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

[Joe Giacobello]

Ian, thanks for that inf.  It was extremely useful because I just 
obtained an Inrad Collins filter.

Tnx es 73 de 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!
>
>