[RFI] Keurig coffee vs Astron Rs35M

[Jim Brown]

On 4/10/2014 12:54 PM, Hisashi T Fujinaka wrote:
> On Thu, 10 Apr 2014, Jim Brown wrote:
>
>> On 4/10/2014 10:40 AM, Hisashi T Fujinaka wrote:
>>> The crowbar circuit trips on RF a lot. I've seen this on several
>>> Astrons I own. Lots of ferrite on the leads helps. 
>>
>> What frequencies?  When you say "lots of ferrites," did you wind 
>> turns through them, or just clamp them on?
>
> I've had issues on 40 and 15, and I think on 30. Definitely on 40,
> though with a couple of different radios.
>
> The power line I clamped on several (my supply of ferrite is just Radio
> Shack and those aren't big enough) but I did use several turns on the
> power supply leads near the power supply at first and then near the
> radio as well when I had other issues.

I suggest that you download and study k9yc.com/RFI-Ham.pdf  to 
understand how ferrites work. A single turn (one pass of the wire 
through a ferrite core) is next to useless at HF.

73, Jim K9YC