Potomac Instruments FIM-41 540 kHz - 5 MHz Field Intensity Meter, US $3,500.00 – Picture 0

Potomac Instruments FIM-41 540 kHz - 5 MHz Field Intensity Meter, US $3,500.00 – Picture 1

Potomac Instruments FIM-41 540 kHz - 5 MHz Field Intensity Meter, US $3,500.00 – Picture 2

Potomac Instruments FIM-41 540 kHz - 5 MHz Field Intensity Meter, US $3,500.00 – Picture 3

Potomac Instruments Fim-41 540 Khz - 5 Mhz Field Intensity Meter

US $3,500.00

Catskill, New York, United States
Feb 20th

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You are bidding on a used Potomac Instruments FIM-41 540 kHz to 5 MHz field intensity meter. The overall condition of the meter is good with a few scratches from normal use. I am selling this for my dad, a retired radio engineer. It was with an assortment of leftover equipment from a station sale. It does have a serial number but I am not listing it in order to save Potomac Instruments from phone calls. I did speak with them and they last had this unit in for service in 2005. They suggested a recalibration/refurbishment. The owner at the time declined and they sent it back. Mom and Pop radio station owners are notoriously cheap and I'm guessing they just didn't want to spend the money. It turns on, lights up, all switches appear to work, it picks various radio signals etc. I will do my best to answer any questions but the sale is final. this unit is being sold "as is". Paypal only. Thanks for looking. The information below is from the internet. Field Strength Meters FIM-22 and FIM-41 KEY FEATURES · 6-Position Attenuator, 20 dB/step · High Q Double-Tuned RF Input for Maximum Image Rejection · Multi-Pole Hybrid IF Filter (Shape Factor, 2.2:1) · Temperature Compensated and Voltage Regulated · 4-Inch, Lighted, Mirrored Scale, Taut-Band Meter · Front Panel Speaker, Headphone Jack, and Recorder Output Jack · RF Coaxial Input · Mechanical "Vernier" Tuning · Differential Circuit for Precise Calibration · Capable of Signal Ratio Measurements to -80 dB DESCRIPTION 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. SYSTEM OPERATION A simplified calibration procedure assures measurement accuracy. Frequency is easily selected and observed on an illuminated dial. Tuning the receiver simultaneously tunes the calibrating oscillator to within a few kHz of the selected frequency. A separate control is used for vernier tuning. Proper gain calibration is precisely indicated by a sharp null on the meter when the gain control is adjusted for an exact balance between the detected outputs of the receiver and the calibrating oscillator. Field strength is displayed on the meter's logarithmic scale which is calibrated in increments from 1 to 10. Full scale meter sensitivity is determined by the attenuator range switch. Signal ratio (i.e., harmonic) measurements are easily resolved using the dB scale of the meter in conjunction with the 20 dB per step range switch. FIM - 22/41 SPECIFICATIONS Frequency Range: FIM-22 FIM-41 200 kHz to 550 kHz 540 kHz to 5.0 MHz in two bands: Band "A" 0.54 MHz to 1.61 MHz Band "B" 1.58 MHz to 5.0 MHz Field Intensity Range: 10 uV per meter to 10 V per meter Accuracy of Calibration: 1%, referenced to NIST Standard field (Calibrated at 220 mV per meter) Accuracy of Range Attenuator: 2% over entire FI range and tuning band Selectivity: FIM-22 Bandwidth (6 dB) Bandwidth (60 dB) IF Rejection Image Rejection 4 kHz nominal with multi-pole hybrid filter 10 kHz maximum 70 dB minimum; 40 dB minimum at 455 kHz 60 dB minimum Selectivity: FIM-41 Bandwidth (6 dB) Bandwidth (60 dB) IF Rejection Image Rejection 7 kHz nominal with multi-pole hybrid filter 15 kHz maximum 35 dB minimum 65 dB at 540 kHz decreasing to 45 dB (minimum) at 5.0 MHz IF Frequency: 455 kHz Panel Meter: 4" mirrored scale, logarithmic graduations 1 to 10, taut band meter movement, 3% linearity Antenna: Shielded loop, integral part of hinged cover Audio Outputs: Front Panel loudspeaker, weather treated cone Headphone jack, high and low Z (disconnects speaker) Recorder Output: 0.4 to 4 Vdc proportional to field intensity for each attenuator range, source resistance 2200 ohms Lights: Frequency dial and meter; panel switch for night use Batteries: 6 required Standard 1.5 V C-Zn "D" cells or 1.5 V Alkaline cells for extended life at very low temperatures Battery Life: Greater than 1000 FI readings (reduced life with frequent use of lights and/or high speaker volume) Ambient Temperature, F (C): Continuous exposure -10 deg. (23 deg.) to 130 deg. (54 deg.); "reading time" exposures practical at lower temperatures. Dimensions. IN. (CM): Cover closed: 8.75 (22.2) H, 11.5 (29.2) W, 5.125 (13) D Cover open: 3.875 (9.8) D - (gripping width) Weight, LB (KG): 12.0 (5.5) with batteries External RF Input: FIM-22 FIM-41 200 kHz to 550 kHz, 10 uV to 10 V 540 kHz to 5.0 MHz, 10 uV to 10 V RF Input Switch: Selects loops antenna (ANT) or panel connector (EXT) Meter Switch: Selects normal linear (LIN) or logarithmic (LOG) operation Logarithmic Dynamic Range: 60 db compressed input range for FI meter and recorder input Sold as-is. No guarantee.

Condition:	Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...	Brand	Potomac Instruments
Country/Region of Manufacture	United States
Model	FIM-41