Dan/Hans, I cannot imagine building another antenna with parasitic elements mounted to an aluminum plate with the elements electrically connected to the boom and haven't made one that was connected i
Here is the scoop on freight rates. They have published list prices, and then they have contracts with companies that include discounts - up to about 90% off those rates. Even when I owned a small co
If anyone has an EZNEC file for a two element Triband Quad (20/15/10) I would appreciate it if you could share it with me. I will play with the boom length, wire gauge, etc and optimize it for my pur
I have four 60 foot 25G towers that have a solid rod of fiberglass in each leg. These towers were in guyed for several years in a pretty harsh environment on top of a mountain. After having grade. 8
Gordon, No, sorry for misunderstanding. Here is what I said regarding the 3/8 rod... "After seeing the towers bend in about a. 60 mph wind, I used 3/8 fiberglass rod to guy them to small, homemade an
John, I have no idea. What I do know is there is not a lot of wind load on a 60 foot tower with no antennas on it and that it would take a tremendous amount of force to break a single four inch long
You can buy 2.75 OD x .120 wall tubing from DX Engineering. The inside diameter will be 2.510 giving you ten thousandths clearance to over sleeve the joints. http://www.dxengineering.com/parts/dxe-at
I would say if you have to guess which way a strong wind will blow and try to figure out whether a tower will be stronger in one orientation versus another in order to sleep better the plan is margin
These discussions are interesting but the bottom line appears to be Paralysis from Analysis in many cases. Everything you do is a risk. Use a little common sense and do something! About a decade ago
John, Before deciding it isn't going to work and doing something different, I would try it first with some top loading wires and a shunt feed. I would highly recommend not using it as a support for a
I also have trouble contemplating having a big wad of heavy cores hanging from the driven element of a large Yagi where the driven element may be 30 feet or more from the mast. Reading K9YC material
Wondering if any mechanical engineers out there could calculate this: If you had 60 feet of 2 inch OD x .125 wall 6061-T6 (held solid at one end) how much rotational torque (foot pounds?) at the othe
Thanks to Jim Lux (call?), K5GW, and KZ1W for responses to my question. I may rethink the way I accomplish what I want to do. Jim - can you tell me the input parameters you used in that calculator an
If every antenna were compared to every other antenna in terms of free space gain and all in the same unit of measure (say dBI) and if the numbers for gain F/B, F/R, etc were shown as average across
I'm talking about 350 numbers averaged, for example covering the 20 meter band - not averaging two numbers like 10 and 20 dB and I'm suggesting that because an antenna can have in excess of 60 dB of
Steve, In your unlikely example it would be 15 dB. I think it would not be possible to design an antenna such that the F/R changed by 10 dB in one KHz on the HF bands. I certainly would not want to s
I admire someone who has the most for the least expenditure. There are a few who have unlimited budgets and can afford store bought everything. There are many more who try to make the most with a li
Herb, Assuming the tower is guyed, seems to me the easiest thing to do would be to use a short flat top section on the 45G and a flat base plate for the 25G and just bolt them together with a few bol
Another alternative: Drill about a 5/16 inch through hole in the PVC about 1/2 to 1 inch down from the end and then cut a slot about the width of the wire diameter between the top of the holes and th
Doug, Thanks for the contact in 160m Contest. I was ZF2DX that weekend. .05 = 1/20 but VE7RF, for some reason, calculated a half wavelength instead of a wavelength and then divided by 10 instead of 2