swr protection

ZMV Spiral antennas - An experimental antenna similar to the TAK spiral antenna was evaluated for SWR response over the frequency range of 7.0 to 7.3 MHz, or the 40-meter band.

10 meter wonderbar antenna - 10 Meter WonderBar Antenna, present an SWR 1:1 over entire band, great DX, rotateable by hand, 8 ft long - build for about $20

Broadband 80/160 Meter Dipole - An easy to build single wire antenna for 160 and 80 meters with a better than 2 to 1 swr across the 80 meter band by K5GP

12 elements Yagi for 70Mhz  ^updated Priority listing - A Monster Yagi for 70MHz huge gain, clean pattern and flat SWR 50 Ohm, no matching required

11elements yagi for 70MHz Priority listing - Low Noise 4m LFA Yagi. No matching needed, flat SWR across the band. Ideal for field day etc. Serious gain and F/B by G0KSC

10 elements 70MHz Low Noise LFA Priority listing - A 10 element 4M LFA Yagi. Flat SWR across the band, easy build with no matching to install. No power limit high gain.

Low-Noise LFA Yagi for 70MHz Priority listing - Super flat SWR from this high gain easy-build Yagi. Great for home or fild day.

9 elements 50MHz 12.5Ohm Yagi - A DX antenna for Serious hams. High gain, super flat SWR. The ultimate 9el 50MHz Yagi

Broadband Dipole 2MHz o 30MHz with no ATU - A broadband travelling wave dipole for HF bands, whose VSWR is less than 2:1 from 3 to 15 MHz and does not exceed 2.6 to 1 from 2.3 to at least 30 MHz

Protection for Yagi elements - The following discussion about the Aluminum oxidization & protection of Yagi elements took place in the Moon-Net reflector.

Measuring Antenna System SWR - Have you measured the SWR at the antenna?

SWR with non-resonant antennas - SWR with multiband and non-resonant antennas

Antenna Matching  ^updated - Antennaa matching basics, matching input impedance, reactance vs. SWR, info on inductive matching and UNUN Matching systems. Capacitive Matching Odds & Ends by K0BG

Duoband DK7ZB-Yagis 2m and 70cm - These Yagis cover the range of 144-146MHz on 2m and 430-440MHz on 70cm. They can be used for alle modes (FM and SSB/CW). On both bands the SWR is good across the whole band.

RPF Communications - Innovative and fast growing radio communications accessory company in the UK. Station protection, monitoring and control products, Microphone splitters and headsets

WE-030A Antenna Analyzer - Small and simple to use, this antenna analyzer can speed and ease the tuning and adjustment of HF antennas. It measures the fundamental parameters SWR and return loss.

Telepost - Digital Vector Wattmeters, Dummy loads, software defined panadapter systems, SteppIR Tuning Relay, Digital SWR meters, LP-Pan Pan Adapter IQ Decoder for SDR based panadapter system

FT-817 DC Circuit Protection - A schematic for a DX circuit protection for the Yaesu FT-817, provides protection from the external power supply overvoltage by DL2LTO in german

Cushcraft R7 repair and tests - F5DQK repairing and swr measurement tests of a Cushcraft R7 Antenna

Gap Titan dx SWR tests - GAP Titan DX Measurements of SWR report by WT5L

Return Loss, SWR, Power Gain and Loss Calculator - A neat tool for your daily ham activities around the shack

KD1JV Digital SWR / Power Meter - This small, light weight digital SWR and power meter uses an Atmel AVR Butterfly demo board and a Stockton type directional coupler.

Automatic 1.8 – 60 MHz SWR/WATTmeter - A PIC16F876 based, automatic 1.8 – 60 MHz SWR/WATTmeter A project from Il Club Autocostruttori of the Padova ARI club Italy

Portable RF Sniffer and Power Meter - Whether we are tuning up homebrew equipment, checking antenna VSWR, adjusting a linear amplifier, or just monitoring output power during a contest, almost all aspects of ham operation can use a power meter. Paul Wade W1GHZ

QRP SWR Meter - SWR meter for low power output measurements, dedicated to QRP operations