mars mod

A 16 Turn S-Band Helix - This design represents the smallest practical antenna for Oscar-13 mode-S. Perfect beacon reception at all times is possible, and acceptable SSB even at 43,000 km range.

A 5 band log periodic dipole array - Modified version of the Telerana antenna which was orginially featured in the July 1979 issue of QST. The array is suspended within a framework made of fiberglass poles emanating from a central hub with the ends tied together with light weight rope around the perimeter. 10-15-20-30-40 meter band coverage

Loop Antenna Design - Full-wave loops are very popular antennas. They are especially useful on 80 and 40 meters where they perform well at modest heights

A Modern Thermocouple Ammeter - Thermocouple ammeters are very rare these days, but the job they were perfect for - measuring antenna currents - is still a modern requirement especially in respect to groundplane currents. By David A. Reid PA3HBB G0BZF

Wifi Antenna Tests - Comparison Test of Marska wlan-antennas

Slotted Waveguide 802.11b WLAN antennas - 802.11b WLAN Waveguide Antennas Unidirectional & Omnidirectional. High gain, Simple construction by Trevor Marshall

BiQuad 802.11b Antenna - BiQuad 802.11b Antenna 11dBi, wide band by Trevor Marshall

Dish 802.11 Wireless Networking Antenna - This antenna modification is for the IEEE 802.11b networking protocol that operates at 2.4 GHz. It can be scaled easily to the 5 GHz frequency used by IEEE 802.11a by simply scaling the dimensions on the feed can and the excitation antenna to 2.4/5 = 48% of the dimensions shown above.

DirectionalWaveguide - Seattle Wireless - Waveguide antenna is a type of DirectionalAntenna and is a modified waveguide. A waveguide is simply a tube, either rectangular or cylindrical in cross-section, that will carry a microwave radio signal with very low signal loss

1TA157 Using PSK31 on cb band - CB band in Italy using latest digital modes

JA0JBA EH Anntenas - A blog dedicated to EH antennas and other antenna modelling in general

PacComm Packet Radio Systems - Packet Modems, tnc, portable tnc manufacturer

Using the Heath SB-200 Linear on Six Meters - Improvements to Using the Heath SB-200 Linear on Six Meters by Ron Klimas, WZ1V

Less White Noise - FT-897D Modification - Modification for FT-879D to remove the white noise spreaded far above 3 kHz by Petr OK1FIG

Circuit Specialists - We specialize in pc-based data acquisition systems, test equipment, electronic components, disk on modules, choke and coils, diodes, capacitors and connectors, potentiometers, crystals, resistors, relays

Yagi Modeler Applet - This java applet/application implements a simple yagi modeling code. The initial input is a really trivial 2 elmenent yagi.

Easyterm EZT3271 - Easyterm for Windows(3.xx and above) is a sophisticated commercial application written for the amateur operator who wants to utilize all of the features of the AEA, HAL, Kantronics or SCS (PTC-II) modems from Packet to AMtor, PACTOR, PACTOR-II(PTC-II), GTor(Kam+), Clover(HAL) or PSK31 (PTC-II).

SatTrack Suite - Satellite Tracking and Orbit Propagation, Reports and Mission Planning Products, Pass Scheduling and Orbit Event Analysis, Dynamic Communications Link Modeling, 3-D Visualization of Complex Scenarios User Defined Regions and Contours, Constellation and Formation Flying Support, Global Positioning System Coverage

WZ1V's VHF modifications page - A collection of modifications to the AM6154/55 linear amplifier

Simple Reverse Polarity Protection - This simple modification is applicable to pretty much any 12 volt operated, positive earth equipment. by Chris Cox, N0UK, G4JEC

Hombrewing an HF Transceiver - This page will describe the construction of a multi band SSB transceiver with all its components Band Pass Filter, Oscillator/Modulator unit, RX/TX Mixer TX Amp I.F. Amplifier AGC VFO Driver amplifier Receive audio amplifier Final amplifier Low pass filter Digital display and VFO stabiliser

Display/Stabiliser unit - The Display/Stabiliser unit displays the signal frequency on a Hitachi LCD module.

Television channel 11 interference. - Solving interference from television channel 11 on 144MHz transverters by Chris Cox, NĜUK, G4JEC

Common-Mode Noise - Receiving Common Mode Noise shows how lack of a balun can contribute to system noise

Automotive RFI elimination - ARRL pdf file on how remove car noise from your radio. Modern vehicles are RF noisy environments. Come learn how to identify and silence yor mobile noise sources, by WA6PDP