If you work on the Technical Side of the Radio Broadcast Industry, this is your gateway to design the hardware of your profession. There are articles on FM transmitters, Propagation analysis using Longley Rice calculations. Passive filters, microwave filters. Power combiners, Wilkinson, Hybrid. Couplers, microstrip, stripline, edge, broadside, slabline, coax. Interdigital filters, capacitive gap, edge coupled. Its all here.
See WEB SITE DETAILS, above for a more complete description of each web site.
General Broadcasting. Stereo Encoder, RDS Encoder etc...
Passive filters. Butterworth, Chebychev 1 and 2, Bessel, Legendre, Bessel, Elliptic
Combiners (Wilkinson 2, 3, 4 way, multistep, with filter), Hybrid
Power Components, Power Capacitors, Power Inductors
Microstrip(normal, suspended, inverted, with substrate, edge couplers)
Stripline (normal, mixed, slabline, power line, edge coupler, broadside)
Microwave filter, Interdigital, Parallel Coupled, Gap Resonator
Cascade microstrip couplers (Symmetrical, Asymmetrical, Custom
Propagation (Path loss, Friis, Egli, Great Circle, Longley Rice)
Waveguides, Meteorology, SNMP engines
Interactive Propagation Analysis, Radio Link, Broadcast
New November 2024
The Combiner Analysis has been expanded to include Compact Wilkinson Splitter designs of Webb, Scandalletti, Lumped types. A section has been added on Bagley power dividers with odd 3, 5, 7, 9 port splits. Also two even divider types for 4 ports and 6 ports. If you want 8 ports let me know.
October 2024:
An analysis of Isotropic Antenna Array has been added to the antenna site. There are linear, no-linear, planar, circular arrays in different formats uniform, binomial, chebychev. I think that will be last of antenna analysis for now, enough of translating spagetti code of old programs. By the way the array analysis is pure Balanis.
The design and generate, analysis of compact splitter/combiners, Web, scandetti, lumped all that information that practical information that the brown paper bag is unable to give you. Kang we will not do for the obvious low practical use of this design
May 2024
Due to bulking the antenna design aps have been transferred to a dedicated website, instead of being embedded in the propagation site. So please re-direct any book marks to the new site https://antenna.radiospurs.uk. A few more antenna analysis apps have been released. Now there are basic dipole, folded dipole, short dipole designers along with corner antennas with a dipole.
March 2024 The Longley Rice Propagation analysis has been revamped. Instead of using multicore preocessing which proved not that fast and intermittant. Now concurrent processing has been deployed with a reduction 8 times in processing time. Now a 50Km radius broadcast analysis will take around 10sec. There are also some minor tweaks to the presentation of results. An antenna manufacturers catalog will be deployed soon.February 2024
A new 4 way inline designer has been uploaded. Both clasical approaches are analysed. The 2:2:1 cascade and 4:1 single section are dealt with. As usual we cater for translation of the design to microstrip. Translation to slabline, for high power designs is also provided. I found the slabline approach of particular usage for both 5Kw and 10Kw Band 11 Tx designs. Very low loss. Enjoy!
January 2024
In keeping with December 2023 the interdigital filter calculation now has a microstrip designer. Choose a substrate from the catalog, do the design up to 15 resonators, both odd and even counts. Then enter the analysis to check the design. Open resonators end, wrap round resonator shorts, track thickness and loss are takern into account. Neither the brown paper bag nor "marti" nor "the tulip" sites offer these features.
December 2023
The Interdigital filter synthesis has been revamped. The calculation of the rod length has been improved with a new gap capacitance calculation. A design analysis has been added so that the synthesised dimensions can be analysed for the practical response. Since the gap capacitance is critical to achiving the correct operation a Tune feature has been included so the gap capacitance can be tweeked to confirm the design.
November 2023
A Log Yagi design has been added to the Yagi antenna page along with custom yagi design. Choose the values correctly to get an EndFire boom.
Helix antennae for both axial, Woodyard and normal formats have now been completed. These analysis complement the Horn designs for UHF antennae. The Yagi_Uda analysis has been expanded to include radiation patterns and element currents.
July 2023
The Longley Rice equation propagation site for the analysis of transmission links (STL) now covers All of the Americas (North, Central, South), Western Europe, Australia, democratic Asia, Africa and more. The UK Broadcast is now operational, on both normal and detail maps.