Home |
Search |
Today's Posts |
|
#1
![]() |
|||
|
|||
![]() Geoff., Thanks for adding your comments. On Wed, 10 Oct 2007 12:34:08 +0000 (UTC), Geoffrey S. Mendelson wrote: Frnak McKenney wrote: Anyway, thanks for reassuring me that my poor WWV reception really might not be due to a poor antenna design. If I ever come up with a Really Good Solution I'll post back here. What would help you is an outdoor active antenna. For a start look at MFJ's. It's a metal box with an amplifier in it, and a whip antenna. It uses a small box at the receiver end to pass DC up the coax to power it. I looked around and found http://www.mfjenterprises.com/ Their MFJ-1020C looks interesting. For now, though, I think I want to concentrate on getting as much as I can from "bare wire". Placing it outside would help. Placing it outside and away from noise sources, or on the roof would help more. A whip antenna is used because it's a cheap commerical off-the-shelf (COTS) item. It could be replaced with a thin wire. The coax could be replaced with a run of (more expensive) mini-coax. This would make it easier to hide and you may be able to use it. The old GC-1000 had a built-in whip; the GCW-1001 doesn't even have that... just a threaded 50ohm coax connector. If you are handy with building things, there are lots of designs for similar devices, the easiest is a single MMIC type amplfier. It may be more difficult to actually do as they are very sensitive to static. I'll see what I can find. Thanks for the keyword. If all you have is a window, a loop around it would do. If it has a metal frame, and all 4 sides are connected to each other, you can try using it as a loop. If not, thin wire held up by transparent tape, or that metal tape used by alarm systems would work. I like that -- there's a window/storm window about 4' away facing east. As to your other post... On Thu, 11 Oct 2007 00:09:08 +0000 (UTC), Geoffrey S. Mendelson wrote: Frnak McKenney wrote: Not sure what you could be referring to... other than the three computers, 25" monitor, printer, Atmel AVR development board (8MHz clock), flourescent desk lamp, and overhead I-look-like-an- incandescent flourescent helix... all within 3 feet of the antenna and clock. grin! With all that hardware, wouldn't NTP (internet time) be a better option? Or if you are not too deep into steel and concrete a GPS receiver? Both of these would be excellent ways of keeping an accurate time source at hand, and it would be perfectly reasonable to assume that that was what I was trying to accomplish. I apologize for the lack of clarity; let me back up a bit. When I started out, I simply wanted to learn about how antennas worked, how an EM wave made it from point A to point B in a way that would let me... how do I say it? "Fit all the pieces together"? And, as part of that, I was trying to see how well I could take basic principles and make-with-my-hands something that demonstrated that (a) I had understood correctly and that (b) I could actually build something that worked. I'd had the MAC-II around for more than three years, sitting in the background and mildly annoying me because every power hiccup reset the display to its startup "not SEt" text and it could be months before it was running again. Mildly annoying, but I didn't have a serious need to know exactly what time it was. It occurred to me (eventually grin!) that building An Antenna that made the MAC-II a more dependable TOD source would be a Really Good Test Of My Antenna Building Skills... sort of like learning to swim by jumping off a dock. As silly as that may sound, when you're venturing into unfamiliar territory (and as a consultant, I do a lot of that) there's always a new kind of swimming to learn, and there always seems to be a dock you eventually wind up jumping off if you're going to learn very much. So if it looks like my "stroke" is extremely poor at this point, well, that's likely; on the other hand, I'm not exactly drowning, either. I'm waving my hands in all directions, learning what seems to make me move and what doesn't, and listening to helpful comments from the Peanut Gallery on the dock. Youse guys. grin! Throwing money at the prob... er, "adopting a pre-packaged solution" grin! gets me the Time Of Day -- precise, reliable, hopefully accurate -- but it doesn't help me learn how to swim... er, build antennas. And, besides, my budget is a bit tight at this point, which means no new test equipment... I don't suppose anyone knows how to generate an accurate 10MHz alignment signal by rubbing a 1.5MHz Function Generator and a Tek465 'scope together? grin! Okay... I'm sure that's more than most (all?) of you wanted to know. Please feel free to recycle this post in an environmentally acceptable manner. grin! Frank -- "...in the end, it's simply about telling stories, in conditions that allow me to do my best work. 'The exercise of vital powers along lines of excellence in a life affording them scope,' to quote the Greek definition of happiness." -- J.M. Straczynski ("Babylon 5") on scriptwriting -- Frank McKenney, McKenney Associates Richmond, Virginia / (804) 320-4887 Munged E-mail: frank uscore mckenney ayut minds pring dawt cahm (y'all) |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
What antenna for receiving video signal from ISS ? | Antenna | |||
Need some help designing a receiving antenna | Antenna | |||
Best Antenna for Receiving - NEWBIE | Antenna | |||
Readily available 10MHz divide by 96 10MHz down counter | Homebrew | |||
Readily available 10MHz divide by 96 10MHz down counter | Homebrew |