Tom, You'd love this latest Capacitor Antenna book from AntenneX. From the hype they are sending out, It is going to be a source book for info on those newly invented dummy loads they call the CFA! 7
Larry, A balun is necessary and always a problem at VHF and UHF which often adds lots of complexity to a Yagi design. The most successful and widely used UHF baluns seem to be the half-wave type in c
John, Of course there are electrical improvements that can be made to these Yagis. After all, they are 25 years old! I have modeled them on the same boom. However, none of the improvements significan
Gene, Whose ears must be good? Surely not the QRP station. In fact, if the DX station is weak, the QRP station will more than likely not get through. QRP requires a reasonable antenna system with lot
Glenn, I'll echo any reports on not using aluminum wire for a grounding wire. Many years ago, I used a large diameter (I think 1/10" diameter) aluminum grounding wire when I lived in San Jose. We had
Steve, Here's a quicker (time wise) solution to checking materials for corrosion. Take a large plastic container of water and add some rock salt (like we use on the ice and snow here in New England-o
Eric, Assuming you are using the correct type and amount of ferrite beads, the coax type will not change the attenuation one bit. 50 type 73 beads should do OK on 80 and so so through 160 meters. How
Guy, I think if you look back a few years (perhaps 20-25), the whole theory of guy resonances was first mentioned and explored by the late Jim Lawson, W2PV, and I think he provided the info that is n
Ron, I purchase my 1.5" wide copper strap from Metal and Cable Corp. in Twinsburg, OH. There's is slightly thinner than what Polyphaser sells but is more than adequate to do the job and very affordab
Hi Gene, In the early 1970's, I took a direct lightning hit in the middle of San Jose in the Santa Clara Valley where lightning is a rare occurrence. Among the many blow outs were an aluminum ground
Howard, Antennas like the CC X9 are difficult to model since there are traps in the directors. Furthermore, this antenna was discontinued some time ago so it's sort of a nearly dead issue. 73, Joe W1
Jim, Something must be wrong. I've been using the Ham M series since later 1950's and all the later models. They all fit 2" (and perhaps slightly larger) masts using 2.375" c/c U bolts. The Tailtwist
Bert, One caution. The resonance method of of measuring inductance, while often OK for normal work, does not consider the effects of inter-winding capacitance. Hence, depending on the spacing of the
Hi Jim, I hope we haven't been confusing things with the so called tilted LPDA's. LPDA design is quite different than Yagi design. Each element is split and there are two hot booms placed in the same
Pete, Best bet for power line induced lightning surge is to add an in-line inductor between the power company and the MOVs. I gave details on same (and may other tips on preventing lightning damage f
Dan, Today we had an ice storm in good old New England. My 40 meter Hex beam in its usual shape used to look like an inverted umbrella facing upwards. Now it's a mass of wires and fiberglass poles fa
Nat, A few years ago I designed a 7 element 10-meter Yagi for KC1XX which they have up at 35 feet (I believe) and it is often their 10 meter antenna of choice to Europe in the contests. 73, Joe, W1JR