Re: [IRCA] Beverage antenna kit

[Chuck Hutton <charlesh3@xxxxxxx>]

This doesn't look good. He's not using the cores that are best for MW, and his idea of using iron powder cores with 10 - 40 permeability would require hundreds of turns of wire on the biggest cores available. There's no reason to do that - he could use #73 ferrite cores and have a better transformer that is easier to make.
 
His termination resistors would work fine until the day that there is a nearby flash of lightning. See http://www.w8ji.com/beverages.htm and scroll down to "Why Composition Types?" for an explanation. For a DXpedition they would be fine but for a permanent installation, I would not use them.
 
 
Chuck
 
> Date: Tue, 7 Sep 2010 04:34:33 +0000
> From: salmaniw@xxxxxxx
> To: irca@xxxxxxxxxxxxxxxx
> Subject: Re: [IRCA] Beverage antenna kit
> 
> Thanks, Chuck for bringing the technical issues to the forefront.  I emailed the fellow directly, and here's his reply:
> 
> Dear canswl,
> 
> Good evening Gentleman ! 
> I am using binocular ferrite cores for my 
> transformers. The material I use closed to 43 
> material . It has permeability of 850 .That 
> permits me to bild matching trasformers to 
> frequencys 1.7 to 27 MHz. My goal is - to let my 
> customers experiment on a different bands ....
> For MW I would use iron powder toroids with 
> permeability of 10-40 ...I have such toroids but 
> was using them only for 160 meters applications 
> and stoped to do that ... 
> Termination resistors I use are metal film 
> resisotrs . After long experiments I use russian 2 
> watt MLT-2 resistors . These resisotrs has 5 times 
> overload ability and has very small reactive 
> resistance in values range untill 500 OHm - due to 
> their specific construction .. 
> I have adjustable termination resistors as well .
> We just moved to Canada and retuning to the 
> business step-by-step . 4 BV antenna remote 
> switches , bi-derectional BV , EMI coax arrestors 
> , SDR receivers ,preamplfiers and other Low Band 
> DX-ing gear will be available on eBay very soon 
> ...
> You can try it . I sold my gear to almost 40 
> countries ... It's just works .
> Regards ! Alex
> 
> - kafa2500
> 
> Looks like he's very accommodating for our needs.  Being so close, I might just have to pay him a visit sometime and see his line up!  ......Walt
> 
> 
> ----- Original Message -----
> From: Patrick Griffith <antennawizard@xxxxxxxxxxx>
> Date: Monday, September 6, 2010 18:40
> Subject: Re: [IRCA] Beverage antenna kit
> To: IRCA <irca@xxxxxxxxxxxxxxxx>
> 
> > 
> > Very good points Chuck. I have no experience at all with the 
> > Beverage antenna. I have never lived in a place where I could 
> > erect one. I just noticed this kit on e-bay and thought I'd 
> > point it out.
> >   
> > > From: charlesh3@xxxxxxx
> > > To: irca@xxxxxxxxxxxxxxxx
> > > Date: Mon, 6 Sep 2010 17:57:31 +0000
> > > Subject: Re: [IRCA] Beverage antenna kit
> > > 
> > > What I would ask this fellow is what ferrite material he used. 
> > Hams tend to use cores good from 2 - 30 MHZ and they don't work 
> > too well when used for LW and most of MW. A popular ham core is 
> > Amidon type 43, and it certainly is not optimum for LW.
> > > 
> > > And if I am going to pay someone to provide me with a mounted, 
> > enclosed termination resistor I would want to know it is a 
> > carbon composition type, rather than the extremely more 
> > prevalent carbon film resistor which can't take any kind of 
> > energy from a lightning discharge.
> > > 
> > > Maybe his stuff is recommendable for us, and maybe not.
> > > 
> > > 
> >
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