Organize and Share your Electronics the way you want. Sign-Up for a free account now. It takes only 30 seconds!

7 Element VHF High Gainer

7 Element VHF High Gainer

If you are in a search for an Ideal Beam Antenna, you can go ahead with this project.This antenna contains 7 elements, perfect for the 11db gain with a front-to-back ratio of 20-25 dB. You should need a matching network for this Yagi.
Harisankar chosed a gamma match made from a piece of 3/8″ aluminium tubing 7.25″ long with a piece of RG-8 coax 7″ long. He used the regular RG – 213 coax; but if you use RG-8 poly foam coax, you may need to change the length of coax for the gamma match.
Mount the completed antenna on the mast about 7 to 8 feet above the ground. Set your radio to the center frequency. Place an SWR bridge between the radio and the antenna. Then apply low power for your test transmission. Presently, more than 35 stations are using this antenna, some stations are hunting more than 250 kilometers with 500 mw power; and they are getting 5-9 reports.I have been using this design for the past 7 years. The distance from my location to VU2KOD repeater is 110 km (on air) and I am able to work with 50mW (0.05W) and getting 5 – 6 reports.!
Carefully note the SWR reading and slide the gamma in or out of the gamma tube (varying the capacitance) until you find the best match. Tighten the gamma to the driven element and now you are ready to install the antenna permanently. When the beam is to be vertical, you need to use a non-conducting mast to avoid detuning the beam and thus skewing the pattern. Make it, tune it, fit it, forget the antenna problems.

Visit Here for more.







 

More Articles to Read

Peeqo is a desktop bot that communicates through GIFs
Peeqo is a desktop bot that communicates through GIFs
Using a Programmable Input Multiplier to Minimize Integer Boundary Spurs
Using a Programmable Input Multiplier to Minimize Integer Boundary Spurs
Serial seven segment LED display shield
Serial seven segment LED display shield
G-code controlled drawing plotter
G-code controlled drawing plotter
An Arduino round word clock
An Arduino round word clock
The Sandwich-o-Matic will make your lunch automatically
The Sandwich-o-Matic will make your lunch automatically
Scalar Network Analyser Jr
Scalar Network Analyser Jr
An Arduino-controlled automated whiskey distillery
An Arduino-controlled automated whiskey distillery
The Rex800 looks like a dinosaur Terminator
The Rex800 looks like a dinosaur Terminator
Home Environment Monitor
Home Environment Monitor
Understanding the Operation of the Frequency Synthesizer in Maxim’s RF Transceivers
Understanding the Operation of the Frequency Synthesizer in Maxim’s RF Transceivers
App note: EPIC: Electro-Pyrotechnic Initiator Chip Resistor
App note: EPIC: Electro-Pyrotechnic Initiator Chip Resistor
Noisy ESP8266
Noisy ESP8266
App note: Noise analysis for high-speed op amps
App note: Noise analysis for high-speed op amps
Skill Sunday: Arrays
Skill Sunday: Arrays
App note: Infrared remote control implementation with MSP430FR4xx
App note: Infrared remote control implementation with MSP430FR4xx
Gesture Controlled Smart Home
Gesture Controlled Smart Home
Design for a Wideband, Differential Transimpedance DAC Output
Design for a Wideband, Differential Transimpedance DAC Output
Wrist thrusters let you fly through the water effortlessly
Wrist thrusters let you fly through the water effortlessly
Bertan/Spellman 225-20R HV power supply teardown
Bertan/Spellman 225-20R HV power supply teardown

Top


Shares