[1000mp] INrad Collins vs Yaesu Collins 500 Hz Filter for 1000MPs

[Joe Giacobello]

Whoops!  I misread your reply, Ian.  You're saying to use the 400 Hz 
xtal filter in place of the Collins.  Another post from K4IK indicated 
that the Inrad and Yaesu Collins filters were identical.  I have several 
options here which I will look at.  Thanks to both you and Buck.

73, Joe

Ian White, G3SEK wrote:

> Earl W Cunningham wrote:
>
>>
>> "Has anyone measured or judged any difference in performance between
>> these guys?"
>> ==========
>> The INRAD and the Yaesu Collins 500 Hz mechanical filters are 
>> identical. I recommend the INRAD 400 Hz crystal filter for the 455 
>> kHz I.F. to avoid the broad skirts of the mechanical filter.
>>
>
> The INRAD 400Hz filter makes a dramatic difference to the sub-RX, 
> because that one filter is all the skirt selectivity you have.
>
> I found the Collins filter almost useless in the sub-RX because its 
> skirts are so broad. The much steeper skirts of the INRAD filter 
> really bring the sub-RX to life for CW and RTTY, both as a second RX 
> and for spotting in split pileups.
>
> Imagine you're listening to CW at 700Hz in the center of the passband. 
> Interfering signals at 200Hz and 1200Hz will be at least 30dB weaker 
> through the INRAD filter, and signals further down the skirts are 
> weaker still. Data for both filters are on the INRAD website - but the 
> important thing is that you can *really* hear it!
>
>