Loading ...
Sorry, an error occurred while loading the content.

14857Re: AW: AW: [SDRSharp] ebay antenna

Expand Messages
  • jdow
    Jun 24, 2014
      Such an antenna is likely to be quite large. So cheap is not an option.

      {o.o}

      On 2014/06/24 20:54, MCH mch@... [SDRSharp] wrote:
      >
      >
      > Wish I could find an inexpensive LP antenna for 30-900 MHz...
      >
      > Joe M.
      >
      > On Jun 24, 2014, at 6:43 PM, "Ken Alexander k.alexander@...
      > <mailto:k.alexander@...> [SDRSharp]" <SDRSharp@...
      > <mailto:SDRSharp@...>> wrote:
      >
      >> Speaking of inexpensive scanner antennas, Kent Britain WA5VJB makes several
      >> excellent wideband log periodic directional antennas on printed circuit
      >> boards. I have a model that covers continuously from 400 to 1000 MHz. It
      >> costs U.S. $28 and works very well for 4xx and 8xx MHz public service
      >> monitoring. It covers the digital TV bands as well, although I haven't tried
      >> it there yet. It's roughly 12" x 12". http://www.wa5vjb.com/index.html
      >>
      >> Build it Yourself -- While you're there, you should also visit
      >> http://www.wa5vjb.com/references.html and read the article Planar Disk
      >> Antennas for Ultra Wideband Applications for a description of an antenna that
      >> covers from 144 MHz to 1296 MHz and everything in between. Read the article
      >> then note that if you make the disks a little larger it will work better on
      >> frequencies below 144 MHz. Simple to build.
      >>
      >> Hope people find this of some interest!
      >>
      >> 73,
      >>
      >> Ken Alexander
      >> VE3HLS
      >>
      >>
      >> On Tuesday, June 24, 2014 5:38:29 PM, "Ken Alexander k.alexander@...
      >> <mailto:k.alexander@...> [SDRSharp]" <SDRSharp@...
      >> <mailto:SDRSharp@...>> wrote:
      >>
      >>
      >> Seems to me I read somewhere that one of the advantages of silver is that not
      >> only is it a good conductor, but the oxide (tarnish) coating that forms is an
      >> equally good conductor. I'm going from memory, so feel free to shoot down
      >> this assertion if you know better. *:) happy
      >>
      >> Gold of course doesn't oxidize. Another great reason it makes a good contact
      >> material.
      >>
      >> 73,
      >>
      >> Ken Alexander
      >> VE3HLS
      >>
      >>
      >> On Tuesday, June 24, 2014 5:32:16 PM, "Ken Alexander k.alexander@...
      >> <mailto:k.alexander@...> [SDRSharp]" <SDRSharp@...
      >> <mailto:SDRSharp@...>> wrote:
      >>
      >>
      >> It reminds me of what I have read about the Yaesu ATS-100/120/120A mobile HF
      >> antenna. It has been fairly widely reviewed on eHam.net <http://eHam.net>,
      >> almost 300 reviews. I figure only about 10% of ham equipment owners post
      >> reviews on eHam.net <http://eHam.net>...so Yaesu has sold a lot of them at
      >> $300+ each.
      >>
      >> People are generally happy with them, but they seem to suffer from reliability
      >> problems, so there are a number of low ratings that drag down the average
      >> ratings shown on eHam. Those who haven't had reliability problems love them!
      >>
      >> Interestingly, K0BG a U.S. ham whose main interest is mobile HF operating has
      >> built a very comprehensive website on the subject says more than once that the
      >> ATS-100/120/120A is the least efficient mobile HF antenna available at any
      >> price and that it should be avoided. Read here:
      >> http://www.k0bg.com/antennas.html. (Anybody interested in mobile HF operation
      >> would do well to spend an evening or two browsing through K0BG's website).
      >>
      >> Moral: People spend a lot of money on antennas that doesn't work so well (and
      >> aren't built so well) made by a company that has the know-how and resources to
      >> do much better. But they're happy with them because a) it's their first
      >> mobile antenna and they have nothing to compare it to, or b) it's better than
      >> what they had. Compare that to our EBay seller who may or may not have a good
      >> grasp on the theory behind how his scanner antenna works, but sells plenty of
      >> them to 600+ satisfied customers.
      >>
      >> Sorry for rambling on like that! There's a point in there somewhere!
      >>
      >> 73,
      >>
      >> Ken Alexander
      >> VE3HLS
      >>
      >>
      >> On Tuesday, June 24, 2014 4:48:11 PM, "'siegfried jackstien'
      >> siegfried.jackstien@... <mailto:siegfried.jackstien@...>
      >> [SDRSharp]" <SDRSharp@... <mailto:SDRSharp@...>>
      >> wrote:
      >>
      >>
      >> > construction techniques on the Internet, realized they weren't difficult
      >> > to build and saw an opportunity.
      >>
      >> Yepp ... 27k opportunity :-)
      >>
      >> It probably is better than what he and
      >> > many of his customers were using before, so his antenna deserves to be
      >> > called a success.
      >> >
      >>
      >> If he really sold some pieces of pvc tube with hand-wound coils for that
      >> money ... yepp success ... as minimum moneywise for him
      >>
      >> Performance on the frequency range??? Who knows what frequency it is built
      >> for?!?
      >>
      >> Dg9bfc
      >>
      >> Sigi
      >>
      >> Ps you said "I`d wish I thought of it!" ... you still can do better maybe!
      >>
      >>
      >>
      >>
      >>
      >>
      >>
      >
      >
      >
    • Show all 98 messages in this topic