Rolfe, I have seen a lot of interest over the last few days on the Radio Shack units. I purchased two of them about a month ago and was quite disappointed. Both were very poor on power calibration (
Barry, Sorry to hear about your damage. I have been struck with varying degrees of damage about 5 times. Once on an ungrounded vertical (ground rod was installed, just hadn't hooked it up!!). Once o
The horizontal forces in the guys are ALWAYS equal--the tower moves until the forces are balanced. Assuming that the guy spacings are equal from the three directions then you only need to get the tow
The Anixter catalog shows Raychem Heat Shrink tubing going up to 2.7 inches ID and they may not show all of the sizes available directly from Raychem. These tubings are available with or without a s
The amount of RFI produced by fluorescent fixtures is closely related to the quality of the ballast transformer and therefore to the price. Good quality fixtures usually don't emit enough RFI to be p
Seems like I saw a piece on how to disassemble and rebuild Hy-Gain traps somewhere. Any idea where to send me to retrieve a copy? Never figured I'd do any trap rebuilding or even use tribanders, but
not re There are two main scenarios that degrade the pattern of Yagis. First is any conductor near resonance anywhere in the area of the antenna and in a plane to interact. The second is from any co
Bill (and the others who have expressed interest in 10M EME) Let me just give you a little better idea about signals on 10M EME to illustrate what it takes. Yes, I have a tape with some echoes that
Assembling a TH-7 from a TH-6 and junker pieces from a TH-2. Notice that the only dimensions in my old TH-7 manual are for phone--in fact you could probably say HI-phone. Are there any dimensions for
Phil, here is my response to someone else with a similar requirement. Should work for you as well--actually I added a few words to make my original answer a little more detailed. 73 John W0UN -- You
Phil, You can pick up the G-10 at most plastics supply houses. Cadillac Plastics is one chain that comes to mind. Any local machine shop will also be happy to make them for you. With a need for 40-60
I received a lot of request for copies of any info I received concerning retuning the TH-7 to lower frequencies. I'll just summarize and include the reply from Roger Cox at Hy-Gain as an appendix. Th
Frank, look in your Yellow Pages under Trucking Transportation Brokers and try a few. I have shipped little stuff all the way to shipboard containers this way. But you won't have the same insurance
I would add "lightening" to the list as well. Seems that over 50% of the writers don't know how to spell lightning. Although "lightening" used in the context of bleaching your clothes used for antenn
My old Rohn book shows the DEPTH "D" in the first column of the chart (drawing C620643) and the block number is the depth in feet, ie "4d" anchor is 4 ft down, the "6b" anchor is 6 ft down, etc. By
Minimize the error at the highest frequency by cutting to that length, since a couple of feet error on the lowest frequency is a smaller part of a wavelength percentagewise. But please note --CATV l
In most situations I recommend direct burial without conduit. My experience with 100,000 ft of buried hardline (radio astronomy observatory) was that the only places that had problems were where a p
Yep, I mean hardline--basic foam-filled 7/8 inch, 100 ohm stuff that was surplus. Not all radio astronomy is at microwaves. We did a lot of HF and low VHF radio astronomy--primarily Jupiter--Io effec
The potential difference depends on where the two points on the radials were touching and the phase difference in the feed system. The radials are not on the ground and are not a "ground plane". The
I know someone who did this and when the county authorities saw the sign the quarantined off the property until he could get it all straightened out. Microwave RADIATION from ovens is pretty scarey t