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TABLE OF CONTENTS Specifications Installation Location Mounting the Radio Ignition Noise Interference Antenna Tuning the Antenna for Optimum SWR External Speaker Operation Control and Indicators Front Panel Real Panel Operating Procedure to Receive Operating Procedure to Transmit Receiving SSB signals SPECIFICATIONS (CB) GENERAL Channels 40 CH/AM//USB/LSB (120 ch. total) Frequency Range 26.965 + 27.405 CB Frequency Control Phase Lock Loop (PLL) synthesizer
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TRANSMITTER Power Output AM 4 Watts SSB 12 Watts PEP Modulation AM/SSB rd Intermodulation SSB 3 order, more than -25 dB th Distortion 5 order, more than -35 dB SSB Carrier Suppression 55 dB Unwanted Sideband 50 dB Frequency Response AM 350 to 2500 Hz RECEIVER Sensitivity .50 uv AM .25 uv SSB st nd IF Frequency AM/FM: 10.695 MHz 1 IF, 455 kHZ 2 IF SSB: 10.695 MHz Adj
ページ4に含まれる内容の要旨
Your new Midland model 79-290 represents cutting edge technology in the communications field. From its high tech detachable control panel to finned cast almuinum transmitter heatsink it incorporates features found on no other CB. These features include full surface mount technoloy, fiberglass printed circuit board, dual power output stage, and a digital information screen using a black matrix LCD (liquid crystal display). All the features are under microprocessor control for increas
ページ5に含まれる内容の要旨
Use of a mobile receiver at low signal levels is normally limited by the presence of electrical noise. The primary source of noise in automobile installations is from the vehicle itself. If the CB operates quietly with the car motor turned off it’s most likely that the car electrical system is generating noise. In some installations ignition interference may be high enough to make good communications impossible. The electrical noise may come from several sources. Many possibilities exist
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antenna is shortened. By continuing to shorten the antenna you will notice the SWR reading will reach a low point and then start rising again. This means that you have passed the optimum point for Channel 20. Extend the antenna a short distance and again follow the procedure above. B. Antennas which must be cut to proper length. 1. Follow the same procedure as above, but adjust the length by cutting 1/4 in. increments until a good match is obtained. 2. Be very careful not to cut too muc
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FRONT PANEL DRAWING 1. ON/OFF VOLUME (inner dual concentric). Turn clockwise to apply power to the unit and to set the desired listening level. During normal CB operation, the VOLUME control is used to adjust the output level obtained either at the transceiver speaker or the external speaker, if used. 2. SQUELCH (outer dual concentric). This control is used to cut off or eliminate receiver background noise in absence of an incoming signal. For maximum receiver sensitivity it is desired
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6. WX BUTTON. Press this button for instant selection of the NOAA weather bureau or Canadian receiver. Select the proper channel, with the rotary channel selector, for your area. It is normal to hear the same information on more than one channel, select the channel with best sound. To return to CB operation, push the WX button again. 7. MEMORY CHANNEL INDICATOR. LCD indicator showing which memory channel has been selected (1 - 4). 8. TX INDICATOR. This indicator on the LCD screen
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16. SC INDICATOR. LCD indicator showing when the scan mode is activated. 17. MIC INDICATOR. LCD indicator showing when the low power microphone mode has been selected. 18. LOC INDICATOR. Indicates the local mode of receive has been selected. 19. FRQ BUTTON. Pressing this button causes the LCD to switch between channel and 5 digit frequency display. 20. CH 9 BUTTON. Pressing this button causes instant selection of emergency channel 9. The LCD display of channel/frequency
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PRESS-TO-TALK MICROPHONE The receiver and transmitter are controlled by the press-to-talk switch on the microphone. Press the switch and the transmitter is activated, release switch to receive. When transmitting, hold the microphone 2 in. from the mouth and speak clearly in a normal ‘’voice’’. The radio comes complete with a low- impedance (500 ohm) dynamic microphone. NOTE: The receiver audio will not function unless the microphone is connected 26. LCR BUTTON. Pressing this button
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1. Be sure that power source, microphone and antenna are connected to the proper connectors before going to the next step. 2. Turn unit on by turning the VOL control clockwise on your transceiver. 3. Set the VOLUME for a comfortable listening level. 4. Set the “BD” button to the desired mode (AM/USB/LSB). 5. Listen to the background noise from the speaker. Turn the SQUELCH control slowly clockwise until the noise JUST disappears (no signal should be present). Leave the control a
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An SSB signal may be received only when the listening receiver is functioning in the same mode. In other words, an upper sideband signal (USB) may be made intelligible only if the receiver is functioning in the USB position. If a lower sideband (LSB) signal is heard when the receiver is in the USB mode, no amount of tuning will make the signal intelligible. The reason for this may be understood if you consider that when modulation is applied to the transmitter’s microphone in the USB m
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which fails due to a defect in material or workmanship within one year following the initial consumer purchase. This warranty does not include any carrying cases, earphones, or telescoping antennas which may be a part of or included with the warranted product, or the cost of labor for removal or re-installation of the product in a vehicle or other mounting. Performance of any obligation under this warranty may be obtained by returning the warranteed product, freight prepaid, along wit
