Field Report: Potomac FIM-4100

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The display clearly shows instrument status and signal information.

The display clearly shows instrument status and signal information.

The unit includes a spectrum analyzer, which is accessed by pressing the mode switch. I have yet to really use this function except to check for second and third harmonic intensity graphically.

I can now take readings in less than half the time, and more importantly, they are more accurate. I am able to come back to the shop and edit the readings to a presentable form. One shortcoming is that I still must know the typical and maximum reading established in the license of any particular point or null. Having these stored with the station preset would help save some time.

I had a small problem with the two rubber covers on the back of the meter that cover the external antenna and USB, headphone and external power connectors. They do not stay in place.

The rechargeable battery lasts all day, and Potomac supplies a car power cord for backup power if needed. The unit will also mount on a tripod. All in all, this is a sweet dream instrument.

Yelton is a senior engineer with Beasley Southeast, Miami.

Editor's note: Field Reports are an exclusive Radio magazine feature for radio broadcasters. Each report is prepared by well-qualified staff at a radio station, production facility or consulting company.

These reports are performed by the industry, for the industry. Manufacturer support is limited to providing loan equipment and to aiding the author if requested.

It is the responsibility of Radio magazine to publish the results of any device tested, positive or negative. No report should be considered an endorsement or disapproval by Radio magazine.

Performance at a glance
Self calibrating
Digital tuning, digital field strength display and spectrum display
Digital data capture and storage
SBAS augmented GPS positioning
Harmonics measured to 5.2MHz
Antenna orientation compass
Hand-held or tripod use
Shielded modular construction

Potomac Instruments

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