[Amps] Triband balun

[Carl]

As I suggested at the beginning of this thread.

Carl
KM1H


----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: <amps at contesting.com>
Sent: Tuesday, March 18, 2014 3:39 PM
Subject: Re: [Amps] Triband balun


> On 3/18/2014 8:49 AM, Gary Smith wrote:
>> I'm going to try the 10 rolls of coax again, this time alone.
> 
> Contrary to popular mythology, a coil of coax is NOT an effective common 
> mode choke, because it is inductive. An effective common mode choke must 
> have a large value of resistance at the frequency of interest. Only a 
> multiple turns wound through suitable ferrite cores to form a low Q 
> parallel resonant circuit are effective, and a LARGE value of parallel 
> resistance is needed both for power handling and for noise suppression.
> 
> See the "Cookbook" in k9yc.com/RFI-Ham.pdf for specific bands and 
> combinations of bands. 4-5 turns of RG-213-size coax through 5 #31 or 
> #43 Fair-Rite cores covers 20-10M effectively.
> 
> 73, Jim K9YC
> 
> 
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> 
> 
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2014.0.4336 / Virus Database: 3722/7210 - Release Date: 03/18/14
>