Those are the counterpoise for the antenna and increases the
efficiency of the antenna.
Burt, K6OQK
At 08:33 AM 8/23/2012, time-nuts-requ...@febo.com wrote
What are those rays spreading from the tower base? Are they the artificial
ground plane made by wires?
On Thu, Aug 23, 2012 at 3:15
In message aanlktikgjbl4yvpifgp8edfqfiracaarmxhi5jqso...@mail.gmail.com, paul
swed writes:
OK now that I can actually receive the 90070 chain in the US. What might be
a better antenna then my whip and preamp?
A big loop and preamp? A tall vertical over a ground plane. Tried 67 ft that
yielded
A beverage at 100 KC must be 10-60 miles?
Granted I have beverages at higher frequency. But at 100 KC it will be far
from directional at any reasonable length.
So I think thats a bit costly.
On Tue, Dec 21, 2010 at 11:33 AM, Bill Janssen bi...@ieee.org wrote:
paul swed wrote:
OK now that I
I remember reading somewhere that the envelope of the LORAN pulses was
shaped to reduce the transmitted BW.
Does anybody have a reference for that, and relatedly, what does the BW of
the antenna have to be? Typically, loops are about 90 KHz to 110 KHz, but
can that be narrowed down?
Best,
-John
In message 53187.12.6.201.2.1292957970.squir...@popaccts.quikus.com, J. Fors
ter writes:
I remember reading somewhere that the envelope of the LORAN pulses was
shaped to reduce the transmitted BW.
The envelope is designed for two things: sensible BW and ease of
production. There is some math
I was more interested in reducing the BW, rather than increasing it.
Years ago, I bought up some of the resuidual of Appelco, a New Hampshire
LORAN company that made units for Raytheon. Included were a bunch of
active tunable filters, designed to tune out interference. However,
there is no
John I believe that it is usable certainly from the pre-amplified whip that
I picked up 90070 last night on.
The downside is you have to be awake at 0300. One of those nights.
As I mentioned my GPS comparison was not very good because I forgot to
rehook the gps antenna up to the hp3801. Do.
In message aanlktimsqshe+yehhhydw2v2edj855sszt78mpqch...@mail.gmail.com, paul
swed writes:
Is there a real advantage to a 4 or 6 foot big loop compared to a small
loop?
I use a 3 foot loop on wwvb/preamp and that works well.
There is a very good and simple explanation of the theory behind
loops
Thanks will read the link. Think I have in the past but did not have a need.
I might guess 4 db would be quite helpful in this effort.
I still have some garbage I am seeing that I will need to hunt down. But its
not within the house so that really makes things interesting.
On Tue, Dec 21, 2010 at
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In message [EMAIL PROTECTED], Didier Juges writes:
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Poul,
I should have remembered, as I now recall seeing your page (duh!), thanks!!!
Do you know the
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In message [EMAIL PROTECTED], Didier Juges writes:
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OK, thanks for the useful information . I thought you might have resonated
the loop to get some filtering
of precise time and frequency measurement
Subject: Re: [time-nuts] LORAN-C antenna
A loop antenna is more or less flat until the stray
capacitance of the loop windings take it down.
I put a low-pass filter which cuts around 300-500 kHz on this
one, because I have a MW transmitter at 1062 kHz
@febo.com
Sent: Wednesday, November 14, 2007 2:24 AM
Subject: Re: [time-nuts] LORAN-C antenna
In message [EMAIL PROTECTED], Didier Juges
writes:
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Poul,
I should have remembered, as I now recall seeing your page (duh!),
thanks
2007 03:02
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] LORAN-C antenna
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Hello Didier,
I am using a commercial active whip antenna, McKay-Dymek model DA100A.
It is outside on a tripod, about 12
That last shot looked a little better. It's a tough thing to see on an
SA - being just groups of pulses. It takes max-hold a little while to
build things up with a digital display.
-Carl
On Mon, 2007-11-12 at 22:23 -0600, Didier Juges wrote:
___
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Bill is correct - 10V should do it; these couplers were fed DC up the
coax with ~10mH of choke from a circuit that could detect whether the
load of the amplifier was present or shorted (essentially open and
short DC antenna
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Didier Juges said the following on 11/12/2007 10:48 PM:
I have tried to listen with my HP 3586 and my 80 meter antenna (which is
actually about 20m long and 50 feet up at one end, 30 feet up at the other
end), but I have
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Didier Juges said the following on 11/12/2007 11:02 PM:
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I get this (see picture) with the spectrum analyzer and my wire antenna.
That looks a lot
Didier Juges wrote:
Is it possible to build a Loran antenna?
Yes.
For my Austron 2100 I built an active ferrite rod antenna which works
very well. Much better than an active rod since by using the magnetic
field component, it rejects a lot of the local interference (tv
timebases and
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In message [EMAIL PROTECTED], Dan Rae writes:
I filled a ferrite rod (from an old BC receiver) with a bifilar winding
of wire wrap wire, parallel C to resonate at 100 kHz and the center tap
grounded.
For Loran-C too much
]
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Subject: [time-nuts] LORAN-C antenna
Speaking of Loran, I have an old Loran receiver (origin forgotten) and no
antenna.
Is it possible to build a Loran antenna?
I understand Loran uses narrow pulses of 100 kHz, so
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Speaking of Loran, I have an old Loran receiver (origin forgotten) and no
antenna.
Is it possible to build a Loran antenna?
I understand Loran uses narrow pulses of 100 kHz, so the antenna must have
sufficient bandwidth to
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You're probably pretty close to the Jupiter, Florida station. A piece
of wire will probably do the trick.
John
Didier Juges said the following on 11/12/2007 07:11 PM:
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DJ,
Actually, you are closest to the Malone, FL LORAN, about 30 miles due
south of Dothan, AL. They run 800kW into a 700 foot monopole array. For
more info see http://www.uscg.mil/d8/lorstamalone/default.asp .
--Mike
] On Behalf
Of Mike Niswonger
Sent: Monday, November 12, 2007 7:59 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] LORAN-C antenna
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DJ,
Actually, you are closest to the Malone, FL LORAN, about
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You can build your own LORAN-C antenna coupler without too much trouble.
A lifetime or so ago, I was one of the analog design team at the company
that made Northstar LORAN-C receivers for marine and aircraft
navigation. The
Hello Didier,
I am using a commercial active whip antenna, McKay-Dymek model DA100A.
It is outside on a tripod, about 12' to the base. Very broadband and
omnidirectional.
I use for VLF RX on 137 and 185 KHz as well as RX during HF FMTs.
A resonant magnetic loop antenna may have enough bandwidth,
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Is it possible to build a Loran antenna?
Sure. There are plenty of plans out there or LF, mostly loops, diamonds,
squares and E-probes. Try google. If that doesn't work, I'll chase down
the set of links I have.
I built a
PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Daun Yeagley
Sent: Monday, November 12, 2007 7:51 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] LORAN-C antenna
Didier, that ought to be just about in your back yard!! I did
some consulting for one
the tower :-)
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Carl Walker
Sent: Monday, November 12, 2007 8:31 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] LORAN-C antenna
You can build your
:[EMAIL PROTECTED] On Behalf Of Didier Juges
Sent: Monday, November 12, 2007 10:02 PM
To: [EMAIL PROTECTED]; 'Discussion of precise time and frequency
measurement'
Subject: Re: [time-nuts] LORAN-C antenna
I get this (see picture) with the spectrum analyzer and my
wire antenna.
That looks a lot
of precise time and frequency measurement
Subject: Re: [time-nuts] LORAN-C antenna
You can build your own LORAN-C antenna coupler without too
much trouble.
A lifetime or so ago, I was one of the analog design team at
the company that made Northstar LORAN-C receivers for marine
and aircraft
); SAEximRunCond expanded to false
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In message [EMAIL PROTECTED], Didier Juges writes:
); SAEximRunCond expanded to false
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Speaking of Loran, I have an old Loran receiver (origin forgotten) and no
antenna.
Is it possible to
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