[RFI] Is a low pass filter necessary?

John G. af5cc at fidmail.com
Thu May 10 21:37:26 PDT 2012

That is kind of my thinking as well. I have a Drake LP filter in line right 
now, and not sure what would be gained by removing it.

John AF5CC

----- Original Message ----- 
From: "Kim Elmore" <cw_de_n5op at sbcglobal.net>
To: <rfi at contesting.com>
Sent: Friday, May 11, 2012 3:52 AM
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 
>>line really help to solve any additional problems?
>>John AF5CC
>>RFI mailing list
>>RFI at contesting.com
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