I've been trying to divine a defence for this box, but can't.
If I read K9YC's choke cookbook correctly, there's no way this could achieve
the level of broadband choking claimed. Moreover, not only is there no need to
enclose such a device in so expensive an enclosure, it would compromise power
handling. And if you did, how do you mount it at the only place it does any
good?
When it appears the best-performing choke in Jim's cookbook is nothing more
than a frequency-specific number of turns of coax through, at most, $50 in
ferrite cores, with no bulky enclosure, I just can't see why anyone would pay
$900 for this.
Also, if the photo is akin to an "exemplar" piece of furniture, and the box is
built to custom specifications, then the quoted specifications are meaningless
anyway.
BTW, isn't the attenuation noted (called return loss) the only way any choke
actually chokes?
I think Array Solutions has some 'splainin to do!
Then again, PT Barnum has never been proved wrong.
73, kelly, ve4xt
Sent from my iPad
> On Feb 17, 2017, at 12:54 AM, Wes Stewart <wes_n7ws@triconet.org> wrote:
>
> Not defending this at all but... there shouldn't be any, or close to no
> attenuation. It's a short length of high quality coax. Since they claim
> it's built to customer specifications, and they don't quote any, maybe the
> photo shows how it would be built, not an actual balun.
>
>
>> On 2/16/2017 11:16 PM, Bert Almemo wrote:
>> ...and this device (choke) would give you over 30 dB attenuation from 1 to
>> 30 MHz!! I'm definetely missing something!! How can this kind of advertising
>> be allowed? I'm no expert but I've made a few chokes and never managed to
>> accomplish this kind of choking impedance with a couple of turns of coax
>> through a few toroids. Can someone explain please! Thanks
>>
>> Bert, VE3NR
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|