To convert those Mag and Phase values to Complex Impedance (aka Choke
Impedance) you can use next calculator (Excel spreadsheet):
http://www.puertobalsillas.com/radio/Balun_Guanella_4_1/Calculadora_Impedancia_Compleja.xlsx
(It is part of this web site: http://www.ea1ddo.es/medir_balun.php )
73, Maximo
________________________________
De: TowerTalk <[email protected]> en nombre de David Robbins
<[email protected]>
Enviado: jueves, 14 de diciembre de 2017 21:48
Para: [email protected]
Asunto: Re: [TowerTalk] Another way to make a CM choke ?
Ancient reference for aircore baluns:
http://www.k1ttt.net/technote/airbalun.html
David Robbins K1TTT
e-mail: mailto:[email protected]
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
-----Original Message-----
From: TowerTalk [mailto:[email protected]] On Behalf Of David
Gilbert
Sent: Thursday, December 14, 2017 21:12
To: [email protected]
Subject: Re: [TowerTalk] Another way to make a CM choke ?
I'm pretty sure some of the common mode choke approaches do exactly that ...
except using the stray capacitance between the shields of the turns to get the
resonance. I suspect there are websites showing the right configurations
(number and diameter of the turns) necessary for resonance. It's been a while
since I read Jim's paper, but I think he mentions that approach as well.
Dave AB7E
On 12/14/2017 1:32 PM, Jim Thomson wrote:
> Ok, for MONOband use only, what about a simple parallel resonant circuit,
> consisting of a solenoid coil of 50 ohm coax + parallel resonating fixed or
> variable cap, or padding a variable cap ?
> With cap wired between input and output braid. On paper, this appears to be
> a very high Z, and low Q device. And wide enough to cover one ham band in
> question. Is it doable ?
> Whats the optimum L to C ratio for this concept to work ? IE; we would
> want the highest Z practical, but a Q such that the high Z covers an entire
> band, or portion of one band, or freqs of interest.
>
> Jim VE7RF
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