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Narco Avionics HT870 Operator's Manual

Handheld nav/com 960 channels
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NARCO HT870
HANDHELD NAV/COM
960 CHANNELS

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Summary of Contents for Narco Avionics HT870

  • Page 1 NARCO HT870 HANDHELD NAV/COM 960 CHANNELS...

  • Page 2: Table Of Contents

    14.5.1 PROGRAMMING OF LOCATIONS M0 TO M9 ........14.5.2 RECALLING FREQUENCY FROM MEMORY LOCATION ......14.6 OPERATION OF THE HT870 AS A COM TRANSCEIVER ......14.6.1 FREQUENCY MODE OF OPERATION (COM CHANNELS) ......14.6.1.1 FREQUENCY MODE SINGLE FREQUENCY OPERATION ......
  • Page 3 LIST OF ILLUSTRATIONS 13-1 HT870 CONTROL FUNCTIONS 13-2 MIC CONNECTOR PIN ASSIGNMENT 13-3 16-KEY KEYBOARD...

  • Page 4: Introduction

    A memory lockout feature is provided in which programmable frequencies can be locked out of the automatic or manual scan. The HT870 is powered by a rechargeable, quickly changed, NiCad battery pack. An optional nonrechargeable alkaline battery pack for emergency use is available.

  • Page 5: Specifications

    SPECIFICATIONS GENERAL Navigation channels: 200 (50 KHz steps) from 108.00 to 117.95 MHz Communication channels: 760 (25 KHz steps) from 118.00 to 136.975 MHz Memory Channels: 10 Channels Weight: 1 lb. 4 oz (570 grams) Dimensions: Width 2.44 in. (62 mm) Height 7.05 in.

  • Page 6: Preliminary Inspection And Unpacking

    PRELIMINARY INSPECTION AND UNPACKING Upon receipt of the HT870, inspect the shipping container to attempt to determine if equipment may have been damaged during shipment. Note damage, if any. Carefully unpack the unit and inspect it for any damage that may have occurred during shipment.

  • Page 7: Ht870 Maintenance Information

    Continued 50906-0001 The HT870 may be operated in both (Cont.) receive and transmit modes while it is charging, but ONLY when a NiCad battery pack has been installed. 50926-0101 6 inch adapter cable which permits the interfacing of aircraft type headphones and microphones to the HT870.

  • Page 8: Use Of External Headphones Or Speaker

    Communications Commission requires that FCC Form 404 titled "Application for Aircraft Radio Station License" be submitted prior to operation. If the HT870 is to be used as a ground station, the FCC Form 406 titled "Application for Ground Station Authorization in the Aviation Services" must be submitted prior to operation.

  • Page 9: Battery Pack Charging

    10.1 Continued 3 Months Storage Characteristics (battery fully charged and NOT connected to HT870): Storage Temperature: 0 degrees C (32 degrees F) 10 to 20 % drop in battery capacity through self- discharge 20 degrees C (59 degrees F) 30 to...

  • Page 10: Battery Pack Installation

    The HT870, when turned off, may be left on the quick charger indefinitely without harm to the battery pack. The HT870 may be operated both in the receive and transmit modes while being charged in the Desktop quick charger/stand; however, the battery charging rate drops back to the standard rate (17 hours) because a portion of the charging current is used to power the radio.

  • Page 11: Additional Antenna Considerations

    5 degrees or more on local conditions. maximum VOR range and accuracy, an aircraft VOR antenna may be used; however, it is not recommended that HT870 COM transmissions be made while using a VOR antenna.

  • Page 12: Description And Location Of Controls

    13.1 DESCRIPTION AND LOCATION OF CONTROLS Figure 13-1 HT870 CONTROL FUNCTIONS...

  • Page 13: Ht870 Top Panel Description

    13.1.1 HT870 TOP PANEL DESCRIPTION 1. Microphone Input 2. Speaker Output 3. Push to Talk Switch 4. Ground 5. No Connection 6. No Connection FIGURE 13-2 MIC CONNECTOR PIN ASSIGNMENT 13.2 16-KEY KEYBOARD DESCRIPTION FIGURE 13-3 16-KEY KEYBOARD The numbered keys are used to assign a frequency.

  • Page 14: Product Description Ht870

    13.3 PRODUCT DESCRIPTION HT870 DESCRIPTION: The HT870 is a hand held communications band Transceiver/navigation receiver with VOR bearing or CDI Display. This unit is self contained with its own speaker, microphone, push to talk switch and flexible antenna, or it can be connected to external headset, microphone, and antenna.
  • Page 15 13.3 Continued M-set Switch: This switch is used to activate the memory set function. When depressed the memory set function is turned on and information can be entered or changed in the 10 memory channels. In the off mode the information in the memory can not be changed. Internal/External Switch: This switch is a three position switch used to select the speaker and microphone to be used with the unit.
  • Page 16 13.3 Continued D Key followed by the A Key - by striking the Memory Key then the Scan Key the unit will scan the 10 memory channels. If a memory channel contains a frequency which the user does not want to scan it can be locked out and the unit will skip this channel in the memory scan process.

  • Page 17: Introduction To Operating Procedures

    14.1 INTRODUCTION TO OPERATING PROCEDURES The HT870 may be utilized as a 760 channel COM Transceiver or a 200 channel NAV Receiver/Converter. The unit may be operated in either the Memory or Frequency Modes.

  • Page 18: Power Turn-On And Volume Control

    14.1 Continued The Memory Mode allows for operation over 10 NAV or COM frequencies that are operator chosen and stored in memory. Frequency scanning may be either Manual or Automatic for COM frequencies but is limited to Manual only for NAV frequencies.

  • Page 19: Frequency Entry

    14.5 FREQUENCY ASSIGNMENTS TO MEMORY Ten pre-programmable COM or NAV frequencies may be stored in the HT870's memory. These memory locations are identified on the Keyboard as letters M0 through M9.
  • Page 20 14.5.1 Continued Assign a NAV or COM frequency (See Section 14.4). Press the "M-SET" switch to the ON position to enable the "#" Key. Depress the "#" Key. Confirm that the letters "MW" appear in the display. Depress that location key (M0 to M9) at which the frequency is to be stored.

  • Page 21: Recalling Frequency From Memory Location

    Confirm LCD displays "M" (memory mode). b.Depress "6" Key. Frequency and channel number are displayed in LCD. 14.6 OPERATION OF THE HT870 AS A COM TRANSCEIVER 14.6.1 FREQUENCY MODE OF OPERATION (COM CHANNELS) The Frequency Mode of Operation permits transmission and reception over any of 760 COM channels or over selected bands.

  • Page 22: Memory Mode Of Operation

    14.6.1.2 Continued 136.975 MHz into M0. The operator must re-program M0 to suit his requirements (See Section 14.5.1). After selecting the upper limit, the operator chooses the lower limit and assigns this frequency in the display. To start an UP scan, press the "A" Key. The upper limit (M0) MUST BE HIGHER than the lower limit or else you CANNOT scan.

  • Page 23: Memory Location Lockout

    14.6.2.1 MEMORY LOCATION LOCKOUT The HT870 has a memory location lockout feature that allows one or all of the locations M1 to M9 to be locked out of scanning. Location M0 cannot be locked out as this location determines the upper frequency limit of scan.
  • Page 24 14.6.2.1 Continued The following sequence illustrates the memory location lockout procedure: Depress the "D" Key to switch to the Memory Mode of Operation. Confirm that the letter "M" appears in the display. Depress a memory location key (M1 to M9) to recall the location that is to be locked out.

  • Page 25: Restoring A Locked Out Memory Location To The Scan Sequence

    5.Release M-SET switch. 6.Restore the scan direction. 14.7 VOR NAV OPERATION The HT870 is capable of giving the user both CDI and Bearing modes of operation. 14.7.1 CDI MODE In the CDI Mode the Left/Right Indicator is an 11 bar display with each bar having a 2 degree resolution.

  • Page 26: Setting The Obs

    14.7.1 Continued To enter the CDI Mode, select a valid VOR channel and press the CDI/BRG mode button on the top of the radio. At this time theLeft/Right display should appear at the bottom of the display and the OBS legend should appear in the display's upper left.

  • Page 27: Duplex Operation In Nav Mode

    14.7.2 DUPLEX OPERATION IN NAV MODE The HT870 is capable of Duplex Mode of operation when a NAV channel has been selected. This means that the unit will transmit on Flight Service Frequency 122.10 when the PTT switch is depressed, and will receive on the selected NAV frequency.

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