[TowerTalk] What am I missing....balun

[Bert Almemo]

...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

 

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
john at kk9a.com
Sent: Thursday, February 16, 2017 2:59 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] What am I missing....balun

It looks like more turns would be possible in that enclosure.  I am
curious why costs $900.

John KK9A


To:	<towertalk at contesting.com>
Subject:	[TowerTalk] What am I missing....balun
From:	"Jim Thomson" <jim.thom at telus.net>
Date:	Thu, 16 Feb 2017 10:00:51 -0800


What am I missing here ?   Appears to be 2 turns through  6 x type 31 cores.
These are standard 2.4 inch OD cores.   Coax is just  RG-393.   The mess
of caps on the balanced end is to tune out the xl of the threaded brass
material used to go through each insulator.   Rated for 20 kw cw, and 40
kw ssb,
from 1.8  to 30.0 mhz.   12 x 6 x 4 inch nema box.  Box appears to be
aluminum.

I cant fathom how this would have enough Z or RS to be effective on any
band,
maybe
10m.

Jim  VE7RF

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