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Potomac Instruments 1900 Series User Manual

Digital antenna monitors
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1900 Series Digital Antenna Monitors
Potomac Instruments, Inc.
7309 Grove Rd Unit D
Frederick, Maryland 21704
Tel 301-696-5550
Fax 301-696-5553
Web Site: http://www.PI-USA.com
User's Guide
February 1, 2010
File: 1900 Users Guide A-SS

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  • Page 1 1900 Series Digital Antenna Monitors User's Guide February 1, 2010 File: 1900 Users Guide A-SS Potomac Instruments, Inc. 7309 Grove Rd Unit D Frederick, Maryland 21704 Tel 301-696-5550 Fax 301-696-5553 Web Site: http://www.PI-USA.com...

  • Page 2: Table Of Contents

    Potomac Instruments, Inc. 1900 Series User's Guide Revised 020100 Table of Contents MODEL 1900-SERIES INTRODUCTION....................1 INSTALLATION............................. 4 2.1 U ..............................4 NPACKING 2.2 R ..........................4 ESHIPMENT TO ACTORY 2.3 I ............................... 4 NSTALLATION 2.4 C ........................5 ONFIGURATION ERIFICATION 2.5 C...
  • Page 3 Figure 9. Front Panel Display Board Jumper Locations .................21 Figure 10. Model 1920 Control Board Jumper and Adjustment Locations ..........22 List of Tables Table 1. 1900 Series Equipment Specifications..................3 Table 2. 1902 Interconnect Cable Size and Length Requirements ............10 Table 3. Model 1910 Module Configurations ..................20 Table 4.

  • Page 4: Model 1900-Series Introduction

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Model 1900-Series Introduction The Model 1901 and 1903 Antenna Monitors, and the Model 1902 Monitor Display are designed to monitor the relative phase angles and current ratios of antenna element currents for AM broadcast directional antennas with up to 12 towers.
  • Page 5 Technical Manual Revised 020100 The 1900 Series products mount in standard EIA/RETMA equipment racks and cabinets. The Model 1901 and 1903 front panels are 5.25 inches (3-ru) high and the Model 1902 is 1.75 inches (1-ru) high. The units are set at the factory to operate on either 115 VAC or 230 VAC power. Units set for 230 VAC operation include a sticker on the power supply indicating the 230 VAC requirement.

  • Page 6: Table 1. 1900 Series Equipment Specifications

    16.9-inch (43 cm) rear panel width. AC Power: 117 VAC ±10%, or 234 VAC ± 10%, 50-60 Hz, 50 VA maximum for 115 VAC operation: MDL 3/4 AC Mains Fuse for 230 VAC operation: MDL 3/8 Table 1. 1900 Series Equipment Specifications...

  • Page 7: Installation

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 INSTALLATION Unpacking The monitor is packed in a custom shipping carton. Inspect the carton for any signs of serious damage. Report any damage to the shipping company. Carefully remove the Monitor from the shipping carton. A technical manual and power cord are also included in the carton.

  • Page 8: Configuration Verification

    Section 4. The following paragraphs provide detailed verification information. AC Mains Power. All 1900 Series units are internally configured at the factory to operate from either 115 VAC or 230 VAC mains power. Soldered jumpers and voltage-specific MOV surge protectors determine the input voltage requirements.

  • Page 9: Figure 4. Model 1901/1903 Rear Panel Connections

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Figure 4. Model 1901/1903 Rear Panel Connections...

  • Page 10: Connecting Rf Current Sample Inputs

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Connecting RF Current Sample Inputs Each Model 1910 Metering Module includes a Type-N or UHF (PL-259) coaxial connector RF input. It is recommended that the sample cables from the antenna towers be marked with their respective tower numbers.

  • Page 11: Connecting External Control Inputs And Telemetering Outputs

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Connecting External Control Inputs and Telemetering Outputs Figure 4, on page 6, illustrates the rear panel connections for the Model 1901 and 1903 Antenna Monitors. 2.6.1 External Control Inputs The external control inputs allow remote or automatic function selection similar to the manual selections that can be made from the front panel.

  • Page 13: Ac Power Supply

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Shielded data cable is recommended for connecting a 1902 Display unit to a 1901 or 1903. For short lengths the type of cable is not critical. For longer lengths, low-capacitance, twisted-pair cable with high insulation resistance is required.

  • Page 14: Operation

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 OPERATION Overview Ratio, amplitude, and phase are displayed on the 1901 Monitor or the 1902 Display/Control for one tower at a time. Towers are selected for display as required. When using the 1902 with the 1901, the same display of tower number, ratio, and phase appears on the panels of both units, and tower selection can be done at any time at either panel.

  • Page 15: Mode Select Switch

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 3.3.2 MODE Select Switch The MODE select switch steps the Monitor display through three operational modes, RATIO, AMPL, and TEST, as indicated by LED "bullets" on the display. RATIO Mode. In RATIO mode, the display shows the ratio of the selected tower sample voltage to that of the reference tower.

  • Page 16: Front Panel Displays

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Front Panel DISPLAYS 3.4.1 RATIO The ratio of the selected tower sample voltage to that of the reference tower is displayed directly, up to a maximum of 1.999. Because the indicating device is a 3-1/2 digit voltmeter there is a ±1 digit possible variation in the reading.
  • Page 17 Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 When comparing phase readings with those of other Monitors, note that differences of 0.5 degree are within the probable accuracy of most Monitors, and a greater difference is allowed by published accuracy specifications. When the same phase difference is read on the various inputs of a Model 1901, the measurements should agree within 0.3 degree, but may differ more...

  • Page 18: Adjustments, Maintenance, And Configuration

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 ADJUSTMENTS, MAINTENANCE, and CONFIGURATION The following adjustments, accessible without removing the Model 1901 or 1903 from its rack, need to be checked whenever a Model 1910 Metering Module is replaced in the field. Otherwise, only occasional checks of the PHASE and RATIO adjustments are suggested.

  • Page 19: 1910 Metering Module Ratio Adjustment

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 4.1.3 1910 Metering Module RATIO Adjustment To adjust the ratio for each tower, use the MODE switch to select TEST. For each tower, except the one used as reference (normally the DAY reference tower), adjust the potentiometer for a ratio reading of 1.000.

  • Page 20: 1910 Metering Module Replacement

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 4.1.4 1910 Metering Module Replacement When replacing a 1910 Metering Module the jumper plug(s) must first be installed on the new module exactly as they are installed on the module to be replaced. All modules have one plug on JP2 or JP3 on the pin pair corresponding to the tower number, which is usually the same as the number of the tower being monitored.

  • Page 21: Changing Reference Tower Assignments

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 When replacing a 1910 module, it can be set by connecting another sampling line and adjusting for the same phase reading as was just obtained for that line on another module. If there are separate reference towers for DAY and NIGHT, a compromise adjustment for each non- reference tower that minimizes the zero error is used.
  • Page 22 Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Step 2 From Table 3, select the desired new Monitor configuration. In Table 4, copy the reference assignments for the selected new configuration into the REF–NEW row for positions A thru D.

  • Page 23: Table 3. Model 1910 Module Configurations

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 1910 Module Position → → → → DA-1 DA-2 Directional Antenna → → → → 1901 Monitor Configuration DA-3 RDN3 RD = Day Reference RN = Night Reference R3 = 3RD Refernce...

  • Page 24: 1920 Control Module

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 1920 Control Module 4.2.1 1920 AMPLITUDE Adjustment Open the Monitor's front panel to access the adjustment potentiometers. Figure 7 on page 16 shows the adjustment locations. The three potentiometers marked DAY, NIGHT, and 3RD, are adjusted in the AMPL mode to set the amplitude scale factor.

  • Page 25: Figure 10. Model 1920 Control Board Jumper And Adjustment Locations

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Module 1920 JP1 Mode PATT Switch Effects Contact Closure Effects* and JP8 Positions JP1, 1 Toggles between Local Day / Disabled JP8, 2 Local Night JP1, 1 Toggles between Local Day /...

  • Page 26: Calibration Requirements

    Any instrument which is found within one year not be meet the foregoing standards after examination by our factory, will be repaired or at the option of Potomac Instruments replaced without charge. This warranty does not apply to equipment which has been altered, improperly handled, or damaged in any way.

  • Page 27: Tower Readings Are Unreliable Or Incorrect

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 If any of the voltages are significantly higher than the specified voltage the power supply should be checked and/or replaced. Significantly higher voltages may also have damaged other components within the unit. Under these conditions the entire assembly should be returned to the factory for repair.
  • Page 28 Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 If a metering module is found to have a problem with incorrect or inconsistent readings, it is possible that the terminating resistor R101 has become damaged. R101 can be checked with an Ohm meter by checking the resistance from the RF input of the module, to the chassis.

  • Page 29: Factory Contact Information

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Factory Contact Information By Postal Mail Potomac Instruments, Inc. 7309 Grove Rd Unit D Frederick, Maryland 21704 By Telephone or Fax Tel. 1-301-696-5550 1-301-696-5553 Country Code 1, North American Area Code 301...

  • Page 30: Notes

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 NOTES...
  • Page 31 Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 NOTES...
  • Page 32 Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 NOTES...
  • Page 33 Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 NOTES...

  • Page 34: Appendix A - Sample Configuration For Model 1901/1903 Monitors

    Potomac Instruments, Inc. 1900 Series Technical Manual Revised 020100 Appendix A - Sample Configuration for Model 1901/1903 Monitors...
  • Page 35 Potomac Instruments, Inc. 1900 Series Antenna Monitor Factory Configuration General Information Rev A Customer / Order Number Date Model Number Chassis Serial Number 1901 1903 1902 Included Number of Towers Number of Patterns Non-Directional Patterns Reference Tower for each Pattern...
  • Page 36 Potomac Instruments, Inc. 1910 Metering Module Configurations Rev A 1910 Serial Number 1910 Serial Number 1910 Serial Number Slot A Slot B Slot C REF DAY REF DAY REF DAY Non-D Non-D Non-D OPEN SHORTED OPEN SHORTED OPEN SHORTED OPEN...
  • Page 37 Potomac Instruments, Inc. 1900 Series Locator Information...

  • Page 38: Appendix B - Return Material Authorization Form

    Potomac Instruments, Inc. Appendix B - Return Material Authorization Form...
  • Page 39 Potomac Instruments, Inc. Potomac Instruments, Inc. Return Material Authorization 7309 Grove Rd Unit D Frederick, MD 21704 RMA # Issued: Tel 1-301-696-5550 Fax 1-301-696-5553 Internet http://www.pi-usa.com Information Request Equipment Information Model Number Serial Number Warranty Claim Primary and Alternate Customer Contacts...

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