[RFI] Is a low pass filter necessary?

[W0MU Mike Fatchett]

So why is that the K3's problem?  I have 50kw KOA 850 5 miles away and I 
don't have any problems.  What would this have to do with low pass 
filters anyway?

Mike W0MU

W0MU-1 CC Cluster w0mu.net


On 5/10/2012 10:48 PM, Hardy Landskov wrote:
> I have a 22KW BC station about 5.5 miles away from me and it turns the K3
> into Hamburger until Sundown. I talked to N6KR at Visalia and he said I was
> in a minority of people having this problem and putting additional filtering
> on the front end would solve the problem. He is right but my FT1000D never
> did it nor did my FT990. I have looked at the interior and IMHO it's just
> poor grounding. So all that "buckshot" you might be hearing is not you
> towers but the best radio ever made, did not do their homework very
> well.....
> N7RT
>
>
>
> ---- Original Message -----
> From: "Kim Elmore"<cw_de_n5op at sbcglobal.net>
> To:<rfi at contesting.com>
> Sent: Thursday, May 10, 2012 8:52 PM
> Subject: Re: [RFI] Is a low pass filter necessary?
>
>
>> Even though I know that modern rigs don't need one and that modern
>> amplifiers don't need one and that VHF TV is dead as a door nail (or
>> is that coffin nail?), I anachronistically use one. The insertion
>> loss is negligible in my case and it does no harm. Besides, if anyone
>> has the temerity to complain about RFI, I can point at it and say
>> "See? I'm doing my part. Proper filtering. Nothing here is broken!"
>>
>> Kim N5OP
>>
>> At 10:41 PM 5/10/2012, John wrote:
>>> I was on an antennas reflector recently asking about the proper placement
>>> of a low pass filter and several members asked why am I using one at all.
>>> They said with the modern radios (I have an Icom 706 original) a low pass
>>> filter really isn't necessary, that most modern rigs already contain one
>>> and the spurrious emissions are already greatly reduced. So, what is the
>>> opinion of list members-with a modern rig, does having a low pass filter
>>> in
>>> line really help to solve any additional problems?
>>>
>>> John AF5CC
>>> _______________________________________________
>>> RFI mailing list
>>> RFI at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
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