Topband: Ferrite Cores

[Carl]

You should start selling them on here along with those balun cores.

Carl
KM1H


----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: "'TopBand'" <topband at contesting.com>
Sent: Wednesday, August 06, 2014 1:10 PM
Subject: Re: Topband: Ferrite Cores


> On 8/6/2014 8:31 AM, Carl wrote:
>> 31 and 43 mix are the popular ones in the 2-30 MHz range for common 
>> mode suppression; 31 wins at 160 and 80, but 43 is better in the 7-30 
>> range. 
> 
> I would amend that only to say that #31 and #43 are roughly equivalent 
> in the 5-15 MHz, range, #43 is slightly better above 15 MHz.  #43 is a 
> bit less expensive than #31, but the cost difference disappears if you 
> buy #31 in quantity.  My last group purchase of #31 2.4-in cores was for 
> 1,100 pieces, about two years ago. We paid about $4.
> 
> Because #31 is so much better on 80 and 160, because it is more 
> broadband below 15 MHz, and because it remains effective through the HF 
> range, I long ago made the engineering decision to buy #31 in quantity 
> for ham HF applications.  If I were ONLY working above 80M, I would look 
> at pricing on #43 in the quantities I needed.
> 
> 73, Jim K9YC
> 
> 
> 
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