[RTTY] Crystal filter width preferences for RTTY contesting

[Tom Osborne]

HI Jeff

Any 300 cycle filter is good as long as it's 250 cycle :-)  I have an Inrad 
250 cycle filter in my TS-450SAT and I love it for contesting.  Especially 
RTTY.  I have a 500 cycle filter in my Yaesu and it's way, way too wide. 
After listening to the Kenwood, it sounds like the Yaesu doesn't even have a 
filter in it.  73
Tom W7WHY



> Glenn,
>
> Many thanks.
>
> Now that reply - that's what I like.  A man with an unambiguous position! 
> I
> guess you are saying, "any filter is fine, as long as it's 300 hz."  :)
>
> 73/jeff/ac0c
>
>
> --------------------------------------------------
> From: "Glenn Wyant" <va3dx at sympatico.ca>
> Sent: Tuesday, August 25, 2009 12:37 PM
> To: "Jeff Blaine AC0C" <keepwalking188 at yahoo.com>; <rtty at contesting.com>
> Subject: Re: [RTTY] Crystal filter width preferences for RTTY contesting
>
>> 300
>>
>> 300
>>
>> VA3DX
>>
>> ----- Original Message ----- 
>> From: "Jeff Blaine AC0C" <keepwalking188 at yahoo.com>
>> To: <rtty at contesting.com>
>> Sent: Tuesday, August 25, 2009 1:23 PM
>> Subject: [RTTY] Crystal filter width preferences for RTTY contesting
>>
>>
>>> Gentlemen,
>>>
>>> I and a few other guys are working on a project to get a very high
>>> quality
>>> set of crystal filters built for the Yaesu FT2000.  The rig is an
>>> otherwise very fine unit but the front end is a mess.  This project is 
>>> an
>>> attempt to address these short comings.
>>>
>>> And one of the questions that have come up is what the IDEAL width would
>>> be for the RTTY contester.  So I would like to ask your kind option 
>>> here.
>>> Anyone can reply this - while this is about a specific rig, I would like
>>> serious answers from serious operators so we can help to ensure the
>>> filter
>>> guys pick the proper width.
>>>
>>> So the question (in 2 parts) is like this.
>>>
>>> ASSUMPTIONS:  Assume we are not going to rely on the DSP - and that the
>>> width of the DSP is wider than the crystal so it's essentially not being
>>> used for bandwidth limiting.  And assume that the final solution may 
>>> have
>>> 2 filter sockets.  Shape factor of the filters is around 1.5:1 and the
>>> ringing, while present and measurable, is at such low levels as to be
>>> inaudible.
>>>
>>> Q1. If you only were to get 1 filter, what width would it be?
>>>
>>> Q2. If you were to want to fill both filter slots, what widths would
>>> these
>>> 2 filters be?
>>>
>>> Thanks for your comments!
>>>
>>> 73/jeff/ac0c
>>> _______________________________________________
>>> RTTY mailing list
>>> RTTY at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rtty
>>>
>>
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