Hi, I too had a TH3, but based on models and Steve's talk at Dayton went to a 2 el, but in a somewhat different manner. I considered the C3S but cost drove me to a semi homebrew solution. I reasoned
Hi Gang, Several of you wrote and asked for more details on my 2 el beam that uses monoband reflectors and a trapped driven element. Here's a short comment on the C3 and the rest of the info on my be
Hi Steve, it's 20 psf, 80 > MPH is about 25 psf. Your analysis doesn't allow for the load using 25#/sq ft) As you can see Steve, I did multiply by the wind pressure (25 psf). My distribution again wa
Hi Hank, These were my calculations Hank, not Steve's. And you're right (gack), I left out the wind pressure from the 40m dipole calc (mea culpa). Revised numbers are: Antenna area (sq ft) Hgt (ft) b
Hi Kurt and gang, Thrust bearings don't have to be so expensive. HamMs are made to support a thousand pounds down thrust so you just need something to take the side thrust. I use a home brew equivale
Hi Paul, --Original Message-- I have a Heights crank up with which I am pleased. They make towers in many configurations from 28 to 116 feet tall with ratings from 5 to 40 sq ft. You might be interes
This is a multi-part message in MIME format. --=_NextPart_000_0024_01BDCC44.74AA4440 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have always used wind
Hi Gang, Using trees as guy anchors has worked well for many (I never heard of a failure). The recommended technique is to drill a hole straight through the trunk and put a long eye bolt through it.
Re bolt torques: The Rohn manual says "Tighten the nut securely, but be careful not to strip the threads." Re base: There were 2 models of 56 foot towers: 1. the light duty AX (top section 10 3/16" a
The 17th ed. Antenna Book shows way to do this on page 8-30 but just shows an "RFC" to isolate RF and DC with no description of the component. It seems that this component would be a little tricky si
Hi Gang, I picked up a Maxcom High Speed Antenna Matcher (per label) at a local auction. I can't get it open and I can't find any ads for it in old QSTs. It has 2 terminals for the antenna and one SO
A QST review was in Nov. '84. It has xray pictures showing power resistors and a scrap circuit board unconnected to anything. QST measured less than 1.4:1 swr from 160m to 6m without any antenna atta