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Ericsson GE Monogram Series MGP 300 Operator's Manual

Low band portable radio unit monogram series
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LBI-38995
Mobile Communications
Monogram
Series
Low Band Portable Radio Unit
Model MGP 300
Operator's Manual

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  • Page 1 LBI-38995 Mobile Communications Monogram Series Low Band Portable Radio Unit Model MGP 300 Operator's Manual...

  • Page 2: Table Of Contents

    ALIGNMENT INSTRUCTIONS ........ 20 Suggested Test Equipment ........20 Pre-Alignment Notes ..........21 EEPROM Programming ........21 Transmitter Alignment ......... 23 Receiver Alignment ..........24 Antenna Tuning ............ 26 MONOGRAM SERIES WARRANTY ....... 31 Copyright© September 1993, Ericsson GE Mobile Communications Inc.

  • Page 3: Operating Rules And Regulations

    OPERATING RULES AND REGULATIONS Two-way FM radio systems must be operated in accordance with the rules and regulations of the Federal Communications Commission (FCC) or, in Canada, the Department of Communications (DOC). When operating in other countries or localities, observe the appropriate rules and regulations.

  • Page 4: Operating Tips

    Willful or malicious interference with any other radio communications. Repeat or otherwise make known anything overheard on the radio. Conversations between others sharing a communications channel must be regarded as confidential. Identify by use of proper call letters at specific times.
  • Page 5 When operating with a repeater system utilizing Channel Guard, as much as 250 milliseconds may be required for tone recognition. Rapid operation of the PTT bar may cause the first syllables of words to be clipped. Battery condition is another important factor in the trouble- free operation of the radio.

  • Page 6: Maintenance

    MAINTENANCE Your Monogram Series Model MGP 300 Portable Radio is designed to be maintenance free; however, a few suggestions are offered to keep your radio in top operating condition. • Clean external surfaces of the radio with a mild solution of dishwater detergent diluted in water. Apply sparingly to avoid excessive moisture contact into cracks and crevices.
  • Page 7 • Check the battery and recharge, if necessary. • Check that the antenna is properly installed and tuned for the frequency of the radio unit. • In case of difficulty, contact a service technician for additional information.

  • Page 8: Introduction

    INTRODUCTION The Ericsson GE Monogram Series Model MGP 300 Low Band VHF Portable Radio is a lightweight, multichannel radio offering both simplex and semi-duplex operation with a wide range of options and accessories available. This Monogram Series portable radios operate within any 2 MHz segment of the frequency band with 5 watts RF output power available.

  • Page 9: Options And Accessories

    OPTIONS AND ACCESSORIES MHNC3R........Antenna, 30-35 MHz MHNC3S ........Antenna, 35-42 MHz MHNC3T ........Antenna, 42-50 MHz MHAE3J ........Speaker/Microphone MHCG1E ........CTCSS Tone Module MHCH3V ....Dual Rate Desk Charger, 120 VAC MHCH3W.....Dual Rate Multi-Unit Charger Kit, 120 VAC MHHC5W..........Leather Case MHPA5P.....600 mAh Battery, Nickel-Cadmium MHTS3R........Radio Programmer PROGRAMMABLE FEATURES...
  • Page 10 Figure 1 - Controls and Indicators...

  • Page 11: Controls And Indicators

    CONTROLS AND INDICATORS (1) ON/OFF/VOLUME Located on the top control panel, it is used to turn the radio on or off and to adjust the listening level. (2) ANTENNA Connector for antenna. CONNECTOR (3) EARPHONE JACK with optional speaker/microphone. May also be used for an external 8 ohm speaker or earphone.
  • Page 12 (7) BT/TX INDICATOR Red when transmitter is keyed (normal transmission). The LED will go dim or goes out when battery voltage is low. The battery must be replaced or recharged to restore optimum performance. (8) MICROPHONE To transmit clear messages, hold the portable radio so that the microphone is about two inches away from your mouth...

  • Page 13: Operation

    OPERATION RADIO ON/OFF Turn the radio ON by rotating the VOLume control fully clockwise (to the right) until you hear a click. Turn the radio OFF by rotating the VOLume control fully counterclockwise (to the left) until you hear a click and feel the switch enter the detent position.

  • Page 14: To Transmit A Message

    TO TRANSMIT A MESSAGE WARNING Operation of the transmitter without a proper antenna installed may result in permanent damage to the radio. Hold the radio upright with the antenna in a vertical position and the microphone about 2 inches away from the mouth.

  • Page 15: Battery Charging And Care

    control panel will be on continuously while the PTT bar is pressed and the radio is transmitting. NOTE The radio is equipped with a red LED transmit/battery indicator (BT/TX). The LED will be lit continuously while the PTT bar is pressed and the radio is transmitting. If the BT/TX LED is dimly lit or goes out completely, this indicates that the battery is weak and requires recharging.

  • Page 16: Battery Pack Removal

    Any rechargeable battery showing signs of reduced capacity should be taken to a qualified service technician to be carefully checked before being returned under warranty or scrapped. To use the wall charger supplied with the radio, unplug the optional speaker/microphone from MIC/PTT/CHG jack and then connect the wall charger plug into this jack.

  • Page 17: Rechargeable Battery Pack Disposal

    latch on the bottom of the radio in a clockwise direction until the cover is secured. Rechargeable Battery Pack Disposal The product that you have purchased contains a rechargeable battery. The battery is recyclable. At the end of its useful life, under various state and local laws, it may be illegal to dispose of this battery into the municipal waste stream.
  • Page 18 The antennas are identified by a color coded tip or rings for the different low band frequency bands. The following antennas are to be used with the various low band radios: COLOR CODE FREQ. RANGE PART NO. Yellow 30-35 MHz MHNC3R 35-42 MHz MHNC3S...

  • Page 19: Nickel Cadmium Battery Warranty

    NICKEL-CADMIUM BATTERY WARRANTY Ericsson GE Mobile Communications Inc. (hereinafter "Seller") warrants to the original purchaser for use (hereinafter "Buyer") that nickel-cadmium batteries supplied by Seller shall be free from defects in material and workmanship, and shall conform to its published specifications for a period of twelve (12) months from the date of purchase.

  • Page 20: Alignment Instructions

    ALIGNMENT INSTRUCTIONS Before the Monogram Series Model MGP 300 Low Band Portable Radio Unit is placed into service, the user's operating configuration must be programmed into the EEPROM and the transmit and receive sections of the radio adjusted for optimum performance. If the optional Channel Guard tone decoder/encoder is installed and the radio programmed for Channel Guard operation, the Channel Guard must be adjusted.

  • Page 21: Pre-Alignment Notes

    Pre-Alignment Notes The transmit frequencies should be within a 2 MHz range. The receive frequencies should be within a 2 MHz range. There is no constraint on the relationship between the transmit frequencies and the receive frequencies exceptthat they lie within the limits of the radio band (i.e., 30-35, 35-42 or 42-50 MHz).
  • Page 22 Remove battery pack from battery compartment. Locate the six screws holding the case together and remove screws. Figure 2 - Alignment Points...

  • Page 23: Transmitter Alignment

    With the battery compartment facing up, snap the case halves apart. Locate and carefully remove the optional Channel Guard printed circuit board (see Figure 2 for location). Locate and carefully remove the EEPROM. Program the EEPROM to the user's operating configuration.

  • Page 24: Receiver Alignment

    Key the transmitter and adjust C41 for maximum RF power output. Switch the radio between the highest and lowest transmit frequencies and adjust C41 to obtain the least power output variation across the transmit frequency range. Apply an audio frequency of 1 kHz at an output of 300 mVRMS (600 ohms source impedance) to the EXT MIC/PTT/CHG jack.
  • Page 25 Connect oscilloscope (and distortion analyzer, if available) across the speaker terminals. Select a programmed mid-frequency receive channel. Apply a 1000 Hz tone at 3 kHz deviation at 1 mV on the receive channel frequency to the antenna jack. Adjust the discriminator coil L19 for maximum sine wave amplitude at the speaker terminals.

  • Page 26: Antenna Tuning

    11. Adjust input to receiver for a reading of 10 dB SINAD on the SINAD meter. 12. Rotate the SQuelch control fully counterclockwise until it goes into the detent (tone) position. This enables the tone decoder. 13. Monitor U1-13 and adjust R6 until the voltage just goes high (more than 2.5 VDC).
  • Page 27 With a field strength meter in the same polarization plane as the radio antenna, use a non-conductive tuning tool to adjust the tuning capacitor for maximum field strength. After tuning, carefully re-install the set-screw into the coil cover until it is flush with the outside of the coil cover.
  • Page 28 NOTES...
  • Page 29 NOTES...
  • Page 30 NOTES...

  • Page 31: Monogram Series Warranty

    MONOGRAM SERIES WARRANTY...
  • Page 32 EMERGENCY NUMBERS Police State Police Fire Poison Control Ambulance Life Saving and Rescue Squad Ericsson GE Mobile Communications Inc. Mountain View Road • Lynchburg, Virginia 24502 Printed in U.S.A.

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