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1792 VHF Radio

User's Manual

5. SPECIFICATIONS

Parameter

Specification

Frequency Range

117.975 to 138.000 MHz

Channel Spacing

25 kHz

Duty Cycle

20%

Transmitter Power Output

5 to 10 W

Output Power Stability

1.1 W

VSWR

4:1

Carrier Stability (-40 to +55ºC)

±1.000 Hz max

Incidental FM and PM from Modulation

±100 Hz max

Rise Time to 90% Rated Power

100 ms max

Audio Input

50 mV to 2 V rms

Speech Processor Dynamic Range

35 dB min

Modulation Capability

up to 95%

Audio Distortion (90% modulation)

10% max

Audio Frequency Response

300 Hz to 2500 Hz (+1, -3 dB)

Spurious Emissions

60 dB below carrier

Hum and Noise Level

45 dB below carrier

Voice/Keying Connector

DB9 (female 9-pin D-sub connector)

Antenna Connector

RG58

Power Supply Connector

4-pin CPC

Supply Voltage

11–15 V DC

Current Consumption

Transmit Mode — 5.0 A max

Standby — 1.5 A max

Operating Temperature

-40 to +131ºF

(-40 to +55ºC)

Storage Temperature

-67 to +149ºF

(-55 to +65ºC)

Humidity

up to 100% noncondensing

Enclosure

powder-coated aluminum

Dimensions

8.50" W × 2.75" H × 10.25" D

(216 mm × 70 mm × 260 mm)

Weight

3.5 lb (1.6 kg)

Shipping Weight

5 lb (2.3 kg)

Summary of Contents for 1792

Page 1: ...All Weather Inc 1165 National Drive Sacramento CA 95834 USA 800 824 5873 www allweatherinc com User s Manual Rev B Model1792 VHFRadio FAA APPROVED ECP202 2014 Dec 30 NOT FAA APPROVED ...

Page 2: ...owner and with no intention of infringement All Weather Inc and the All Weather Inc logo are trademarks of All Weather Inc Disclaimer The information and specifications described in this manual are subject to change without notice Latest Manual Version For the latest version of this manual see the User Manuals page on our web site at http www allweatherinc com support support library user manuals ...

Page 3: ...ounting Bracket 7 2 3 Calibration 8 2 4 Connections 8 2 5 Operational Check 9 3 OPERATING INSTRUCTIONS 10 3 1 Switches Controls and Indicators 10 3 2 Operating Instructions 11 3 2 1 Switching VHF Radio OFF 11 4 MAINTENANCE 12 4 1 Periodic Maintenance 12 4 1 1 Monthly Maintenance 12 4 1 2 Triannual Maintenance 12 4 1 3 Annual Revalidation 12 4 2 Voice Output Static Reduction 17 4 3 Fuse Replacement...

Page 4: ...lloy bracket is used to mount the Model 1792 VHF Radio in the AWOS 3000 CDP rack Power Input Cable Assembly A 12 30 cm two core cable terminated at one end by a two pin female contacts connector mates with the two pin male contacts power connector at the back of the Model 1792 VHF Radio The cable provides DC power from the AWOS CDP rack VHF Radio Signal Cable Assembly A 36 90 cm cable terminated a...

Page 5: ...umpers inside the radio enclosure 2 1 1 Remove the Bottom Enclosure Cover To access the frequency setting jumpers you must first remove the bottom enclosure cover 1 Remove and set aside the 13 screws securing the bottom enclosure cover to the radio chassis 2 Lift the cover clear of the chassis to expose the internal view of the radio as shown in Figure 1 Figure 1 Model 1792 Internal View ...

Page 6: ...ogrammed over the frequency range from 117 975 MHz to 138 000 MHz with a 25 kHz channel spacing 1 Determine the operating frequency to be programmed Jumpers on the Single Channel Memory Set Board Figure 2 are used to set the frequency based on its MHz and kHz components Figure 2 Frequency Set Jumpers ...

Page 7: ...ettings Operating Frequency MHz Jumper Location 20 MHz 10 MHz 8 MHz 4 MHz 2 MHz 1 MHz 117 0 1 0 1 1 1 118 1 1 1 0 0 0 119 0 1 1 0 0 1 120 1 0 0 0 0 0 121 1 0 0 0 0 1 122 1 0 0 0 1 0 123 1 0 0 0 1 1 124 1 0 0 1 0 0 125 1 0 0 1 0 1 126 1 0 0 1 1 0 127 1 0 0 1 1 1 128 1 0 1 0 0 0 129 1 0 1 0 0 1 130 1 1 0 0 0 0 131 1 1 0 0 0 1 132 1 1 0 0 1 0 133 1 1 0 0 0 1 134 1 1 0 1 0 0 135 1 1 0 1 0 1 136 1 1 0 ...

Page 8: ...800 kHz 400 kHz 200 kHz 100 kHz 50 kHz 25 kHz 000 0 0 0 0 0 0 025 0 0 0 0 0 1 050 0 0 0 0 1 0 075 0 0 0 0 1 1 100 0 0 0 1 0 0 125 0 0 0 1 0 1 150 0 0 0 1 1 0 175 0 0 0 1 1 1 200 0 0 1 0 0 0 225 0 0 1 0 0 1 250 0 0 1 0 1 0 275 0 0 1 0 1 1 300 0 0 1 1 0 0 325 0 0 1 1 0 1 350 0 0 1 1 1 0 375 0 0 1 1 1 1 400 0 1 0 0 0 0 425 0 1 0 0 0 1 450 0 1 0 0 1 0 475 0 1 0 0 1 1 500 0 1 0 1 0 0 525 0 1 0 1 0 1 55...

Page 9: ...0 kHz 400 kHz 200 kHz 100 kHz 50 kHz 25 kHz 825 1 0 1 1 0 1 850 1 0 0 0 1 0 875 1 0 0 0 1 1 900 1 0 0 1 0 0 925 1 0 0 0 0 1 950 1 0 0 0 1 0 975 1 0 0 0 1 1 Figure 3 shows an example of the jumper setting for a frequency of 123 175 MHz Figure 3 Jumper Settings for 123 175 MHz ...

Page 10: ...ottom side of the sliding top shelf using the mounting bracket with the control knobs facing to the right when the VHF radio is viewed from the front end of the CDP rack Figure 4 CDP Bottom Shelf Components The mounting bracket and the VHF radio are installed at the factory Should the need arise to remove the radio undo the wing screws on either side of the radio Because of the tight space inside ...

Page 11: ... to existing connectors in the CDP rack as shown in Figure 6 Follow these steps 1 Ensure that the VHF radio s POWER ON OFF switch is set to OFF 2 Connect the M491852 00 antenna cable from the VHF RG58 connector on the back side of the CDP rear panel to the RG58 antenna connector at the back of the VHF radio 3 Connect the M491844 00 signal cable s DB9 connector to the DB9 connector on the side of t...

Page 12: ...l 9 Figure 6 VHF Radio Connections 2 5 OPERATIONAL CHECK Ensure that the VHF radio operates as described in the operating instructions in Chapter 3 Section 4 2 describes how to reduce the static if it is evident in the broadcast ...

Page 13: ... DESCRIPTION POWER ON OFF SWITCH A two position toggle switch controls the application of the power supply to the VHF radio Position 1 toggle UP the VHF radio is switched ON Position 0 toggle DOWN the VHF radio is switched OFF POWER ON LED INDICATOR A green LED is ON when the POWER ON OFF switch is set to Position 1 and power is applied to the VHF radio FUSE A 5 A fuse which protects the power sup...

Page 14: ... in the fully counter clockwise position MIC PTT CONNECTOR The MIC PTT connector below the unlabeled volume control is not used SPEAKER HEADPHONE CONNECTOR The speaker headphone connector next to the MIC PTT connector is not used 3 2 OPERATING INSTRUCTIONS 1 Ensure that the signal and antenna cables are connected 2 Set the POWER ON OFF switch to ON 3 Verify that the POWER ON green LED is ON 4 Veri...

Page 15: ...tenance Triannual maintenance of the VHF radio is identical to that specified in the monthly maintenance procedure 4 1 3 Annual Revalidation The following list gives the test equipment required during annual revalidation Radio Test Equipment Power Meter Bird Watt Meter Model 43 or equivalent Forward Reflected Power Tester Bird Watt Meter Model 43 w 10C elements or equivalent Frequency Meter Aerofl...

Page 16: ...o the RG58 connector on the front end of the CDP rear panel VSWR at transmitter If RF cables must be disconnected when switching between power level and VSWR tests turn the radio off using the switch on the radio s front panel 1 Disconnect the M491852 00 antenna cable from the back of the VHF radio 2 Connect a VSWR or forward reflected power tester to the antenna connector on the back of the VHF r...

Page 17: ...isconnected when switching between frequency and modulation tests turn the radio off using the switch on the radio s front panel 1 Log the assigned frequency on the Annual Technical Performance Record 2 Connect a frequency meter to the antenna connector on the back of the VHF radio 3 The radio transmits for approximately 30 seconds followed by an off time of five seconds While the radio is transmi...

Page 18: ...ty Key CD You will be able to access the menus once the optical drive light stops blinking indicating that the AWOS Security Key CD has been read 2 Connect a modulation meter to the antenna connector on the back of the VHF radio Set the modulation meter to the instantaneous mode 3 Access the Edit Configuration Voice tab on the CDP display and click the 300 Hz tone option in the Test panel CAUTION ...

Page 19: ...tentiometer 5 Use the VHF adjustment potentiometer R29 on the CDP peripheral interface board to lower the signal level until the modulation decreases to 80 Figure 10 VHF Adjustment Potentiometer on CDP Peripheral Interface Board 6 Use the modulation adjustment potentiometer on the VHF radio to adjust the modulation depth to 60 7 Set the modulation meter to the peak hold mode ...

Page 20: ...nce Record 14 Turn the VHF radio off using the front panel switch Disconnect the test equipment and cables and reconnect the M491852 00 antenna cable Turn the radio on 15 Remove the CD Key from the CDP optical drive 4 2 VOICE OUTPUT STATIC REDUCTION The Model 1792 VHF Radio has been adjusted for use with the AWOS 3000 to minimize audible static on the voice transmission The following steps describ...

Page 21: ...bility up to 95 Audio Distortion 90 modulation 10 max Audio Frequency Response 300 Hz to 2500 Hz 1 3 dB Spurious Emissions 60 dB below carrier Hum and Noise Level 45 dB below carrier Voice Keying Connector DB9 female 9 pin D sub connector Antenna Connector RG58 Power Supply Connector 4 pin CPC Supply Voltage 11 15 V DC Current Consumption Transmit Mode 5 0 A max Standby 1 5 A max Operating Tempera...

Page 22: ...ted Measured Pass Y N Perform the following at the VHF radio Output Power Level 2 5 W 1 W ________________ _____ Reflected Power ________________ _____ VSWR Initial 2 0 1 max Operating 3 0 1 max ________________ _____ Frequency assigned 1 0 kHz ________________ ________________ _____ Modulation 65 95 ________________ _____ Perform the following at the VHF antenna when cable runs are longer than 50...

Page 23: ... pany determines the part to be defective in material or workmanship the Company shall prepay the cost of shipping the repaired instrument to the claimant Under no circumstances will the Company reimburse claimant for cost incurred in removing and or reinstalling replacement parts c This warranty shall not apply to any Company products which have been subjected to misuse negligence or accident d T...

Page 24: ...All Weather Inc 1165 National Drive Sacramento CA 95818 1792 001 Fax 916 928 1165 Revision B Phone 916 928 1000 August 2011 Toll Free 800 824 5873 ...

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