And if a second receiver is not available, perhaps hook the K3 up to a battery
and transport it to another location, as far away as possible from your QTH.
Jim Bennett / W6JHB
Folsom, CA
> On Feb 11, 2016, at 11:44 AM, Bob McGraw K4TAX <rmcg...@blomand.net> wrote:
>
> One other item, if available, try another brand/model radio using the same
> power supply, location, antenna and such. If it is present on that radio,
> most likely it is radiated. If it is not present, then most likely it is
> generated in the K3. {To which that is an entirely different can of worms.}
>
> 73
> Bob, K4TAX
>
>
>
>> On 2/11/2016 12:55 PM, Jon Zaimes wrote:
>> Yes, that is the case. Hearing it on both of my K3 transceivers with only
>> the 12v power cable connected, nothing else (listening on speaker).
>>
>> Thanks to all for the tips. Still absorbing the advice before proceeding.
>>
>> 73/Jon AA1K
>> Felton, Delaware
>> www.aa1k.us
>>
>> -----Original Message-----
>> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Alan
>> Sent: Thursday, February 11, 2016 12:04 PM
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] 12 meter K3 RFI from nearby FM station
>>
>>> On 02/10/2016 03:57 PM, Jim Brown wrote:
>>> Yes, this hit me between the eyes as well. The K3 has Pin One Problems
>>> at many (most?) connectors, so RF current flowing on shields of cables
>>> plugged into those connectors will couple into the K3. I've been
>>> preaching to Wayne about Pin One Problems since 2004, when we met in
>>> Dayton.
>>>
>>> If the problem is around 90 MHz, I'd use multiple one-turn and two
>>> turn chokes with #43 material on every cable except the SO239 output,
>>> which IS actually bonded to the chassis. Also choke the power cable.
>> But it sounds like he was still getting the problem with no cables connected
>> to the K3:
>>
>> On 02/10/2016 06:58 AM, Jon Zaimes wrote:
>> ...
>> > Even when ALL cables are removed (only the power lead connected).
>> > Grounding or ungrounding made no change. I tried the radios on a >
>> battery but still had the RFI. Tried some ferrites on the power > lead but
>> no change.
>>
>> I suppose it could be a "pin 1" problem on the power leads. It's kind of
>> hard to avoid that with an Anderson PowerPole connector. Probably
>> additional low-pass filtering on the DC input would help.
>>
>> Alan N1AL
>>
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