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, to observe the polarity is very important, 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.

Connect correctly 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 the 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 SWR 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 MIDLAND 248XL

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 through the "UP/DN" buttons on the microphone.
6. To transmit, press the PTT button and speak with a normal tone of voice.
7. To receive, release the PTT button.

The frequency bands must be chosen according to the country you are in. Procedure:

1. Switch off the unit.
2. Turn it on while pushing the "N.K." button.

3. Rotate the "CHANNEL" knob and select the desired frequency band (see the chart here below).

4. To fix your selection, press the "LOCK" button.

NOTE: If you select a frequency band which operates in FM mode only, the "AM/FM" control activates the LCR function (Last Channel Recall).

NOTE: In the UK frequency band, you can select directly the EC band by pushing the "LCR-A/F" control for about 2 seconds.

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

ATTENTION!

The frequency band allowed all over Europe is 40CH FM 4W (EC) – See the "Restrictions on the use" table.

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 ....PLL

Operating Temperature Range -10°/+55°C

DC input voltage 12.6 Vdc ±10%

Size....150(L) x 45(H) x 175(D)mm

Weight 1Kg

RECEIVER

Receiving system....Dual conversion superheterodyne

Intermediate frequency .....I°IF:10.695 MHz II°IF:455 KHz

Sensitivity....0.5μV for 20dB SINAD in AM/FM

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

Audio distortion....Less than 8% @ 1KHz

Image rejection....65dB

Adjacent channel rejection 65dB

Signal/Noise ratio....45dB

Current drain at stand/by....12.6V: 450mA

TRANSMITTER

Output power 4W max

Modulation FM:1.8KHz ± 0.2kHz

AM: 85% to 95%

Frequency response 300 Hz/3 KHz

Output impedance....RF 50 Ohm unbalanced

Signal/Noise Ratio 40 dB MIN

Current drain max 12.6V: 2500 mA

A readily accessible disconnect device shall be incorporated in the installation wiring. The disconnect device shall disconnect both poles simultaneously.

Hereby, CTE International declares that Midland 248 XL is in compliance with the essential requirements and other relevant provisions of Directive 99/05/EC.

Inhaltsverzeichnis

Einleitung....2

REPLACEMENT DU FUSIBLE

7. Selector "CB - PA"

- All articles displaying this symbol on the body, packaging or instruction manual of same, must not be thrown away into normal disposal bins but brought to specialised waste disposal centres. Here, the various materials will be divided by characteristics and recycles, thus making an important contribution to environmental protection.

Produced or imported by:

CTE INTERNATIONAL s.r.l.

Via. R.Sevardi 7 - 42124 Mancasale Reggio Emilia Italy

Imported by:

ALAN-NEVADA UK

Unit 1 Fitzherbert Spur Farlington Portsmouth Hants. P06 1TT

United Kingdom

www.nevada.co.uk

The use of this transceiver can be subject to national restrictions.

Read the instructions carefully before installation and use.

Importado por:

ALAN COMMUNICATIONS, S.A.

C/Cobalt, 48 - 08940 Cornellá de Llobregat España

Tel. [phone] - www.midland.es