Narco Avionics HT870 Operator'S Manual Download | Manualshive

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13.1

DESCRIPTION AND LOCATION OF CONTROLS

Figure 13-1

HT870 CONTROL FUNCTIONS

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Summary of Contents for HT870

Page 1: ...NARCO HT870 HANDHELD NAV COM 960 CHANNELS...

Page 2: ...PANEL DESCRIPTION 10 13 2 16 KEY KEYBOARD DESCRIPTION 10 13 3 PRODUCT DESCRIPTION HT870 11 14 1 INTRODUCTION TO OPERATING PROCEDURES 14 14 2 POWER TURN ON AND VOLUME CONTROL 15 14 3 SQUELCH CONTROL OP...

Page 3: ...ii LIST OF ILLUSTRATIONS 13 1 HT870 CONTROL FUNCTIONS 9 13 2 MIC CONNECTOR PIN ASSIGNMENT 10 13 3 16 KEY KEYBOARD 10...

Page 4: ...ed 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 ba...

Page 5: ...cy range NAV 108 00 to 117 95 MHz COM 118 00 to 136 975 MHz Audio output 0 5 watts into 8 ohms speaker 30 milliwatts into 600 ohms headphones Receiver sensitivity 1 5 microvolts max for 6 dB S N N Ima...

Page 6: ...Part No 03125 0621 5 3 HT870 OPTIONAL ACCESSORIES The following list comprises the available accessories for the HT870 ITEM ORDER NUMBER DESCRIPTION 1 50900 0002 Nonrechargeable alkaline battery pack...

Page 7: ...connector This connector is used when the owner wishes to design and fabricate his own interface adapter cable see item 8 6 1 HT870 MAINTENANCE INFORMATION The HT870 is not field repairable Should a...

Page 8: ...used as an aircraft transceiver the Federal Communications Commission requires that FCC Form 404 titled Application for Aircraft Radio Station License be submitted prior to operation If the HT870 is t...

Page 9: ...by a sharp 60 drop in capacity during the next 10 15 minutes of operation This memory effect is caused by repeatedly charging the batteries when they have been only slightly discharged This is a temp...

Page 10: ...RY PACK TO PRESERVE MEMORY If a battery pack that needs recharging is being replaced by a second fully charged pack the exchange must be completed within 30 seconds Failure to do so will result in the...

Page 11: ...n aircraft VOR antenna may be used however it is not recommended that HT870 COM transmissions be made while using a VOR antenna 12 1 CAUTIONS TO OPERATORS Ensure that the battery pack is properly char...

Page 12: ...9 13 1 DESCRIPTION AND LOCATION OF CONTROLS Figure 13 1 HT870 CONTROL FUNCTIONS...

Page 13: ...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 The letters M0 M9 define 10 memory...

Page 14: ...e as follows 1 Antenna Connector This is a standard BNC connector which connects to the flexible antenna supplied with the unit or can be connected to an external antenna through RG58 or suitable coax...

Page 15: ...e supplied through the optional Headphone Microphone Adapter NOTE In all positions of the Internal External switch the PTT switch on the side of the unit is active and can be used to execute a transmi...

Page 16: ...To set the OBS to the TO radial of the VOR station you are receiving strike the B key At this time the OBS display will blank and the TO FR flag will display the condition that had existed prior to st...

Page 17: ...the operation and keep his original frequency all that is necessary is to strike the set key when the frequency display is blank 12 Keyboard Lock Switch This switch is used to lock out inadvertent key...

Page 18: ...of memory locations M0 to M9 2 The Lock Key on the side of the unit above PTT key locks out the 16 Keypad functions and must be in the unlocked condition to use any Keypad function If the Key Lock is...

Page 19: ...digit entry format should be used for frequency Frequency entries can be cleared if a mistake is made by striking the C Key The frequency entry sequence can be terminated by striking the C Key while...

Page 20: ...ion key is depressed that the letters MW change to M memory mode and that a numeral corresponding to the location number appears in the smaller display 6 Depress D Key M disappears from the LCD to tak...

Page 21: ...QUENCY OPERATION If it is required only to receive and transmit over a single channel then follow this procedure 1 Turn the radio ON and set the Volume control to the position 2 Push the M SET and LOC...

Page 22: ...uence Location M0 cannot be locked out 4 PCS Priority Channel Scanning This feature is restricted to the SCAN scanning mode and in addition only when the radio is in the Memory Mode of Operation The S...

Page 23: ...R Radial accuracy reliable lock on in the scanning modes was sacrificed Reliable lock on to NAV frequencies is achieved by pressing the memory location key of the desired NAV channel which stops the s...

Page 24: ...l is present in the display 3 Engage M SET switch down 4 Depress the B Key When the key is depressed the channel is locked out Confirm the presence of the letter L lockout next to the channel number i...

Page 25: ...from the display signifying the return of this channel to the scanning 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...

Page 26: ...Flag is being displayed striking the B Key again will cause the TO Flag to display and by striking the set key the OBS will be set to the TO Radial of the VOR 2 Auto FR This is accomplished as explai...

Page 27: ...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 Note Since the rece...

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