[RFI] DSL Filter Update

[Jim Brown]

On Sat, 7 Mar 2009 11:29:05 -0800 (PST), Roger Parsons wrote:


>Just to advise the group that a couple of other stations have had 
>success with this filter. Nick, VE3FJ, also checked out its 
>frequency response with the following results:

>1.85MHz   -26dB
>3.65MHz   -46dB
>7.24MHz   -68dB
>14.13MHz  -60dB
>21.0MHz   -56dB
>28.5MHz   -54dB

>Of course in theory the stop band attenuation should continue to 
>increase with frequency, but in practice there will be strays 
>across the filter that will cause a performance drop at higher 
>frequencies.

Roger,

Exactly how was the response measured?  What source and load 
impedances?

73,

Jim K9YC