[Elecraft] FILTER SETTINGS

[Joe Subich, W4TV]

Bill,

The 500 Hz figures were an older set provided by someone else (I
can't recall now - after more than three years).  My subsequent
measurements of four 500 Hz, 5-pole filters show slightly better
performance.  Those measurements average about 490 Hz at -6dB
and around 1500 Hz at -60 dB.

The difference is somewhat better performance for the 500 Hz,
5 pole filter ... around 800 to 850 Hz at -30 dB but the
overall trends (including the lack of a significant difference
between the "250 Hz" and 400 Hz filters) remain intact.

73,

    ... Joe, W4TV


On 2/8/2011 9:23 PM, Bill W4ZV wrote:
>
> I should have mentioned that the 500 Hz Joe measured below was the Elecraft
> 5-pole...not the Inrad 8-pole.
>
> 73,  Bill
>
>
> Joe Subich, W4TV wrote:
>>
>>
>>                   200      250     400      500
>>     -------------------------------------------------
>>      - 6dB      224      370     435      565  Hz
>>      -60dB      896      777     913     1751  Hz
>>       slope     6.22     3.77    4.43    10.98 Hz/dB
>>
>>      -10dB      274      400     470      653  Hz
>>      -20dB      398      475     559      873  Hz
>>      -30dB      522      550     647     1092  Hz
>>      -40dB      647      626     736     1312  Hz
>>      -50dB      771      702     825     1531  Hz
>>
>