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Re: [RFI] Is a low pass filter necessary?

To: rfi@contesting.com
Subject: Re: [RFI] Is a low pass filter necessary?
From: Pete Smith N4ZR <n4zr@contesting.com>
Date: Fri, 11 May 2012 08:57:44 -0400
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Back in the day, I believe Drake made two - a cheaper one that rolled 
off between 40 and 50 MHz, and one intended specifically for 6 meters, 
with a sharp roll-off above the band and below Channel 2.

73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at 
reversebeacon.blogspot.com,
spots at telnet.reversebeacon.net, port 7000 and
arcluster.reversebeacon.net, port 7000


On 5/11/2012 8:45 AM, Andy wrote:
>> Perhaps new low-pass filters have a higher corner frequency to
>> accommodate the rash of HF rigs (and now the Elecraft KPA500
>> amplifier) that include 6-meter coverage ...
> I thought the ordinary HF low-pass filters were and still are designed
> for up to HF only, so they don't pass 6 meters which is VHF.  I
> wouldn't expect that to change unless the filter specifically states
> it extends to 6 meters, or 2 meters or 440 (since those two are likely
> to appear on the current rash of modern all-band rigs).
>
> Andy
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