Radiospurs.com a header site

Leading to specialised web sites.

Filter Site

This is a site dedicated to the design of lumped element filters. There is coverage for Low Pass Filter design of Butterworth, Bessel, Chebychev Type 1 and Type 11, Elliptic (odd and even), Papoulis, Guassian, Linear Phase Filters

We cover synthesis and analysis, ideal, real, standardised components. Graphs for loss, phase, group delay, rho, smith.

Power analysis involves defining an excitation power. The component voltages, currents and power dissapation for real components are calculated. Graphs give the real and reactive voltages and current with frequency. Very usefull for avoiding chisping in that broadcast filter.

Microwave Site

This is a site dedicated to the design of microwave components. Microwave combiners are covered in the dedicated combiner site.

Coverage is given for:

Coaxial and related: circular and rectangular.

Microstrip: synthesis and analysis, loss and Ereff with frequency, single dielectric, suspended, choice of substrate from a catalog.

Stripline: classic homogeneous, slabline, powerline, both sythesis and analysis, choice of substrate from a catalog.

Parallel Couplers: Single stage parallel couplers in microstrip, stripline, slabline, broadside, cpw. Analysis andf sythesis with choice of substrate from a catalog. Graphs of loss, phase, rho, smith with frequency. Odd even mode compensation.

Stepped Line Transformer: Microstrip stepped line transformers, ideal and with step compensation. Graphs of loss, phase, rho, smith with frequency.

Microwave Filter Site

This is a site dedicated to the design of microwave filters and couplers.

Interdigital filters: Design and analysis of quarter wave filters both Butterworth and Chebychev type 1 bandpass. Graphs for loss, group delay, rho, smith.

Microstrip Parallel Coupled Filters: Design and analysis, choice of substrate from a catalog. Graphs for loss, group delay, rho, smith.

Multistep Parallel Couplers: Custom for arbitrary designs both symettrical and asymettrical, classical symettrical U couplers, classical asymettrical couplers, inverted U symettrical. Choice of microstrip substrate from a catalog. Graphs for loss, group delay, rho and smith.

Combiner Site

This is a site dedicated to the design of various type of power combiners.

Wilkinson: Classic single stage transformer input/output systhesis and analysis. Graphs of combined power, rho, smith, isolation and dissapation under various load fault conditions. Choice of substrate for microstrip designs.

Triway coupler: using lumped elements, with or without an integrated low pass filter.

Hybrid: classical 3db hybrid from lumped elements for power designs. Synthesis, analysis, power dissapation. Grpahs for combined power, phase, rho, smith. Component voltages and currents.

Power components: Capacitors and inductors for power designs.

Misc Site

This is a site dedicated broadcast related functions.

Power pads: Phi and T resistive power pads. Design analysis. Dissapation, voltages, currents, power when the drive power is supplied.

Propagation: Propagation analysis using classical path loss, Friis, Egli and Langsley Rice methods. Terrain profile is given for the LR method.

Waveguide: A dimension table for standard rectangular waveguides.

Meteorology: Understand the weather forecast.

Propagation Site

This is a site dedicated to propagation analysis using the Langley Rice Equations

A suitable area of the world is choosen. The location of the transmitter choosen. A suitable end point for a link is choosen by switching between the general map mode and terrain maps.

Switching to the link mode the transmitter and receiver parameters are entered in preparation for the analysis using the specific Langley Rice terrain parameters.

Broadcasting Site

This is a site dedicated FM broadcast equipment.

Stereo Encoder: A pure digital stereo encoder using an asynchronous DSP sample loop.

RDS Encoder: A pure digital rds encoder using a novel symbolic modulator.

SNMP: A discussion and description of SNMP software for monitoring and control of FM transmitters.

Software: Various components for incorporation in a software mixer.