User manual UNIDEN MHS550

[. . . ] Maritime Radio Services Operation Warning!This transmitter operates on channels/frequencies that have restricted use in the United States. The channel assignments include frequencies assigned for exclusive use of the U. S. Coast Guard, use in Canada, and use in international waters. [. . . ] Use either or to reach one of the 14 available channels. Press PTT while holding the radio a few inches from your mouth. Note: if you encounter communication interference from other FRS users in your area, enable the CTCSS encoding. See Setting CTCSS Codes on Page 41. Operation - AM Band The AM Band lets you listen to standard AM broadcasts between 500 and 1800 KHz depending on the chosen frequency step option. To select that option, and others, refer to Accessing the Menus on Page 35. Press or to step to the desired AM station. The stations are selected rapidly and the radio stops on the next strong station. Uniden MHS550 Radio Owner's Manual 3 Note: AM broadcasts are subject to interference from many outside sources, as well as weather disturbances. The signal strength and atmospheric conditions can also play a part in reception. Operation - FM Band 1. Momentarily press BAND/1/2. 5/5W to switch to the FM band. Press either or to select a local FM station. The default (USA) step option is 00MHz per press of either the or key. If selected, Europe replaces USA in the upper right corner of the LCD. Note: Typical FM broadcasts rarely reach more than 30 miles from the transmitter and terrain may also be a factor. . Operation - Aircraft Band 1. Momentarily press BAND/1/2. 5/5W to change to the aircraft band. Hold down either key to change frequencies rapidly. . · The default aircraft step option is 5KHz steps per press of either the or key. · After holding for more than a second, if you release it, the radio will scan all frequencies until it finds a signal, and will stay on that frequency. Uniden MHS550 Radio Owner's Manual 33 · Memory channels can be added and deleted as in VHF mode. Press SCAN/MEM to scan those channels in memory until a channel with signal is reached. Using the Radio Menu Options The MHS550 lets you select options that personalize your use of the radio and makes using it more convenient. Each band has menu options specific to that band. To access the menu options for any band, press MENU. The options for each band are: Marine Band FRS Band AM Band FM Band Aircraft Band 34 Uniden MHS550 Radio Owner's Manual Accessing the Menus To access the menu selections for each band, change to that band and press MENU. To exit a menu for any band, press MENU again or use or to scroll to EXIT on that menu. Then press ENTER to return to the previous screen. Note: if during any of the following operations you fail to press a key or make a selection in more than 30 seconds, the radio returns to standard marine mode. [. . . ] Output: 12VDC, 1A Antenna Connectors Controls and Switches Display Backlight Cabinet Size Weight Speaker Microphone Supplied Accessories Operating Temperature Storage Temperature AC Adapter Regulation Battery Life (Li-Ion) Waterproof Grade Compliant to JIS7/IPX7 Immersion Protection Standards. Submersible in one meter of water for 30 minutes without damage. Transmitter Items Frequency Tolerance @ 25° C to 50° C Frequency Stability -20° C to 50° C Carrier Power (MRN, 5W) (MRN 2. 5W) (MRN 1W) (FRS/MRN 0. 5W) Spurious Emission (MRN 5W) (MRN 2. 5W/1W) Modulation Frequency Response 500Hz 2000Hz Microphone Sensitivity (MRN for ± 3kHz Deviation) (FRS for ± 1. 5kHz Deviation) Maximum Deviation@100mV Input (MRN) (FRS with Subaudio) Modulation Distortion 750 S De-emphas 0. 3 to 3kHz BPF Hum and Noise 750 S (MRN) De-emphas 0. 3 to 3kHz PF (FRS) Current Drain @ High Power 5W (MRN) (FRS) Unit Nominal PPM ±0. 5 PPM W 5 W 2. 5 W 1 W 0. 5 dBc 53 dBc 58 dB -6 dB +6 mV 6 mV 6 ±kHz 4. 5 ±kHz 2. 3 % 0. 6 dB dB mA mA 38 35 1500 650 58 Uniden MHS550 Radio Owner's Manual Specifications (cont. ) Receiver Items Sensitivity for 12dB SINAD (MRN) (FRS) (FM Broadcast) (Air) (AM Broadcast) Threshold Tight (FRS) Unit V V V V V V V dB dB Nominal 0. 3 0. 35 1. 0 1. 0 1. 0 0. 1 0. 7 8 6 -6 6 -6 72 40 63 75 -65 50 37 42 53 42 1. 2 0. 45 2. 9 72 220 Limit 0. 4 max 0. 5 max. 250 max. Squelch Sensitivity CTCSS/DCS Opening SINAD Audio Freq. (MRN) @ 500Hz (MRN) @ 2000Hz (FRS) @ 500Hz (FRS) @ 2000Hz Adjacent Channel Selectivity IM Rejection(MRN) Image and Spurious Rejection Conducted Spurious Emission at the antenna terminal Hum and Noise Ratio dB dB dB (MRN ±25kHz) dB (FRS ±12. 5kHz) dB dB (MRN) dB dBm (MRN) (FRS) (AM Broadcast) (FM Broadcast) (Air) dB dB dB dB dB % W V mA mA THD @ Standard Output Power (MRN) Audio Output Power @ 10% THD (MRN) Oscillator Dropout Voltage (MRN) Current Drain @ No Signal (MRN) Current Drain @ Maximum Output (MRN) Uniden MHS550 Radio Owner's Manual 59 USA Channel Frequencies Ch No. [. . . ]