Topband: [Bulk] Re: 160 GP Choke

[Jim Brown]

On Tue,9/30/2014 6:28 AM, Grant Saviers wrote:
> Would the type 75 material from Fair-Rite, be a better choice for 160 
> & 80 with 5 turns thru the 0.75" id clamp on?

It depends entirely on cost of the component. The peak of the impedance 
of a single core is in the right frequency range, but a single core 
provides only 125 ohms of choking Z. You would need ten to get 1250 
ohms, 40 for 5,000 ohms, my rule of thumb for most transmitting 
applications. That sounds expensive. :) You could wind turns, but you 
would still need a lot, and that would move the resonance down to the 
low end of AM broadcast, where we don't usually need it.

73, Jim K9YC