Potomac Instruments, Inc.
Potomac Instruments inc. has been designing and manufacturing precision Measurement and Control equipment intended for the international terrestrial Radio and Television broadcast industry since 1968. The company’s products include audio test instruments, antenna array monitoring systems, AM, FM and TV field strength meters, and transducer interface devices.
- 301.696.5550
- 301.696.5553
- sales@pi-usa.com
- 7311 Grove Road, Unit A1
Frederick, MD 21704-3300
United States of America
Categories
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product
Frequency Synthesizer-Detector
SD-31
The Model SD-31 Synthesizer-Detector is a high output crystal signal generator of precisely known frequency combined with a sensitive, selective detctor for RF bridge measurements of AM antenna impedance. Packaged in a single light-weight battery-powered unit, the SD031 complements bridges such as the General Radio 1606, 916, and the Delta OIB-1.
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Digital Antenna Monitors
1900 Series
There are three different units in the 1900 Series. The basic unit is the Model 1901.This 5 1/4 inch unit contains control/measurement circuitry for up to 12 towers, digital display of all measurements, local operating controls, and an interface to a remote control system. The control/measurement circuitry for each tower is contained in a separate module. The modules plug into the rearof the unit, and may be easily added to an expanding station.
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Audio Analyzer
AA-51A
The AA-51A is a multi-purpose, precision audio analyzer that helps to automate proof-of-performance measurements and equipment maintenance. Unique features of the AA-51A make it the ideal instrument for engineers, and service professionals. Excellent RFI shielding enables measurements to be made within the high-level RF environments of commercial broadcast transmitter facilities.
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Field Strength Meters
FIM-22 And FIM-41
The Models FIM-22 and FIM-41 are portable field strength meters designed to provide precise, direct measurements of electro-magnetic fields in the 200 kHz to 5.0 MHz spectrum. These units include a receiver, integral shielded loop antenna, precision attenuator, internal calibration source, and battery power supply. With calibration accuracy traceable to the National Institute of Standards and Technology, the FIM-22 and FIM-41 meet the most exacting requirements of government and industry. Their hinged covers, on the rugged drawn aluminum cases, contain a loop antenna. Opening the cover to a vertical position connects the antenna terminals to the receiver via maintenance-free gold-plated contacts. An interlock switch prevents inadvertent battery discharge when the cover is closed.
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Audio Generator
AG-51
The AG-51 Audio Generator contains a low distortion 20 Hz to 200 kHz sine wave generator, an SMPTE standard intermodulation signal generator and a fixed frequency sine wave generator at 3.15 kHz for wow and flutter tests. Signal outputs are simultaneously available at levels of up to +20 dBm (equivalent sine wave power for complex signals) at separate left (L OUT) and right (R OUT) output connectors. Outputs may be selected for left (L) only, right (R) only, left and right in phase (L+R), and left and right in phase opposition (L-R). Fully balanced or unbalanced outputs at impedance levels 150 ohms or 600 ohms are front panel selectable. Three precision attenuators (10, 1.0 and 0.1 dB) provide a dynamic range of 99.9 dB in 0.1 dB steps. Attenuator dials display the output level directly in dBm in the 150 ohm source impedance configuration. Automatic output leveling circuitry with a built-in self-test feature provides a constant output level thereby eliminating the need for output metering. In the TEST mode the generator output level is reduced to zero, a useful feature during noise measurements.
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Noise Control And Acoustical Consulting Services
Our acoustical consultants use the latest and most advanced noise prediction and modeling software, precision sound measurement equipment and detailed acoustical analysis that enable us to help our clients achieve their project's noise requirements and goals. Contact us before your noise challenges become noise pollution problems.
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Field Strength Meter
FIM-71 VHF
The Model FIM-71 is a portable, laboratory quality Field Strength Meter designed for rigorous field applications. Combining a calibrated half-wave dipole antenna and a highly accurate tuned voltmeter with a range of 140 dB, the FIM-71 is suitable for practically all types of RF emission measurements in the 45 MHz to 225 MHz spectrum. The operator can switch select wide or narrow bandwidth, peak or average value of TV or pulse modulated signals, AM or FM demodulation, and a meter dynamic range of either 20 dB or 60 dB. A dc analog output voltage, proportional to the meter indication, is provided for driving a chart recorder. A leveled output from the calibrating oscillator is available for measuring cable insertion loss, filter response, amplifier gain, and other signal ratio measurements. The 4-1/2 inch, taut band, mirrored scale meter is calibrated in volts and dB for precise measurements in field or laboratory environments.
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Tower Light Monitor
1750-TLM
Designed with the Broadcaster in mind the 1750-TLM provides built in flexibility to simplify even the most complicated installations. It can even alarm for single bulb failures on towers with Beacons and Obstruction lights on a single circuit. Status oututs eliminate the worry of operator interpretation and provide definitive Good-Bad indications for the operator and your logging equipment. Don’t let tower light failures expose you to increased liability, the 1750-TLM is compatible with most existing control equipment and may well provide your best return on investment this year!
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Field Strength Meter
FIM-72A UHF
The Model FIM-72A is a portable, laboratory quality Field Strength Meter designed for rigorous field applications. Combining a calibrated half-wave dipole antenna and a highly accurate tuned voltmeter with a range of 140 dB, the FIM-72A is suitable for practically all types of RF emission measurements in the 450 MHz to 960 MHz spectrum. The operator can switch select wide or narrow bandwidth, peak or average value of TV or pulse modulated signals, AM or FM demodulation, and meter dynamic range of either 20 dB or 60 dB. A dc analog voltage, proportional to meter indication, is provided for driving a chart recorder or similar device. A leveled output from the calibrating generator is available for measuring cable insertion loss, filter response, amplifier gain, VSWR, and other signal ratio measurements. The 4-1/2 inch, taut band, mirrored scale meter is calibrated in volts and dB for precise measurements in field or laboratory environments.
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Medium Wave Field Strength Meter, 520 kHz to 5.1 MHz
PI 4100
The PI-4100 was designed to become the successor to the industry standard FIM- 41 and to provide the accuracy and reliability that the international engineering community, government regulators, and broadcast licensees have depended on for more than a generation.
