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Antennas : 160M
The Doble L antenna for 160 and 80 m
- The antenna has the form of a C, it is fed in the centre of the vertical section which is abt 20 m high by HB9TPL
W5JGV Mobile Antenna
- A High Efficiency Extended Length Mobile Antenna
The antenna itself is 3.42 meters or 11 feet 2 inches long from the top of the mounting spring to the tip. By W5JGV
Another vertical antenna for 30, 40 and 80 meters
- This article is to describe a multi band DX-dedicated antenna offering a minimum of compromises (such as lossy traps), for the hams not having any high-support
Falling Derrick Method of Tilting Up a Tower
- A homemade 16 foot falling derrick to tilt up a 50 foot high, 18 inch wide Glen Martin aluminum tower by N6RK
Making the W3DZZ Video
- A video guide of how to make a high performance,low cost HF multiband antenna for the radio amateur and shortwave enthusiast.
Fantastic performance and low cost.
Video made by Mike (M0RRQ)
High Performance 802.11 Antenna
- It is cheap and simple and has a gain of about 17 dBi.
WA8YWO
- High Frequency Expermental Beacon "WV". The Beacon operates on the frequency of 13.55567mhz. This Beacon is very low power. It operates under Part 15 of the FCC Rules and Regulations. It transmits with only 1.5 milliwatts of power
OH Beacons
- List of OH beacons running on HF VHF and higher frequencies
YouTube - Amateur (ham) radio balloon launch
- High-altitude ham radio balloon launch by several louisianna universities
Antennae Depot
- HF Yagi and Vertical antennas for Amateur Radio.
Full line of mono-band HF antennas (40, 20, 15, 10 m) high-efficient yagi beams from Russia
Ultrasonic Systems
- Manufactures high performance spray coating equipment based on patented ultrasonic spray coating technology.
Signal Forge
- The signal forge 1000 signal generator is a portable, high-performance digital and rf signal source with a 1 ghz frequency range. features include digital, differential and ac coupled outputs
Colker company
- Window cleaning supplies for all residential, commercial, and high-rise work.
Rescue Technology
- Selection of technical rope rescue equipment for high angle, confined space, industrial, and water rescue
Arizona Near Space Research
- Arizona near space research - promoting science and education by exploring frontiers in amateur radio and high altitude balloons.
AMSAT & High Altitude Balloons
- Balloon Projects, scheduled launches at amsat
New England Historical Radio Society
- The New England Historical Radio Society Inc. is an organization dedicated to the preservation of commercial Morse Radiotelegraphy on medium and high frequency.
AADE Filter Design
- Freeware windows programs to design Butterworth, Chebyshev, Elliptic (Caur), Bessel, Legendre and Linear Phase low-pass, high-pass, band-Pass, and band-reject filters. Coupled Resonator band-pass filters
RufzXP
- RufzXP is an excellent free training software for improving code speed and CW practice, particularly (ultra) high speed memory copying of true amateur radio calls.
Enable Low Cost RF Power Amplifiers
- A new paradigm for low cost, reliable RF amplifier ‘pallets’ has been enabled by new circuit design, manufacturing and thermal management techniques
Highly linear rf power amplifier design
- The need of high linearity is one of the
principal drivers in the design of power amplifiers
for new generation applications
Power Aamps RF voltages
- This test circuit is easy to duplicate, and demonstrates the extreme voltages that appear in an amplifier when the load is improper for the amount of drive power applied.
Building High Power Amplifiers
- SM5BSZ article on building VHF RF amplifiers
5th order High Pass VHF Filter
- Sometimes many VHF-UHF modern transceivers have problems with BROADCAST Interference and CROSS-modulation from FM commercial broadcast stations this article shows a simple Batteworth HI-Pass VHF Filter to reduce this problem
HV power supplies
- WV0NNI 2,800 VDC @ 2 Amps Continuous Variac adjusts filament voltage. A voltage doubler circuit, well suited for smaller, compact linear amplifiers.
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