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 > >> > >> > > --------------------------------------------------- > > Technet Mail List provided as a service by IPC using LISTSERV 15.0 To > > unsubscribe, send a message to [log in to unmask] with following text in > > the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt > > or (re-start) delivery of Technet send e-mail to > > [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing > > per day of all the posts: send e-mail to > > [log in to unmask]: SET Technet Digest > > Search the archives of previous posts at: > > http://listserv.ipc.org/archives Please visit IPC web site > > http://www.ipc.org/ContentPage.aspx?Pageid=E-mail-Forums for > > additional information, or contact Keach Sasamori at [log in to unmask] or > > 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