While working for (the old) HP we were interviewing for a technician in our
EMC group. I asked him a general question (general, to see where he would
take it) what he thought of ferrites wrt EMC/RFI. His reply, "Ferrites are
our friends". I had quite a grin at a correct answer. He went on to
explain how they are band aids, but get the job done to patch poor design.
Dave - WØLEV
On Sat, May 12, 2018 at 5:53 AM, Mike NA6MB <na6mb.mike@gmail.com> wrote:
> I think I removed the last of the RFI from my station DC (voltage and
> current) monitor system...
> I added:
> 1) one clip on toroid to the current sense, voltage sense and ground wire
> bundle - 2 turns fit in the core.
> 2) a ring toroid to the power cord of my transceiver (removed the 3 clip
> on toroids) - 3 turns fit in the ring.
>
> Mike
> NA6MB
>
>
>
> On 5/4/2018 11:51 AM, David Eckhardt wrote:
>
> Suggest treating every conductor that enters or leaves your charger with a
> large and appropriate core of ferrite material. Choose the ferrite for
> frequencies in the lower HF spectrum. 75 material would be a good choice.
> Take several turns through each core.
>
> Dave - WØLEV
>
> On Fri, May 4, 2018 at 2:41 AM, NA6MB Mike <na6mb.mike@gmail.com> wrote:
>
>> I don’t have much RFI in my shack and it seems like everything is working
>> pretty well.
>>
>> The one thing I have left to fix is that my DC power system which has a
>> power supply that charges the backup battery, the battery powers radios and
>> other stuff and has a monitoring system with a high current shunt and a
>> volt meter.
>>
>> When I transit on 40 and 80 something gets into the battery monitor and
>> it goes crazy, flashes the display, etc. When I stop the transmission it
>> goes back to normal so it’s not damaging the voltmeter.
>>
>> What I want to do is to bypass or filter or someway get rid of the RFI
>> that’s getting into the current reading shunt and or voltmeter of my
>> battery monitoring system.
>>
>> If you have you any insight I would appreciate it.
>>
>> Thank you,
>> Mike
>> NA6MB
>>
>>
>> Sent from my iPad
>> _______________________________________________
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>> RFI@contesting.com
>> http://lists.contesting.com/mailman/listinfo/rfi
>>
>
>
>
> --
>
> *Dave - WØLEV *
> *Just Let Darwin Work*
>
>
> --
> Thanks,
> Mike
> NA6MB
>
>
>
--
*Dave - WØLEV*
*Just Let Darwin Work*
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