Test antennas and specialty filters for the broadcast engineer

Chris Scott & Associates - www.scott-inc.com

How to order

RF test antennas and specialty filters for the broadcast engineer

Am and fm broadcast stations are required to make periodic signal integrity measurements. The National Radio Systems Committee designed specific emissions tests for am stations, which the Federal Communications Commission requires annually. The best instrument used for conducting these measurements is the spectrum analyzer. While approximate AM readings are sometimes obtained with "whip" antennas, the severe impedance mismatch and lack of calibration yield imprecise results. Harmonic measurements require that a known antenna factor be employed to convert spectrum analyzer input voltage to field intensity units. The industry standard LP-3 provides this calibration.

Another key tool is the AM notch filter, which is often necessary to eliminate errors when measuring harmonics with a spectrum analyzer. Frequently internally generated intermodulation products create artificially high harmonic or spurious indications when the fundamental carrier is unsuppressed. By "notching" the primary frequency, reliable accuracy is ensured. Our low-loss version of the classic am notch filter allows measurement forays below -80 dbc at +- 75 Khz, which are required when conducting NRSC tests on stations with power levels of 5 kw and above. Better yet, the dual output version combines both options in a single unit, and remains our most popular unit. See Breaking the 80 dB barrier.

FM notch filters are also available for similar purposes. The completely shielded design has proven useful for resolving blanketing interference complaints as well. FM notch filter

Chris Scott & Associates is a small design and consulting firm specializing in radio broadcast. A partial listing of clients and customers is available.

Whether your visit to our website is professional, or is simply curious browsing, don't miss the "white" papers presented, covering related topics.

Thanks,

- Chris Scott

Will a new FM antenna help my coverage?
NRSC Measurements: Breaking the 80 dB barrier
AM NRSC bandwidth measurements with the LOOP antenna.
Field tuning ERI fm antennas. How to do it yourself.
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Measuring E-fields with the NIST dipole-detector. Do it like the feds.
A new look at the Ufer ground. 1989 RW article.
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How to CHEAT when converting dBs Lets lose the logarithms...
Automate Public Radio programs with pause detection.
Radio automation sub-second timesync ... a pulse delay circuit

Tunable AM notch filter.
LP-3 Standard H-field loop antenna... for AM NRSC and harmonic testing with a spectrum analyzer.
Adjustable standard FM notch filter
175 Mhz High-Pass filter for FM harmonic measurements.
Ten Mhz Low-Pass filter for AM measurements.

Pricing & ordering

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Chris Scott & Associates
P.O. Box 52
Bowling Green, KY 42102

Fax: (270) 781-1232

Phone: (270) 781-5301

Partial listing of clients and customers

1606A for sale

General Radio 1606A Impedance bridge for sale. Excellent condition, with manual, $600. Email for details and photos.