Revised September 19, 2011

Welcome to jimpollock.net


James W. Pollock P.E., CBT, CBNT

Professional, Analytical, Technical, and Field Services
for
Radio Broadcasters and Industry

216 Kingsley Court
Mount Laurel, NJ 08054

Email

609-217-4877 (cell)


√ Skilled RF Engineering and/or RF Technician Services
-RF Network, RF and Analog Circuit Design, System Integration, Testing. -Computer Modeling. -Mathematical Analysis. -Algorithm Development.
√ MF, VHF Phased Array analysis
√ RF Safety and related analysis for FCC Compliance
√ FCC Inspection Preparation.
√ LPFM Spacing and Feasibility Studies.
√ Field Strength Measurements.
√ Transmitter Site Inspections and Maintenance.
√ FCC Parts 1, 2, 11, 17, 15, 68, 73, and 74 Compliance.


Credentials

Education, Licenses, Training, Experience



Links to Partners and Friends

Communications Technologies Inc, Marlton, NJ.

The Broadcaster's Desktop Resource. Tucson, Az.

Radiotechniques, LLC. Haddon Heights, NJ.

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Articles, Essays, Utilities, Features, Downloads.



SBE Chapter 22 Expo; 06 Oct 2010
Presentation and Notes
Complex Impedances and Spreadsheets

(Zip File)

Low Power FM

Jim's Essay on LPFM
May 05,2011.
[] How to get started.
[] What to do, and when.
[] Budget Hints
[] Useful references, and links to web sites for the information you need.

Articles by Jim


Follow these links to the Broadcaster's Desk Top Resource.

DC-AC Power Inverters.
[Observations and Planning Tips for Power in the Field.]

LPFM; A Difficult Fight to Stay in the Game.

The FCC's LPFM Channel Finder.

Exploring the Viability of LPEM Second Adjacent Channel Waivers.

FCC Inspection Preparation.


LPFM Check List
(An FCC document: It's about compliance awareness.)

How to Avoid FCC Fines
Stop that annoying "Cha-Ching" noise.
Follow this link to the Broadcaster's Desk Top Resource.



Engineering Notes and Tools

Spread Sheet(.xls file) Note:

The "COMPLEX" function for spread sheets is a function that processes complex numbers, i.e., R+jX, R-jX. Reference the Spread Sheet "HELP" file on how to activate and/or install this function.


TEE_NETs View and save PDF Document. Mini-Refresher: How to use Loop-Mesh Equation techniques to analyze a TEE network.


Method of Moments (MoM) Computer Modeling

December 26, 2009. ATU Stray Components (PDF) Method of Moments (MoM) Precautions. Don't let Antenna Tuning Unit (ATU) strays lead you astray on Tower Impedance Measurements (pdf).

Revised January 07, 2010 AM Tower Self Impedance Calculator. (Excel) A spread sheet for calculating the self impedance of a tower, by taking the influence of the Antenna Tuning Unit (ATU) Stray Components into account. Format of the worksheet revised to make data entry flow with the schematic diagram.


ATU_MoM_MathCad Source File (Zipped) MathCad 13 source file for handling up to six(6) sets of Antenna Tuning Unit (ATU) measurements for six(6) towers. ATU_MoM_MathCad File (pdf notes) Commented source file for applying the algorithm to other platforms.


Tower Drive Point Impedance in an MoM Model (pdf)

ATU Output Current Ratio and Phase Shift Calculator. (Excel) Calculates the effects of ATU Output circuit strays under operating conditions at a specified drive point impedance.



Terrestial Path Engineering.


VHF-UHF Studio-Transmitter Link (STL) Planning.

Revised January 01, 2010 STL Plan and Theory An overview of planning a VHF-UHF line-of-site propagation path (with Fresnel Zones) for an STL link (pdf)

Revised January 04, 2010 STL Worksheet (Excel)



Antenna Theory


January 13,2010 FM Antenna Vertical Plane Field Curve Prediction (pdf) With only 1 to 3 data points. Generate an accurate table of Relative Field vs Angle of Declination from the Horizon in one degree increments for single and multi-bay antennas.


The FM Directional Antenna: How to specify and Buy it.

Follow this link to the Broadcaster's Desk Top Resource.



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......the primary question is not what do we know, but how do we know it? ..... Aristotle


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