What have I put my head into! What a jungle, all this stuff about antennas.
I will read and think and decide what to build. A 140' longwire is possible,
but there are so many noisy sources around that I may consider a loop
instead. Or build a phase-out box as was described.
I took my littlel Sony 10 band pocket receiver and walked around to see what
local noise sources could be. Found something I did never know. Tremendous
noise from all stand-by equipments with remote controls. Worst of all was my
new Blue Ray DVD. When I switched it ON, the noise disappeared. Same with my
audio amplifiers and flatscreen TVs. I will check why this is so.
Other noisy things were all switched ACDC supplies. So, my house is full of
noise makers. Not a ideal start for DXing at my low budget level.
Inge
On 2 March 2011 19:58, Bob Landman <[log in to unmask]> wrote:
> Try this design http://www.hamuniverse.com/shortwaveantenna.html
>
> Or buy one of these http://www.dxzone.com/catalog/Antennas/Shortwave/
>
> I have a 1937 Zenith console set (sending Steve a pix) and I have been
> meaning to put up a decent aerial. When the snow leaves, I'm going to have
> a go at it. Let me know what you find works for you.
>
> Bob Landman
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
> Sent: Monday, February 28, 2011 9:33 AM
> To: [log in to unmask]
> Subject: Re: [TN] NTC: GEC BRT 400S
>
> Whatever antenna is used needs to be matched up to the receiver with the
> appropriate jack or connector to get the appropriate impedance match. Inge,
> can you describe the antenna input terminals on your receiver?
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ahne Oosterhof
> Sent: Sunday, February 27, 2011 1:02 PM
> To: [log in to unmask]
> Subject: Re: [TN] NTC: GEC BRT 400S
>
> 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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