At 12:23 AM 2/18/2009, you wrote:

>Does anyone know what IF filter Icom is using for DV? Is it an off the
>shelf crystal filter? Maybe 6 or 7 kilohertz wide. They would need a
>15 kilohertz filter to do standard FM. They would have to switch
>between filters? hmm...

Keep in mind that most of the radios these days (including ICOM's D-STAR 
radios) have a "narrow" FM mode, with a corresponding narrow IF filter. I 
suspect that ICOM has that filter do double-duty and handle D-STAR as well.

73,
Gary Kn4AQ



ARVN: Amateur Radio//Video News
Gary Pearce KN4AQ
508 Spencer Crest Ct.
Cary, NC 27513
<mailto:[email protected]>[email protected]
919-380-9944
www.ARVideoNews.com  

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