[RTTY] Icom and Inrad 250Hz Filter

[Kazik]

llindblom@juno.com wrote:
> In my Icom 775 I currently have Icom 500 Hz filters in the 455 KHz and 9 MHz IFs.  I have a chance to pick up an Inrad 250 Hz filter for the 455 KHz IF at a reasonable price.  My question is has anyone used this Inrad filter (Inrad # 122) on RTTY and if so your opinion please.
> 
> TU & 73
> W0ETC   
> 
> 
> 
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I think it is too narrow bandwith for rtty ( with 170 Hz 
shift and 45 Bd). There is a good estimation of filter 
bandwith in :
http://lists.contesting.com/_rtty/2001-September/000845.html

Of course, it is for rtty 23, please change shift for 170 Hz.

kazik
sp6axw