I am looking for some advice or references on how to calculate and/or measure the inductance of a loading coil. I have been modelling a loaded yagi (for 80m) and know the reactance I require for the
The recent thread on 4 sq. vs Yagi on 80m got me thinking about my own experience and the importance of surrounding ground conditions. (I cannot compare my 80m 2 el Yagi with a 4 sq., since I don't h
Don: See here at my web-page...I have detailed photos, turn count and diameters of original coils. I also show details of my high-Q air-wound equivalent coils which will work as exact replacements Go
....oops...direct link for the Cushcraft coil data here: http://www.qsl.net/ve6wz/CC_coil.html De steve ve6wz. _______________________________________________ See: http://www.mscomputer.com for "Self
Bill: This may not be the solution you are looking for....but: Put both elements back pointing the same direction. Shorten all the elements on the 20 the same amount to bring it back to resonance. Th
I think sometimes we go "overboard" with this interaction issue. Using any modeling program, start with a dipole and then introduce another wire and TRY to make a pattern. Only when the second wire i
Also, I have seen six US Towers that have the motor driving a worm drive which in turn drives a chain that drives the cable drum. One of the 89 foot towers came down on me when the chain broke - a $1
Larry: On my US tower 89 footer, I have a homebrew 210 lb 2el 80/40m Yagi and an F-12 high band yagi. My tower goes up and down about 5 times a week since I park the tower down unless I'm QRV. The mo
Alex: Go here for a complete .pdf file on the CC XM-240....same antenna as the 40-2 cd: http://www.cushcraft.com/support/pdf/XM240.pdf , or go here for the main page of all CC antenna manuals: http:/
Blake: It is just a current balun made from small teflon coax wound on a torroid core. Want to see a picture of the inside ?? Go here: http://www.qsl.net/ve6wz/CCbalun.htm De steve ve6wz. http://www.
Stew: The answer is YES....I have removed the capacity hats from the yagi and extended the element tips to compensate by adding some small AL tubing tips. At first I left the hats on, but early this
Pat: Try cranking up a HDX-589 with the raising fixture...very hard indeed. My solution...pay some young kid $20. I'm interested to know of other ideas too...I needed to lower mine this summer to PM
Doug: I found that my XM-240 when tuned for around 7.063 was useable from 7.000 to 7.250. I'm not sure you would really need a switch box. BTW...the bandwidth of this Yagi is so broad mostly because
John: This past summer I replaced all the cables on my HDX-589. This was only a PM job...nothing was wrong, but it has been over 6 yrs, so I thought I should change them. I found US tower to be very
Bill: I have some data and photos of the original coils here: http://www.qsl.net/ve6wz/CC_coil.html These coils are very simple to re-build or repair. de steve ve6wz. http://www.qsl.net/ve6wz/index.h
Tom: I have shunt fed the US tower HDX-589 for many years with no trouble. The metal-to-metal section contact and lift cables appear to provide adequate conductivity. In my case, I have a 2 foot alum
Well Steve, I don't "think" it's easier, I KNOW it's easier !! As for being "installed" properly, well maybe you've never built your own antenna. Installing a commercial antenna may be one thing, but
Rob: Living on a city lot with a 2 el 80-40m Yagi on the tower makes it best to keep my tower DOWN except when QRV. The neighbors sure appreciate it, and for that matter so do I...to a Ham the Yagi m
Roger... Well ok, I guess that makes some sense. However...I can wait the 4 minutes till its at full height (100'). Truth is, in 2 minutes the tower is at 50 feet and is still "good-to-go" If I'm at
Kelly: Don't forget about the driven element. That driven element may have a DC ground through the coax shield, but the current balun can get real hot carrying the 160m RF !! A WORD OF CAUTION when s