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HM35 Series – User's Manual
Midland
Model 70-3350
Vehicular VHF Transceiver
Model 70-5445
Vehicular UHF Transceiver
User's Manual
Copyright © 2004 by Midland Radio Corporation; all rights reserved.
This device complies with part 15 of the FCC Rules
Operation is subject to the following two conditions:
1. This device may not cause harmful interference,
and
2. This device must accept any interference
received,
including interference that may cause undesired
operation.
Rev. 2.0 on 1 March 2004
Page 1 of 32
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Summary of Contents for Midland 70-3350
- Page 1 Model 70-5445 Vehicular UHF Transceiver User’s Manual Copyright © 2004 by Midland Radio Corporation; all rights reserved. This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions: 1. This device may not cause harmful interference, 2.
- Page 2 CAUTIONS The antenna connector must be snugly tightened to maintain proper electrical connection and moisture resistance. Equipment must be grounded according to Midland Radio Corporation installation instructions for safe operation. Equipment should be serviced only by a qualified technician. Refer to radio service manual for additional information on installation and safety precautions.
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Page 3: Table Of Contents
HM35 Series – User’s Manual In this manual… GENERAL INFORMATION FOR THE HM35 SERIES..................5 ABOVE ALL… SAFETY! ..........................6 Conventions and Symbols Used in This Manual......................6 Warnings ..................................6 Security ..................................6 2.3.a General precautions ............................6 2.3.b Operating conditions/usage.......................... - Page 4 HM35 Series – User’s Manual 10.3 Locking microphone’s keypad............................. 25 10.4 Signal reception attenuator ............................26 10.5 Talk Around................................. 26 10.6 Confidential transmission (optional scrambler board) ....................26 10.7 Audio amplifier (PA function)............................27 10.8 Auxiliary output................................27 10.9 External alarm ................................27 CLEANING AND MAINTENANCE ........................
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Page 5: General Information For The Hm35 Series
HM35 Series – User’s Manual ENERAL INFORMATION FOR THE HM SERIES This user’s manual describes the standard functions of the HM35 series of vehicular transceivers, available in different versions which vary according to frequency band. HM35 is a robust vehicular radio “SYSTEM” equipped with highly advanced functions that have been designed for ease of use and flexibility for various needs, thanks to “Flash EEProm”... -
Page 6: Above All
HM35 Series – User’s Manual … ABOVE ALL SAFETY 2.1 Conventions and Symbols Used in This Manual Notes such as this one indicate practical advice that we recommend following for simplified use of the device, and for optimal performance. Warning symbols such as this one indicate a crucial description for avoiding serious inconvenience, possible damage to the device, and potential danger to yourself or other persons. -
Page 7: Installation
HM35 Series – User’s Manual 2.3.b Installation • Installation and removal of the radio should be carried out only by experienced technicians. The information found in this manual are meant solely as a complement to the experience held by the technician, who should assume full responsibility for the installation. -
Page 8: Parts Of The Radio And Their Use
HM35 Series – User’s Manual ARTS OF THE RADIO AND THEIR USE 3.1 Front panel Display - constantly displays the operating status of the device and guides the use of various functions through a series of icons and messages. On/Off-Volume knob – used for turning the radio on/off and for adjustment of reception volume. Microphone socket –... - Page 9 HM35 Series – User’s Manual [10] Input/output connector – for connection to the external speaker and for activation of external devices. For connections, refer to Par. 13.1. [11] Antenna socket - this SO 239 (UHF) socket is for connecting a suitable antenna. Another option is to use a BNC-type connector.
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Page 10: Checking The Parts
HM35 Series – User’s Manual HECKING THE PARTS 4.1.a Package contents Transceiver Power cable Vehicle bracket with screws and knobs for mounting Mounting piece for microphone, with screws User’s manual (this manual!) Depending on the model, some parts may already be attached/connected to the device. If any parts are missing or damaged, contact your vendor as soon as possible. -
Page 11: Advice For Installation
HM35 Series – User’s Manual DVICE FOR INSTALLATION WARNING! Installation of this device must be performed by qualified persons who are equipped with the proper tools. The information provided below are designed solely as a complement to the experience held by the technician, who should assume full responsibility for the installation. -
Page 12: Connections
HM35 Series – User’s Manual When used in a vehicle, the radio offers optimal performance when the antenna is installed at the center of the roof, in a vertical position that is free of obstacles. 5.3 Connections A faulty connection (or connection with an unapproved device) can seriously damage the transceiver, as well as people or objects. -
Page 13: Basic Operations
HM35 Series – User’s Manual ASIC OPERATIONS IMPORTANT! One or more functions among those described from this point onwards can be rendered inactive by your radio network administrator, and depending on the radio’s programming. For this reason, you may find you are not able to access one or more of the functions, or that some functions may differ from the below descriptions. -
Page 14: Monitor
HM35 Series – User’s Manual 3) Press menu/↵ to access the sub-menu. will appear on the display, and a horizontal bar will show the level of SQUELCH squelch intervention currently being used. 4) Hold down the button until the background noise is continuous. 5) Now press the button to gradually increase the level of squelch intervention, stopping as soon as the noise disappears. -
Page 15: Busy Channel Lock Out (Bclo)
HM35 Series – User’s Manual 6.7.b Busy Channel Lock Out (BCLO) Activation of this function impedes the use of the PTT button when the channel is busy. Depending on the programming, the BCLO can act when it picks up any signal, or when a signal is coming from a specific CTCSS/DCS signal. -
Page 16: Use Of Commands/Options
HM35 Series – User’s Manual SE OF COMMANDS OPTIONS 7.1 How to navigate the command menu Refer to the following diagram. 1) Pressing the menu/↵ button once opens the command menu and displays the five main menus: Radio Param – settings/activation of primary radio parameters –... -
Page 17: Summary Table For The Command Menu
HM35 Series – User’s Manual 7.2 Summary table for the command menu The following table summarizes the functions of each sub-menu/setting available on your radio. Each sub- menu/setting will be explained in detail, and its location can be found by referring to the last column of this table. SU M M A RY T A B L E F O R C O M MA N D M EN U Main Menu Sub-menu... -
Page 18: Menu Diagram
HM35 Series – User’s Manual 7.3 Menu diagram ↵ menu/ Radio Param Calls Scan Home chan Lcd&Keypad Switches Monitor Call 1 Scanning Contrast Squelch Call 2 Scan esc Light Aux.Out Power User Call Chan Del Keypad Micr. Alarm Loc/Dist Emergency Edit List Pad Lock TlkAround... - Page 19 HM35 Series – User’s Manual Activates scrambler Locks the keypad of the keypad mike (MK03535-K) Activates the regulation of squelch level Adjusts contrast Adjusts brightness Activates auxiliary output Sends a call to the priority channel Activate/ deactivates local/distance mode Adjusts microphone sensitivity Selects high/low power Key not assigned Deletes a channel from the scan list...
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Page 20: Customization
HM35 Series – User’s Manual USTOMIZATION This section describes the settings that regulate various parameters, depending on environment and specific use of the radio; for example, display contrast, backlighting, etc. 8.1 Adjustment of microphone sensitivity Normally, the sensitivity of the microphone allows the user to speak at a distance of up to 10 centimeters from the microphone. -
Page 21: Exclusion Of Internal Speaker
HM35 Series – User’s Manual 8.4 Exclusion of internal speaker If your transceiver is connected to an (optional) external speaker, you may wish under some conditions to use only the external speaker, and exclude the internal one. To do this: 1) Press the menu/↵... -
Page 22: Use With Ctcss/Dcs And/Or Selective Calls
HM35 Series – User’s Manual CTCSS/DCS SE WITH ELECTIVE CALLS 9.1 Reception In this operating mode, your radio is programmed so that the audio is activated only when receiving a correct CTCSS/DCS and/or selective call signal. The audio will thus remain silent until you receive a correct CTCSS tone, a correct DCS code, and/or a valid selective call. -
Page 23: Sending A Variable Selective Call
HM35 Series – User’s Manual 4) Press the buttons until Call 1 Call 2 is highlighted, then press menu/↵ to make the call. The device will automatically return to the standby screen. 9.2.c Sending a variable selective call The selective variable is only available through the keypad microphone (mod. MK06/35-K). If the channel has been programmed to emit a selective variable, a * symbol will appear on the bottom left of the display, followed by the predefined variable digits. -
Page 24: Advanced Functions
HM35 Series – User’s Manual 10 A DVANCED FUNCTIONS 10.1 Channel scanning This function is particularly helpful when multiple channels have been programmed. It allows you to follow radio traffic, as well as to respond to calls from different channels. When the radio picks up a valid signal during scanning, it pauses on that channel and communication is heard on the speaker. -
Page 25: Changing The Channel Scanning List
HM35 Series – User’s Manual 10.1.d Changing the channel scanning list You can use this function to create a personalized scanning list and to set a priority channel that is different from the pre-programmed one. 1) Ensure that scanning is not activated. 2) Press the menu/↵... -
Page 26: Signal Reception Attenuator
HM35 Series – User’s Manual To reactivate the keypad, follow the procedure outlined above (at step 4, remove the When the keypad is locked, the On/Off-Volume knob, the microphone PTT, and some function keys will still remain active (depending on the device’s programming). 10.4 Signal reception attenuator If you are in an area where radio signals are too strong (e.g., near a high-powered repeater or transmitter), you may find that these signals saturate your receiver, reducing performance. -
Page 27: Audio Amplifier (Pa Function)
HM35 Series – User’s Manual 6) Exit the sub-menu by pressing the F4/E button, then press it a second time to exit the main menu and return to the standby screen. To deactivate the scrambler: 1) Ensure your receiving party has also deactivated their scrambler. 2) Follow the procedures outlined above. - Page 28 HM35 Series – User’s Manual 5) Exit the sub-menu by pressing the F4/E button, then press it a second time to exit the main menu and return to the standby screen. A faulty connection to the Input/Output socket may seriously damage the transceiver. Rev.
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Page 29: Cleaning And Maintenance
HM35 Series – User’s Manual 11 C LEANING AND MAINTENANCE 11.1 Maintenance of the radio Aside from the normal cleaning and connection efficiency check, your radio does not require any particular maintenance. As with all electrical devices, your radio requires periodic laboratory testing, otherwise its performance cannot be guaranteed. -
Page 30: Optional Accessories
HM35 Series – User’s Manual 12 O PTIONAL ACCESSORIES Optional accessories can be used to expand the range of functions available with your radio. We are constantly developing new options for you, and are pleased to list below the accessories we currently offer: •... -
Page 31: Connections
HM35 Series – User’s Manual 13 C ONNECTIONS 13.1 Input/Output rear connector The following table outlines the connections from the rear Input/Output (DB25) connector: Signal name Notes AUX OUT Not connected EXT SPEAKER FLAT UN-SQ RX AUDIO DE-EMPH-SQ RX AUDIO RX MUTE INPUT TX AF IN PTT OUTPUT... -
Page 32: Alphabetical Index
HM35 Series – User’s Manual 14 A LPHABETICAL INDEX Meanings ..............17 Advanced functions Maintenance Auxiliary output ............25 Channel scanning ............22 Cleaning the radio............27 Keypad lock ..............23 Connectors ..............27 PA audio amplifier............25 Menu Rx attenuator .............. 24 Diagram ...............17 Scrambler..............