I've been looking at various tower specifications, and often see something like this Maximum Wind Load 70 MPH 15 sq. ft. I don't really understand how to interpret this. I think a wind load is a (sta
OK, so in my example if the maximum wind load at 70 MPH is 15 sq ft, and we have 30 pounds per square foot, that works out to 450 pounds of force. That sounds reasonable. If we believe the force grow
Well, that is substantially less than the 450 pounds I came up with from the "30 pounds per square foot in a 70 MPH wind" rule mentioned upthread. I suppose this is due to uncertainty in the drag coe
On the subject of cables ... I have a very nice coaxial stripper for RG-6/59 that you basically clothespin onto the jacket, spin around the cable a few times and it cuts the jacket, braid and dielect
For RG6/59 and CATV connectors (F connectors) I bought tooling from solidsignal.com that I'm happy with. I especially like the Digicon F connectors. One word of caution about those: don't try to inst
Quoting the Wall Street Journal article dated Feb 22, 2010: "RadioShack Corp.'s (RSH) fourth-quarter earnings surged 26% as the retailer's stronger emphasis on cellphones resonated with consumers." S
True, and some big contesters made their fortunes in the cell phone business (e.g. K3LR). Nonetheless, before there was a Radio Shack (proper noun), hams operated from stations located in radio shack
Just goes to show you how a good reputation, once lost, can be very hard to recover. -- Charles M. Coldwell, W1CMC "Turn on, log in, tune out" Winchester, Massachusetts, New England (FN42kk) GPG ID:
What do people like for roof top antenna mounts? I'm thinking about putting up an HF tri-bander. -- Charles M. Coldwell, W1CMC "Turn on, log in, tune out" Winchester, Massachusetts, New England (FN42
I've heard of/read about people who put television antennas (for receiving OTA broadcast TV) at the top of towers that are also used for HF antennas. Does this risk blowing out the receiver in the TV
Watch out for the volcanos. 73 de W1CMC (living in a state whose trees are being devastated by the Asian Longhorn Beetle). _______________________________________________ ____________________________
What frequencies are they using that are so susceptible to weather and foliage? I've heard similar complaints about DBS television on the Ku/Ka bands. The old BUD satellite systems were on C band whi
I think the water-vapor absorption line is at 22.2 GHz, and that this also marks the boundary between Ku and Ka (under and above, get it?). So their downlink is a bit close, but I don't know how broa
2.4 GHz is in the ISM band. The water line is at 22.2 GHz. -- Charles M. Coldwell, W1CMC "Turn on, log in, tune out" Belmont, Massachusetts, New England (FN42jj) GPG ID: 852E052F GPG FPR: 77E5 2B51
Actually, I should have known to look in Wikipedia. Quoting their "K band" article: "The IEEE K band is a portion of the electromagnetic spectrum in the microwave range of frequencies ranging between
Pshaw. What about Philippe Petit walking a tight rope between the twin towers of the World Trade Center (RIP) in 1974? http://www.manonwire.com/ It seems there are people on this planet who are simpl
I think his primary claims for fractal antennas these days are that they are both compact and broadband. They are probably also inefficient, like all the other sub-wavelength size antennas out there.
MOVs typically have too high capacitance to be used at RF (it low-passes the signal). -- Charles M. Coldwell, W1CMC "Turn on, log in, tune out" Belmont, Massachusetts, New England (FN42jj) GPG ID: 85
You can get spark gaps (aka gas discharge) that will conduct as low as 90V. Its a might higher voltage than a MOV, but like I said upthread, MOVs have too high capacitance for RF. -- Charles M. Coldw
I recently bought a house that has the main electrical panel at the front (grounded to a water pipe) and had (past tense) both OTA and satellite TV coax coming from the antenna/dish through the back