Hi Wes,
Yes, that is the Fair-Rite bead I am using.
I don't know if 500-600 is enough. If I slip on another 100 beads on each
feedline would I hear a difference?
73,
N2TK, Tony
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Wes
Stewart
Sent: Saturday, January 28, 2017 7:51 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] 4 square for 80
The beads described earlier appear to be Fair-Rite Products P/N 2643800302.
Judging by the chart
http://www.fair-rite.com/product/round-cable-emi-suppression-cores-264380030
2/
the impedance of these at 3.5 MHz is in the neighborhood of 5-6 Ohm. One
hundred of them would be around 500-600 Ohm. Is this enough for the
purpose?
Maybe. Would they be okay at the feedpoint of a dipole? Probably not.
Wes N7WS
On 1/27/2017 8:47 PM, Jim Brown wrote:
> On Fri,1/27/2017 6:32 PM, john@kk9a.com wrote:
>> The only
>> commercial product that I am aware of uses 100 #43 beads:
>> www.dxengineering.com/parts/com-cfc-75
>
> The fact that someone is selling something does not make it a good
> idea, nor does it change the laws of physics. :)
>
> W2DU's string of beads chokes were a good idea because their impedance
> was resistive in the frequency range where they would be used. The
> limitation was (and still is) that the largest bead made with that
> material (#73) is just large enough to fit coax the size of RG58.
>
> 73, Jim K9YC
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