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February 2011

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Subject:
From:
Ahne Oosterhof <[log in to unmask]>
Reply To:
Date:
Sun, 27 Feb 2011 11:02:21 -0800
Content-Type:
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I searched BING for "+Antenna +lf" and found small ready made antennas
covering the band you mentioned for less than $200 and some descriptions of
antennas like those on your ship.
No idea regarding which is best or even acceptably useful.

Have fun,
Ahne.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Sunday, February 27, 2011 10:38
To: [log in to unmask]
Subject: Re: [TN] NTC: GEC BRT 400S

Thanks, Steve & Blair,

the manual is excellent, thanks again. Unfortunately very little about
antennas.
When I look through the 56 ps manual, I realize this is a very advanced
machine for its age. They are said to be one of the best for that time. Just
wonder what they cost then? Nothing for the picnic, weight 75 pounds!

A funny problem: it's almost impossible to get the old copper lines with
porcelain isolators. Whoever I try look at me as being a Neanderthaler. So,
seems as it will be a variable dipol of some kind. From what you say, Blair,
it will be little of  a monster to cover all bands. On the other hand, is
there anything today at kHz bands? Beacons? Navigation buoys? Radio sonds? I
guess  my old receiver will be laughed at by the VHF/UHF/GHZ radios: " Have
you seen, folks, a GEC BRT 400S...ho-ho-ho..it smells of stinky selenium
rectifier and leaking electrolytes. Poor thing, got a frequency range like
an elephant..ho-ho....use capacitors with blades and gear boxes..no, no, not
kidding....and you should see the line transformer...my...weight as a six
feet man...guys...let's help him back to the museum.."

Inge

On 27 February 2011 17:19, Steve Gregory
<[log in to unmask]>wrote:

> Hi Inge!
>
> Haven't heard from you in quite sometime! Glad to hear from you! I have
> your pictures posted:
>
> http://stevezeva.homestead.com/Inge_s_Lab.jpg
>
> You have a nice little lab to work in! Here's your receiver:
>
> http://stevezeva.homestead.com/Inge_s_BRT400.jpg
>
> I know nothing about antennas, but I did find this. I don't know if you
> have a manual for your receiver, but here's one for download:
>
> http://bama.edebris.com/manuals/ge/brt400
>
> But before you can see it, you will have to download this viewer:
>
> http://windjview.sourceforge.net/
>
> It's almost like an Adobe *.pdf viewer
>
> In the manual, it does talk about antennas (they are called aerials in the
> manual) on page 20 and 21.
>
> Steve
>
> -----Original Message----- From: Blair Hogg
> Sent: Sunday, February 27, 2011 10:46 AM
> To: [log in to unmask]
> Subject: Re: [TN] NTC: GEC BRT 400S
>
>
> Inge,
>
> I'll wait for the photos, but an antenna is an antenna. It can either be
> resonant at a particular frequency or tuned by an antenna tuner as needed.
> Probably for a wide coverage receiver a long wire antenna is the easiest
> place to start. The longer the better, up to a certain point.
>
> If you are interested in a particular band of frequencies, a dipole works
> well, but tends to be directional - not necessarily a bad thing.
>
> For 28 MHz I've used dipoles that are roughly 5.8 meters on each leg. The
> length varies inversely with the frequency, so at 3 MHz the dipole would
> need to be 58 meters or so. But any piece of wire will work, some will
work
> better than others.
>
> Once I see the photo I'll refine my comments.
>
> Blair
>
> On Sun, 27 Feb 2011 14:57:42 +0100, Inge Hernefjord <
> [log in to unmask]>
> wrote:
>
> Hi, when I left the navy decades ago, I missed my radio equipments.
>> However,
>> I succeded to save one traffic receiver as you can see on the photo (if
>> Steve can give a hand). This machine is of course stonaged and hopelessly
>> behind technology of today, but of nostalgic reasons I would like to give
>> it
>> a try. I've spent some money for service and now the receiver can work.
>>
>> Now, I've little knowhow about aerial antennas for 380 Kc/s to 30 Mc/s. I
>> remember I had a network of copper lines across the destroyer, but know
>> nothing of the design.( Had to be repaired frequently after shooting with
>> the anti-aircraft artillery).
>>
>> So, to the question: Anyone familiar with the GEC 400S? How would a
modern
>> antenna look like and what kind of tuning and compensation is necessary ?
>> I've contacted some DX guys, but they know nothing about this antiquity.
>>
>> Wait for the photos.
>>
>> Inge
>>
>>
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