circuit design

K5TR'S Antenna Designs - YO files - Antenna designs that K5TR have collected from various sources.

Notes on building Yagis for 50 Mhz - Construction Details for 50MHz-Yagis in DK7ZB-Design

WB7PMP 4 and 7 eleemts yagi for 50 Mhz - Original drawing and design of a 4 and 7 elements yagi antenna for 50 Mhz

70cm Longyagis - 70cm-Longyagis in 28Ohm-DK7ZB-Design

Shortened Center-Fed Half-Wave Dipole - Design your owm HF shiortened dipole

Single Coil Z Match - Single Coil Z Match, circuit Diagram and homebrewing notes

Remote Control Antenna Switch - The Remote Control Antenna Switch consists of two circuit boards. The control unit and the remotely controlled switch

Quagi antenna for 144 Mhz - A modified W5UN Quagi design optimized for 144.050 Mhz

Receiving Antenna Design - Learn basic theory on antennas, and notes on homebrewing efficient shortwave antennas

KC1XX Contest Station - Amateur Radio Station owned by Matt Strelow. The station is designed for competition in the multi-operator multi-transmitter category of high-frequency DX contests. Running with 7 towers 6 rotators, 8 beverage listening antennas, and 4 spotting verticals

Tesla and Radio - Nikola Tesla created a basic design for radio

6m technical docuemnts - A collection of scanned diagrams and designs, documents and modifications for 50 Mhz ham radio equipment

Improving Heathkit SB-220 - Circuit Improvements for the Heath SB-220 Amplifier

Circuit Improvements for the TL-922 - by Richard L. Measures, AG6K

WASP-NET - Complex CAD and Optimization Software for Waveguide, Coax, Combline and Antenna components design and antenna modelling

Heathkit SB-200 Modification - Tuned input circuit modification by Tom Boza - NE7X

4CX1500 - This is a 4CX1500B grid driven amplifier that is built like a tank. The unit is considerably over designed as can be seen in the pictures documenting the construction

The Approx. Perfect Amplifier manuscript - Discussion of some design features that would be present in a perfect, or near-perfect, amplifier.

Introduction to amplifier design - These tutorials will teach you in very easy steps how to design A class amplifiers.

Negative feedback output circuit - Negative feedback is often referred to as shunt feedback in conjunction with emitter degeneration.

Morse Code Beacon Keyer - This circuit stores a single morse code message as bits in an EPROM chip, the message is sent to a relay which can key a CW transmitter.

Band filters by PA9M - Band filters for PA6Z made by PA9M, designed by W3NQN.

Improvements for TS-830S - Circuit Improvements and Maintenance Procedures for the TS-830S

Circuit Improvements for the TS-430S - by Richard L. Measures, AG6K

A regenerative receiver with 6SN7GT - Circuit to build a regenerative receiver