Active antenna Q
N9NEO
It fits inside a 8" x 1.25" piece of pvc pipe and half of the pc board
is the antenna. It uses a U310 fet and some bipolar following that.
Maybe a 2N5809. Stick it on a non-magnetic pole and the 12v supply is
in the house. I am looking for the link to it. A friend and I are
building them, but I left the documentation at my other QTH. If you
have any experience with it then I would like to hear what you think.
I'm also building the AMRAD active antenna, but the high dollar fets
aren't here yet.
regards,
NEO
r2000...@hotmail.com
I think you are talking about one of Dallas Lankford's active
antennas.
<http://www.kongsfjord.no/>
Look under "The Dallas Files"
He has several different designs.
I think the one you are wanting is in the "Low Noise Active Antenna AC/
DC Power Supplies"
pdf.
Unless you have a world class receiver, the difference between the
simpler antenna
that uses affordable JFETs and the other will be minimal.
I would suggest you give serious though to building the dipole
version.
Much better IMD characteristics.
Terry
Telamon
N9NEO <yzord...@verizon.net> wrote:
Could be the North country active antenna.
<http://www.northcountryradio.com/Kitpages/pactant.htm>
--
Telamon
Ventura, California
N9NEO
wrote:
> In article <1183585474.762205.177...@c77g2000hse.googlegroups.com>,
Not sure. I don't see the schematic on the north country site. I'm
sure thsere are a bunch of good designs out there. I'll post a link
to it when I get back to NY next week. My friend said he was very
happy with the performance and will compare to a couple of other
antennas he has. Maybe I can coax him into writing something down and
publish.
Crystalonics fets got here for the Amrad. The wife thought they were
LEDs so when I asked for fets she told me they didn't come.
NEO
Telamon
N9NEO <yzord...@verizon.net> wrote:
The following link shows a FET amplifier followed by a bipolar
transistor coax line driver. Different FET and transistor than you asked
for though. See page two for the schematic.
<http://www.northcountryradio.com/Published/actant_0896/actant_0896.htm>
--
Telamon
Ventura, California
jstrain4
http://www.northcountryradio.com/Published/actant_0896/page1.htm
Please not the semiconductors have been updated. I have had the antenna
in service in a suburban setting trouble free for more than 1 year
Good buy...Paid extra for them to assemble it for me
yodar in Orlando
RHF
Figures 6 and 7
http://www.techlib.com/electronics/antennas.html
Others :
http://www.amrad.org/projects/lf/actant/faq.htm
http://groups.google.fr/group/rec.radio.shortwave/msg/f2a776b047b3c987
http://www.techlib.com/electronics/antennas.html
http://www.ibiblio.org/pub/academic/agriculture/agronomy/ham/HOMEBREW/20051006.hb
http://www.ibiblio.org/pub/academic/agriculture/agronomy/ham/HOMEBREW/20060306.hb
http://72.14.253.104/search?q=cache:NE1mpiYGKkUJ:www.kkn.net/archives/html/QRP-L/2002-04/msg00507.html+Active+Antenna+U310+fet&hl=en&ct=clnk&cd=5&gl=us
.
MRe
<r2000...@hotmail.com> schreef in bericht
news:1183590466.4...@o61g2000hsh.googlegroups.com...
> On Jul 4, 10:44 pm, N9NEO <yzordder...@verizon.net> wrote:
> > Does anybody know which antenna I am talking about?
> >
> > It fits inside a 8" x 1.25" piece of pvc pipe and half of the pc board
> > is the antenna. It uses a U310 fet and some bipolar following that.
> > Maybe a 2N5809. Stick it on a non-magnetic pole and the 12v supply is
> > in the house. I am looking for the link to it. A friend and I are
> > building them, but I left the documentation at my other QTH. If you
> > have any experience with it then I would like to hear what you think.
> >
> > I'm also building the AMRAD active antenna, but the high dollar fets
> > aren't here yet.
Google for 'Miniwhip'
--
Greetings from Groningen ^top^ of Holland
MRe
RHF
> <r2000sw...@hotmail.com> schreef in berichtnews:1183590466.4...@o61g2000hsh.googlegroups.com...
>
> > On Jul 4, 10:44 pm, N9NEO <yzordder...@verizon.net> wrote:
> > > Does anybody know which antenna I am talking about?
>
> > > It fits inside a 8" x 1.25" piece of pvc pipe and half of the pc board
> > > is the antenna. It uses a U310 fet and some bipolar following that.
> > > Maybe a 2N5809. Stick it on a non-magnetic pole and the 12v supply is
> > > in the house. I am looking for the link to it. A friend and I are
> > > building them, but I left the documentation at my other QTH. If you
> > > have any experience with it then I would like to hear what you think.
>
> > > I'm also building the AMRAD active antenna, but the high dollar fets
> > > aren't here yet.
>
- Google for 'Miniwhip'
>
> --
> Greetings from Groningen ^top^ of Holland
>
> MRe
-INFO on the- PA0RDT "Mini-Whip" {Active} Antenna
http://www.cvni.net/radio/e2k/e2k029/e2k29miniwhip.html
The PA0RDT "Mini-Whip" Active Antenna
-designed by- Roelof Bakker [PA0RDT] that's PA-Zero-RDT
http://www.radiopassioni.it/pdf/pa0rdt-Mini-Whip.PDF
http://sdr-1000.blogspot.com/2006/09/pa0rdt-mini-whip-more-information-and.html
http://www.veron.nl/afd/voorne_putten/Lezing/pa0rdt/pa0rdt-Mini-WhipGeneralDescription%5B1%5D.pdf
http://www.geocities.com/n2uhc/blog.html
- - - Entry for March 2, 2007
http://www.beaconworld.org.uk/beaconrx.htm
PA0RDT-Mini-Whip {Active} Antenna - Inch-per-Inch - It Works !
http://groups.google.com/group/rec.radio.shortwave/msg/dbc4666783b0a2f6?
sometimes . . . smaller can be good - iane ~ RHF
.
.
. .
N9NEO
> On Jul 5, 3:24 pm, "MRe" <m.reneman=geensp...@hccnet.nl> wrote:
>
> > <r2000sw...@hotmail.com> schreef in berichtnews:1183590466.4...@o61g2000hsh.googlegroups.com...
>
> > > On Jul 4, 10:44 pm, N9NEO <yzordder...@verizon.net> wrote:
> > > > Does anybody know which antenna I am talking about?
>
> > > > It fits inside a 8" x 1.25" piece of pvc pipe and half of the pc board
> > > > is the antenna. It uses a U310 fet and some bipolar following that.
> > > > Maybe a 2N5809. Stick it on a non-magnetic pole and the 12v supply is
> > > > in the house. I am looking for the link to it. A friend and I are
> > > > building them, but I left the documentation at my other QTH. If you
> > > > have any experience with it then I would like to hear what you think.
>
> > > > I'm also building the AMRAD active antenna, but the high dollar fets
> > > > aren't here yet.
>
> - Google for 'Miniwhip'
>
>
>
> > --
> > Greetings from Groningen ^top^ of Holland
>
> > MRe
>
>
> The PA0RDT "Mini-Whip" Active Antenna
> -designed by- Roelof Bakker [PA0RDT] that's PA-Zero-RDThttp://www.radiopassioni.it/pdf/pa0rdt-Mini-Whip.PDF
>
>
> http://www.veron.nl/afd/voorne_putten/Lezing/pa0rdt/pa0rdt-Mini-WhipG...
>
> http://www.geocities.com/n2uhc/blog.html
> - - - Entry for March 2, 2007
>
> http://www.beaconworld.org.uk/beaconrx.htm
>
>
> sometimes . . . smaller can be good - iane ~ RHF
> .
> .
> . .
That's the one! Good work RHF.
NEO