[RFI] Is a low pass filter necessary?

Pete Smith N4ZR n4zr at contesting.com
Fri May 11 05:57:44 PDT 2012

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
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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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