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Field Strength Meters
PI 4100 Covers 520 kHz to 5.1 MHz frequency spectrum, $ 14,975.00
PI 4100 (Special Tuning) Covers 200 kHz to 5.1 Mhz frequency spectrum $ 15,475.00

Field Strength Meter Accessories

1440 Hard Case for PI 4100 meter

AC-4100 117/230 VAC Charging supply for PI 4100


$ 70.00

EPG-1068NiMH Battery Pack for PI 4100 $ 75.00
LM10540 Battery tray for PI 4100 allows use with single use AA batteries $ 15.00
LM10541 Charging Cable for Vehicle use (Cigarette Lighter cord) $ 25.00
LM10529 Die Cut Foam Set for Pelican 1610 (fits PI 4100) $ 80.00
HS-11 Headset for all models $ 40.00
SOFT CASE Padded Soft Carrying Case for FIM series meters $ 210.00
  Made of 400 denier Pack Cloth. Suitable for all Potomac Field Intensity Meters. (Please specify meter to be carried.)  
UNIPOD Telescoping stand for all models. $ 145.00
ANT-71 Calibrated VHF Dipole Antennna (spare) for FIM 71 $ 2,075.00
  Replacement Antenna Element (AE-71) for ANT-71 $ 50.00
ANT-72 Calibrated UHF Dipole Antenna (spare) for FIM-72A $ 2,795.00
AC-72 117/230 VAC Adaptor for FIM-71, FIM-72 "Special Order Item"
RO-71 Phone plug $ 210.00
  with internal potentiometer for adjustable record output for all models.  
Test Cables for use with FIM-71 and FIM-72A
B20145-4 44 in. Coax Test Cable, RG-223 $ 75.00
B21045-5 34 ft. Coax Test Cable, RG-223 $ 165.00
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Tower Light Monitor
1750 TLM Tower Light Monitor: $ 940.00
  4 Channel "Stand-alone" module for Tower Light Monitoring applications. It is supplied in an aluminium chassis with an AC power supply. (Not compatible with the 1701-UC chassis.) Requires a current sample input from each measured circuit. (Torroid transformer Mdl 12525 recommended.)
Torroid Sample Transformer (Mdl 12525) $ 85.00
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Antenna Monitors
1900 Series - FCC ID: IJ3PI1900

When compared to previous generation equipment, the 1900 series Antenna Monitors provide better performance over a wider dynamic range with virtually no modulation effects. Separate measuring circuits are employed for each tower. Remote control interfacing is greatly simplified because these monitors provide simultaneous outputs for the measured Phase Angle and sample Current Ratio of each tower. Therefore, it is not necessary for the remote control system to select a specific tower prior to interrogating a particular telemetry output port. To facilitate maintenance and system reconfiguration, all active circuits are packaged on plug-in printed card modules which are accessible at the rear panel of the monitor. 1900 series Antenna Monitor metering capacity (number of towers) may be increased or decreased by adding or removing individual metering modules.
1901 Antenna Monitor (Two Towers, 1 to 3 Patterns) $ 11,330.00
  Monitor unit with front panel display, local operating controls, and complete interface capability to remote control systems.  
1902 Monitor Display $ 2,950.00
  Display Unit for extension manual control and reading of the 1901 or 1903 Monitors (1-3/4" Panel Height)  
1903 Antenna Monitor (Two Towers, 1 to 3 Patterns) $ 9,560.00
  Monitor unit with no display or controls, for control from a Type 1902 Monitor Display, with complete remote control interface.  
1910 Tower Inputs Metering Board $ 1,570.00
  (1 ea Required for each tower) Circuit Card for one Tower input. Provides full metering support and outputs for Phase Ratio and Amplitude for one Tower.  

Basic Configurations
of Towers
1901 1903 W/1902
2 $ 11,330.00 $ 12,290.00
3 $ 12,900.00 $ 13,860.00
4 $ 14,470.00 $ 15,430.00
5 $ 16,040.00 $ 17.000.00
6 $ 17,610.00 $ 18,570.00
7 $ 19,180.00 $ 20,140.00
8 $ 20,750.00 $ 21,710.00
9 $ 22,320.00 $ 23,280.00
10 $ 23,890.00 $ 24,850.00
11 $ 25,460.00 $ 26,420.00
12 $ 27,030.00 $ 27,990.00

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Ordering Instructions

A 1901 or 1903 Antenna Monitor consists of a chassis with power supplies and a control board which can support up to (l2)Type 1910 Tower Input Metering Boards. The basic unit is supplied with two (2) 1910 Boards. A four tower array would require two additional l910 Boards for a total of four l9l0 Tower Inputs. Potomac Instruments will configure a 1900 series monitor and conduct it's final tests at the station frequency if the following information is specified at the time of the order:

   Number of Towers (2-12) ________ Twrs.
   Number of Patterns (1-3) ________ Pats.
   Non-Directional Patterns   ________ Y / N
   Reference Tower for each Pattern   ________ D/N/3rd
   Operating Frequency   ________ kHz
   Sampling Line Impedance (50 or 75 ohms) ________ ohms
   Input Connector Type (UHF or N) ________  
   AC Power (117, 230, or 245 VAC) ________ VAC
   AC Frequency 50 or 60 Hz ________ Hz

Special Applications
To the extent feasible 1900 series antenna monitors can be manufactured for low signal levels or may incorporate custom filters for applications involving interference derived from a nearby transmitter facility or from diplexing more than one frequency onto a single antenna system. Filters are custom designed, manufactured and certified for each specific application and are thus considered to be "Custom Engineering Projects." Potomac Instruments will design, manufacture, and test the filter performance in the specific Antenna Monitor. Potomac will also certify that the Antenna Monitor meets or exceeds its original FCC Type Approval specifications and maintain full records of each system for service and technical support. In all cases Potomac Instruments will need to carefully define the design parameters of such filters. Accordingly, sampling system design and the specifics of the Desired to Undesired (D/U) signals that appear at the, properly terminated, RF input connectors of the antenna monitor must be understood. If the diplexed or interfering signals are already present on the antenna the data necessary for Potomac to proceed with a design can be obtained by using a Potomac Instruments' FIM-41 or FIM-21 to measure the relative amplitude of the desired signal and each of the undesired signals from the sampling system. Potomac will supply detailed instructions to assist in this process or the station can utilize a consulting engineer to prepare the necessary data.

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R.F. Generator
SD-31 High output R.F. Frequency Synthesizer:
covering 100 kHz to 1999.5 kHz in 500 Hz steps
$ 7,950.00

SD-31 Accessories
RX-31 Companion receiver for SD-31:
for use in making R.F. bridge measurements
$ 2,355.00
FL-31 Two Pole Tuneable Filter
Useful in any AM application requiring selective tuning. Fused with Continuous Tuning over AM band, mounted in a shielded Cast Aluminum Enclosure
"Special Order Item"
HS-11 Headset $ 40.00
C30042 Detector Cable, SD-31 to FIM-41 $ 160.00
TEST CABLE RG223 Double Shielded Coaxial Cable:
five foot length with BNC male connectors on both ends
$ 85.00
SOFT CASE Padded Soft Carrying Case
Made of 400 Denier Pack Cloth
$ 210.00


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