I've observed that 2 verticals on 20 meters 800 feet apart fade in and out independently. Rick N6RK _______________________________________________ See: http://www.mscomputer.com for "Self Supporting
I have a 230 foot diameter wire grid ground screen. I tried building a 40 meter ground warmer dipole about 15 feet above it. I didn't see any measurable improvement with signals received vs a 30 ft h
The key problem is dirty transmitters, as opposed to receiver overload. You can afford an extra 6 or 10 dB of receiver front end loss due to filtering to fix receiver overload. On the transmit side,
I'm looking 100 kHz is less than 1% BW on 20 meters. If you can manage an unloaded Q of (quite difficult, but doable), you will lose about 1 dB per resonator. Let's say this filter covers 14000 to 14
I was considering that beam too, until I realized that it has less than 1 dB of gain* over a 4 element SteppIR that covers all those other bands. The boom length of those beams is in a region where g
I just bought a used crank up tower that was set up with a General TIC ring rotator at the top of the 3rd section. There was a beam there and another at the top. The rotator has inserts that stick in
The N2PK analyzer uses a heterodyne system that should much less susceptable to BCI. That is the ultimate solution to this problem. Rick N6RK _______________________________________________ See: http
Cupertino has a 12 inch width limitation, which is just enough for Rohn 25. Basically, that limits you to guyed towers or self supporting pipe towers. A 55 foot Sky Needle would be perfectly legal. I
Well, when they were available, few people took advantage of them. Instead, they saved money and used an MA-550 and cranked it down when the wind came up. Perhaps US Tower would be willing to make a
The big bertha posting, I suspect was for humor. But it is interesting to observe how many zoning problems could be solved by throwing money at the problem. I know of a case where a ham who paid $1
Also, does anyone know how the tower is supposed to pivot when using those fixtures? One simple possibility is just using a pair of ordinary bolts, but it would seem that would screw up the threads a
I just looked over the calcs on the HDX-5106 and I would estimate that it is not capable of 90 MPH cranked up (extrapolating from 50 and 70 MPH numbers). That is why IMHO they won't do the 90 MPH cal
I bought an aluminum cutting blade for my circular saw from McMasterCarr. I have used it in both my table saw and miter saw. In place of thicker slots, you can cut more of them. I've used as many as
Turns out you can't consider the phone line as a lumped component even to get audio to the CO; moreover, the characteristic impedance is complex. This is why the phone company has to use loading coil
The 7MHz antenna is a My 7 MHz vertical is a dead heat against an inverted vee at 90 feet and my 3.5 MHz vertical blows away an inverted vee at 60 feet. Both .25 wl verticals are over extensive groun
I have a Lightning Bolt quad and a 4 element SteppIR. My experience is the same, the SteppIR is way more directive than the quad. Before the quad, I had a KT34. It was also more directive than the qu
A possible reason would be that IBC-2000 might be a stricter spec, and the tower is not engineered to meet that spec, at least with a usable antenna area on top. Does anyone know if IBC-2000 is a ti
You can get ring rotators that mount via pegs that insert into the top of an intermediate section, (the vertical tubes of most crankups are hollow). I have one that came with a tower I recently acqui
I've long thought we should advance the above argument. Hams invest a lot of their own time and money to provide a free-to-the-pubilc communications infrastructure in time of emergency. If ham radio
Not necessarily. Some BPL schemes use the power lines to get to a local WiFi point, and then use WiFi to the home. A hybrid scheme. Example: AT&T Menlo Park. Rick N6RK ______________________________