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OT K0BRA Active Antennas AMRAD

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stephen Farthing

OT K0BRA Active Antennas AMRAD

Greetings from England,

I wonder if anyone can help me get access to the AMRAD Website. I am
about to start building the K0BRA Active RX Antenna as featured in the
Sept 2001 QST and I am interested in getting the documentation at : -

www.amrad.org/projects/lf

however Firefox and MS Explorer cannot get access, the former thinks I
should be using HTTPS, the latter just shows a blank page.

Of course if those fine and talented Engineers at Elecraft produced a
kit for an active antenna I would not have to bother using the AMRAD
design....(Hint hint). In all seriousness with the number of SWLs and
antenna restrictions around there could be a big market for just such a
kit.....I want mine to do some listening with what I am away on business
trips...

Thanks ...

Steve G0XAR

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Dave Sublette

Re: OT K0BRA Active Antennas AMRAD

Internet Explorer thinks it's a blank page also....K4TO

Stephen John Farthing wrote:

> Greetings from England,
>
> I wonder if anyone can help me get access to the AMRAD Website. I am
> about to start building the K0BRA Active RX Antenna as featured in the
> Sept 2001 QST and I am interested in getting the documentation at : -
>
> www.amrad.org/projects/lf
>
> however Firefox and MS Explorer cannot get access, the former thinks I
> should be using HTTPS, the latter just shows a blank page.
>
> Of course if those fine and talented Engineers at Elecraft produced a
> kit for an active antenna I would not have to bother using the AMRAD
> design....(Hint hint). In all seriousness with the number of SWLs and
> antenna restrictions around there could be a big market for just such
> a kit.....I want mine to do some listening with what I am away on
> business trips...
>
> Thanks ...
>
> Steve G0XAR
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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David A. Belsley

Re: OT K0BRA Active Antennas AMRAD

In reply to this post by stephen Farthing

Steve:
Instead of using http://www.amrad.org/projects/lf, use https://
www.amrad.org/projects/lf. It should then work.

best wishes,

dave belsley

On Mar 4, 2006, at 4:31 PM, Stephen John Farthing wrote:

> Greetings from England,
>
> I wonder if anyone can help me get access to the AMRAD Website. I
> am about to start building the K0BRA Active RX Antenna as featured
> in the Sept 2001 QST and I am interested in getting the
> documentation at : -
>
> www.amrad.org/projects/lf
>
> however Firefox and MS Explorer cannot get access, the former
> thinks I should be using HTTPS, the latter just shows a blank page.
>
> Of course if those fine and talented Engineers at Elecraft produced
> a kit for an active antenna I would not have to bother using the
> AMRAD design....(Hint hint). In all seriousness with the number of
> SWLs and antenna restrictions around there could be a big market
> for just such a kit.....I want mine to do some listening with what
> I am away on business trips...
>
> Thanks ...
>
> Steve G0XAR
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

Bob Nielsen

Re: OT K0BRA Active Antennas AMRAD

In reply to this post by stephen Farthing

On Mar 4, 2006, at 1:31 PM, Stephen John Farthing wrote:

Have you tried using <https://www.amras.org/projects/lf>? That works
for me (using Safari).

Bob, N7XY

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roncasa

K0BRA Active Antennas AMRAD

In reply to this post by David A. Belsley

Nope, neither works!
Ron wb1hga

David A. Belsley wrote:
> Steve:
> Instead of using http://www.amrad.org/projects/lf, use https://
> www.amrad.org/projects/lf. It should then work.

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David A. Belsley

Re: K0BRA Active Antennas AMRAD

You will have to manually add the "s" to the end of http in the
address bar. If you just click on a URL, it will not supply the "s".

best wishes,
dave belsley

On Mar 4, 2006, at 4:57 PM, ron wrote:

> Nope, neither works!
> Ron wb1hga
>
> David A. Belsley wrote:
>> Steve:
>> Instead of using http://www.amrad.org/projects/lf, use https://
>> www.amrad.org/projects/lf. It should then work.
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

David A. Belsley

Re: K0BRA Active Antennas AMRAD

In reply to this post by roncasa

Actually, Ron, the reason it was not working is that I have
inadvertently placed in my first message a space between the // and
the www. So clicking on the URL only picks up the www part and
supplies the http://, which doesn't have the additional "s".

dave

On Mar 4, 2006, at 4:57 PM, ron wrote:

stephen Farthing

Re: K0BRA Active Antennas AMRAD

In reply to this post by David A. Belsley

Hi all....
It was a feindish trick...the URL in the QST article does not
exist......This one however does

https://www.amrad.org/projects/lf/

thanks for the help.....

Steve G0XAR

PS Does anyone else think Elecraft could find a market for a high
performance active antenna kit?
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Tom Hammond-3

Re: K0BRA Active Antennas AMRAD

In reply to this post by roncasa

It will work if you put the two (slightly separated) pieces together into:

https://www.amrad.org/projects/lf

Just went there with no complaints.

73,

TOm N0SS

At 03:57 PM 3/4/2006, you wrote:

>Nope, neither works!
>Ron wb1hga
>
>David A. Belsley wrote:
>>Steve:
>> Instead of using http://www.amrad.org/projects/lf, use
>> https://www.amrad.org/projects/lf. It should then work.
>
>_______________________________________________
>Elecraft mailing list
>Post to: [hidden email]
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
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>
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>Elecraft web page: http://www.elecraft.com

Don Wilhelm-3

RE: K0BRA Active Antennas AMRAD

In reply to this post by roncasa

It worked with Firefox for me. First has to manually add the 's' to the
URL, then had to accept the sites certificates.

If you cannot access it, you may want to check your security settings on the
browser - if you are set only for valid certificates or certificates from
only the originating site, you will have trouble. Set the certificate
validation in your browser to 'warn' and you will see the messages - if you
set it higher, you will not be able to get to the site.

73,
Don W3FPR

> -----Original Message-----
>
> Nope, neither works!
> Ron wb1hga
>
> David A. Belsley wrote:
> > Steve:
> > Instead of using http://www.amrad.org/projects/lf, use https://
> > www.amrad.org/projects/lf. It should then work.
>
>

Dave Sublette

Re: K0BRA Active Antennas AMRAD

Well after all of the variations of URLs and browsers, I finally clicked
on the Active LF Antenna article and was told "You are forbidden access
to this page....I guess I'm not interested after all :-( ....K4TO

Don Wilhelm wrote:

> It worked with Firefox for me. First has to manually add the 's' to the
> URL, then had to accept the sites certificates.
>
> If you cannot access it, you may want to check your security settings on the
> browser - if you are set only for valid certificates or certificates from
> only the originating site, you will have trouble. Set the certificate
> validation in your browser to 'warn' and you will see the messages - if you
> set it higher, you will not be able to get to the site.
>
> 73,
> Don W3FPR
>
>
>> -----Original Message-----
>>
>> Nope, neither works!
>> Ron wb1hga
>>
>> David A. Belsley wrote:
>>
>>> Steve:
>>> Instead of using http://www.amrad.org/projects/lf, use https://
>>> www.amrad.org/projects/lf. It should then work.
>>>
>>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>

Don Ehrlich-2

Re: K0BRA Active Antennas AMRAD

Why not be interested? It is an interesting project.

I built the active antenna two years ago, not for use with VLF but as an
antenna to use with old broadcast AM radio receivers. I had found that my
old Philco, which was designed to use a random wire antenna, picked up more
hum than than anything else and I needed to place an effective antenna well
above the electric fields existing in my living room and then bring the
signal down to the radio through coax where I could then use a conventional
step up transformer to match the antenna input of the receiver. There are
probably easier ways to make the old Philco perform but I was interested in
the concept of using a short whip, remote amplifier, and coax to suck
signals out of the air. Anyway, it worked well. I found that it was
effective up to about 7 MHz although performance fell off gradually about 4
MHz.

The special power transformer (wound with very low capacitance between
primary and secondary) may be a cost issue. I made my own by stripping the
secondary off a cheap RS transformer and adding a new secondary with a *lot*
of insulation between the two windings to reduce the capacitance to very
near that reported in the qst article for the purchased version of the
transformer.

Don K7FJ

> Well after all of the variations of URLs and browsers, I finally clicked
> on the Active LF Antenna article and was told "You are forbidden access to
> this page....I guess I'm not interested after all :-( ....K4TO

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