Manufacturers of coax cable usually specify a minimum bend radius for cables which are to be installed in a fixed bent configuration. If the bend radius is not specifically called out for the particu
The EIA/TIA-222E Map is available at: http://www.skyenet.net/pirod/wszmap.htm 73, Dave, K1FK Fort Kent, ME -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting
Concrete is a mixture of two components, aggregate and paste. The paste is comprised of portland cement and water while the aggregate is made up of sand and crushed rock. The chemical processes invol
I have a rather large bibliography of reference material and www sites available for TowerTalk subscribers. Due to it's size, I will email the bibliography directly to requesters rather than post to
Does anyone on the reflector have a "tried and proven" mechanical/structural design for a full-sized, SELF-SUPPORTING 80M vertical element? 73, Dave, K1FK Fort Kent, ME -- FAQ on WWW: http://www.cont
There is an on-line calculator available at the National Geophysical Data Center site for determining the Earth's magnetic field parameters for a specific location. http://www.ngdc.noaa.gov/cgi-bin/s
**Use a Collins Coaxial Balun** This was orginally described in the Collins Radio book "Fundamentals of SSB, (2nd edition, 1959). Additional articles appeared in Ham Radio Magazine (February 1980, Ma
Take a look at Times Wire LMR-400 as a replacement for 9913. It has solid dielectric, which avoids the water problems AND bend radius/impedance purtubations reported by some with 9913. They also have
I just received a copy of the R&L Electronics catalog in which they describe Rohn telescoping masts of heights 20, 30, 40, and 50 feet (page 59). Looking in the price list (page 20) I noticed a H70 (
In an word - DON'T! They are very economical to make, will survive any power you can afford to deliver to them, and you don't have to worry about core saturation and arcing when there's ice on your l
The Collins type of balun was derived from the 1/4-wave parallel line balun which has been around for many decades. In the parallel line configuration, it is a narrow-band device and applicable to on
Does anyone have experience and/or advice to offer on use of aluminum self-supporting towers, such as the Universal Tower series, for supporting large arrays such as the Force 12's with 36' to 44' bo