[RFI] Maintaining 50 Ohms...

[Dave]

Hi Jim,
This is a bleeder question, and my chokes are in boxes that are 
plastic...  I use a pair of FT240/31s.  At no more than 500 watts, into 
a monopole with a decent radial system...  I will be adding the bleeder 
to the choke box, at the feedpoint.  Thanks for the tips on heat!

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 9/18/21 11:22 AM, Jim Brown wrote:
> On 9/18/2021 4:35 AM, Dave wrote:
>> I will build a small chassis and put them on inside, with a pair of 
>> SO-239s.
> 
> I've deleted the original post in this thread. Did it start with a choke 
> with the bleed included? Several thoughts. First, the first choke in any 
> system should be at the antenna feedpoint, not in the shack. Second, for 
> reasons of dissipation, chokes should not be enclosed, or if they are 
> enclosed, must be provided with sufficient ventilation. There's an 
> addition to the Cookbook from NA6O, who did some serious lab work on 
> that, and added it to chokes for the N6RO contesting station.
> 
> Third, if chokes are inside a conductive box with connectors mounted to 
> it, the box will short around the choke.
> 
> 73, Jim K9YC
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