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@sympatico.ca>
Sent: Tuesday, August 25, 2009 12:37 PM
To: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; <rtty@contesting.com>
Subject: Re: [RTTY] Crystal filter width preferences for RTTY contesting
> 300
>
> 300
>
> VA3DX
>
> ----- Original Message -----
> From: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>
> To: <rtty@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@contesting.com
>> http://lists.contesting.com/mailman/listinfo/rtty
>>
>
> _______________________________________________
> RTTY mailing list
> RTTY@contesting.com
> http://lists.contesting.com/mailman/listinfo/rtty
>
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|