Re: [IRCA] Beverage antenna kit

[neilkaz <neilkaz@xxxxxxxxxxxxx>]

Agreed on #73 ferrites for MW. Also the BOG xfmr I made has thicker than extremely flimsy wire and is lots harder to break than a couple of the xfmr's I have obtained over the years. Slowly I am learning how to make my own stuff..... 73 KAZ (5 thumbs on each hand)


-----Original Message-----
>From: Chuck Hutton <charlesh3@xxxxxxx>
>Sent: Sep 7, 2010 8:41 PM
>To: irca@xxxxxxxxxxxxxxxx
>Subject: Re: [IRCA] Beverage antenna kit
>
>
>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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