Meter Yagi Design Software' title='2 Meter Yagi Design Software' />Ham Radio Library. Do you have trouble getting your mobile signal into the LEO satellitesTry 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 drill holes in the roof of my new truck to install a more substantial antenna. I had been using a very common 14 wl mag mount with only marginal results. Design This is a high efficiency gain antenna. Meter Yagi Design Software' title='2 Meter Yagi Design Software' />This antenna will extend the range of your WiFi or 2. GHz devices like surveillance cameras into many miles and kilometers. A yagi antenna is basically a teles. PowerSDR ke9ns v2. Flex1500, Flex3000, and Flex5000 models Click on images below to enlarge v2. Programs to design some of the most common types of antennas and a some experimental antenna designs. Moxon Antenna suitable for 27MHz CB. Dimensions can also be used on lower 28MHz Amateur Radio operation band. The main advantage of Moxon rectangle antenna. It is not mounted permanently I have a magnet attached to it and throw it up on the roof when I want to work a LEO satellite. The antenna is an atypical vertical instead of the common 14 wl vertical monopole or 1. Effectively, an off center fed vertical dipole that does not rely on the earth or, in my case the truck body, to complete the bottom half of the antenna. This is an important point. The fact the antenna has a fully contained lower half, i. This is especially significant when compared to my mag mount monopole antenna where the ground plane had to be completed through the coax, through the rig, then to the vehicle body. I suspect the mag mount was not very efficient at all. The dipole is off center fed to get a better match to the feedline and the bottom half of the antenna is completed with capacitive reactance from the four shortened radials. This design has an honest 3 d. Bi of gain at 6 elevation 2 d. Bi free space with a suitable pattern for LEO communications favoring the horizon. At 2. 0 high, the same antenna exhibits almost 6 d. Bi of gain. The feedpoint is a nominal 5. Ohms at 1. 46. 8. Hz. Construction The antenna is built using a 34 PVC tee, a cap for the top, and a plug flat on the bottom for the bottom. The tee is arranged vertically with the top cap drilled for connection of all 5 elements I used 6 3. The coax is fed thru the open side of the tee and connected directly to the elements via ring lugs. Alternately, a lower profile version could be constructed substituting a coupling for the tee and drilling a hole in it for the coax to exit. I connected the center of the coax to the mast and the shield to one of the radials using crimp style ring terminals. I then wrapped some small gauge wire around the outside of the cap, connecting all four radials together, and covered the assembly with electrical tape and paint. Youll need to cut two pieces of PVC pipe. One piece will be 17 12. The other 7. This, along with the PVC connectors, will form the frame of the antenna. VHFUHF Yagi Antennas. MHz. This antenna is the veteran of several Grid Peditions but I have yet to actually measure the gain. Meter Yagi Design Software' title='2 Meter Yagi Design Software' />The figure at right shows the layout and dimensions in cm of the elements. A 2. 5 31. 6 6. I recommend you make the elements slightly longer and then trim them based on SWR readings. I used 1. 0 gauge insulated wire for all the elements, but 18 or 31. When tuning for minimum SWR, I eventually pruned the mast to 2. SWR. That is much better than my mag mount ever showed so I stopped fine tuning and put it on the air. The radials are angled down at about 3. METER SSB YAGI PLANS FOR SIDEBAND FUN This 6 element beam was designed using the free Yagi Antenna Design program by WA7RAI called Quick Yagi QY4. The Backwood Realm Technical commentary from Tim Wray, plus a few other things. This angle can be adjusted to get the SWR perfect once the vertical mast is trimmed for best SWR at the desired frequency, but I found the effect minimal. You could also wind a coil of a few turns in the center of the mast to lower the profile of the antenna without affecting feedpoint impedance drastically or performance too much. I did that to make it short enough to fit under my garage door header and note no significant difference in SWR or performance. Performance Mission accomplished. I can now get into the birds at low elevations. On its maiden journey out of the garage, I worked four stations one was marine mobile on an 8 degree AO 2. If I could hear the bird, I could work it as long as a big gun station did not have the bird already captured. At high elevations I found I could run on low power about 3 Watts and capture the bird with little difficulty. This antenna makes a nice companion to the 7. Handi Tenna or can be used for any fixed, mobile, or portable service. Since the elements are flexible 1. Aricle by K5. OE originally availbale a http members. Moxon Antenna CQDX1. CB Radio Citizens Band Radio. Moxon Antenna  suitable for 2. MHz CB. The main advantage of Moxon rectangle antennas are Compact and Light Weight. Considerable Directional gain over Isotropic. Lower noise on Horizonal Polarisation. Easy to construct from tube or wire. Suitable for HF DX operation mid low Horizontal radiation angleThe Moxon antenna has proven popular because of the ease of construction and low cost, but still yields exceptional HF DX results at low mounting in clear space. Obviously like most antennas the higher it is mounted above the ground and nearby  obstructions, the performance will improve markedly. Some use Bamboo or squid poles in an X with wire as the elements, while others prefer tube elements from a central boom with wire and a non conductive spacer between the element tips. This method allows the coax feed point to be supported by the boom more conveniently. Apparently the configuration of the elements folding and interacting combine to present the coax feedpoint with a 5. Ohm load to the transceiver avoiding the requirement for any matching or balun. Like any antenna construction project, you will need to ensure that the SWR is acceptable in this form prior to transmitting for any length of time at full power to prevent damage to your finals. The below diagram is a PLAN View, or view from above looking down on the layout of the elements as if they were placed on the ground. Acunetix Web Vulnerability Scanner 8. Dimensions. A 3. B 5. C 1. 1. 2. 5 cm 4 71. D 7. 3. 4 cm 2. E 1. Construction PLAN view using aluminium tubing on Horizontal main boom and heavy copper wire on sides between front Director and back Reflector tubes with insulator between wires. NOT TO SCALE Gain, Radiation Pattern mounted at approx 3. Gain Approx 1. 0 1. Bi 3. 0 feet above the groundFreq range 2. MHz 2. 8. 3. 00 MHz. MFJ 1. 89. 0 1. 0 Meter Moxon AntennaTested on 1. CB BandMFJ MOXON Quick Look From CBRADIOMAGAZINE. The MFJ 1. 89. 0 is a lightweight aluminum antenna designed to operate in the 1. What is a Moxon antenna Here is a quote from wikipedia for the definition The Moxon Antenna is a simple two element parasitic array antenna that is popular with Amateur Radio enthusiasts for its simplicity of construction. The design is rectangular, with roughly half the rectangle being the driven element and the other half being the reflector. It can by thought of as a Yagi Antenna with bent elements and without directors. The antenna is credited to Les Moxon G6. XN, and while it is well known by most ham operators, many CBers may be unaware of this design. The Moxon offers excellent front to back gain and good rejection as well. Its footprint is probably the biggest positive attribute, as its only 1. Yagi or a V Quad. We also tested the rejection and I turned the antenna around to see how much the signal dropped off and his signal went from a S5 S7 down to a S2. Quite impressive for a two element antenna. The advertised forward gain for this antenna is 3. Bi and the front to back rejection is listed as 3.