Well
I use a combination of number of type 31 clamp
on type Ferrite’s with also FT-240-31 donut core’s with various turns so your
mileage will vary on your severity of the RFI you are trying to eliminate
and what frequency you are trying to suppress
73
Mike
Sent from my iPhone
> On May 24, 2021, at 12:49 PM, David Hale <astronomerdave@gmail.com> wrote:
>
> Indeed, and I referenced that in my initial email,
>
>> On Thu, May 20, 2021 at 9:28 AM David Hale <astronomerdave@gmail.com> wrote:
>>
>> Or maybe I should follow the guide here http://k9yc.com/ChokesVHF.pdf and
>> include a series of 2T through #31 clamp-ons?
>>
>
> So the plan then I guess would be two 10T for <30MHz and a "few" 2T for
> 50MHz. It's been said here that the inter-winding capacitance of the 10T
> chokes lowers the isolation at 50MHz but does anyone know by *how* much?
> Are the two HF chokes merely "useless" or are they actually "bad" at 6m,
> such that maybe including a 6m antenna along with 10-20m is just a bad idea?
>
> Dave N3WTK
>
> On Mon, May 24, 2021 at 12:10 PM Jim Brown <jim@audiosystemsgroup.com>
> wrote:
>
>> About a year ago, I added recommendations for VHF/UHF
>> k9yc.com/publish.htm
>>
>> 73, Jim K9YC
>>
>>> On 5/24/2021 8:23 AM, David Hale wrote:
>>> Okay, so I gave all the #73 beads to my daughter; maybe she can make
>>> something clever out of them, jewelry or something. I guess I'm still
>>> wondering if I should add a few sets of 2T #31 or if the two 10T #31
>>> (2631803802) chokes don't provide any resistance at 6m. Dave N3WTK
>>>
>>>
>>> On Thu, May 20, 2021 at 9:28 AM David Hale <astronomerdave@gmail.com>
>> wrote:
>>>
>>>>
>>>>
>>> The tables for K9YC's chokes stop at 10m but I wonder if they don't still
>>>> supply some resistive choking impedance at 50MHz.
>>>>
>>>> After doing that I got to thinking, I wonder if leaving the five #73
>> beads
>>>> is maybe good for 6m? Or maybe I should follow the guide here
>>>> http://k9yc.com/ChokesVHF.pdf and include a series of 2T through #31
>>>> clamp-ons? Are the #73 beads detrimental for the other bands?
>>>>
>>>>
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