9 simple

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A Lowband Antenna that is Almost Free - The Shunt-fed Tower, an effective Low Band Antenna, uses your beam as a capacitive top-hat and only needs a simple feed network and a good ground system to work DX on 80M and 160M.
[ Hits: 18646 | Votes: 4 | Rating: 7.75 ]

9 element yagi for 2 meters band ^pop - A simple design of a 9 elem. yagi antenna for 2 meters band
[ Hits: 53054 | Votes: 259 | Rating: 5.23 ]
QM5 Yagi for 2 meters band - The QM5 antenna is a simple 5 elements Yagi with 1.88 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts. It exhibits a forward gain of 9.17 dBd; i.e. 11.3 dB forward gain over the isotropic radiator, while the F/R is about 11.5 dB. Elements
[ Hits: 6823 | Votes: 4 | Rating: 5.25 ]
Portable Yagi for 144MHz - Simple 7 element Yagi is ideal for portable operation. The elements can be removed and replaced in a few minutes. The 2.42 m boom will fit inside a car, the elements are made from 6mm solid aluminium rod.
[ Hits: 14316 | Votes: 35 | Rating: 6.83 ]

80M Vertical antenna with capacitance hat - Simple wire antenna cheap to make, using readily available materials, Low angle radiation, with rejection of high angle signals Wide bandwidth, with resonance at the 80M DX window (3.790-3.800 MHz); and Maximum height is 40 feet
[ Hits: 24993 | Votes: 23 | Rating: 7.05 ]

The 9:1 balun ^pop - Homemade 9:1 antenna balun simple project
[ Hits: 33237 | Votes: 36 | Rating: 6.16 ]

The DK7ZB-Match for Yagis - Simple, easy to built match developed in 1995 for Yagis with resistitive loads of 12.5, 18 and 28 Ohm.
[ Hits: 3618 | Votes: 8 | Rating: 6.38 ]

G5RV Antenna Homebrew - Homebrew G5RV a simple multiband antenna. This article shows detailed pictures of a G5RV home made antenna, including antenna size and dimensions by 9M2ZAK
[ Hits: 1554 | Votes: 4 | Rating: 7.25 ]

HF J-Pole antenna - A Simple Nondirectional Antenna for Ten Meters QST February 1950, Easy to build J-Pole antenna for restricted space.
[ Hits: 6558 | Votes: 3 | Rating: 3 ]

A Hanging Rectangular Loop Antenna - A rotatable hanging loop antenna that has been specifically designed for hanging in a tree. Horizontally polarized with a broad azimuth pattern and gain of nearly 3dB over a simple horizontal dipole!
[ Hits: 3742 | Votes: 9 | Rating: 7.79 ]

9 band vertical HF antenna by RW3XA ^pop - Simple vertical radiator with matching box. No traps, no tuner required for this multiband antenna
[ Hits: 38529 | Votes: 43 | Rating: 7.34 ]

43.33 Km LOS with USB WiFi stick ^pop - Simple USB 802.11b WiFi adapter with original antenna used for this 27 miles long-range wifi connection test by adam 9A4QV.
[ Hits: 51074 | Votes: 103 | Rating: 5.64 ]

Yagi Modeler Applet - This java applet/application implements a simple yagi modeling code. The initial input is a really trivial 2 elmenent yagi.
[ Hits: 2891 | Votes: 29 | Rating: 6.07 ]

CI-V Test - CI-V Test for Win98 (others not tested, but should work) is a simple freeware program to display received CI-V messages in Hex and text, and send commands for test purposes to the rig. This program is not intended to convienently control your rig, just explore the functions of CI-V.
[ Hits: 2282 | Votes: 6 | Rating: 8.67 ]

Cheap and simple HF dummy load - This is the report of a MFJ-259B analysis of two 100 ohm / 5 watts resistors in parallel partially in italian
[ Hits: 2080 | Votes: 4 | Rating: 6 ]

A low pass filter circuit - A simple 7 element, Chebyshev low pass filter, rolls of at 30MHz. Attenuation is better than -40dB at 60MHz, -65dB at 90MHz, -80dB at 120MHz.
[ Hits: 5290 | Votes: 21 | Rating: 6.1 ]

ACWS: Automatic CW Sender by iz7ath - Simple circuit, with a simple push, transmit a memorized Cw messages
[ Hits: 1444 | Votes: 1 | Rating: 8 ]
CW Filter - I0QM Gaussian CW Filter page This Filter for the weak signals is the evolution of the simple Universal State filter, already published on "Radio Rivista", the 8/1993
[ Hits: 1858 | Votes: 2 | Rating: 8 ]

A CW TX for 80 meters band - This simple circuit will give about 1.2 Watts of output when powered from a 13.8VDC supply.
[ Hits: 1731 | Votes: 1 | Rating: 10 ]