An original project by I0QM of a 7 element yagi anetnna in a PDF File. The QM7 antenna is a simple 7 elements Yagi with 3.7 m boom length for the lower 144 MHzSSB/MGM band forward gain is 1.35 dBd; i.e. 13.5 dB forward gain over the isotropic radiator, while the F/R is about 12.5
G3SYC began designing and using a LPY on 6 metres in 1991. Since then he has refined the design and has worked some superb dx from his qth in IO93. The design featured here evolved in 1996, and is the mk2 version. This yagi antenna has a very clean polar pattern and a good front
Do you have trouble getting your mobile signal into the LEO satellites? Try this small 2 meter vertical antenna with your mobile rig or HT and enjoy more success in your uplink. I built this small vertical because I could not uplink very well at low elevations and I just could not bring myself to
Concepts The halo is an omni-directional antenna with horizontal polarization. This is practically a horizontal loop, namely a half-wave folded dipole, with its endings slightly separated. The feeding is done through a system called gamma-match with the condenser obtained by inserting the central core of rg58 cable including the insulator, inside the aluminum tube that
Low profile operating APARTMENT ANTENNAS Successful apartment operating starts with an evaluation of the location. Are you lucky enough to be on a upper floor? Is there trees outside? How about a deck? Maybe even access to the roof. Any of these situations can be advantageous. One thing to remember with apartments is to try
Alain Miqueu, F6ITV Which monoband directional antenna can provide a good gain, a good F/B ratio, being not to large and mechanically within hamradio skill? As it is used to say, it’s a process that consists in searching the best compromise. This excludes high-gain and long-boom Yagi that are very large and heavy. A 3-element
Dear Fellow Hams Here are the numbers for the Copper Cactus J-Pole antenna!I hope you are already familiar with the construction of the standard J-Pole antenna, so I won’t go into any unnecessary detail. The antenna may be built as a MonoBander, DuoBander, TriBander, QuadBander or whatever with great success.You can either feed it with
Can you use a pipe cutter or a hack saw, can you solder – then here is how to build a SIMPLE ”J” antenna that will more than double your 2 meter (and even 440) performance! by Dale “Kuby” Kubichek, N6JSX
Do you have trouble getting your mobile signal into the LEO satellites? Try this small 2 meter vertical antenna with your mobile rig or HT and enjoy more success in your uplink. I built this small vertical because I could not uplink very well at low elevations and I just could not bring myself to
The W5UN Quagi 97 is a computer optimized quagi derived from the original W5UN Quagi of the early 1980s. The length of the 1997 model has been deliberately shortened to allow it fit on a 24 foot boom. Performance is substantially higher than that of the original antenna. It now compares favorably with yagis of