Topband: FT1000 MKV Filters

[Jim Brown]

On Fri, 25 Jul 2008 11:24:47 +0100, G3SVL wrote:

>It's not just the filter that matters, its the filter skirt response 
>too. 

YES! As it happens, I recently completed a somewhat extensive series of 
measurements of filters in both my K3 and two FT1000MPs. Most are Inrad 
filters. They can be downloaded as a pdf with the following link. The 
measurement technique uses band noise as a source and does an FFT of the 
audio output. As a result, it shows the cascaded (total) response of the 
IF filters and the audio filters (as well as distortion in the audio 
system, if there is any). The FFT is a high quality pro audio analysis 
system that runs on my PC. 

http://audiosystemsgroup.com/FilterTestNotes.pdf

I did not measure the 125 Hz or 63 Hz audio filters in the MP. Only so 
many hours in the day. :)  

73,

Jim Brown K9YC